Source:
http://feeds.feedburner.com/integratedmedicine

National Geographic

Fish Glow Green After Genetic Engineering National Geographic A genetically engineered fish that glows green from the inside out is helping illuminate what pollutants do inside the body. Endocrine disruptors are substances found in a wide range of industrial products, including plastics, as well as in many female ... and more »

Source:
http://news.google.com/news?q=genetic-engineering&output=rss

Belfast Telegraph

US biotechnology giant Amgen to invest $200m in Dún Laoghaire, Co Dublin plant ... FinFacts Ireland By Finfacts Team US biotechnology giant Amgen and the Irish Government today announced the start of a $200 million-plus expansion programme in Ireland that is expected to result in the creation of 100 jobs. The Taoiseach, Enda Kenny TD and the Tánaiste ... Amgen to create up to 100 jobs in US$200m expansionSiliconrepublic.com 100 jobs in pipeline as biotech company expands in DublinInsideireland.ie Amgen Announce Major Expansion Of Dun Laoghaire FacilityeGov monitor Irish Times -Belfast Telegraph -thejournal.ie all 84 news articles »

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http://news.google.com/news?q=biotechnology&output=rss

Wall Street Journal

Amgen's First CEO Wall Street Journal Amgen was founded as Applied Molecular Genetics in 1980 with funding from venture capitalists amid a rush to exploit the power of gene splicing. The company worked on several products in its early years, including cloned chicken growth hormone, ... George Rathmann, Founding CEO of Amgen and Icos, Dies at 84Xconomy all 24 news articles »

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http://news.google.com/news?q=molecular-genetics&output=rss

Baltimore Sun

Howard County weddings and engagements Baltimore Sun She graduated from the University of Maryland with a Bachelor of Science in cell biology and molecular genetics in 2007. She is on track to graduate from the University of Maryland School of Pharmacy on May 18 with a doctorate in pharmacy.

Source:
http://news.google.com/news?q=molecular-genetics&output=rss

The $3 billion California stem cell agency, which is moving to engage the biotech industry ever more closely, is proposing a major weakening of the financial disclosure requirements for its board of directors and executives.

The move comes as the agency is also seeking to raise cash from the private sector to continue the state research effort's existence.  CIRM's dimming of transparency runs counter to government trends nationally for more disclosure rather than less, including regulations enacted last year by the NIH.

The proposed changes will be considered next Thursday by the CIRM directors' Governance Subcommittee, which will have public teleconference sites in San Francisco and Irvine and two each in Los Angeles and La Jolla.

Currently CIRM board members and top executives must disclose all their investments and income – in a general way – along with California real property that they hold. Under the changes, disclosures would instead be required only "if the business entity or source of income is of the type to receive grants or other monies from or through the California Institute for Regenerative Medicine." CIRM offered no explanation of what it means by "of the type to receive" funds from the agency.

The proposal further narrows disclosure in connection with income or investments in enterprises that provide facilities or services used by CIRM. With the removal of the requirement for reporting all investments, CIRM's changes also specified disclosure of income and investments connected to business entities (nonprofits are not mentioned) that are engaged in biomedical research or the manufacture of biomedical pharmaceuticals.

The new code would appear to give CIRM directors and executives wide personal latitude in determining what should be disclosed. The current language simply states that "all" investments, etc., must be disclosed. That language originated in the 1974 ballot initiative that created the state disclosure requirements. The initiative's intent was to give the public and interested parties access to key information that would allow them to determine what forces are at work in government and whether conflicts of interests exist – as opposed to simply trusting the assertions of officials without additional substantiation.

The new code also appears to relieve CIRM officials of reporting investment in or income from venture capital or other firms that may be engaged in financing biotech or stem cell enterprises, since the firms do not receive cash from CIRM or engage in biomedical research.

While the code appears to provide more reporting freedom for board members and executives, it also may indirectly impose a burden on them to determine whether any of their investments may involve biomedical research or enterprises that could possibly receive funds from CIRM at some point

Earlier this week, the California Stem Cell Report asked the stem cell agency about such issues. Kevin McCormack, CIRM's new senior director of public communications and patient advocate outreach, replied that the changes were "proposed" by the state Fair Political Practices Commission, which oversees state disclosure laws.

He said the FPPC says agencies "should tailor their disclosure categories to type of work performed by the agency."

McCormack cited as examples the State Board of Education and the state retirement system.

As for the specific changes in CIRM's code, McCormack said,

"Because these are the types of entities that are likely to create potential conflicts of interest, we believe the disclosure categories are appropriate."

McCormack did not comment on whether the proposed code would give board members more reporting latitude or whether it relieve them of reporting investments tied to the financing of biotech or stem cell firms. (The text of his response can be found here.)

The California Stem Cell Report is querying the FPPC concerning its policy regarding disclosure codes. CIRM's new code is expected to go before the the full CIRM board in late May. The changes are subject to review by the FPPC and then must formally go through the state administrative law process during which the public can comment and the code modified before final adoption.

Our take? The proposed changes are not in the best interests of CIRM or the people of California. The absence of transparency and disclosure only breeds suspicious speculation of the worst sort. The agency is already burdened by conflicts of interest that are built in by the ballot measure that created it in 2004. Nearly all of the $1.3 billion that CIRM has handed out has gone to institutions linked to CIRM directors. Weakening disclosure at a time when the biotech industry will become more closely tied to CIRM inevitably raises questions about financial linkages – present and future – between CIRM directors and executives and industry. For the past seven years, CIRM directors and staff have been able to comply with
more complete disclosure. They should continue to do so for the life of the agency, which will expire in less than a decade unless it finds additional sources of cash.

Source:
http://californiastemcellreport.blogspot.com/feeds/posts/default?alt=rss

"In answer to your question, we
are proposing changes to the Conflict of Interest Code based upon
recommendations from the California Fair Political Practices
Commission (FPPC). The Political Reform Act requires state
agencies like CIRM to review their Conflict of Interest Codes every
two years.  The FPPC, which is charged with enforcing the
Political Reform Act, is responsible for reviewing and approving
CIRM's Conflict of Interest Code.  In preparation for this
review, CIRM's counsel met with the FPPC staff who suggested the
proposed amendments which are the subject of the upcoming Governance
Subcommittee meeting.  The proposed amendments to CIRM's
Conflict of Interest Code are consistent with the FPPC's position
that agencies should tailor their disclosure categories to type of
work performed by the agency.  For example, CalPERS's
conflict of interest code requires CalPERS officials to disclose
investments in, and income from, entities that are of the type with
which CalPERS contracts and entities in which funds administered by
CalPERS could be invested.  Likewise, the State Board of
Education requires its members to disclose investments, business
positions, and income from a publisher, manufacturer, or vendor of
instructional materials, or services offered to educational
institutions in the State of California and investments, positions of
management and income from any private school in the State of
California.  Similar to these codes, the FPPC proposed that
CIRM's Code be tailored to the nature of CIRM's work.  Thus,
the FPPC proposed that CIRM require its board members and high-level
employees to disclose investments in, and income from, entities that
are of the type with which CIRM would contract or from which CIRM
could procure goods or services as well as investments in, and income
from, biotech and pharmaceutical companies.  Because these
are the types of entities that are likely to create potential
conflicts of interest, we believe the disclosure categories are
appropriate.  It is important to remember, however, that
this is a preliminary proposal.  CIRM will seek input from
the Governance Subcommittee, the Board, and members of the public
before seeking approval of the amendments."

Source:
http://californiastemcellreport.blogspot.com/feeds/posts/default?alt=rss

When a person suffers a heart attack, scar tissue forms over the damaged areas of the heart, reducing the organs function. However, in a recent study, scientists successfully turned this scar tissue into working heart muscle without the use of stem cells.

Duke University researchers used molecules called microRNAs to convert scar tissue (called fibroblasts) into heart muscle cells in a living mouse, improving the hearts ability to pump blood.

According to the scientists, this process is much simpler than stem cell transplants and has none of the ethical concerns, making it a potential turning point in the science of tissue regeneration.

Right now, theres no good evidence stem cells can do the job, senior author Dr. Victor Dzau, a James B. Duke professor of medicine and chancellor of health affairs at Duke University, told FoxNews.com.

Scientists believe embryonic stem cells are the best to use for tissue regeneration because they are pluripotentmeaning they can become any type of cell in the body. However, Dzau said there have not been enough experiments done to prove how functional the stem cells are in regenerating tissues and whether or not they may form deadly tumors.

Additionally, there are ethical concerns about using cells derived from a human embryo, he said.

Meanwhile, adult stem cells avoid the controversy surrounding embryonic stem cells but have a limited capacity to form other types of cells. The results of using these adult stem cells for tissue regeneration are not as satisfying as one would like, Dzau said.

Rather than stem cells, the new method developed by Dzaus team uses microRNA moleculeswhich typically control gene activityand delivers them into the scar tissue that develops after a heart attack. The microRNAs are able to reprogram, or trick, the scar tissue into becoming heart muscle again instead.

Testing is still in its early stages, but so far, the method appears to be relatively easy, and the data looks very promising, according to the researchers.

Its a much simplified, feasible way of causing regeneration; very easy to use as therapy, Dzau said. With stem cells, you have to take them from the embryo or tissue in the body, grow them in culture, and re-inject themand then there can be technical and biological problems.

Go here to see the original:
Repairing the heart without using stem cells

A startup has set out to create a biobank of stem cell-rich tissues collected during surgery with the idea that customers can use their own stored biomaterials for use in future bone graft procedures and stem cell therapies.

Cleveland-based CellBank Technologies is modeling parts of its business on the cord blood bank industry, but instead of blood, it plans to store stem cells and bone-grafting tissues harvested from patients during knee and hip replacement surgeries.

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The problem with harvesting autologous bone graft tissue is that doing so requires a second painful surgery so doctors can obtain the patients own cells. And that additional surgery is just another opportunity for the patient to develop postoperative pain or other complications. Grafting tissue can be taken from several different body parts, including the iliac crest at the hip.

Other options for bone-graft patients include allograft (human tissue harvested from someone besides the patient), synthetic materials and growth factors, which are substances that stimulate cell growth. Controversy has recently engulfed Medtronics bone growth factor Infuse, with allegations of off-label use that contributed to the company paying $85 million to settle a class-action securities fraud lawsuit.

Autograft, which involves harvesting your own bone-grafting tissue, is the gold standard, but its so hard to get, Uram said.

CellBanks plan is to collect bone, marrow and stem cells that would otherwise be discarded during knee and hip surgeries. CellBank customers would then have access to their grafting materials, a product the company has labeled GoldGraft, for future bone graft surgery. The company would also store patients stem cells for use in future stem cell therapies.

Companies that store stem cells for patients include NeoStem and ViaCord.Uram said shes not aware of any other company today that stores both autograft tissue and stem cells for a patients future use.

Thats the beauty of our offering, she said. Were playing in the stem cell collect-and-store industry, but were giving our customers a way to use that collected tissue before the stem cell industry even takes off, if they need it, through use of bone-grafting tissue. With one collection our products solve multiple health needs.

Read this article:
Biobank aims to collect stem cells and tissues for use in future bone grafts

by JEAN ENERSEN / KING 5 News

KING5.com

Posted on April 27, 2012 at 11:01 PM

A Bellevue doctor is one of only two researchers in the country testing stem cells as an anti-aging treatment.

Working with volunteer patients, Dr. Fredric Stern extracts stem cells with a liposuction-like procedure. The cells are then mixed with a special medium.

"Half is saved cyrogenically for future use and the other half is shipped to the laboratory in Arizona where on that end the stem cells are grown further," Stern said.

The end product goes into a cream called tropoelastin. The hope is that high concentrations of a patient's own stem cells in the cream will boost the skink's ability to repair itself.

If the eye cream proves successful in the eight-week study, the company will also offer a facial cream. Both could be available within a few months.

Stern said he expects the price to be comparable to high-end cosmetic products that typically cost hundreds of dollars.

Stern said the skin treatment is just the beginning. He said wound care is another possible use.

Read more:
Bellevue doctor tests stem-cell cream as anti-aging therapy

There could be a path to a simpler recovery after a heart attack. Duke University Medical Center scientists have discovered a way to turn the scar tissue that forms after cardiac arrest into healthy muscle tissue, which would make a stem cell transplant unnecessary.

To achieve this, researchers introduced microRNA to scar tissue cells in a living mouse. These hardened cells, called fibroblasts, develop as a result of a heart attack, and impede the organ's ability to pump blood. The microRNAs, which are molecules that govern the activity of several genes, were able to manipulate the fibroblasts to transform into cells that looked like cardiomyocytes, which comprise heart muscle.

The results of their study have been published in the journal Circulation Research. While further exploration is required, the find is promising for the millions of people in the U.S. that suffer from heart disease, the leading cause of death in this country. But it has application beyond that. If it works for the heart, theoretically it would help regenerate tissues in the brain, the kidneys, and other organs.

Now that this cell reversal technique has proven successful, researchers plan to test it with larger animals. If it works, they'll try it in humans, and hopefully have a practical application developed within the decade. [Science Dailyvia Reddit]

Read the original here:
Scientists Have Found a Way to Regenerate Muscle Tissue After a Heart Attack [Medicine]

Public release date: 24-Apr-2012 [ | E-mail | Share ]

Contact: Paul Scotti scotti.paul@mayo.edu 904-953-2299 Mayo Clinic

JACKSONVILLE, Fla. A single gene that promotes initial development of the most common form of lung cancer and its lethal metastases has been identified by researchers at Mayo Clinic in Florida. Their study suggests other forms of cancer may also be driven by this gene, matrix metalloproteinase-10 (MMP-10).

The study, published in the journal PLoS ONE on April 24, shows that MMP-10 is a growth factor secreted and then used by cancer stem-like cells to keep themselves vital. These cells then drive lung cancer and its spread, and are notoriously immune to conventional treatment.

The findings raise hope for a possible treatment for non-small cell lung cancer, the leading cause of U.S. cancer deaths. Researchers discovered that by shutting down MMP-10, lung cancer stem cells lose their ability to develop tumors. When the gene is given back to the cells, they can form tumors again.

The power of this gene is extraordinary, says senior investigator Alan Fields, Ph.D., the Monica Flynn Jacoby Professor of Cancer Research within the Department of Cancer Biology at Mayo Clinic in Florida.

"Our data provides evidence that MMP-10 plays a dual role in cancer. It stimulates the growth of cancer stem cells and stimulates their metastatic potential,'' he says. "This helps explain an observation that has been seen in cancer stem cells from many tumor types, namely that cancer stem cells appear to be not only the cells that initiate tumors, but also the cells that give rise to metastases."

Dr. Fields says the findings were unexpected, for several reasons.

The first is that the cancer stem cells express MMP-10 themselves, and use it for their own growth. Most of the known members of the matrix metalloproteinase genes are expressed in the tumor's microenvironment, the cells and tissue that surround a tumor, he says. The enzymes produced by these genes are involved in breaking down the microenvironment that keeps a tumor in place, allowing cancer cells to spread, which is why other genes in this family have been linked to cancer metastasis.

"The fact that a gene like MMP-10, which codes for a matrix metalloproteinase that has been linked to metastasis, is actually required for the growth and maintenance of cancer stem cells is very surprising. One would not have predicted that such a gene would be involved in this process," Dr. Fields says.

More here:
Mayo Clinic identifies gene critical to development and spread of lung cancer

ROCKVILLE, Md., April 25, 2012 /PRNewswire/ --Neuralstem, Inc. (CUR) announced that Karl Johe, PhD, Chairman and Chief Scientific Officer, will present at the Fourth International Spinal Cord Injury Treatments and Trials Symposium, in Xi'an, China on Friday, May 4, at 1:00 PM (http://iscitt.org/iscitt4/). Dr. Johe's talk, entitled "Human spinal cord-derived neural stem cells (HSSC) for treatment of neurological diseases," willreview the readiness of Neuralstem's cells to enter clinical trials in China, as well as provide an overview of the US clinical programs in amyotrophic lateral sclerosis (ALS or Lou Gehrig's disease) and in spinal cord injury. Neuralstem has an ongoing FDA-approved Phase I trial testing the safety of its cells in the treatment of ALS and has submitted an IND (Investigational New Drug) to the FDA to initiate trials with its cells in chronic spinal cord injury. Neuralstem's wholly-owned subsidiary in China, Neuralstem China(Suzhou Neuralstem Biopharmaceutical Company Ltd.), is developing cell therapy treatments for chronic motor disorder from stroke in collaboration with BaYi Brain Hospital in Beijing.

(Logo: http://photos.prnewswire.com/prnh/20061221/DCTH007LOGO )

About Neuralstem

Neuralstem's patented technology enables the ability to produce neural stem cells of the human brain and spinal cord in commercial quantities, and the ability to control the differentiation of these cells constitutively into mature, physiologically relevant human neurons and glia. Neuralstem is in an FDA-approved Phase I safety clinical trial for amyotrophic lateral sclerosis (ALS), often referred to as Lou Gehrig's disease, and has been awarded orphan status designation by the FDA.

In addition to ALS, the company is also targeting major central nervous system conditions with its cell therapy platform, including spinal cord injury, ischemic spastic paraplegia and chronic stroke. The company has submitted an IND (Investigational New Drug) application to the FDA for a Phase I safety trial in chronic spinal cord injury.

Neuralstem also has the ability to generate stable human neural stem cell lines suitable for the systematic screening of large chemical libraries. Through this proprietary screening technology, Neuralstem has discovered and patented compounds that may stimulate the brain's capacity to generate new neurons, possibly reversing the pathologies of some central nervous system conditions. The company has received approval from the FDA to conduct a Phase Ib safety trial evaluating NSI-189, its first small molecule compound, for the treatment of major depressive disorder (MDD). Additional indications could include schizophrenia, Alzheimer's disease and bipolar disorder.

For more information, please visit http://www.neuralstem.com or connect with us on Twitter and Facebook.

Cautionary Statement Regarding Forward Looking Information

This news release may contain forward-looking statements made pursuant to the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. Investors are cautioned that such forward-looking statements in this press release regarding potential applications of Neuralstem's technologies constitute forward-looking statements that involve risks and uncertainties, including, without limitation, risks inherent in the development and commercialization of potential products, uncertainty of clinical trial results or regulatory approvals or clearances, need for future capital, dependence upon collaborators and maintenance of our intellectual property rights. Actual results may differ materially from the results anticipated in these forward-looking statements. Additional information on potential factors that could affect our results and other risks and uncertainties are detailed from time to time in Neuralstem's periodic reports, including the annual report on Form 10-K for the year ended December 31, 2011.

Read more:
Neuralstem Chief Scientific Officer To Present At Spinal Cord Injury Conference In China

Mike Ivey writes on all matters money in the spirit of Capital Times founder William T. Evjue, who believed that the concentration of wealth in the U.S. is not healthy for the Democracy.

When UW-Madison's James Thomson in 1998 became the first scientist to grow human embryonic stem cells in a lab, it generated tremendous excitement about the medical possibilities.

Thomson tried to downplay the breakthrough but talk spread about cures for Alzheimers or Parkinsons disease, growing livers for cirrhosis suffers or producing healthy heart cells for cardiac patients.

The miracle cures have been slow in coming, however. Scientists can replicate healthy nerve cells in a Petri dish but havent found a way to replace defective spinal cells in ALS victims, for example.

In many ways, were still at the first steps,Anita Bhattacharyya, a senior scientist in the stem cell program at the UW's Waisman Center, told a business group Tuesday.

Butproducing stem cells for others to use is proving one of Madisons more promising new business ventures. Pharmaceutical companies in particular are using stem cells to test drugs before launching into expensive further testing.

Were making these cells available to the masses, says Chris Parker, chief technology officer at Cellular Dynamics International.

Launched by Thomson -- and backed with $100 million from a local investor group -- Cellular Dynamics International was lauded recently by MIT as one of the 50 most important companies in the world

Since its founding in 2005, the company now counts 107 employees at it offices in University Research Park and is continuing to grow.

Im hiring right now, Parker joked toa lunch crowd of the Wisconsin Technology Council Tuesday.

Read this article:
Biz Beat: Making stem cells "available to the masses"

ScienceDaily (Apr. 24, 2012) Although people generally talk about cancer, it is clear that the disease occurs in a bewildering variety of forms. Even single groups of cancers, such as those of the white blood cells, may show widely differing properties. How do the various cancers arise and what factors determine their progression? Clues to these two issues, at least for leukemias, have now been provided by Boris Kovacic and colleagues at the University of Veterinary Medicine, Vienna (Vetmeduni Vienna). The results are published in the current issue of the journal EMBO Molecular Medicine and have extremely important consequences for the treatment of a particularly aggressive type of leukemia.

It is well known that many types of cancer arise as a result of a mutation within a cell and prevailing wisdom has held that the stage of differentiation of this cell determines exactly what form of cancer develops. For example, it was believed that so-called chronic myeloid leukemia or CML arises from bone marrow stem cells, while a different type of leukemia, known as B-cell acute lymphoid leukemia or B-ALL, results from B-cell precursors. This belief has been spectacularly refuted by the latest results from Boris Kovacic and colleagues in the Vetmeduni Viennas institutes of Animal Breeding and Genetics and of Pharmacology and Toxicology.

The researchers have now shown that both CML and B-ALL arise from the most primordial kind of blood cell (long-term haematopoietic stem cells), although the pathways by which the diseases progress are different. The usual causes of CML and B-ALL are two highly related versions of the same oncogene, BCR/ABL. If the primordial blood cells are transformed or made potentially cancerous by a particular version of BCR/ABL, for technical reasons termed BCR/ABLp210, the result is chronic myeloid leukemia or CML. The long-term haematopoietic stem cells remain and act as the dreaded cancer stem cells, or CSCs, which ensure that the disease persists. Curing chronic myeloid leukemia requires the complete elimination of the CSCs. However, if the long-term haematopoietic stem cells are transformed by a related version of BCR/ABL, BCR/ABLp185, the result is a highly aggressive form of leukemia, B-ALL. The finding that B-ALL actually originates from the same stem cells as CML was both unexpected and highly provocative.

Kovacic and colleagues have shown further that B-ALL only develops if the transformed stem cell is exposed to a particular growth factor, interleukin-7. If interleukin-7 is present (it usually is), the transformed long-term haematopoietic stem cells undergo a differentiation step to CSCs, which in this case correspond to pro-B cells. If interleukin-7 is absent during the initial phase of transformation, B-ALL cannot develop.

In other words, two distinct types of cell are involved in leukemia development, the primordial cells (also termed the cells of origin of cancer) and the cancer stem cells that cause the disease to progress. Unless the CSCs are eliminated, fresh cancer cells can arise at any time and the leukemia will recur. The problem is that current leukemia therapies are not designed to target CSCs. The primordial CSCs in CML are highly quiescent and thus difficult to target. In contrast, the CSCs in B-ALL are abundant and have a high turnover rate, which makes them susceptible to treatment. Treatment of B-ALL may thus succeed in eliminating most CSCs but if even a single cell remains intact it is likely that the patient will relapse, possibly with an even more aggressive form of leukemia. A therapy that targets the bulk of tumour cells will not work, as Kovacic succinctly summarizes his results. To treat B-ALL successfully it will be necessary for us to learn much more about the development of the disease. A combined therapy is required, so future work should aim at developing drugs that target the long-term haematopoietic stem cells from which B-ALL is derived.

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The above story is reprinted from materials provided by Veterinrmedizinische Universitt Wien, via AlphaGalileo.

Note: Materials may be edited for content and length. For further information, please contact the source cited above.

Originally posted here:
Leukemia cells have a remembrance of things past

Public release date: 24-Apr-2012 [ | E-mail | Share ]

Contact: Dr Boris Kovacic Boris.Kovacic@vetmeduni.ac.at 43-125-077-5622 University of Veterinary Medicine -- Vienna

Although people generally talk about "cancer", it is clear that the disease occurs in a bewildering variety of forms. Even single groups of cancers, such as those of the white blood cells, may show widely differing properties. How do the various cancers arise and what factors determine their progression? Clues to these two issues, at least for leukaemias, have now been provided by Boris Kovacic and colleagues at the University of Veterinary Medicine, Vienna (Vetmeduni Vienna). The results are published in the current issue of the journal EMBO Molecular Medicine and have extremely important consequences for the treatment of a particularly aggressive type of leukaemia.

It is well known that many types of cancer arise as a result of a mutation within a cell and prevailing wisdom has held that the stage of differentiation of this cell determines exactly what form of cancer develops. For example, it was believed that so-called chronic myeloid leukaemia or CML arises from bone marrow stem cells, while a different type of leukaemia, known as B-cell acute lymphoid leukaemia or B-ALL, results from B-cell precursors. This belief has been spectacularly refuted by the latest results from Boris Kovacic and colleagues in the Vetmeduni Vienna's institutes of Animal Breeding and Genetics and of Pharmacology and Toxicology.

The researchers have now shown that both CML and B-ALL arise from the most primordial kind of blood cell (long-term haematopoietic stem cells), although the pathways by which the diseases progress are different. The usual causes of CML and B-ALL are two highly related versions of the same oncogene, BCR/ABL. If the primordial blood cells are transformed or made potentially cancerous by a particular version of BCR/ABL, for technical reasons termed BCR/ABLp210, the result is chronic myeloid leukaemia or CML. The long-term haematopoietic stem cells remain and act as the dreaded cancer stem cells, or CSCs, which ensure that the disease persists. Curing chronic myeloid leukaemia requires the complete elimination of the CSCs. However, if the long-term haematopoietic stem cells are transformed by a related version of BCR/ABL, BCR/ABLp185, the result is a highly aggressive form of leukaemia, B-ALL. The finding that B-ALL actually originates from the same stem cells as CML was both unexpected and highly provocative.

Kovacic and colleagues have shown further that B-ALL only develops if the transformed stem cell is exposed to a particular growth factor, interleukin-7. If interleukin-7 is present (it usually is), the transformed long-term haematopoietic stem cells undergo a differentiation step to CSCs, which in this case correspond to pro-B cells. If interleukin-7 is absent during the initial phase of transformation, B-ALL cannot develop.

In other words, two distinct types of cell are involved in leukaemia development, the primordial cells (also termed the cells of origin of cancer) and the cancer stem cells that cause the disease to progress. Unless the CSCs are eliminated, fresh cancer cells can arise at any time and the leukaemia will recur. The problem is that current leukaemia therapies are not designed to target CSCs. The primordial CSCs in CML are highly quiescent and thus difficult to target. In contrast, the CSCs in B-ALL are abundant and have a high turnover rate, which makes them susceptible to treatment. Treatment of B-ALL may thus succeed in eliminating most CSCs but if even a single cell remains intact it is likely that the patient will relapse, possibly with an even more aggressive form of leukaemia. "A therapy that targets the bulk of tumour cells will not work," as Kovacic succinctly summarizes his results. "To treat B-ALL successfully it will be necessary for us to learn much more about the development of the disease. A combined therapy is required, so future work should aim at developing drugs that target the long-term haematopoietic stem cells from which B-ALL is derived."

###

The paper "Diverging fates of cells of origin in acute and chronic leukemia" by Boris Kovacic, Andrea Hoelbl, Gabriele Litos, Memetcan Alacakaptan, Christian Schuster, Katrin M. Fischhuber, Marc A. Kerenyi, Gabriele Stengl, Richard Moriggl, Veronika Sexl and the late Hartmut Beug is published in the current issue of the journal "EMBO Molecular Medicine" (2012, Vol. 4 pp. 283-297).

The work was initiated at the Research Institute of Molecular Pathology (IMP) and was performed together with groups at the Medical University of Vienna and the Ludwig Boltzmann Institute for Cancer Research in Vienna.

Originally posted here:
Leukaemia cells have a remembrance of things past

A previously hairless mouse following an implantation of bioengineered hair follicles recreated from adult tissue-derived stem cells

Researchers lead by Professor Takashi Tsuji from the Tokyo University of Science have successfully induced the natural hair growth and loss cycle in previously hairless mice. They have achieved this feat through the implantation of bioengineered hair follicles recreated from adult-tissue derived stem cells. While these results offer new hope for curing baldness, the work has broader implications, demonstrating the potential of using adult somatic stem cells for the bioengineering of organs for regenerative therapies.

The method devised by Professor Tsujis team involves reconstructing hair follicle germs from adult epithelial stem cells and cultured dermal papilla cells (dermal papilla are nipple-like projections at the base of hairs) and implanting these germs within or between skin layers. To recreate the desired hair densities normally about 120 hair shafts per square centimeter (0.15 square inch) or 60-100 hair shafts per square centimeter following a conventional hair transplantation method 28 bioengineered follicle germs were transplanted onto a circular patch of cervical skin measuring 1 cm (0.39 in) in diameter. The resulting hair density of 124 hair shafts per square centimeter (plus or minus 17 shafts) turned out to be satisfactory, but there was more good news.

Far more importantly, the implanted follicle germs developed all the proper structures and formed correct connections with the surrounding host tissues, including epidermis, arrector pili muscle and nerve fibers. Also, the stem and progenitor cells along with their niches were recreated in the bioengineered follicles, making a continuous hair-growth cycle possible.

The method has been shown to work with all types of hair follicles, regardless of function, structure and color (depending on the type of the origin follicle). In fact, some features of the hair shaft, such as pigmentation, may be controlled fancy a new permanent hair color?

Although more research is still necessary (such as further study of stem cell niches and optimizing the way origin follicles are to be sourced for clinical applications), the study constitutes another milestone on the way to next generation regenerative therapies.

Source: Tokyo University of Science

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Adult stem cells used to induce the natural hair growth cycle in hairless mice

SOUTH SAN FRANCISCO, CA--(Marketwire -04/25/12)- VistaGen Therapeutics, Inc. (VSTA.OB - News) (VSTA.OB - News), a biotechnology company applying stem cell technology for drug rescue, has secured a new United States patent covering the company's proprietary methods used to measure and type the toxic effects produced by drug compounds in liver stem cells.

Test methods included in this new patent, (U.S. Patent 11/445,733), titled "Toxicity Typing Using Liver Stem Cells," cover all mammalian liver stem cells -- rat and mouse cells, for example, in addition to human cells. Liver stem cells used in drug testing can be derived from in vivo tissue or produced from embryonic stem cells (ES) or induced pluripotent stem cells (iPS).

H. Ralph Snodgrass, Ph.D., VistaGen's President and Chief Scientific Officer, said, "This patent covers the monitoring of changes in gene expression as an assay for predicting drug toxicities. It is well known that drugs activate and suppress specific genes, and that the changes in gene expression reflect the mechanism of drug toxicities. The specific sets of genes that are affected become a profile of that drug."

VistaGen's new patent also covers techniques used to develop a database of gene expression profiles of drugs that have the same type of liver toxicity. Using sophisticated "pattern matching" database tools, drug developers can analyze these related profiles to determine "gene expression signatures" that are common and predictive of drugs that produce specific types of toxicity.

"Without this database capability, a drug's single gene expression profile could not be interpreted," Dr. Snodgrass added. "The ability to use liver stem cells to differentiate drug-dependent gene expression profiles, and to compare those profiles of drugs known to induce toxic liver effects, provides a powerful tool for predicting liver toxicity of new drug candidates, including drug rescue variants."

Shawn K. Singh, VistaGen's Chief Executive Officer, stated, "Strong and enforceable intellectual property rights are critical components of our plan to optimize the commercial potential of our Human Clinical Trials in a Test Tube platform. This new liver toxicity typing patent further solidifies our growing IP portfolio, and supports the continuing development of LiverSafe 3D, our human liver cell-based bioassay system, which complements our CardioSafe 3D human heart cell-based bioassay system for heart toxicity."

About VistaGen Therapeutics

VistaGen is a biotechnology company applying human pluripotent stem cell technology for drug rescue and cell therapy. VistaGen's drug rescue activities combine its human pluripotent stem cell technology platform, Human Clinical Trials in a Test Tube, with modern medicinal chemistry to generate new chemical variants (Drug Rescue Variants) of once-promising small-molecule drug candidates. These are drug candidates discontinued due to heart toxicity after substantial development by pharmaceutical companies, the U.S. National Institutes of Health (NIH) or university laboratories. VistaGen uses its pluripotent stem cell technology to generate early indications, or predictions, of how humans will ultimately respond to new drug candidates before they are ever tested in humans, bringing human biology to the front end of the drug development process.

Additionally, VistaGen's small molecule drug candidate, AV-101, is in Phase 1b development for treatment of neuropathic pain. Neuropathic pain, a serious and chronic condition causing pain after an injury or disease of the peripheral or central nervous system, affects approximately 1.8 million people in the U.S. alone. VistaGen is also exploring opportunities to leverage its current Phase 1 clinical program to enable additional Phase 2 clinical studies of AV-101 for epilepsy, Parkinson's disease and depression. To date, VistaGen has been awarded over $8.5 million from the NIH for development of AV-101.

Visit VistaGen at http://www.VistaGen.com, follow VistaGen at http://www.twitter.com/VistaGen or view VistaGen's Facebook page at http://www.facebook.com/VistaGen

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VistaGen Secures Key U.S. Patent Covering Stem Cell Technology Methods Used to Test Drug Candidates for Liver Toxicity

Public release date: 25-Apr-2012 [ | E-mail | Share ]

Contact: Kim Irwin kirwin@mednet.ucla.edu 310-206-2805 University of California - Los Angeles Health Sciences

Can one feel too attached? Does one need to let go to mature? Neural stem cells have this problem, too.

As immature cells, neural stem cells must stick together in a protected environment called a niche in order to divide so they can make all of the cells that populate the nervous system. But when it's time to mature, or differentiate, the neural stem cells must stop dividing, detach from their neighbors and migrate to where they are needed to form the circuits necessary for humans to think, feel and interact with the world.

Now, stem cell researchers at UCLA have identified new components of the genetic pathway that controls the adhesive properties and proliferation of neural stem cells and the formation of neurons in early development.

The finding by scientists at the Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research at UCLA could be important because errors in this pathway can lead to a variety of birth defects that affect the structure of the nervous system, as well as more subtle changes that impair cognitive and motor functions associated with disorders such as autism.

The results of the four-year study are published April 26, 2012 in the peer-reviewed journal Neuron.

The UCLA team found that a delicate balance of gene expression enables the pool of neural stem and progenitor cells in early development to initially increase and then quickly stop dividing to form neurons at defined times.

"One of the greatest mysteries in developmental biology is what constitutes the switch between stem cell proliferation and differentiation. In our studies of the formation of motor neurons, the cells that are essential for movement, we were able to uncover what controls the early expansion of neural stem and progenitor cells, and more importantly what stops their proliferation when there are enough precursors built up," said Bennett G. Novitch, an assistant professor of neurobiology, a Broad Stem Cell Research Center scientist and senior author of the study. "If the neurons don't form at the proper time, it could lead to deficits in their numbers and to catastrophic, potentially fatal neurological defects."

During the first trimester of development, the neural stem and progenitor cells form a niche, or safe zone, within the nervous system. The neural stem and precursor cells adhere to each other in a way that allows them to expand their numbers and keep from differentiating. A protein called N-cadherin facilitates this adhesion, Novitch said.

See more here:
Growing up as a neural stem cell: The importance of clinging together and then letting go

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