Category Archives: Stem Cells

By Robert Preidt

HealthDay Reporter

MONDAY, Nov. 24, 2014 (HealthDay News) -- Researchers have discovered the stem cells that allow your nails to grow back after you lose them.

Using mouse nail cells, University of Southern California scientists identified stem cells that can perform two roles. In normal conditions, the stem cells assist in the growth of both the nails and nearby skin. However, if a nail is damaged or destroyed, the stem cells focus exclusively on nail repair, according to the study.

"That was a very surprising discovery, since the dual characteristic of these nail stem cells to regenerate both the nail and skin under certain physiological conditions is quite unique and different from other skin stem cells, such as those of the hair follicle or sweat gland," principal investigator Krzysztof Kobielak said in a university news release.

The researchers wonder if it might be possible to get these nail stem cells to produce other types of tissue. If so, it could lead to new ways to help people with everything from nail and finger defects to severe skin injuries and amputations.

Findings from the study were published online recently in the Proceedings of the National Academy of Sciences.

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Researchers Find Stem Cells That Help Nails Regenerate

Dr John Sinden, left, and Olav Helleb of Reneuron. Photograph: Linda Nylind for the Guardian

He wants to bore ahole in your head. But dont panic, Olav Helleb is not a modern-day trepanist and it will be a top-notch surgeon, not the 49-year-old Norwegian businessman, holding the drill.

Drilling holes in the skull sounds drastic. But Helleb says it is worth it; the procedure, coupled with injections of stem cells, from his British biotech company Reneuron, could help heal victims of debilitating strokes, he says.

Its a routine thing but it does sound pretty scary to me, Helleb says of cranial drilling. You only do it if you think it is going to make a significant difference to the patient. You set the bar pretty high, its not an antihistamine pill.

The treatment isnt pills but millions of stem cells undifferentiated cells that can be encouraged to grow into all kinds of human cells. Helleb says the cells injected into patients brains can be encouraged to regenerate neurons lost in a stroke.

The field is regenerative medicine, which in a word tells you it is about regenerating cells which are missing or damaged in some way. So in a way it is a cure, he said. Reneuron is re-growing neurons in the brain. The idea is that we can somehow spur the regrowth of those neurons so we can improve the outcomes of strokes.

The treatment, first developed by John Sinden, in a Kings College London laboratory 15 years ago, has passed phase-one trials and the firm has begun phase-two clinical trials with 41 patients.

Helleb, an experienced biotech executive who previously commuted from his Hampstead home to Oslo while head of the Norwegian firm Clavis Pharma, was brought in by Reneurons directors this autumn to drive the firm and its technology from the lab bench into hospitals.

He believes that if the procedure is successful it could give hundreds of thousands of stroke patients their lives back, and save billions for the NHS and other countries healthcare budgets.

At present, he says, stroke patients typically improve for a few weeks, but then stop progressing. Our plan is to treat the patient after a month, maybe two, and kickstart that healing process again, he said. It can have a huge impact. It can make the difference between having a full-time carer helping you with everything to being able to function by yourself.

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Opening minds: the biotech company aiming to change stroke victims lives

preservation laboratory, where stem cells were kept for use in transplants in children whose bone marrow has been damaged during chemotherapy.

Concerns were first raised when Sophie Ryan-Palmer, 12, who had acute lymphoblastic leukaemia, failed to make progress after her transplant in June 2013, which involved using a donors stem cells rather than her own.

She had been diagnosed with leukaemia at the age of two and had undergone three previous transplants. She began fundraising for cancer charities when she was six.

By October last year the hospital had identified that a higher than usual proportion of eight children who had undergone stem cell transplantation between March and August had suffered what doctors call delayed engraftment. But by the time it stopped freezing stem cells on site at its base in Bloomsbury, central London, and launched an investigation, three of the eight had died.

Ryan Loughran, aged 13 months, from Bournemouth, died on July 10. Sophie, from Sunbury in Middlesex, followed on July 17. Katie Joyce, from Hertfordshire, died on October 6. A fourth patient, Muhanna al-Hayany, aged five, died in August this year. He had come from Kuwait to have the treatment. Following the deaths it was discovered that the method used to freeze the stem cells had inexplicably stopped working and that, although still alive, the cells were unable to mature properly.

At the inquest, Katie Beattie, the barrister representing Katie Joyces family, questioned whether the girls transplant in August should have been suspended, knowing Sophie and Ryan had died the previous month. Great Ormond Street went ahead even though there was plenty of time to stop it, she said.

Doctors from the hospital told St Pancras coroners court that they regretted not halting transplants sooner and Katies life might have been saved if they had. But they said they believed they were doing the right thing by continuing with the transplants because cancer doesnt wait.

Great Ormond Street said it has since overhauled its procedures to prevent further incidents, but is still investigating why the freezing process stopped working.

A spokesman said: Before giving our patients any frozen cells we carried out tests, which are standard across most laboratories in the UK, to ensure they were alive and viable. All of the samples passed these tests, so there was nothing to suggest there was a problem at this stage.

The coroner, Mary Hassell, is expected to deliver verdicts on all four deaths on Tuesday.

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Stem cell failure 'led to children's deaths' at Great Ormond Street

PUBLIC RELEASE DATE:

20-Nov-2014

Contact: Cristy Lytal lytal@med.usc.edu 323-442-2172 University of Southern California - Health Sciences

There are plenty of body parts that don't grow back when you lose them. Nails are an exception, and a new study published in the Proceedings of the National Academy of Sciences (PNAS) reveals some of the reasons why.

A team of USC Stem Cell researchers led by principal investigator Krzysztof Kobielak and co-first authors Yvonne Leung and Eve Kandyba has identified a new population of nail stem cells, which have the ability to either self-renew or undergo specialization or differentiation into multiple tissues.

To find these elusive stem cells, the team used a sophisticated system to attach fluorescent proteins and other visible "labels" to mouse nail cells. Many of these cells repeatedly divided, diluting the fluorescence and labels among their increasingly dim progeny. However, a few cells located in the soft tissue attached to the base of the nail retained strong fluorescence and labels because they either did not divide or divided slowly -- a known property of many stem cells.

The researchers then discovered that these slow-dividing stem cells have the flexibility to perform dual roles. Under normal circumstances, the stem cells contribute to the growth of both the nails and the adjacent skin. However, if the nail is injured or lost, a protein called "Bone Morphogenic Protein," or BMP, signals to the stem cells to shift their function exclusively to nail repair.

The researchers are now wondering whether or not the right signals or environmental cues could induce these nail stem cells to generate additional types of tissue -- potentially aiding in the repair of everything from nail and finger defects to severe skin injuries and amputations.

"That was very surprising discovery, since the dual characteristic of these nail stem cells to regenerate both the nail and skin under certain physiological conditions is quite unique and different from other skin stem cells, such as those of the hair follicle or sweat gland," said Kobielak.

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Nail stem cells prove more versatile than press ons

Researchers of CEU Cardenal Herrera University (CEU-UCH) for the first time transplanted bone marrow stem cells into damaged brain tissue while applying lipoic acid (a potent antioxidant), with the aim of improving neuroregeneration in the tissue. This new way of repairing brain damage, which combines cellular treatment with drug therapy, has shown positive results, especially in forming blood vessels (a process called angiogenesis) in damaged areas of the brains of adult laboratory mice. Angiogenesis is a process that is essential to the recovery of damaged neural tissues. The investigation was led by Jos Miguel Soria Lpez, deputy director of the Institute of Biomedical Sciences at CEU-UCH, and its results were published in the international medical journal Brain Injury.

Professor Soria, who is affiliated to the Department of Biomedical Sciences at CEU-UCH, heads the investigative group 'Strategies in Neuroprotection and Neuroreparation', which carried out the investigation in cooperation with the Andalusian Molecular Biology and Regenerative Medicine Centre (CABIMER), located in Sevilla, and the Mediterranean Ophthalmological Foundation, located in Valencia. The research team used the experience they obtained from their previous investigations on the neuroregenerative efficiency of lipoic acid to develop a new remediation strategy for patients of brain damage. This new therapy combines the transplantation of bone marrow stem cells into the brain -- in this case, the brains of adult rats -- with the administration of the potent antioxidant lipoic acid.

Lipoic acid is already used in the treatment of degenerative diseases such as multiple sclerosis or diabetic neuropathy. Professor Soria concluded from previous researches he conducted at CEU-UCH that it has the ability to increase the creation of blood vessels, which speeds up cerebral immune response after an injury and stimulates the restoration of damaged tissues. Several other researches, for their part, proved that after brain damage stem cell therapies using a patient's own bone marrow induce functional improvements. The two therapies -- one cellular; the other one pharmacological -- were both applied in this research so as to evaluate their combined effect.

New blood vessels

Angiogenesis -- the process that forms new blood vessels -- in the treated neuronal tissue began only eight days after the application of this new, combined therapy. CEU-UCH professor Soria says that "although bone marrow stem cells disappear from the brain tissue where they were transplanted after only 16 days, new cells keep forming. To put it another way, brain tissue is regenerated by new cells that appear in the brain as a result of stem cell transplantation. This proves the regenerative efficiency of the new combined therapy."

The research also shows how the blood vessels that formed after the treatment grow into the damaged area of the brain. "They act as a kind of scaffolding to that area that allows microglia cells to migrate," professor Soria says. "In the damaged area, they contribute to regeneration." He adds that "the application of both treatments results into high angiogenic activity, which is crucial for an efficient recovery of the damaged brain area." According to Soria, "the laboratory mice that recovered fastest from brain injuries were those that had a higher density of regenerated blood vessels."

Taking into consideration brain damage is, especially among children and adolescents, one of the leading causes of disability and death in the developed world, the good results that were obtained from the combination of the two therapies make the research team very hopeful. "Combining an antioxidant such as lipoic acid with bone marrow stem cells has proven to be an effective remedy," Soria observes. The team plans to conduct future research into similar combined therapies.

The image above shows the transplant of bone marrow stem cells from transgenic mice under the effects of cerebral cortex after suffering local brain damage. Also visible is a neuroprotective drug therapy.

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The above story is based on materials provided by Asociacin RUVID. Note: Materials may be edited for content and length.

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Brain injuries in mice treated using bone marrow stem cells, antioxidants

Katie Joyce, left, aged four, and Sophie Ryan Palmer, aged 12, were among the four children who died as a result of complications with transplants. Photograph: Steve Parsons/PA

Four children have died after failings in how stem cells used in life-saving operations were frozen at Great Ormond Street hospital, it emerged this week.

The four, who were between one and 12 years old, were among eight children with cancer whose bone marrow transplants did not work as a result of problems with the freezing process.

Britains best-known childrens hospital has admitted that one of them, four-year-old Katie Joyce, might have survived if it had acted more quickly when problems arose.

An inquest into the deaths this week heard that doctors were initially baffled as to why a decade of success using the procedures suddenly came to a halt in summer 2013. Despite extensive investigations, the hospital failed to pinpoint the source of the setbacks in its cryopreservation laboratory, used for freezing stem cells which were kept there for using in bone marrow transplants in children.

The transplanted stem cells were intended to help the childs bone marrow, damaged during chemotherapy, grow again to maximise the chance of recovery.

At the inquest, lawyers for two of the families whose children died accused Great Ormond Street of taking too long to halt the transplants once staff began having concerns.

The hospital has since overhauled its procedures to prevent further incidents and there are calls for the deaths to lead to tighter procedures around how stem cells are stored at hospitals and research centres across the UK.

Concerns were first raised in June 2013 when 12-year-old Sophie Ryan Palmer, who had acute lymphoblastic leukaemia, failed to make progress after her transplant at Great Ormond Street, which involved using a donors stem cells rather than her own.

By October 2013 the hospital had identified that a higher than usual proportion of eight patients who had undergone stem cell transplantation between March and August had suffered setbacks after encountering what doctors call delayed engraftment. It immediately stopped freezing stem cells on site at its base in Bloomsbury, central London, and launched an investigation.

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Great Ormond Street deaths caused by stem cell lab failures, inquest told

CLEVELAND -

Our bodies contain 23 pairs of them, 46 total, but if chromosomes are damaged, they can cause birth defects, disabilities, growth problems, even death.

Case Western Reserve University scientist Anthony Wynshaw-Boris is studying how to repair damaged chromosomes with the help of a recent discovery. He's taking skin cells and reprogramming them to work like embryonic stem cells, which can grow into different cell types.

"You're taking adult or a child's skin cells. You're not causing any loss of an embryo, and you're taking those skin cells to make a stem cell," said Wynshaw-Boris.

Scientists studied patients with a specific defective chromosome that was shaped like a ring. They took the patients' skin cells and reprogrammed them into embryonic-like cells in the lab. They found this process caused the damaged "ring" chromosomes to be replaced by normal chromosomes.

"It at least raises the possibility that ring chromosomes will be lost in stem cells," said Wynshaw-Boris.

While this research was only conducted in lab cultures on the rare ring-shaped chromosomes, scientists hope it will work in patients with common abnormalities like Down syndrome.

"What we're hoping happens is we might be able to use, modify, what we did, to rescue cell lines from any patient that has any severe chromosome defect," Wynshaw-Boris explained.

It's research that could one day repair faulty chromosomes and stop genetic diseases in their tracks.

The reprogramming technique that transforms skin cells to stem cells was so groundbreaking that a Japanese physician won the Nobel Prize in medicine in 2012 for developing it.

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Health Beat: Stem cells to repair broken chromosomes

Durham, NC (PRWEB) November 20, 2014

With more soldiers returning from combat suffering devastating injuries, doctors are turning to a reconstructive surgery that uses tissue transplantation along with immuno-suppression therapy. This approach has had encouraging results; however, rejection of transplanted tissue from an unmatched donor remains a critical complication. A new study found in the latest issue of STEM CELLS Translational Medicine reports that researchers may have found a way around that.

We demonstrated in mice that a single infusion of adipose-derived stromal cells (ASC) which are stem cells taken from fat in a minimally invasive procedure from an unmatched donor combined with an extremely low dose of bone marrow cells resulted in stable long-term tolerance of the skin graft without undo consequences such as graft versus host disease, said Thomas Davis, Ph.D., a contractor from the Henry M. Jackson Foundation who is working at the Naval Medical Research Centers Regenerative Medicine Department. Dr. Davis is lead author of the study.

He added, As we move forward, we are cautiously optimistic, appreciating that the transition from these laboratory models to proof-of-principle preclinical studies is challenging and not straightforward. If successful, the technology has diverse therapeutic applications in clinical transplantation in both military and civilian settings.

The research team wanted to try using ASCs because these cells have proven to be more potent than bone marrow and cord-blood derived stem cells when it comes to inhibiting the bodys rejection of transplantations from an unmatched donor. They conducted the study by doing skin grafts in mice. One group of grafted mice received no stem cell transfusions; one group received human-derived ASCs after the graft occurred; and another group received a combination of human ASCs and stem cells harvested from the mouses own bone marrow, also after placement of the graft.

More than 200 days later, the combination of human ASC and limited numbers of blood marrow stem cells effectively prevented rejection, with no evidence of graft versus host disease, Dr. Davis reported.

Navy Capt. Eric A. Elster, M.D., professor and chair of the surgery department at Uniformed Services University of the Health Sciences, helped lead the study. ASC constitutively produced high levels of anti-inflammatory/immunoregulatory factors, he said. While further work is needed to validate this approach in other laboratory models before clinical trials can begin, the ability to use ASC, which are non-donor specific and clinically feasible, to induce tolerance opens a new horizon in transplantation.

The implications of this research are broad, said Anthony Atala, MD, editor of STEM CELLS Translational Medicine and director of the Wake Forest Institute for Regenerative Medicine. If these findings are duplicated in additional models and in human trials, there is potential to apply this strategy to many areas of transplantation.

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This article, Adipose-derived Stromal Cells Promote Allograft Tolerance Induction, and more can be accessed at http://www.stemcellsTM.com.

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Fat and Bone Marrow-Derived Stem Cells Combo Shows Promise in Preventing Transplant Rejection

PUBLIC RELEASE DATE:

20-Nov-2014

Contact: Jessica Mikulski jmikulski@nyee.edu 212-979-4274 The Mount Sinai Hospital / Mount Sinai School of Medicine @mountsinainyc

The National Eye Institute (NEI), a division of the National Institutes of Health, has awarded researchers at the Icahn School of Medicine at Mount Sinai a five-year grant totaling $1 million that will support an effort to re-create a patients' ocular stem cells and restore vision in those blinded by corneal disease.

About six million people worldwide have been blinded by burns, trauma, infection, genetic diseases, and chronic inflammation that result in corneal stem cell death and corneal scarring.

There are currently no treatments for related vision loss that are effective over the long term. Corneal stem cell transplantation is an option in the short term, but availability of donor corneas is limited, and patients must take medications that suppress their immune systems for the rest of their lives to prevent rejection of the transplanted tissue.

A newer proposed treatment option is the replacement of corneal stem cells to restore vision. The grant from the NEI will fund Mount Sinai research to re-create a patient's own stem cells and restore vision in those blinded by corneal disease. Technological advances in recent years have enabled researchers to take mature cells, in this case eyelid or oral skin cells, and coax them backward along the development pathways to become stem cells again. These eye-specific stem cells would then be redirected down pathways that become needed replacements for damaged cells in the cornea, in theory restoring vision.

"Our findings will allow the creation of transplantable eye tissue that can restore the ocular surface," said Albert Y. Wu, MD, PhD, Assistant Professor, Department of Ophthalmology at the Icahn School of Medicine at Mount Sinai and principle investigator for the grant-funded effort. "In the future, we will be able to re-create a patient's own corneal stem cells to restore vision after being blind," added Dr. Wu, also Director of the Ophthalmic Plastic and Reconstructive Surgery, Stem Cell and Regenerative Medicine Laboratory in the Department of Ophthalmology and a member of the Black Family Stem Cell Institute at Icahn School of Medicine. "Since the stem cells are their own, patient's will not require immunosuppressive drugs, which would greatly improve their quality of life."

Specifically, the grant will support efforts to discover new stem cell therapies for ocular surface disease and make regenerative medicine a reality for people who have lost their vision. The research team will investigate the most viable stem cell sources, seek to create ocular stem cells from eyelid or oral skin cells, explore the molecular pathways involved in ocular and orbital development, and develop cutting-edge biomaterials to engraft a patient's own stem cells and restore vision.

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Mount Sinai researchers awarded grant to find new stem cell therapies for vision recovery

Dr. Raj Jani Radio Show
Episode #1 Learn what you can do to protect yourself against Ebola, why stem cells can heal your body, and why you need to do yoga.

By: Jani Moon

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Dr. Raj & Jani Radio Show - Video