“Latest Stem Cells News”

Researchers at UTHealth have demonstrated in rats that transplanting genetically modified adult stem cells into an injured spinal cord can help restore the electrical pathways associated with movement. The results are published in today’s issue of the Journal of Neuroscience.

In spinal cord injury, demyelination, or the destruction of the myelin sheath in the central nervous system, occurs. The myelin sheath, produced by cells called oligodendrocytes, wraps around the axons of nerves and helps speed activity and insulate electrical conduction. Without it, the nerves cannot send messages to make muscles move.

The research team, led by Qilin Cao, M.D., principal investigator and associate professor of neurosurgery at UTHealth (The University of Texas Health Science Center at Houston), discovered that transplanted adult stem cells (oligodendrocyte precursor cells or OPC) from the spinal cord could become oligodendrocytes. The new cells helped restore electrical pathways of the spinal cord and therefore, function, in a process called remyelination.

Although embryonic stem (ES) cells have been induced to differentiate into diverse neuronal cell types, the production of cortical projection neurons with the correct morphology and axonal connectivity has not been demonstrated.

Here, we show that in vitro patterning is critical for generating neural precursor cells (ES-NPCs) competent to form cortical pyramidal neurons.

For the first time in the United States, stem cells have been directly injected into the spinal cord of a patient, researchers announced Thursday.

Doctors injected stem cells from 8-week-old fetal tissue into the spine of a man in his early 60s who has advanced ALS, or amyotrophic lateral sclerosis. It was part of a clinical trial designed to determine whether it is safe to inject stem cells into the spinal cord and whether the cells themselves are safe (…)

Discover StemCells, Inc. A pioneer in the field of neural stem cells, StemCells Inc was founded by the renown Irving Weissman, Fred Gage, and David Anderson. Martin McGlynn, CEO, presents StemCells Inc’s use of neural stem cells, and clinical development strategy based on the neuroprotective effect of neural stem cells.

Stem Cells Inc is preparing a BLA for NCL (a.k.a. Batten’s Disease). Martin reveals the source of the stem cells used, as well as the quantity of cells needed for the treatment of various diseases. StemCells Inc’s next clinical trials (PMD, spinal cord, macular degeneration) and milestones are also presented here. We conclude this interview with Martin’s comments on successfully dealing with the complexity of regularity matters, beyond FDA approval.

Adult stem cells tested for defects before being implanted in the injured spinal cords of mice helped the animals recover with no cancerous side effects, according to new research. In recent years, scientists found that some experimental stem cell therapies can cause cancerous tumors. Pre-screened cells could result in potentially life- saving treatments without such side effects.

These new findings were presented at Neuroscience 2009, the annual meeting of the Society for Neuroscience and the world’s largest source of emerging news about brain science and health. “We tried to identify induced pluripotent stem cells from adult tissue that would be safe when applied to cell therapy for central nervous system disorders,” said Masaya Nakamura, MD, PhD, at Keio University School of Medicine, a co-author of the study. “These results suggest that properly pre-evaluated cells may be a promising source for future transplantation therapy.”

Here, the authors investigated the possibility of making transplantation therapies safer and more efficient by examining different types of stem cells. They generated 36 induced pluripotent stem cell clones, which differed in their origins and other characteristics. They found that the cell’s origin was a crucial indicator of whether the cells would result in tumors.

Results showed that immature (undifferentiated) stem cells are more likely to form tumors than mature ones. The transplantation of “safe” cells into mice with spinal cord injuries resulted in the formation of new neurons, while “unsafe” cells sped recovery for a short period but ultimately formed tumors.

“This study confirms that before human clinical trials go forward involving treatment of central nervous system disorders with induced pluripotent stem cells, pre-evaluating each cell clone carefully is essential,” Nakamura said.

from http://www.sciencedaily.com/releases/2009/10/091022115618.htm

Deep in the brain, buried in the hippocampus and subventricular zone, reside adult neural stem cells, cells that retain the ability to become other types of neural cells and could serve as possible treatments for ailments ranging from vision impairment to Parkinson’s to spinal cord injuries. Doctors, scientists and patients, however, are understandably hesitant to go digging around for them, their location being “a great deterrent,” Sally Temple, founder of the New York Neural Stem Cell Institute, said at the 2009 World Stem Cell Summit here on Wednesday.

Researchers, therefore, are anxious to uncover other, more accessible neural stem cell candidates. Temple and her team have turned their sights to the retinal pigment epithelium (RPE), a layer of tissue at the base of the retina that comes into being within 30 to 50 days of conception, before many other parts of the neural system differentiate. Cells from this area of the eye can be easily harvested from retinal fluid that is usually discarded during retinal surgery, she explained (…)

from http://www.scientificamerican.com/blog/60-second-science/post.cfm?id=stem-cells-bring-new-insights-to-fu-2009-09-24