An Iranian scientist managed to develop a new method to propagate human spermatogonial stem cells from small testicular biopsies to obtain adequate number of cells for successful transplantation for 18000-fold in vitro, leading to protection of the fertility of immature boys suffering from cancer.
The research carried out jointly with Amsterdam University in Holland is the first developed method in the world.
Hooman Sadri-Ardekani, Ph.D in Reproductive Medicine and a Professor in Avicenna Institute-ACECR told ISNA, “Young boys treated with high-dose chemotherapy are often confronted with infertility once they reach adulthood and cryopreserving testicular tissue before chemotherapy and auto transplantation of
For decades, biology textbooks have been clear – our traits are the product of our genes. But a new study by Yale University researchers published Dec. 26 in Nature Genetics suggests another mechanism can regulate variations of traits even in genetically identical individuals.
A particular type of RNA works in concert with a common protein to protect organisms from harmful genetic variations without the help of genes, reports Haifan Lin, director of the Yale Stem Cell Center, professor of cell biology and genetics and senior author of the paper.
“This mechanism may help explain how ordinary
New technique removes several hurdles in generating induced pluripotent stem (iPS) cells, smoothing the way for disease research and drug development.
Stem cells are ideal tools to understand disease and develop new treatments; however, they can be difficult to obtain in necessary quantities. In particular, generating induced pluripotent stem (iPS) cells can be an arduous task because reprogramming differentiated adult skin cells into iPS cells requires many steps and the efficiency is very low – researchers might end up with only a few iPS cells even if they started with a million skin cells.
A team at Sanford-Burnham Medical
When infections occur in the body, stem cells in the blood often jump into action by multiplying and differentiating into mature immune cells that can fight off illness. But repeated infections and inflammation can deplete these cell populations, potentially leading to the development of serious blood conditions such as cancer.
Now, a team of researchers led by biologists at the California Institute of Technology (Caltech) has found that, in mouse models, the molecule microRNA-146a (miR-146a) acts as a critical regulator and protector of blood-forming stem cells (called hematopoietic stem cells, or HSCs) during chronic inflammation, suggesting that a deficiency of