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Latest Germ cells Stories

2010-02-05 13:21:15

Most of us probably think of sperm as rather active little cells, swimming with quick movements of their "tail" or flagella. But actually sperm's motility is in fact short lived. When in the male reproductive tract they have to rest easy, lest they wear themselves out prematurely and give up any chance of ever finding an egg. Scientists have long known that sperm's activity level depends on their internal pH. And now -- after many years of looking "“ researchers reporting in the...

2010-02-05 13:07:44

UCSF researchers have identified an elusive molecular regulator that controls the ability of human sperm to reach and fertilize the egg, a finding that has implications on both treating male infertility and preventing pregnancy. The team of biophysicists and molecular biologists also broke through a previous barrier to this research by developing a method to record electrical activity of a single human sperm cell through a process called patch-clamping. The new findings shed light on a number...

2009-12-15 14:05:00

Reproductive researchers from the University of Pennsylvania and The Children's Hospital of Philadelphia have succeeded in isolating and transplanting pure populations of the immature cells that enable male reproduction in two species"”human spermatogonia and mouse gonocytes. These germline stem cells, taken from testis biopsies, demonstrated viability following transplantation to mouse testes within a controlled laboratory setting. The results indicate remarkable similarity between the...

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2009-10-29 06:05:00

U.S. geneticists say that for the first time ever they have successfully managed to induce human embryonic stem cells to transform into germ cells capable of producing egg and sperm cells "” a discovery that not only illuminates a previously ill-understood phase of human development but one that also carries practical potential for the treatment of infertility. Dr. Renee Riejo Pera of Stanford University in California explained that getting back to the earliest phases of human life and...

2009-10-28 22:11:43

Advance provides potential tool to find causes of unexplained infertility, birth defects Researchers funded in part by the National Institutes of Health have discovered how to transform human embryonic stem cells into germ cells, the embryonic cells that ultimately give rise to sperm and eggs. The advance will allow researchers to observe human germ cells"”previously inaccessible"”in laboratory dishes. "This achievement opens a new window into what was only recently a hidden stage...

2009-10-15 13:31:00

Prototype Anonymous Donor Database In Development FAIRFAX, Va., Oct. 15 /PRNewswire-USNewswire/ -- Four of America's leading donor sperm providers have formed a new, non-profit association, the Association of Gamete Donor Providers (AGDP). AGDP will help donor gamete providers to share information and services, enhance educational programs and promulgate policies and activities to benefit individuals and organizations involved in all aspects of building families with the help of donor...

2009-08-18 15:58:00

GPx5, an antioxidant protein that protects immature spermatozoa once they have left the testicle, has been identified by the GReD Unit (1) (CNRS / INSERM / Universities de Clermont-Ferrand).  This discovery by Joël Drevet and his team establishes a link between post-testicular oxidative stress and degradation of the DNA in male gametes.  These findings, which presage a major clinical impact "“ particularly in the context of medically-assisted procreation...

2009-08-03 09:11:57

Almost all organisms evolve from a single cell, a fertilized egg. In the first hours after fertilization, the fate of its future development is determined. It is dictated by the separation of cells that will become sperm and ovules - germ cells-, from the remaining cells, which will be responsible for forming the body "“organs and tissues -, and that comprise the somatic cell line. Scientists at the Institute for Research in Biomedicine (IRB Barcelona), headed by Jordi Casanova,...

2009-07-24 07:20:23

The vast improvement in cancer treatment and increased survival rates have created a challenge for young cancer patients, since the chemotherapy and radiation treatments that save lives often threaten fertility. Techniques to safeguard fertility, such as freezing eggs for later embryo development, have low odds of success, leaving patients with limited reproductive options. That is beginning to change, as researchers improve techniques, mature human eggs in the laboratory, and discover...

2009-07-20 14:24:01

Cancer treatment has come a long way, leading to a multitude of therapy options and improved survival rates. These successes, however, have created a challenge for young cancer patients since chemotherapy and radiation treatments that often save lives threaten fertility. Techniques available to safeguard fertility, such as freezing eggs for later embryo development, have poor odds of success, leaving patients with very limited options for the future. But that is beginning to change as...


Word of the Day
tessitura
  • The prevailing range of a vocal or instrumental part, within which most of the tones lie.
This word is Italian in origin and comes from the Latin 'textura,' web, structure.