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Tag: "ovaries" at biology news

A gene's first 'kiss' sets off that affair known as puberty

...e rising levels of LH and FSH cause the testes and ovaries to produce the sex hormones testosterone and estradiol, the culprits responsible for the physical changes and emotional baggage of male and female puberty, respectively. "We now have very good evidence that the GPR54 gene and its switch, the kisspep...

First frozen egg baby born in Canada

... the MUHC and Dr. Tan. Each egg extracted from the ovaries of the patient is drawn into a protective device, invented by Drs. Chian and Tan, called a "Cryoleaf", and then placed in a special vitrification solution. The eggs undergo super-rapid cooling at a rate of more than 20,000ºC per minute, which prevent...

Human Eggs Can Develop From Ovarian Surface Cells In Vitro

...ic stem cells. More recent research of adult human ovaries has shown that oocytes and granulosa cells (the la...cells. By scraping cells from the surface of adult ovaries and growing them for 5 to 6 days in the presence of an estrogen-containing medium (phenol red) to st...

Stem cells in bone marrow replenish mouse ovaries

...team reporting the first preliminary evidence that ovaries of mice can be renewed with new eggs in adulthood....d cell transplants appear to completely revive the ovaries of female mice sterilized by chemotherapy. Just 24 hours after a transplant, the sterilized mice had...

Discovery suggests why stem cells run through stop signs

...etically modified stem cells from the fruit flies' ovaries and studied how many egg chambers the mutant stem cells produced as compared to normal stem cells. The production rate in the mutant cells fell over the course of 12 days, and the researchers concluded it was because the mutant stem cells were no lon...

Israeli scientists successfully transplant frozen-thawed ovaries in sheep

... successfully transplanted whole frozen and thawed ovaries in sheep, retrieved oocytes from these ovaries and triggered them in the laboratory into early embryonic development. Follow-up tests showed that ...

A surprising pair of proteins help make healthy eggs

...n parallel, Brown scientists studied the defective ovaries of TAF4b-deficient mice. What they found in mice was similar to what the Berkeley team found in cultured cells: When the level of TAF4b protein decreased, granulosa cells withered, broke apart and failed to multiply. A similar process may be at work ...

Component in soy products causes reproductive problems in laboratory mice

...f soy, was found to disrupt the development of the ovaries in newborn female mice that were given the product...dy looks at the direct effects of genistein on the ovaries during early development. "We knew genistein was linked to reproductive problems later in life, but...

ASU researchers find link between social behavior, maternal traits in bees

...en is removed, some of these females develop their ovaries and lay eggs." Foraging for pollen is a maternal ...igh pollen-hoarders would win the race and develop ovaries sooner than the low pollen-hoarders. Amdam's prediction proved to be correct when after 10 to 21 da...

New weapon in battle against osteoporosis

...is has been supported by experiments on mice whose ovaries were removed. The resulting oestrogen deficiency would normally lead to a depletion of bone material and finally to "mouse osteoporosis". "We treated these mice with an active substance that bonds specifically to the CB2 receptor. In this way we were...

Study finds that a woman's chances of having twins can be modified by diet

...nimal's milk. IGF increases the sensitivity of the ovaries to follicle stimulating hormone, thereby increasing ovulation. Some studies also suggest that IGF may help embryos survive in the early stages of development. The concentration of IGF in the blood is about 13 percent lower in vegan women than in wome...

Even when faint, ovary scent draws sperm cells

...rstanding why, how and when sperm are attracted to ovaries may help scientists understand problems with human conception. "Defects in sperm chemotaxis may be a cause of infertility, and consequently, sperm chemotaxis could potentially be used as a diagnostic tool to determine sperm quality or as a therapeu...

Stem cells engage in dialogue with the cells that regulate their futures

...ab used the germline stem cell niche, found in the ovaries of fruit flies, as a model system. The production of fruit fly eggs depends on the presence of a renewable source of stem cells in the ovary of the adult fruit fly. Inside the fruit fly ovary are structures called germarium which contain tiny cr...

Study of planarians offers insight into germ cell development

...ells. Blocking nanos in mature adults caused their ovaries and testes to disappear. And when the researchers blocked nanos expression in planarians that had had their bodies and reproductive organs detached from their brains, the planarians regenerated new bodies, but with no reproductive cells. "This is ...

Researchers identify ovarian cancer biomarkers

...nts in ovarian tumors were not expressed by normal ovaries or other healthy organs. The researchers also found these markers were not present in normal reproductive tissues that experience blood vessel growth, such as the placenta or endometrium. This suggests that the markers are specific to tumors and woul...

Studies to find better ways to preserve human eggs, ovarian tissue under way

...aking proper connections. “The reason for using ovaries is when you have cancer, if you need chemotherapy,...hey also are retrieving and maturing eggs from cow ovaries donated by a local slaughterhouse. Bull sperm will be used to test the viability of cow eggs afterwa...

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