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Testosterone in Biological News

UCSB study finds physical strength, fighting ability revealed in human faces

... "Many studies have been done on the effects of testosterone on the face. There's a good chance testosterone is involved in regulating the body for battle, and men with high testosterone those with a heavy brow ridge and thicker jaw ...

ACS PressPac -- Sept. 17, 2008

... understand one effect of the male sex hormone, testosterone how injections of the hormone suppress ... almost total sperm suppression with an injectable testosterone combined with a synthetic hormone called ... In a new study on men, they found that testosterone combined with LNG changed the body's production ...

Testosterone replacement theraphy beneficial in men 60 and older

... levels of estrogen and men with low levels of the testosterone are known to be at risk. Low levels of gender ... cracking in a slip or fall. For this reason, testosterone replacement therapy (TRT) is the standard of care ... been the subject of some controversy. Continuous testosterone use has been associated with prostate cancer and ...

Too much sugar turns off gene that controls the effects of sex steroids

... off the gene that regulates the levels of active testosterone and estrogen in the body, shows a new study in ... plays a key role in controlling the amount of testosterone and estrogen thats available throughout the body. If theres less SHBG protein, then more testosterone and estrogen will be released throughout the ...

Testosterone turns male juncos into blustery hunks -- and bad dads

... BLOOMINGTON, Ind. -- The ability to ramp up testosterone production appears to drive male dark-eyed juncos ... with an evolutionary cost. Big fluctuations in testosterone may also cause males to lose interest in ... in the wild, the way in which natural changes in testosterone levels determine how a male spends his time. ...

American Chemical Society's Weekly PressPac - Oct. 10, 2007

... with age-related declines in the sex hormone testosterone has led researchers in California to report ... medication, limit its use to older men with low testosterone levels. testosterone replacement therapy may increase the risk of ...

Study finds that even aloof husbands have lower testosterone levels than unmarried men

... first outside of North America to observe lower testosterone levels among married men. Supporting a growing ... and provide minimal parenting have much lower testosterone levels than single, unmarried men. In the ... University) investigated the links between male testosterone levels and marital status among modern-day ...

Environmental cues control reproductive timing and longevity, University of Minnesota study shows

... the number of kids you have during your lifetime." Fluctuations in testosterone levels provide an example of how the environment and organisms interact to ... professor in the College of Biological Sciences and Ratcliff's adviser. testosterone suppresses the immune system. So when environmental conditions trigger ...

Targeting helpers of heat shock proteins could help treat cancer, cardiovascular disease

... 90 gets steroid receptors into shape to use hormones like estrogen and testosterone could lead to targeted therapies for hormone-driven cancers, such as ... role estrogen seems to have in women before menopause and the fact that testosterone doesn't seem to do the same for men of any age. "So how do you get both ...

Sugar, spice and puppy dog tails: Developing sex-typed personality traits and interests

... provided by the children, and saliva samples that measured the children's testosterone levels. Not surprisingly, girls and boys differed in their sex-typed ... Finally, children who showed faster rates of increase in the hormone testosterone in early adolescence weren't as affected by social influences on their ...

Honest crabs, power to the hungry, nice mice and clever meerkats: News from the American Naturalist

... They found that dominant males who controlled breeding groups had lower testosterone levels than subdominant males. "What is unusual about this society is that ... living males, which roam from one group to another, that have the highest testosterone levels." The roaming males try to coerce females to mate, which, as one ...

Low sperm count may be associated with prenatal testosterone excess

... In this study, researchers treated pregnant sheep with 30 mg testosterone propionate twice weekly from days 30 to 90 of pregnancy and with 40 mg testosterone propionate from days 90 to 120 of pregnancy. They found a significant ...

Why a common treatment for prostate cancer ultimately fails

... by showing that the androgen receptor, through which male hormones like testosterone work, is much more versatile than previously thought. Under certain ... With hormone therapy, physicians blunt the effects of male hormones like testosterone to bring the disease in the prostate to a halt. One form of hormone ...

News tips from the Journal of Neuroscience

... can be induced experimentally in white-crowned sparrows by controlling testosterone levels and photoperiod. To determine whether inhibiting caspasethe primary ... greater in the infused nucleus than in the contralateral nucleus after testosterone withdrawal, and the number of degenerating neurons was lower. Furthermore, ...

Biology of Reproduction highlights

... follicular testosterone. How exposure of oocytes to follicular testosterone may influence the ability of a metaphase II egg to be preferentially ... sperm remains a mystery. What is known is that chronic stress elevates testosterone in females (but not males). So if you would like your next sibling to be a ...

U. Iowa study finds biological link between pain and fatigue

... protein involved in muscle pain works in conjunction with the male hormone testosterone to protect against muscle fatigue. Chronic pain and fatigue often occur ... in fatigue between males and females depends on both the presence of testosterone and the activation of ASIC3 channels, which suggests that they are ...

High levels of estrogen associated with breast cancer recurrence

... estrogen) and testosterone. They analyzed different forms of estradiol and testosterone in the blood, such as how much was bound to transport proteins (such as to ... double the average for women who remained cancer-free. Increased levels of testosterone or SHBG levels were not associated with recurrence, contradicting the ...

Plastics chemical retards growth, function of adult reproductive cells

... study found that follicle growth was impaired after 48 hours of exposure to BPA, Peretz said. Reductions in three key steroid hormones progesterone, testosterone and estradiol were also seen after 120 hours of exposure to BPA. The drop in steroid hormone production was quite dramatic. After 120 hours in a ...

New drug shows promise in treating drug-resistant prostate cancer

... anti-androgen therapies. Approximately 186,000 new cases of prostate cancer are diagnosed each year in the United States. The male hormones testosterone and dihydrotestosterone, which are also known as androgens, spur the growth of prostate cells, and drugs that block the receptors for these hormones ...

New medications show promise in treating drug-resistant prostate cancer

... University of Washington and Medivation. About 186,000 new cases of prostate cancer are diagnosed each year in the United States. The male hormones testosterone and dihydrotestosterone -- also known as androgens -- spur the growth of prostate cells, and drugs that block the receptors for these hormones are ...

Men are the weaker sex

... risky behavior later in life." Good Reasons for Associated Risks Boys may take more risks as the result of peer pressure, and the presence of testosterone in a boy's bloodstream could also lead to more dangerous behavior. But this is not necessarily a bad thing, Prof. Glezerman believes. "Men become ...

New lab evidence suggests preventive effect of herbal supplement in prostate cancer

... lesions because the cells can induce DHEA to become more androgenic," said Arnold. Combining DHEA with transforming growth factor beta-1 increased testosterone production in the stromal cells and prostate specific antigen protein secretion two to four-fold and gene expression up to 50-fold in the cancer ...

Scientists find facial scars increase attractiveness

... scarring as an attractive quality for short-term relationships because they found it be a symbol of masculinity, a feature that is linked to high testosterone levels and an indicator of good genetic qualities that can be passed on to offspring. Men without scars, however, could be seen as more caring and ...

6 environmental research studies reveal critical health risks from plastic

... and behavioral effects. Plastic products contain "endocrine disrupting chemicals" that can block the production of the male sex hormone testosterone (phthalates used in PVC plastic), mimic the action of the sex hormone estrogen (bisphenol A or BPA used in polycarbonate plastic), and interfere with ...

The dietary supplement genistein can undermine breast cancer treatment

... levels of estrogen. Other tissues, however, produce a steroid hormone, androstenedione (AD), which with the help of aromatases is converted to testosterone and estrogens. The estrogens produced from AD can stimulate the growth of some types of breast cancer tumors. The researchers conducted several ...

Sex hormones link to heart risk

... average, 19 years, from the Young Men Cardiovascular Association study. The researchers looked at ways that the sex hormones - estradiol, estrone, testosterone and androstenedione - interacted with three major risk factors of heart disease (cholesterol, blood pressure and weight). They found that two ...

New study points to agriculture in frog sexual abnormalities

... reproductive organs. Many had both ovaries and testes. Not only that, both the impacted males and the intersex frogs had less of the male hormone testosterone than normal males, suggesting diminished reproductive capabilities, Guillette said. Guillette and McCoy said the study's results may have ...

High hormone levels in seabird chicks prepare them to kill their siblings

... ready to kill its brother or sister. Wake Forest University biologists and their colleagues have linked the murderous behavior to high levels of testosterone and other male hormones found in the hatchlings. The study appears in the June 18 edition of the online journal PLoS ONE available at ...

Disabling mouse enzyme increases fertility

... female mice were maturing earlier, were always receptive to male overtures for mating and had a disrupted ovulatory cycle. Males had higher levels of testosterone and females had higher levels of estrogen. Surprisingly, the altered female mice were also better mothers: They ate their pups less often. "One ...

Genes may play role in risk assessment for prostate cancer among Hispanics and caucasians

... the nuclear Vitamin D receptor (CDX2 and FokI), which modulates the actions of Vitamin D, and from 5-reductase type II (V89L & A49T), which converts testosterone to dihydrotestosterone, a more potent form of the male hormone. Among non-Hispanic white men with V89L, FokI was associated with a more than 50 ...

The top 5 ways medical physics has changed health care

... tomography (PET). This technique uses short-lived radionuclides produced in cyclotrons. These nuclides are labeled to compounds such as glucose, testosterone and amino acids to monitor physiological factors including blood flow and glucose metabolism. These images can be crucial in detecting seizures, ...

MIT: Why men are more prone to liver cancer

... some mice a powerful androgen to see if that would promote tumors. Neither treatment had any effect, demonstrating that male sex hormones such as testosterone do not directly promote liver cancer in adults. These results could be relevant to cancers of other organs, such as the stomach and colon, which ...

Osteoarthritis risk linked to finger length ratio

... in women, these fingers tend to be about equal in length. Smaller 2D:4D ratios have intriguing hormonal connections, including higher prenatal testosterone levels, lower oestrogen concentrations, and higher sperm counts. Reduction in this ratio has also been linked to athletic and sexual prowess. ...

Physician-scientists seek solutions to reproductive problems related to chromosomal variations

... research in the laboratory focuses on understanding the mechanism by which the presence of an additional X chromosome affects sperm production and testosterone synthesis in males with Klinefelter syndrome. These critical and unique studies will allow us to provide improved treatment and management ...

Eat chocolate, drink wine, add fun to life: SLU geriatrician shares secrets of staying young

... walking, to strengthen bones. Add in resistance or weight training, adequate calcium and vitamin D and medications that could include estrogen or testosterone if recommended by your doctor. Stay on your feet. About 95 percent of all hip fractures come from falls and account for more than 800,000 ...

New prostate cancer research findings

... Cancer researchers have long worked to understand why some prostate cancers recur after the use of therapies designed to stop the production of testosterone and other androgens that fuel cancer cell growth. New research has now detected that androgen-synthesizing proteins are present within cancer cells, ...

Male contraception breakthroughs to be presented, Seattle Sept. 27-28

... how it works in animals, and finding the right dose (University of Kansas and University of Minnesota) clinical proof-of-concept studies on testosterone alternatives for use in a "male pill" (GTx, Inc., SARMs) evidence of public demand, including survey results (International Male Contraception ...

Genetic variant linked to odor perception

... focused on two chemicals androstenone and androstadienone that are created naturally by the body during the breakdown of the male sex hormone testosterone and are excreted in sweat and urine. We found that genetic variations of a specific odor receptor determine, to a significant degree, why the same ...

Gene determines whether male body odor smells pleasant

... To many, urine smells like urine and vanilla smells like vanilla. But androstenone, a derivative of testosterone that is a potent ingredient in male body odor, can smell like either - depending on your genes. While many people perceive a foul odor from ...
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