Penn vet researchers identify a critical growth factor that stimulates sperm stem cells to thrive
... first time a specific "niche factor" in the mouse
testes called colony stimulating factor 1, Csf1, that ... growth factor is the Leydig cell located in the
testes and stimulated by the pituitary gland to supply ... and production of spermatozoa in the
testes of adult males, whether man or mouse. The SSCs' ...
Testes stem cell can change into other body tissues, Stanford/UCSF study shows
... one and the same.
According to the study, the
testes stem cells have different patterns of gene ... authors of the study.
The stem cells from the
testes seem to hover in a gray area between true ... suggest that the stem cells isolated from male
testes have some, but not all the characteristics of ...
Penn Veterinary Medicine report new strategy to create genetically modified animals
... from experimentally induced cryptorchid donor
testes that were then exposed in vitro to AAV vectors ... resulting in colonization of the recipient
testes by transgenic donor cells.
When researchers ... Transgenic germ cells colonized recipient
testes and produced transgenic sperm. When semen was ...
Stem Cells From Testes Produce Wide Range of Tissue Types
... reprogrammed adult stem cells from the
testes of male mice into a wide variety of cell types, ... cells.
If the same can be done with adult
testes stem cells from humans, they may offer a source ... journal Nature .
Only a small subset of adult
testes cells have the ability to develop into multiple ...
Stem cells derived from adult testes produce wide range of tissue types
... in reprogramming adult stem cells from the
testes of male mice into functional blood vessels and ... to develop into multiple cell types -- from adult
testes cells. But only a small subset of cells from the
testes has the potential to become pluripotent, and ...
Researchers clone key sperm-binding proteins
... and rodents. According to Dr.Manjunath and his team, these species produce small amounts of BSPs only in the epididymis, a duct that connects the
testes to the urethra.
"For a few years, we were looking in the wrong place," says Dr. Manjunath. "In addition, the minute quantities of BSP produced in ...
Marijuana Linked to Aggressive Testicular Cancer
... or more external factors, including a simultaneous and comparable rise in the use of marijuana.
Along those lines, the researchers noted that the
testes could be particularly vulnerable to the effects of marijuana, given that the organ -- along with the brain, heart, uterus and spleen -- carries ...
Marijuana use linked to increased risk of testicular cancer
... Sciences Division at the Hutchinson Center.
Established risk factors for testicular cancer include a family history of the disease, undescended
testes and abnormal testicular development. The disease is thought to begin in the womb, when some fetal germ cells (those that eventually make sperm in ...
The Obama Cancer Plan Should Prioritize Prevention, Says Cancer Prevention Coalition
... statistics. These show increases of 45% for thyroid cancer, 18% for malignant melanoma, 18% for kidney cancer, 10% for childhood cancers, and 4% for
testes cancer.
Disturbingly, the NCI has still failed to develop, let alone publicize, any listing or registry of avoidable exposures to a wide range ...
Living with females extends the reproductive life of the male mouse, says Penn veterinary researcher
... niche in the mature adult male testis. In subsequent studies, Brinster determined that when the SSCs of young males were transferred into new young
testes every three months, the SSCs survived for more than three years, a greater than 50 percent increase in life of the stem cell. Therefore, in old ...
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Testes in Medical Technology
Testes in Medical Products
Progesterone EIA Test
Description:... is a steroid produced by the adrenal cortex, the corpus luteum, the
testes and the placenta. As with other steroids, progesterone is synthesized from ... steps [1,2]. Progesterone produced by the adrenal cortex and
testes is almost immediately shunted into other steroidogenic pathways, with only ...
Company:Diagnostic Systems Laboratories, Inc.
Progesterone RIA Test
Description:... is a steroid produced by the adrenal cortex, the corpus luteum, the
testes and the placenta. As with other steroids, progesterone is synthesized from ... steps [1,2]. Progesterone produced by the adrenal cortex and
testes is almost immediately shunted into other steroidogenic pathways, with only ...
Company:Diagnostic Systems Laboratories, Inc.
Testosterone RIA Test
Description:... a C19 steroid, is one of the most potent naturally secreted androgens [1]. In postpubertal males, testosterone is secreted primarily by the
testes with only a small amount derived from peripheral conversion of androstenedione [2]. In adult women, it has been estimated that over 50% of serum ...
Company:Diagnostic Systems Laboratories, Inc.
Testosterone EIA Test
Description:... a C19 steroid, is one of the most potent naturally secreted androgens [1]. In postpubertal males, testosterone is secreted primarily by the
testes with only a small amount derived from peripheral conversion of androstenedione [2]. In adult women, it has been estimated that over 50% of serum ...
Company:Diagnostic Systems Laboratories, Inc.
Estradiol, Ultra-Sensitive RIA Test
Description:... derived from androstenedione. Estrone and estradiol are interconverted in many body tissues. In men, small amounts of estradiol are produced in the
testes and from peripheral conversion of androgens. The biological actions of estradiol include stimulation of linear bone growth, acceleration of ...
Company:Diagnostic Systems Laboratories, Inc.
Estradiol RIA Test
Description:... derived from androstenedione. Estrone and estradiol are interconverted in many body tissues. In men, small amounts of estradiol are produced in the
testes and from peripheral conversion of androgens. The biological actions of estradiol include stimulation of linear bone growth, acceleration of ...
Company:Diagnostic Systems Laboratories, Inc.
Estradiol EIA Test
Description:... derived from androstenedione. Estrone and estradiol are interconverted in many body tissues. In men, small amounts of estradiol are produced in the
testes and from peripheral conversion of androgens. The biological actions of estradiol include stimulation of linear bone growth, acceleration of ...
Company:Diagnostic Systems Laboratories, Inc.
3rd Generation Estradiol RIA Test
Description:... derived from androstenedione. Estrone and estradiol are interconverted in many body tissues. In men, small amounts of estradiol are produced in the
testes and from peripheral conversion of androgens. The biological actions of estradiol include stimulation of linear bone growth, acceleration of ...
Company:Diagnostic Systems Laboratories, Inc.
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Testes in Medical Dictionary
Cryptorchidism
... Cryptorchidism ; Empty scrotum - undescended
testes ; Scrotum - empty (undescended
testes ); Monorchism; Vanished
testes - undescended Receive our free newsletter or ...
Hypogonadism
... used to differentiate hypogonadism ( ovary or
testes ) into primary hypogonadism (problem is with the ovary or
testes ) or secondary hypogonadism (problem is with ... or the hypothalamus ). Anorchia (absense of
testes , or lack of function of ...
Precocious puberty
... signs of puberty (development of breasts ,
testes , pubic and underarm hair , body odor, menstrual ... premenstrual syndrome . Anorchia (absense of
testes , or lack of function of
testes ) Hypogonadism Klinefelter's syndrome ...
Scrotum
... scrotum is the sac (pouch) that contains the
testes , blood vessels, and part of the sperm atic ... Scrotum : The sac of skin that contains the
testes . Semen : The fluid, containing sperm , which ... be 4 degrees cooler than body temperate for the
testes to produce the required quality and quantity of ...
Testes
...
testes Definition: The
testes are two egg-shaped male reproductive organ s ... and the male hormone , testosterone .
testes Powered by: This information is provided by an ...
Gland
... ad renal , islands of Langerhans in the pancreas , and the gonad s (
testes and ovaries). Northern En gland 'worst for binge drinking' 7 August ... s Breast Disease s Gonad al Disorders - Disease of the ovaries and
testes of any etiology . Endocrine gland s Pelvic laparoscopy Female ...
Gonad
... Alternate Names : Gonad s - Male, Testicles, Testis Definition The
testes are two egg-shaped male reproductive organ s located in the scrotum . ... injection s ... Gonad al Disorders - Disease of the ovaries and
testes of any etiology . Para thyroid Diseases ... Gonad otropina corinica ...
Ovarian hypofunction
... hormone production. Jump to another section ... Anorchia (absense of
testes , or lack of function of
testes ) Hypogonadism Klinefelter's syndrome Menopause Ovarian failure ...
Renal
... by drugs. Examples include macrophage s, lymphocyte s, the brain, and
testes . Renal ( kidney ) causes of vitamin D malabsorption should be ... s Breast Disease s Gonad al Disorders - Disease of the ovaries and
testes of any etiology . ad renal glands Located on top of the kidney s, ...
Sperm
... [Kellogg] Testicular Atrophy ... Sperm Definition: The
testes are two egg-shaped male reproductive organ s located in the scrotum . ... that you are HIV -positive. During sexual activity, sperm from the
testes enters the urethra near the opening of the bladder . Normally, a ...
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Testes in Biological News
Human adult testes cells can become embryonic-like
... Center have extracted stem/progenitor cells from
testes and have converted them back into pluripotent ... are among the first scientists to show that human
testes stem cells can become embryonic stem-like cells, ... a new and simpler method to isolate the
testes stem/progenitor cells than has not been seen in ...
Female embryonic sexual development driven by universal factor
... Y chromosome) that appeared to be essential for
testes formation.
But when researchers discovered some rare cases of individuals who developed
testes even though they had two X chromosomes and no Y ... called the "Z" hypothesis, which proposed that
testes development was actually the default pathway. ...
Penn Veterinary Medicine report new strategy to create genetically-modified animals
... from experimentally induced cryptorchid donor
testes that were then exposed in vitro to AAV vectors ... resulting in colonization of the recipient
testes by transgenic donor cells.
When researchers ... Transgenic germ cells colonized recipient
testes and produced transgenic sperm. When semen was ...
October 2008 Biology of Reproduction highlights
... Because the CKO mice exhibited transient fertility, an elegant reporter strategy was used to demonstrate that elongated spermatids present in the CKO
testes did express the Cre recombinase; therefore, it is likely that differentiation to this stage can occur in the absence of DICER1. Nonetheless, Dicer1 ...
New study points to agriculture in frog sexual abnormalities
... have found that toads in suburban areas are less likely to suffer from reproductive system abnormalities than toads near farms where some had both
testes and ovaries.
"As you increase agriculture," said Lou Guillette, a distinguished professor of zoology, "you have an increasing number of ...
Eliminating germline lengthens fly lifespan, Brown study shows
... team found a possible explanation for the paradox. In reaction to the flies brains boosting insulin production, the insects gonads their ovaries or
testes produce a protein that acts like a sponge, binding to the insulin and blocking its signals throughout the body. So the flies respond as if there is ...
Armed beetles find a mate, whatever their size
... sites with the big males, and attempt sneaky matings with females behind the bigger males backs. Whats more, these males have relatively larger
testes and produce sperm that is more competitive than the bigger males.
The L. japonicus beetles have ensured that, through their size-determined mating ...
Safeway Inc. and PCF to fund landmark prostate cancer research collaboration
... begins in the testes, which are a few degrees cooler than the rest of the body. The structural machinery of cancer cells spreading outside the
testes may be altered by the higher body temperatures, making them more susceptible to standard chemotherapy treatments than other cancer types.
While ...
Vaginal reconstruction not needed for most inter-sex females, Hopkins study shows
... Women with complete androgen insensitivity are born with relatively shallow vaginas that may or may not require surgical repair and with undescended
testes that do require removal.
Vaginal surgery, if needed or wanted, should be done after puberty, when physical development is complete and a girl or ...
Injection may prevent infertility in men receiving cancer chemotherapy
... It may be possible to protect the
testes of cancer patients against the loss of fertility ... After 30 days they were euthanized and their
testes examined and weighed. The researchers found ... weight loss.
"Tissue analysis of the
testes of Taxol-injected mice showed severe atrophy and ...
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Testes in Biological Technology
New Report Just Published: World Prostate Cancer Therapeutics Market Report
... by Cancer Type in the US, 2000- 2004 (includes
corresponding Graph/Chart) II-18
Prostate - Structure II-18
Pituitary Gland II-19
testes II-19
Prostate Cancer - A Primer II-20
Key Facts to Gaze at II-20
Table 13: Lifetime Probability of Developing Cancer (in Men)
by ...
RT-PCR Primers for the Study of Apoptosis
... library generated a PCR product larger in size
than expected (lane 4). This may be a spliced version of Fas antigen found
in
testes or an artifact. Again, the amplification of the rat Fas antigen
gene is specific. No band appeared on the control lanes with mouse and
...
Testes in Biological Definition
Spermatogenesis
... or genesis, of sperm cells, which occurs in the male gonads or
testes . Sperm cells develop initially from germ stem cells known as ... is maintained.
Spermatozoa are produced in seminiferous tubules in the
testes . They start off as spermatogonia , undergoing mitosis becoming a type A ...
Klinefelter's syndrome
... is characterised by gynecomastia (enlarged breasts), a rounded body type with abnormal body proportions, sparse facial and body hair , small
testes , and an inability to produce sperm . Most XXY males have some degree of language impairment as well. The syndrome is associated with an increased ...
Semen
... 5 References
6 External links
Composition
Around 200 million to 500 million spermatozoa (or 'sperm', for short), produced in the
testes , are released per ejaculation. However, they make up only about 2–5% of the volume of semen. The bulk of the semen is composed of seminal ...
Sperm
... by a minimum of cytoplasm.
Sperm production
Main article: Spermatogenesis
Sperm are produced in the seminiferous tubules of the
testes in a process called spermatogenesis. Round cells called spermatogonia divide and differentiate eventually to become sperm. During sexual ...
Testes in Biological Dictionary
Testes
... 4.2 Diseases and conditions that affect the
testes . 4.3 Effects of exogenous hormones ... Lymphatic drainage of the
testes follows the testicular arteries back to the ...... ... 4.2 Diseases and conditions that affect the
testes . 4.3 Effects of exogenous hormones ... ...
Gonads
... gonad is the organ that makes gametes. The gonads in males are the
testes and the gonads in females are the ovaries. The product, gametes, are ... a part of the development of reproductive system and ultimately forms the
testes Gonads are the true sex organs, generating reproductive gametes ...
Urethra
... ... The urinary tract is made up of the kidneys, the ureters, the bladder, and the urethra . The male reproductive tract includes the penis,
testes (testicles). The ... ... of cancer of the urethra . Anterior urethral cancer. Posterior ... How cancer of the urethra is treated. ...
Spermatids
... their permissiveness in ... Round spermatids , characterized by their small size as well as a centrally ... ... spermatids was observed in the
testes from rats in which ... Key words: Pachytene spermatids , round spermatids , developing rat testis, spermatogenic arrest ... Classification of ...
Seminiferous tubules
... reproductive function ( in animal reproductive system: Testes; In anurans, amniotes (reptiles, birds, and mammals), and even some teleosts,
testes are composed largely of seminiferous tubules—coiled tubes, the walls of which contain cells ... At the forefront of medicine, Gene ...
Scrotum
... penis and anus. In humans and some other mammals, the base of ... scrotum n. , pl. -ta or -tums . The external sac of skin enclosing the
testes in ... The skin of the scrotum is exceptionally thin and beset with thinly ... The cause of an acute scrotum can usually be established based ...
Ovary
... ovum-producing reproductive organ, often found in pairs as part of the vertebrate female reproductive system. Ovaries in females are homologous to
testes in males, in that they are both gonads and ... In the flowering plants, an ovary is a part of the female reproductive organ of the ...
Inverted Repeats
... - Inverted Repeats Finder. Please ... " Inverted Repeat Structure of the Human Genome: ... Highly Homologous Inverted Repeats That Contain
testes Genes" ... Inverted Repeats Database (IRDB) is a public repository of information on ... These currently include, the Inverted Repeats ...
Interstitial cells
... the free encyclopedia. Jump to: navigation, search. Interstitial cells may refer to: Leydig cells , cells present in the male
testes ... interstitial adj. Relating to, occurring in, or affecting interstices. Anatomy. Relating to or situated ... and surrounds the cells of ...
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