Navigation Links
New brain hormone puts brakes on reproduction

icates via a blood portal with the anterior pituitary and stimulates production of the hormones gonadotropin, luteinizing hormone and follicle stimulating hormone.

These hormones are dumped into the bloodstream and make their way to the gonads, where in males they stimulate production of testosterone and the maturation of sperm. In females, the hormones stimulate production of estradiol, a sex steroid hormone and the body's main form of estrogen, and regulate ovulation, the production of fertile eggs.

Estradiol and testosterone, in turn, feed back on the pituitary to shut down production of pituitary hormones, establishing feedback that keeps the body's sex hormones on an even keel.

Estradiol also works higher in the brain, on the hypothalamus, to ramp down production of GnRH, but how this works has been a relative mystery. The new study provides an answer: Estradiol stimulates cells in the dorsomedial nucleus of the hypothalamus to produce GnIH, which appears to act directly on cells in the hypothalamus to turn off their production of GnRH.

"Here, we have a novel neural pathway mediating the regulatory actions of sex steroids," said Lance Kriegsfeld, UC Berkeley assistant professor of psychology.

"This is an example of the reproductive system being fine tuned," said George Bentley, UC Berkeley assistant professor of integrative biology. "We know a lot about the gross regulation of the reproductive system, but fine tuning hasn't been well understood at all."

GnIH was discovered five years ago in quail by Japanese researchers led by Kazuyoshi Tsutsui, a professor on the faculty of integrated arts and sciences at Hiroshima University. The discovery supplied one of the last remaining pieces of the bird's hormone system that controls reproduction. GnIH seemed to be the missing antagonist that switches off pituitary gonadotropins, and work by Tsutsui and Bentley in quail and white-crowned sparrows confirmed its role in turn
'"/>

Source:University of California - Berkeley


Page: 1 2 3 4

Related biology news :

1. Controversial drug shown to act on brain protein to cut alcohol use
2. Mouse brain cells rapidly recover after Alzheimers plaques are cleared
3. Mouse brain tumors mimic those in human genetic disorder
4. New imaging method gives early indication if brain cancer therapy is effective, U-M study shows
5. First atlas of key brain genes could speed research on cancer, neurological diseases
6. NYU study reveals how brains immune system fights viral encephalitis
7. Stem cells from brain transformed to produce insulin at Stanford
8. Birds brains reveal source of songs
9. Loves all in the brain: fMRI study shows strong, lateralized reward, not sex, drive
10. Revolutionary nanotechnology illuminates brain cells at work
11. A puzzle piece found in unraveling the wiring of the brain
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: New brain hormone puts brakes reproduction

(Date:6/25/2015)... PRINCETON, N.J. , June 25, 2015  TAKE ... awarded a patent by the United States Patent and ... Data Standardization". This process leverages TAKE Solutions, Clinical Accelerators ... by over 50% (when compared to standardization without the ... At the heart ...
(Date:6/24/2015)... June 24, 2015  Synaptics Inc. (NASDAQ: ... solutions, today announced that Sharp has selected its ... authentication for its latest flagship smartphone device, the ... 200 million shipments of its fingerprint ID sensor ... strength, scalability and leadership in the biometrics market ...
(Date:6/23/2015)... MINNETONKA, Minn. , June 23, 2015 /PRNewswire/ ... technology company that supports the entire spectrum of ... iMedNet ™ , the company,s ... has been awarded a Silver 2015 Stevie® Award ... the Health Products & Services Website category.  The ...
Breaking Biology News(10 mins):TAKE Solutions Awarded Patent By USPTO 2Synaptics Brings Natural ID Technology to Sharp's Newest Flagship Smartphone 2MedNet Solutions' iMedNet eClinical Wins Silver Stevie Award 2
... The National Science Foundation has awarded Iowa State ... million grant to establish the NSF Engineering Research ... The award is part of the National ... Program. The third-generation Engineering Research Centers are designed ...
... utilize small, short-lived animals (insects, worms, mice) under ... parasites, superabundant food in the laboratory. Oddly ... such animals in their harsh, stressful natural environments. ... actually age much more slowly in captive luxury ...
... Bats, ability to echolocate may have evolved more than once, ... of London scientists. Species of bat with the ability ... tree of life - some are more related to their ... of whether echolocation in bats has evolved more than once, ...
Cached Biology News:Iowa State wins $18.5M grant to create NSF Center for Biorenewable Chemicals 2Iowa State wins $18.5M grant to create NSF Center for Biorenewable Chemicals 3Iowa State wins $18.5M grant to create NSF Center for Biorenewable Chemicals 4Old before their time? Aging in flies under natural vs. laboratory conditions 2Molecular evolution is echoed in bat ears 2
(Date:7/1/2015)... , ... July 01, 2015 , ... Apex Therapeutics announced ... International Convention in Philadelphia, PA. , The presentation took place on Tuesday, ... the plans for the development of APX3330 for the treatment of pancreatic cancer. ...
(Date:6/30/2015)... 2015 R-Japan Co.,Ltd. obtained the license of cell ... Medicine from the Ministry of Health, Labour and Welfare Kinki ... The fact that R- Japan ... from Pharmaceuticals and Medical Devices Agency (PMDA) on May 18, ... provide stem cell manufacturing service to medical institutions. As of ...
(Date:6/30/2015)... ... June 30, 2015 , ... ... a webinar to provide advanced scientific research into new classes of Nanoscale Graphene-based ... energy. Touted as 'the wonder material of the 21st Century' by the ...
(Date:6/30/2015)... Americord Registry, one of the fastest growing cord blood banks ... at Kirkland & Ellis LLP, as the newest member of ...   "We are thrilled about Andrew Horne,s ... , CEO of Americord. "He brings a wealth of knowledge ... growth and vision." Andrew Horne is ...
Breaking Biology Technology:Apex Therapeutics Presented Company Overview at This Year’s BIO International Convention in Philadelphia, PA 2R-Japan Obtained Autologous Stem Cell Manufacturing License from the Ministry of Health, Labour and Welfare 2How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 2How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 3How Graphene–based Nanomaterials and Films Revolutionize Science Explained in July 9 Webinar Hosted by Park Systems 4Americord Registry Announces Andrew Horne as Advisory Board Member 2
... Alliance, an,organization comprised of 12 of the nation,s best ... million Americans to exercise,their power over cancer by stepping ... Day through Father,s Day., The campaign, dubbed the ... activate Americans everywhere to take matters into their own,hands, ...
... Genaera,Corporation (Nasdaq: GENR ) today announced its financial ... for the quarter ended March 31,2008 was $4.3 million, or ... loss of $4.2 million, or $(0.24) per basic and diluted ... and development expenses for the quarter ended March,31, 2008 were ...
... ,Shire plc (LSE: SHP, NASDAQ: SHPGY), the global ... scheme of,arrangement proposed in a circular to shareholders ... a meeting convened by the Court and,held today., ... 2008, the High Court is expected to,approve the ...
Cached Biology Technology:Moffitt Cancer Center Joins National Campaign To Implore Americans To Donate $1 To Accelerate Cancer Research 2Genaera Corporation Announces First Quarter Financial Results 2Genaera Corporation Announces First Quarter Financial Results 3Genaera Corporation Announces First Quarter Financial Results 4Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 2Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 3Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 4Results of Court Meeting and Extraordinary General Meeting - Shareholders Approve Scheme of Arrangement and New Share Plans 5
... is the most thoroughly characterized enzyme available ... its overall utility and efficacy. , Its ... PCR applications. , It is QC ... AmpliTaq DNA Polymerase is a 94 kDa ...
Taq DNA Polymerase (T. aquaticus), 4 x 250 units. For PCR and other procedures requiring DNA polymerase activity at elevated temperatures. Category: Nucleotides & Enzymes & Biochemicals, Modifying En...
... DNA Polymerase is a versatile and easy-to ... PCR applications. GCpro Taq DNA Polymerase is ... E. coli, containing the DNA polymerase I ... a highly processive 5'-3' DNA polymerase activity. ...
Aspergillus (IgG) Ab EIA Sample Size: 100 l...
Biology Products: