Navigation Links
Sex Ends as Seasons Shift and Kisspeptin Levels Plummet

A hormone implicated in the onset of human puberty also appears to control reproductive activity in seasonally breeding rodents, report Indiana University Bloomington and// University of California at Berkeley scientists in the issue of Endocrinology. The paper is now accessible online via the journal's rapid electronic publication service.

The researchers present evidence that kisspeptin, a recently discovered neuropeptide encoded by the KiSS-1 gene, mediates the decline of male Siberian hamsters' libido and reproduction as winter approaches and daylight hours wane.

"Ours isn't the first study to link the peptide to reproduction, but it is the first to connect kisspeptin to how animals interpret seasonal cues, including day length," said IUB biologist Gregory Demas. "Kisspeptin likely plays an integral role in coordinating seasonal reproduction in a wide range of animals."

Kisspeptin joins a select few proteins believed to act as switches that connect environmental changes to a physiological response.

"This peptide is poised to act as an integrator of environmental information to allow for the optimal neuroendocrine control of reproduction in vertebrates, including humans," said UC Berkeley neuroscientist Lance Kriegsfeld. "In humans and other species, if the environment is not satisfactory, sex drive will decline; kisspeptin is likely part of the pathway responsible for this regulation."

The scientists divided a population of male Siberian hamsters (Phodopus sungorus) into treatment groups: those housed in long, summer-like photoperiods and those in short, winter-like photoperiods. In a separate experiment hamsters were also treated with exogenous injections of kisspeptin after eight weeks of either short- or long-day photoperiod exposure. At the conclusion of the experimental period, scientists analyzed the hamsters' reproductive system status, blood levels of reproductive hormones, as well as the nu
'"/>




Page: 1 2 3

Related medicine news :

1. Biocon To Shift Focus On Innovation To Accelerate Growth
2. Govt to Shift its Focus From Curative to Preventive Mode of Healthcare
3. Doctors Advise Shifting of Ailing Soren
4. Levels Of Blood Proteins May Help Heart Disease Care
5. Elevated Ozone Levels Hurt Sperm Count
6. Elevating Manganese Levels hold back HIV
7. High Levels of Protein Linked to Brain Shrinkage
8. Chickens Found To Have High Levels of Arsenic
9. Low Protein Levels A Possible Indicator For A Miscarriage
10. Low Testosterone Levels the Cause Of Depression In Men
11. Weather Found To Play An Important Role In Cholesterol Levels
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Sex Ends Seasons Shift and Kisspeptin Levels Plummet

(Date:10/22/2014)... Steven Reinberg HealthDay Reporter ... quickly add weight and length may be showing a genetic ... In adults, certain genes have been linked to increased body ... in fat and lean muscle, the researchers said. At ... taller. By ages 2 and 3, however, these genes were ...
(Date:10/22/2014)... By Tara Haelle ... -- Binge drinking among young adult men may lead to ... binge drinking didn,t cause a similar rise in blood pressure ... study. In fact, when young adult women drank lightly or ... half, the study found. "This finding parallels studies in ...
(Date:10/22/2014)... HealthDay Reporter , MONDAY, Oct. ... officially tightened guidelines for health workers treating Ebola patients, now ... of a respirator at all times. The U.S. Centers ... rules after two Dallas nurses contracted Ebola while caring for ... national Thomas Eric Duncan. Nina Pham is currently being treated ...
(Date:10/20/2014)... October 20, 2014 With a mere ... Charlie Crist made a brief fundraising stop at the ... Thursday. , Fresh from a debate last night with ... the stage for the first seven minutes because Crist ... governor described the incident in one word: "weird." , ...
(Date:10/20/2014)... (PRWEB) October 20, 2014 ASCNYC ... organization that helps New Yorkers living with HIV/AIDS ... toward health, housing, recovery and self-sufficiency. Each year, ... the local community through their tireless efforts. , ... Marc Shapses , has been selected as this ...
Breaking Medicine News(10 mins):Health News:Tall, Heavy 1-Year-Olds May Be at Risk for Obesity Later, Study Finds 2Health News:Binge Drinking May Boost Blood Pressure in Young Men 2Health News:Binge Drinking May Boost Blood Pressure in Young Men 3Health News:Binge Drinking May Boost Blood Pressure in Young Men 4Health News:CDC Tightens Rules on Caring for Ebola Patients 2Health News:CDC Tightens Rules on Caring for Ebola Patients 3Health News:At Crist Fundraiser, Dan Newlin Says, "No More Robert Germans," Will Seek Changes to Florida Missing Persons Law 2Health News:At Crist Fundraiser, Dan Newlin Says, "No More Robert Germans," Will Seek Changes to Florida Missing Persons Law 3Health News:Savills Studley's Marc Shapses To Be Honored as 2014 "Positive Changemaker" by ASCNYC 2Health News:Savills Studley's Marc Shapses To Be Honored as 2014 "Positive Changemaker" by ASCNYC 3
... as medication rid brain of matted protein, researchers say , , ... aims to reduce the clogging "tangles" in the brain cells ... researchers report. , Further studies are necessary to confirm whether ... seems, or whether it needs to be given as part ...
... Former U.S. Surgeon General,Julius B. Richmond, MD, FAAP, a ... Sunday, July 27, 2008, of,cancer at his home near ... President Carter,s Assistant Secretary for,Health and as U.S. Surgeon ... reinvigorated tobacco control efforts through the release of,the 1979 ...
... Md., July 29 Sanaria Inc., a,privately ... University of,Maryland Biotechnology Institute (UMBI) announced the ... (SBIR) Grant from the,National Institute of Allergy ... of Health. The grant will support research ...
... Genomma Lab,Internacional, S.A.B. de C.V. (BMV: LAB) ("Genomma" ... personal care products,company announced yesterday that it had ... UNIGASTROZOL, from Unipharm de Mexico, S.A. de,C.V. This ... control of,gastrointestinal symptoms that are produced by excessive ...
... safety, reliable results , , TUESDAY, July 29 (HealthDay News) ... cancer care and research, but most tests aren,t administered ... Medical Center researchers. , In cancer care, exercise tests ... cancer patients. In cancer research, exercise tests are most ...
... Corporate Officer of Gillette, brings 38 years of ... experience in consumer products industry, CHICAGO, ... announced today that Peter Klein has joined the,firm as a ... the global consumer products,industry and was most recently senior vice ...
Cached Medicine News:Health News:'De-Tangling' Alzheimer's Drug Shows Promise 2Health News:'De-Tangling' Alzheimer's Drug Shows Promise 3Health News:'De-Tangling' Alzheimer's Drug Shows Promise 4Health News:Former U.S. Surgeon General Julius B. Richmond, 91 2Health News:Former U.S. Surgeon General Julius B. Richmond, 91 3Health News:Malaria Vaccine Developer Sanaria Inc. and the University of Maryland Biotechnology Institute Awarded Collaborative, Multi-Year, US $600,000 NIH Phase I Small Business Innovation Research Grant 2Health News:Malaria Vaccine Developer Sanaria Inc. and the University of Maryland Biotechnology Institute Awarded Collaborative, Multi-Year, US $600,000 NIH Phase I Small Business Innovation Research Grant 3Health News:Genomma Lab Internacional Acquires UNIGASTROZOL 2Health News:Exercise Testing for Cancer Fails to Follow Guidelines 2Health News:The Cambridge Group Names Peter Klein a Director 2
(Date:10/22/2014)... RPh, of Vernak Farms Pharmacy in Skaneateles, ... Roentsch Scholarship by the Professional Compounding Centers of America ... during PCCA,s International Seminar, held October 8-10, ... pharmacist and PCCA member who embodies the innovative and ... pharmacist in the compounding community. George ...
(Date:10/22/2014)... Calif. , Oct. 22, 2014  Paper ... products, has developed APLS ® Body Guard ... minimizes the spread of bacteria and virus while ... APLS Body Guard Bio features a rugged, external ... edges that create a leak-proof inner chamber that ...
(Date:10/22/2014)... 22, 2014  CryoLife, Inc. (NYSE: CRY ... focused on cardiac and vascular surgery, announced today that ... Executive Officer, has been elected to the Company,s Board ... Steven G. Anderson , Executive Chairman of CryoLife, stated, "Since ... be an excellent leader who is well positioned to ...
Breaking Medicine Technology:PCCA Awards Charlene Vernak, RPh, the George Roentsch Scholarship 2New, State-Of-The-Art Body Bag Minimizes The Spread Of Bacteria And Virus 2Pat Mackin Joins CryoLife Board of Directors 2Pat Mackin Joins CryoLife Board of Directors 3
... 2011 For the second year in a row Royce ... Associates, received a supplier recognition from Carestream Health, the world,s ... Carestream Health, which supplies a complete line of Medical and ... Royce their 2010 Supplier of the Year , Carestream,s ...
... 2011 Transgenomic, Inc. (OTC/BB: TBIO) today reported financial results for ... update. First Quarter Financial Results ... $7.5 million, an increase of 37 percent compared with $5.4 million ... or 56 percent of net sales, compared with gross profit of ...
Cached Medicine Technology:Royce Receives Coveted Medical Products Award 2Transgenomic Reports First Quarter Financial Results 2Transgenomic Reports First Quarter Financial Results 3Transgenomic Reports First Quarter Financial Results 4Transgenomic Reports First Quarter Financial Results 5Transgenomic Reports First Quarter Financial Results 6Transgenomic Reports First Quarter Financial Results 7Transgenomic Reports First Quarter Financial Results 8Transgenomic Reports First Quarter Financial Results 9
... Featuring an expanded database containing over ... identification cards, VITEK 2 Compact offers ... amount of time (2 to 14 ... of microorganisms that contaminate production areas ...
... transmitting data from multiple sources is ... Dawnings ResultNet/Plus software allows you to ... your communications network., ,ResultNet/Plus eliminates the ... from largescale or multi-site laboratories to ...
... Software is a powerful Java-based interface ... to control laboratory instrument connections and ... used in two applications: embedded in ... on a network PC station. Within ...
Powerful LED Illumination , The ultrabright and compact 3S LED HeadLight from HEINE for Powerful, coaxial illumination...
Medicine Products: