HOME >> BIOLOGY >> NEWS
Sex ends as seasons shift and kisspeptin levels plummet

BLOOMINGTON, Ind. -- 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 March 2007 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 h
'"/>

Contact: David Bricker
brickerd@indiana.edu
812-856-9035
Indiana University
28-Dec-2006


Page: 1 2 3

Related biology news :

1. A water tale for all seasons: When it comes to hydration and exercise, the system works
2. Increase in creeping vines signals major shift in southern US forests
3. Competition, loss of selfishness mark shift to supersociety
4. Prehistoric remains reveal a drastic shift in northern fur seal ecology
5. DNA analysis reveals rapid population shift among Pleistocene cave bears
6. Antarctic warming to reduce animals at base of ecosystem, shift some penguin populations southward
7. Dramatic shift from simple to complex marine ecosystems occurred 250M years ago at mass extinction
8. Pressured by predators, lizards see rapid shift in natural selection
9. Why our shifty eyes dont drive us crazy
10. Dinosaurs climate shifted too, reports show
11. Researcher predicts paradigm shift in heart disease treatment

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/22/2017)... March 21, 2017 Optimove , ... by retailers such as 1-800-Flowers and AdoreMe, today ... Recommendations and Replenishment. Using Optimove,s machine learning algorithms, ... product and replenishment recommendations to their customers based ... predictions of customer intent drawn from a complex ...
(Date:3/16/2017)... CeBIT 2017 - Against identity fraud with DERMALOG solutions "Made in ... ... combined in one project, multi-biometric solutions provide a crucial contribution against identity fraud. (PRNewsFoto/Dermalog Identification ... Used combined in one project, multi-biometric solutions provide a ... ...
(Date:3/7/2017)... Brandwatch , the leading social intelligence company, today announces that it ... insights to support its reporting, help direct future campaigns, and share ... charity will be using Brandwatch Analytics social listening and analytics technology ... the topics and issues that are a priority for its supporters. ... "Until recently we,ve ...
Breaking Biology News(10 mins):
(Date:3/23/2017)... -- In today,s pre-market research, Stock-Callers.com takes ... industry: Sangamo Therapeutics Inc. (NASDAQ: SGMO), Eyegate Pharmaceuticals Inc. ... Regulus Therapeutics Inc. (NASDAQ: RGLS ). On ... rating on Pharmaceuticals/Biotechnology to "Overweight" from "Market Weight." Learn more about ... ...
(Date:3/22/2017)... 2017  UBM and the Massachusetts Medical Device ... partnership and the third annual Massachusetts Medtech Week. Massachusetts ... st Annual MassMEDIC Conference held in conjunction ... 2017. MassMEDIC will feature a ... and CEO, Scott Whitaker , at its ...
(Date:3/22/2017)... PALM BEACH, Florida , March 22, 2017 ... ... management for various cancer conditions are being pressured as of ... pain therapy for cancer pain management has a dramatic impact ... ramp up research and development activities for identifying new forms ...
(Date:3/22/2017)... ... March 21, 2017 , ... Okyanos Cell Therapy has announced Tallahassee, ... their live events series, “Stem Cell Therapy: The Next Phase in the Evolution of ... Stem Cell Research and Therapy Act, Okyanos maintains a mission to help ...
Breaking Biology Technology:
Cached News: