Featured Research

from universities, journals, and other organizations

Stress Delays Puberty, Dutch Researchers Find

Date:
June 8, 2001
Source:
Netherlands Organization For Scientific Research
Summary:
NWO research at Utrecht University has shown that when carp are subjected to stress, the development of their genital organs is delayed, so that they reach puberty later. It is likely that the stress hormone cortisol plays a major role in delaying puberty.

NWO research at Utrecht University has shown that when carp are subjected to stress, the development of their genital organs is delayed, so that they reach puberty later. It is likely that the stress hormone cortisol plays a major role in delaying puberty.

Changes in water temperature produce stress in fish. Dimitri Consten of Utrecht University subjected carp to a rapid reduction in water temperature three times a week from 25C down to 14C. This led to delayed development of their reproductive cells and the fish reached puberty later than normal. The researchers assumed that the hormone cortisol, which is released when an animal is under stress, plays a major role in this. This assumption was confirmed by means of two tests. In one of them, the biologists ‘switched off’ the cortisol in the stressed fish. These animals then developed to puberty in the normal manner. In a second test, cortisol was administered to fish which were not subjected to stress. In these fish, puberty was delayed.

Cortisol would seem to affect the testes. It directly delays the development of reproductive cells into sperm cells. This slows the growth of the sexual organs and also the supply of steroids to the blood. During puberty, steroids from the testes ensure that the brain, the pituitary gland and testes develop properly. Because the cortisol produced under stress reduces the supply of steroids, communication to the brain and the pituitary (a gland under the brain) is reduced. This means that, like the testes, these organs develop more slowly, thus slowing down overall development.

The whole complex of hormones involved in puberty is self-regulatory. The brain produces the gonadotropin-releasing hormone, which stimulates cells in the pituitary. On order, the pituitary then excretes the gonadotropins, the luteinising hormone and the hormone which stimulates the follicles. In the testes, the gonadotropins promote the production of reproductive cells and steroid hormones. The steroid hormones contribute to the production of the reproductive cells and ensure communication between the brain and the pituitary gland, thus completing the cycle.


Story Source:

The above story is based on materials provided by Netherlands Organization For Scientific Research. Note: Materials may be edited for content and length.


Cite This Page:

Netherlands Organization For Scientific Research. "Stress Delays Puberty, Dutch Researchers Find." ScienceDaily. ScienceDaily, 8 June 2001. <www.sciencedaily.com/releases/2001/06/010605072234.htm>.
Netherlands Organization For Scientific Research. (2001, June 8). Stress Delays Puberty, Dutch Researchers Find. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2001/06/010605072234.htm
Netherlands Organization For Scientific Research. "Stress Delays Puberty, Dutch Researchers Find." ScienceDaily. www.sciencedaily.com/releases/2001/06/010605072234.htm (accessed July 29, 2014).

Share This




More Health & Medicine News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Ebola Virus Threatens West Africa

Deadly Ebola Virus Threatens West Africa

AP (July 28, 2014) West African nations and international health organizations are working to contain the largest Ebola outbreak in history. It's one of the deadliest diseases known to man, but the CDC says it's unlikely to spread in the U.S. (July 28) Video provided by AP
Powered by NewsLook.com
$15B Deal on Vets' Health Care Reached

$15B Deal on Vets' Health Care Reached

AP (July 28, 2014) A bipartisan deal to improve veterans health care would authorize at least $15 billion in emergency spending to fix a veterans program scandalized by long patient wait times and falsified records. (July 28) Video provided by AP
Powered by NewsLook.com
Two Americans Contract Ebola in Liberia

Two Americans Contract Ebola in Liberia

Reuters - US Online Video (July 28, 2014) Two American aid workers in Liberia test positive for Ebola while working to combat the deadliest outbreak of the virus ever. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Traditional African Dishes Teach Healthy Eating

Traditional African Dishes Teach Healthy Eating

AP (July 28, 2014) Classes are being offered nationwide to encourage African Americans to learn about cooking fresh foods based on traditional African cuisine. The program is trying to combat obesity, heart disease and other ailments often linked to diet. (July 28) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins