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 August 1, 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 August 1, 2014).

Share This




More Health & Medicine News

Friday, August 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

House Republicans Vote to Sue Obama Over Healthcare Law

House Republicans Vote to Sue Obama Over Healthcare Law

Reuters - US Online Video (July 31, 2014) The Republican-led House of Representatives votes to sue President Obama, accusing him of overstepping his executive authority in making changes to the Affordable Care Act. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Despite Health Questions, E-Cigs Are Beneficial: Study

Despite Health Questions, E-Cigs Are Beneficial: Study

Newsy (July 31, 2014) Citing 81 previous studies, new research out of London suggests the benefits of smoking e-cigarettes instead of regular ones outweighs the risks. Video provided by Newsy
Powered by NewsLook.com
Dangerous Bacteria Kills One in Florida

Dangerous Bacteria Kills One in Florida

AP (July 31, 2014) Sarasota County, Florida health officials have issued a warning against eating raw oysters and exposing open wounds to coastal and inland waters after a dangerous bacteria killed one person and made another sick. (July 31) Video provided by AP
Powered by NewsLook.com
Health Insurers' Profits Slide

Health Insurers' Profits Slide

Reuters - Business Video Online (July 30, 2014) Obamacare-related costs were said to be behind the profit plunge at Wellpoint and Humana, but Wellpoint sees the new exchanges boosting its earnings for the full year. Fred Katayama reports. Video provided by Reuters
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