Featured Research

from universities, journals, and other organizations

Lack of omega-6 fatty acid linked to severe dermatitis

Date:
April 14, 2010
Source:
University of Illinois at Urbana-Champaign
Summary:
Scientists have learned that a specific omega-6 fatty acid may be critical to maintaining skin health.

University of Illinois scientists have learned that a specific omega-6 fatty acid may be critical to maintaining skin health.

"In experiments with mice, we knocked out a gene responsible for an enzyme that helps the body to make arachidonic acid. Without arachidonic acid, the mice developed severe ulcerative dermatitis. The animals were very itchy, they scratched themselves continuously, and they developed a lot of bleeding sores," said Manabu Nakamura, a U of I associate professor of food science and human nutrition.

When arachidonic acid was added to the animals' diet, the itching went away, he said.

Nakamura's team has been focusing on understanding the function of omega-3 and -6 fatty acids, and doctoral student Chad Stroud developed a mouse model to help them understand the physiological roles of these fats. By knocking out genes, they can create deficiencies of certain fats and learn about their functions.

"Knocking out a gene that enables the body to make the delta-6-desaturase enzyme has led to some surprising discoveries. In this instance, we learned that arachidonic acid is essential for healthy skin function. This new understanding may have implications for treating the flaky, itchy skin that sometimes develops without an attributable cause in infants," he said.

Nakamura explained that our bodies make arachidonic acid from linoleic acid, an essential fatty acid that we must obtain through our diets. It is found mainly in vegetable oils.

Scientists have long attributed healthy skin function to linoleic acid, which is important because it provides the lipids that coat the outer layer of the skin, keeping the body from losing water and energy, which would retard growth, the scientist said.

But skin function seems to be more complicated than that. These itchy mice had plenty of linoleic acid. They just couldn't convert it to arachidonic acid because the gene to make the necessary enzyme had been knocked out, he noted.

Arachidonic acid is also essential to the production of prostaglandins, compounds that can lead to inflammatory reactions and are important to immune function. Common painkillers like aspirin and ibuprofen work by inhibiting the conversion of arachidonic acid to prostaglandins.

"We usually think of inflammation as a bad thing, but in this case, prostaglandins prevented dermatitis, which is an inflammatory reaction. We measured prostaglandin levels in the animals' skin, and when we fed arachidonic acid to the knockout mice, they resumed making these important chemical compounds," he said.

Nakamura cautioned that there are still things they don't understand about the function of this omega-6 fatty acid. "This new knowledge is a starting point in understanding the mechanisms that are involved, and we need to do more research at the cellular level."

The study was published in a recent issue of the Journal of Lipid Research. Co-authors are Chad K. Stroud, Takayuki Y. Nara, Manuel Roqueta-Rivera, Emily C. Radlowski, Byung H. Cho, Mariangela Segre, Rex A. Hess, and Wanda M. Haschek, all of the U of I, and Peter Lawrence, Ying Zhang, and J. Thomas Brenna of Cornell University. Funding was provided in part by a USDA National Needs Fellowship Award and a grant from the National Institutes of Health.


Story Source:

The above story is based on materials provided by University of Illinois at Urbana-Champaign. Note: Materials may be edited for content and length.


Journal Reference:

  1. Stroud et al. Disruption of FADS2 gene in mice impairs male reproduction and causes dermal and intestinal ulceration. The Journal of Lipid Research, 2009; 50 (9): 1870 DOI: 10.1194/jlr.M900039-JLR200

Cite This Page:

University of Illinois at Urbana-Champaign. "Lack of omega-6 fatty acid linked to severe dermatitis." ScienceDaily. ScienceDaily, 14 April 2010. <www.sciencedaily.com/releases/2010/04/100412121022.htm>.
University of Illinois at Urbana-Champaign. (2010, April 14). Lack of omega-6 fatty acid linked to severe dermatitis. ScienceDaily. Retrieved April 17, 2014 from www.sciencedaily.com/releases/2010/04/100412121022.htm
University of Illinois at Urbana-Champaign. "Lack of omega-6 fatty acid linked to severe dermatitis." ScienceDaily. www.sciencedaily.com/releases/2010/04/100412121022.htm (accessed April 17, 2014).

Share This



More Health & Medicine News

Thursday, April 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Could Even Casual Marijuana Use Alter Your Brain?

Could Even Casual Marijuana Use Alter Your Brain?

Newsy (Apr. 16, 2014) A new study conducted by researchers at Northwestern and Harvard suggests even casual marijuana use can alter your brain. Video provided by Newsy
Powered by NewsLook.com
Thousands Of Vials Of SARS Virus Go Missing

Thousands Of Vials Of SARS Virus Go Missing

Newsy (Apr. 16, 2014) A research institute in Paris somehow misplaced more than 2,000 vials of the deadly SARS virus. Video provided by Newsy
Powered by NewsLook.com
Formerly Conjoined Twins Released From Dallas Hospital

Formerly Conjoined Twins Released From Dallas Hospital

Newsy (Apr. 16, 2014) Conjoined twins Emmett and Owen Ezell were separated by doctors in August. Now, nearly nine months later, they're being released from the hospital. Video provided by Newsy
Powered by NewsLook.com
Ebola Outbreak Now Linked To 121 Deaths

Ebola Outbreak Now Linked To 121 Deaths

Newsy (Apr. 15, 2014) The ebola virus outbreak in West Africa is now linked to 121 deaths. Health officials fear the virus will continue to spread in urban areas. Video provided by Newsy
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