Featured Research

from universities, journals, and other organizations

Skin has an internal clock

Date:
July 19, 2012
Source:
Charité - Universitätsmedizin Berlin
Summary:
Human skin has an internal clock responsible for the time-based steering of its repair and regeneration, among other things. Our skin is one of the body’s essential organs and perhaps the most versatile: Besides representative, communicative and sensory functions, it serves as our body’s boundary to the environment, forms an active and passive barrier against germs and helps keeping conditions constant for other important systems of the body, even though environmental conditions can change drastically. Frost, heat, sunlight and moisture — a variety of challenges for our skin — have different effects depending on the time of day.

A research team at Charité – Universitätsmedizin Berlin together with scientists at a company in Hamburg has now discovered that human skin has an internal clock responsible for the time-based steering of its repair and regeneration, among other things.

Related Articles


The team published its first results from their basic research in the current issue of Proceedings of the National Academy of Sciences (PNAS).

Our skin is one of the body’s essential organs and perhaps the most versatile: Besides representative, communicative and sensory functions, it serves as our body’s boundary to the environment, forms an active and passive barrier against germs and helps keeping conditions constant for other important systems of the body, even though environmental conditions can change drastically. Frost, heat, sunlight and moisture — a variety of challenges for our skin — have different effects depending on the time of day.

Prof. Achim Kramer’s research team from the field of chronological biology at Charité and Dr. Thomas Blatt from the Skin Research Center in Hamburg have now found out that skin adapts to these time-dependent conditions.

The researchers took cell samples (keratinocytes) from the uppermost layer of skin from young, healthy test persons at various times of the day. Analysis of numerous genes in the keratinocytes showed that important factors for the regeneration and repair of skin cells are regulated by a biological clock. One of these factors, the molecule called the Krüppel-like-factor (Klf9) slows down cell division in the keratinocytes: When the researchers reduced the activity of this factor, they observed faster growth in the skin cell cultures. On the other hand, increased activity of Klf9 was connected with slower cell division. At the same time, it was shown that the stress hormone cortisol also controls the activity of Klf9 and can thus deploy a medical effect on common skin diseases like psoriasis.

The job of the biological clock is to control the exact timing of various processes like cell division, cell differentiation and DNA repair in skin. Prof. Kramer is already looking to the future: “If we understand these processes better, we could target the use of medication to the time of day in which they work best and have the fewest side effects.”


Story Source:

The above story is based on materials provided by Charité - Universitätsmedizin Berlin. Note: Materials may be edited for content and length.


Journal Reference:

  1. F. Sporl, S. Korge, K. Jurchott, M. Wunderskirchner, K. Schellenberg, S. Heins, A. Specht, C. Stoll, R. Klemz, B. Maier, H. Wenck, A. Schrader, D. Kunz, T. Blatt, A. Kramer. Kruppel-like factor 9 is a circadian transcription factor in human epidermis that controls proliferation of keratinocytes. Proceedings of the National Academy of Sciences, 2012; 109 (27): 10903 DOI: 10.1073/pnas.1118641109

Cite This Page:

Charité - Universitätsmedizin Berlin. "Skin has an internal clock." ScienceDaily. ScienceDaily, 19 July 2012. <www.sciencedaily.com/releases/2012/07/120719103608.htm>.
Charité - Universitätsmedizin Berlin. (2012, July 19). Skin has an internal clock. ScienceDaily. Retrieved December 18, 2014 from www.sciencedaily.com/releases/2012/07/120719103608.htm
Charité - Universitätsmedizin Berlin. "Skin has an internal clock." ScienceDaily. www.sciencedaily.com/releases/2012/07/120719103608.htm (accessed December 18, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Thursday, December 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Kids Die While Under Protective Services

Kids Die While Under Protective Services

AP (Dec. 18, 2014) — As part of a six-month investigation of child maltreatment deaths, the AP found that hundreds of deaths from horrific abuse and neglect could have been prevented. AP's Haven Daley reports. (Dec. 18) Video provided by AP
Powered by NewsLook.com
UN: Up to One Million Facing Hunger in Ebola-Hit Countries

UN: Up to One Million Facing Hunger in Ebola-Hit Countries

AFP (Dec. 17, 2014) — Border closures, quarantines and crop losses in West African nations battling the Ebola virus could lead to as many as one million people going hungry, UN food agencies said on Wednesday. Duration: 00:52 Video provided by AFP
Powered by NewsLook.com
When You Lose Weight, This Is Where The Fat Goes

When You Lose Weight, This Is Where The Fat Goes

Newsy (Dec. 17, 2014) — Can fat disappear into thin air? New research finds that during weight loss, over 80 percent of a person's fat molecules escape through the lungs. Video provided by Newsy
Powered by NewsLook.com
Why Your Boss Should Let You Sleep In

Why Your Boss Should Let You Sleep In

Newsy (Dec. 17, 2014) — According to research out of the University of Pennsylvania, waking up for work is the biggest factor that causes Americans to lose sleep. 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:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

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