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Glucocorticoid plays key role in skin abnormalities induced by psychological stress
December 01, 2006Inhibiting glucocorticoid, a type of steroid, can prevent skin abnormalities induced by psychological stress, according to a new study from the December issue of the American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. The new study also shows how psychological stress induces skin abnormalities that could initiate or worsen skin disorders such as psoriasis and atopic dermatitis.
The study, "Glucocorticoid blockade reverses psychological stress-induced abnormalities in epidermal structure and function," was carried out by Eung-Ho Choi, Marianne Demerjian, Debra Crumrine, Barbara E. Brown, Theodora Mauro, Peter M. Elias and Kenneth R. Feingold of the Veterans Affairs Medical Center, San Francisco and the University of California at San Francisco. Choi is also associated with Yonsei University Wonju College of Medicine, Wonju, Korea. The American Physiological Society published the study.
Previous research has shown that psychological stress increases glucocorticoid production. In addition, it is well recognized that psychological stress adversely affects many skin disorders, including psoriasis and atopic dermatitis.
"In this study, we showed that the increase in glucocorticoids induced by psychological stress induces abnormalities in skin structure and function, which could exacerbate skin diseases," Feingold explained. This provides a link for understanding how psychological stress can adversely affect skin disorders. Blocking the production or action of glucocorticoids prevented the skin abnormalities induced by psychological stress.
Skin protects
The skin is the body's largest organ and plays a crucial role in providing a barrier between the environment and the internal organs. It protects us from harmful microorganisms, ultraviolet light, toxic chemicals, and more. However, its most important function is providing a permeability barrier that prevents us from drying out. We are approximately 65 percent water and we are able to survive and function in dry environments because the skin forms a permeability barrier that prevents the loss of water.
The permeability barrier is located in the outermost layer of the epidermis, the stratum corneum. The stratum corneum is composed of dead cells surrounded by lipid membranes which mediate the permeability barrier. The stratum corneum layer continuously sloughs off, and therefore must be regenerated. The epidermal cells in the lower epidermis are continuously proliferating to provide new cells, which then differentiate, and ultimately die, to form the stratum corneum.
Previous studies have shown that psychological stress disturbs this elegantly balanced system by decreasing epidermal cell proliferation and inhibiting differentiation. Additionally, permeability barrier function is impaired. The researchers hypothesized that the increase in glucocorticoids induced by psychological stress would cause these adverse effects on skin function.
Study with hairless mice
They tested their hypothesis by subjecting hairless mice to stress while either blocking the production of glucocorticoids or preventing them from acting on the body. The stress was created by placing the mice in small cages in constant light with a radio playing for 48 hours.
Before placing the mice in the stressful situation, the researchers treated one group of mice with RU 486, a substance that blocks the action of glucocorticoids.
A second group of mice received antalarmin, which blocks glucocorticoid production. A third group was subjected to the stress but received neither antalarmin nor RU 486. The fourth group, the control group, remained unstressed in ordinary cages and without the continuous light and sound to which the other groups were exposed.
Results confirm hypothesis
The stressed mice that received RU 486 and antalarmin showed significantly better skin function compared to the stressed mice that did not receive either treatment. The treated mice showed significantly better:
- proliferation
- differentiation
- permeability barrier function
- stratum corneum integrity
The experiment demonstrated the important role that glucocorticoids play in inducing the skin abnormalities brought on by psychological stress. While the researchers hope the study will lead to a way to treat people who suffer these skin conditions, there is still a long way to go: First, the research was done with mice, not people. Second, there may be serious side effects of modulating glucocorticoid activity. Glucocorticoids are essential hormones that play many important roles. Blocking the action of glucocorticoids could have negative outcomes that are much worse than exacerbations in the skin disorders.
The research team is now looking at the effect of psychological stress on the skin's production of antimicrobial peptides, which play a role in defense against infection. They hypothesize that psychological stress might also reduce the ability of the skin to protect from infections.
American Physiological Society
"In this study, we showed that the increase in glucocorticoids induced by psychological stress induces abnormalities in skin structure and function, which could exacerbate skin diseases," Feingold explained. This provides a link for understanding how psychological stress can adversely affect skin disorders. Blocking the production or action of glucocorticoids prevented the skin abnormalities induced by psychological stress.
Skin protects
The skin is the body's largest organ and plays a crucial role in providing a barrier between the environment and the internal organs. It protects us from harmful microorganisms, ultraviolet light, toxic chemicals, and more. However, its most important function is providing a permeability barrier that prevents us from drying out. We are approximately 65 percent water and we are able to survive and function in dry environments because the skin forms a permeability barrier that prevents the loss of water.
The permeability barrier is located in the outermost layer of the epidermis, the stratum corneum. The stratum corneum is composed of dead cells surrounded by lipid membranes which mediate the permeability barrier. The stratum corneum layer continuously sloughs off, and therefore must be regenerated. The epidermal cells in the lower epidermis are continuously proliferating to provide new cells, which then differentiate, and ultimately die, to form the stratum corneum.
Previous studies have shown that psychological stress disturbs this elegantly balanced system by decreasing epidermal cell proliferation and inhibiting differentiation. Additionally, permeability barrier function is impaired. The researchers hypothesized that the increase in glucocorticoids induced by psychological stress would cause these adverse effects on skin function.
Study with hairless mice
They tested their hypothesis by subjecting hairless mice to stress while either blocking the production of glucocorticoids or preventing them from acting on the body. The stress was created by placing the mice in small cages in constant light with a radio playing for 48 hours.
Before placing the mice in the stressful situation, the researchers treated one group of mice with RU 486, a substance that blocks the action of glucocorticoids.
A second group of mice received antalarmin, which blocks glucocorticoid production. A third group was subjected to the stress but received neither antalarmin nor RU 486. The fourth group, the control group, remained unstressed in ordinary cages and without the continuous light and sound to which the other groups were exposed.
Results confirm hypothesis
The stressed mice that received RU 486 and antalarmin showed significantly better skin function compared to the stressed mice that did not receive either treatment. The treated mice showed significantly better:
- proliferation
- differentiation
- permeability barrier function
- stratum corneum integrity
The experiment demonstrated the important role that glucocorticoids play in inducing the skin abnormalities brought on by psychological stress. While the researchers hope the study will lead to a way to treat people who suffer these skin conditions, there is still a long way to go: First, the research was done with mice, not people. Second, there may be serious side effects of modulating glucocorticoid activity. Glucocorticoids are essential hormones that play many important roles. Blocking the action of glucocorticoids could have negative outcomes that are much worse than exacerbations in the skin disorders.
The research team is now looking at the effect of psychological stress on the skin's production of antimicrobial peptides, which play a role in defense against infection. They hypothesize that psychological stress might also reduce the ability of the skin to protect from infections.
American Physiological Society
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Treatment with a glucocorticoid medication, either alone or in combination with Ginkgo biloba, appears to significantly improve the sense of smell in individuals with previous olfactory loss due to upper respiratory infections.
UTMB study identifies women at risk of gaining excessive weight with injectable birth control
Researchers at the University of Texas Medical Branch at Galveston have identified women who are likely to gain weight while using depot medroxyprogesterone acetate, more commonly known as Depo-Provera or the birth control shot.
LSUHSC shows for first time infant inhalation of ultrafine air pollution linked to adult lung disease
Stephania Cormier, Ph.D., Associate Professor of Pharmacology at LSU Health Sciences Center New Orleans, has shown for the first time that early exposure to environmentally persistent free radicals (present in airborne ultrafine particulate matter) affects long-term lung function.
Stress puts double whammy on reproductive system, fertility
University of California, Berkeley, researchers have found what they think is a critical and, until now, missing piece of the puzzle about how stress causes sexual dysfunction and infertility.
New mouse model of depression/anxiety enhances understanding of antidepressant drugs
A recent study finds that the antidepressant effects of drugs like Prozac involve both neurogenesis-dependent and -independent mechanisms, a finding that may lead to development of better treatments for depression and anxiety.
Scatological clues lead to an intimate view
The guys were all stressed out. There were new infants in the community, and the guys knew from experience that that's when invaders were likely to come and kill the babies, particularly the male infants.
Cortisol and fatty liver: Researchers find cause of severe metabolic disorders
A healthy body stores fat in the form of so-called triglycerides in specialized fatty tissue as an energy reserve. Under certain conditions the delicate balance of the lipid metabolism gets out of control and fat is accumulated in the liver, leading to the dreaded fatty liver.
Physical and sexual abuse linked to asthma in Puerto Rican kids
Children who are physically or sexually abused are more than twice as likely to have asthma as their peers, according to a recent study of urban children in Puerto Rico. In fact, physical and sexual abuse was second only to maternal asthma in all the risk factors tested, including paternal asthma and indicators of socioeconomic status.
Breathe deep: Which patients could benefit from inhaled steroids in cystic fibrosis?
A specific variation in the glucocorticoid receptor gene is associated with lung disease progression in cystic fibrosis, research published this week in the online open access journal Respiratory Research reveals.
Blood pressure drug curbs brain damage from PTSD
A drug used to treat high blood pressure and enlargement of the prostate may protect the brain from damage caused by post-traumatic stress disorder, Alzheimer's disease, depression and schizophrenia.
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