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Stress and the Skin: A Meeting Report of the Weill Cornell Symposium on the Science of Dermatology

2006; Elsevier BV; Volume: 126; Issue: 12 Linguagem: Inglês

10.1038/sj.jid.5700565

1523-1747

Maria Colavincenzo, Richard D. Granstein,

Adrenal Hormones and Disorders

Experts from around the world gathered for the Weill Cornell Symposium on the Science of Dermatology, *The Weill Cornell Symposium on the Science of Dermatology was held at Weill Medical College of Cornell University, New York, New York, USA, 2–4 June 2006.*The Weill Cornell Symposium on the Science of Dermatology was held at Weill Medical College of Cornell University, New York, New York, USA, 2–4 June 2006. which explored the physiological manifestations of stress and its effects on skin, with three days of presentations and two poster sessions. Organized and introduced by Richard D. Granstein of the Weill Medical College of Cornell University (New York, NY), the conference began with discussions of the neuroanatomy of skin and mechanisms of cutaneous immunity and moved on to presentations on the modulation of cutaneous immunity by stress. Subsequently, presentations on stress effects on skin barrier function and wound healing were given. The conference concluded with discussions regarding the role of stress in several cutaneous diseases, including acne, psoriasis, atopic dermatitis, urticaria, hair disorders, and cancer. Some of the themes of the meeting are reported here; the abstracts from the meeting were published in the July issue (J Invest Dermatol 126: 1665–81, 2006). In the keynote presentation, Esther M. Sternberg of the National Institutes of Health (Bethesda, MD) discussed the definition of stress and mechanisms through which its effects are mediated, focusing on her work regarding the hypothalamic–pituitary axis. Overactivation of this axis, as occurs in chronic stress, leads to a state of relative immunosuppression related to the effects of glucocorticoids. A blunted hypothalamic–pituitary axis, however, has been associated with autoimmune and inflammatory disease, including systemic lupus erythematosus and atopic skin disease. Similarly, tissue resistance to glucocorticoids — resulting from abnormal glucocorticoid receptor function — is associated with autoimmune disease. That bacterial toxins can repress glucocorticoid receptors suggests new potential mechanisms from which these inflammatory aberrations might result. Dieter Metze of the University of Münster (Germany) presented a view of the neuroanatomy of skin, where the close contact of neural structures with various immune cells is one basis for an interaction of the nervous and cutaneous immune systems. Kevin D. Cooper of Case Western Reserve University (Cleveland, OH) discussed the extraordinary scope of this skin immune system, where multiple inputs into skin control of inflammation are derived from the neurocutaneous axis, creating a pathway for stress to modulate cutaneous immunity. Richard D. Granstein of the Weill Medical College of Cornell University (New York, NY) presented evidence that nerve-derived factors regulate antigen presentation by Langerhans cells in skin. Langerhans cells have been found to express receptors for several neuropeptides as well as adrenergic receptors, and exposure to some of these mediators leads to inhibition of antigen presentation and modification of cytokine expression. Doina Ganea of Temple University School of Medicine (Philadelphia, PA) provided further evidence of the potentially anti-inflammatory role of certain neuropeptides, demonstrating that vasoactive intestinal peptide (VIP) and pituitary adenylate cyclase-activating polypeptide (PACAP) contribute to the development of bone marrow-derived tolerogenic dendritic cells in vitro and in vivo. Other topics addressed in this section included the regulatory role of melanocortins in skin (Thomas Luger, University of Münster, Germany), the role of stress in mediating peripheral sensitization of nerve fibers (thereby affecting perception of pain and itch) (Sonja Ständer, University of Münster, Germany), the role of epidermal keratinocytes in cutaneous immune responses, and the effects of corticotropin-releasing hormone on mast cell-dependent vascular permeability (Theoharis C. Theoharides, Tufts University, Boston, MA). Melanie Flint (University of Pittsburgh, PA) discussed fascinating effects of restraint stress in mice on gene expression in T cells, indicating that stress activates genes responsible for priming the T cell to undergo either apoptosis or proliferation. Firdaus S. Dhabar of Stanford University (Stanford, CA) discussed the complex effects of stress on immunity and implications for cutaneous malignancies. Whereas acute stress can be immunoenhancing, chronic stress is generally immunosuppressive and increases susceptibility to skin cancer via suppression of T-helper 1-type cytokines, among other mechanisms. Ronald Glaser (Ohio State University, Columbus, OH) gave an overview of stress-induced immune dysfunction with a discussion of possible effects on cancer, heart disease, diabetes, wound healing, and the response to vaccination. George Maestroni (Cantonal Institute of Pathology, Locarno, Switzerland) discussed the regulatory role of catecholamines in cutaneous immunity, and Kristina Seiffert of Michigan State University (East Lansing, MI) discussed her complementary work on the inhibitory effects of catecholamines on Langerhans cell antigen presentation in vitro. Junichi Hosoi (Shiseido Life Science Research Center, Yokohama, Japan) discussed his work on the ability of odorants to regulate cutaneous immunity. Next addressed were the effects of stress on the barrier function of skin. Miroslav Blumenberg (New York University, New York, NY) gave an overview of the skin barrier. Margaret Altemus (Weill Medical College) discussed her studies on the role of chronic and acute stress in modulating recovery of skin barrier function after perturbation and elicitation of delayed-type hypersensitivity in humans. She found that acute stress seemed to impair barrier-function recovery and elicitation of delayed-type hypersensitivity, whereas chronic stress enhanced barrier-function recovery and delayed-type hypersensitivity expression. Kenneth Feingold of the San Francisco VA Medical Center (San Francisco, CA) discussed the negative effects of psychological stress and endogenous glucocorticoids on epidermal function and presented data showing that co-application of mixtures of key barrier lipids along with “liposensor” activators (a subclass of class II hormone receptors including peroxisome proliferator-activated receptors α, γ and β/δ and liver X receptor) could negate these adverse effects. The role of stress in modulating wound healing was then discussed. David Woodley of the University of Southern California (Los Angeles, CA) presented an overview of wound healing. Janice Kiecolt-Glaser (Ohio State University, Columbus, OH) presented results of several lines of investigation into the role of stress in wound healing. She and her collaborators have observed a delay in wound healing related to downregulation of the proinflammatory cytokines IL-8 and IL-1α, suggesting that stress can have a significant impact on the early stages of wound healing. In work related to the influence of psychological stress on wound healing, they found that both chronic and acute psychological stressors may impede normal wound healing in humans. Phillip Marucha (University of Illinois at Chicago, IL) presented findings suggesting a role for both the hypothalamic–pituitary axis and the sympathetic nervous system in stress-induced impairment of wound healing. Treatment of stressed mice with the glucocorticoid antagonist RU486 partially restored normal wound healing and ameliorated stress-induced cytokine downregulation. Further, investigations into stress-induced hypoxia have shown that the pO2 in wound tissue of stressed animals is 20% lower than in controls, with evidence of dysregulation of oxygen-modulated genes including a threefold upregulation of inducible nitric oxide synthase in wound tissue from stressed mice. Barbara Gilchrest (Boston University, MA) presented her work on the role of telomere shortening in skin aging and the ability of oxidative stress in acceleration of telomere shortening. The final portion of the meeting turned more toward the clinical, with speakers exploring the contribution of stress to various skin diseases. Christos Zouboulis of the Dessau Medical Center (Dessau, Germany) discussed the role of neuropeptides in acne and rosacea, in particular that of corticotropin-releasing hormone as a potential contributor to the development or exacerbation of these disorders. In the case of psoriasis, disease may be triggered by, and is itself a cause of, significant psychosocial stress; Christopher Griffiths of the University of Manchester (UK) presented data showing that psoriasis patients with high/pathological worry are less likely to clear on psoralen plus UVA and that cognitive behavioral therapy as an adjunct to traditional treatments may significantly improve response. Robin Wright (Harvard Medical School, Boston, MA) discussed the role of stress in the expression of atopic disorders, and Bert Garssen of the Centre for Psycho-oncology at the Helen Dowling Institute (Utrecht, the Netherlands) reviewed the evidence for and against a role for stress in the initiation or progression of cancer. Ralf Paus of University Hospital Schleswig-Holstein (Lübeck, Germany) discussed a mouse model for chronic stress (sonic stress) that demonstrated a profound inhibitory effect of stress on murine hair growth and presented evidence that human scalp hair follicles have a fully functional peripheral equivalent of the central hypothalamic–pituitary stress-response axis, including the ability to synthesize cortisol and the presence of characteristic regulatory feedback loops. Although the understanding of the functional roles of such intrafollicularly generated hormones and their relevance to alopecia is still in its early stages, locally generated neuroendocrine signals may be involved in maintaining the immune privilege of the anagen hair bulb, among many other specific functions, and further research is under way. The last oral presentation, by Madhulika Gupta (Schulich School of Medicine and Dentistry, London, Canada), reviewed the evidence that stress may play a clinically important role in various urticarial states. In addition to these oral presentations, meeting participants presented 29 posters describing cutting-edge work in each of the these areas. The symposium achieved its goal of bringing together scientists and clinicians working in various areas of stress-related cutaneous effects for an interchange of the latest results and information, allowing the participants to further advance their work from the knowledge gained at the meeting. Of course, the ultimate goal is to facilitate the creation of new knowledge that will allow the development of new and improved techniques to benefit our patients.