Vitiligo and epidermal microenvironment: possible involvement of keratinocyte-derived cytokines.
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Cytokines↗
Biomedical subjects
Giuseppe Hautmann
Publications and source records attributed to Giuseppe Hautmann.
New insights into the pathogenesis of vitiligo: imbalance of epidermal cytokines at sites of lesions.
Vitiligo is a skin disease that is caused by selective destruction of melanocytes and is characterized by white spots. Melanocytes and keratinocytes seem to exhibit a functional close relationship, mediated at least in part by keratinocyte-derived cytokines, which seem important for survival and activity of melanocytic cells. We wanted to investigate the hypothesis that in vitiligo the expression of epidermal cytokines may be modified compared with normal skin. In 15 patients with active, non-segmental vitiligo, biopsies were obtained from lesional, perilesional and non-lesional skin; normal skin from five healthy donors was also tested. Tissue sections were tested using immunohistochemistry for the expression of keratinocyte-derived cytokines with stimulating activity, such as granulocyte-monocyte colony stimulating factor (GM-CSF), basic fibroblastic growth factor (bFGF), and stem cell factor (SCF) or with inhibiting activity, such as interleukin 6 (IL-6) and tumour necrosis factor alpha (TNF-alpha) on melanocytes. Cytokine receptors and specific melanocytic markers were also investigated. No melanocyte was identified in lesional skin by means of specific markers or c-kit receptor, whereas in perilesional, non-lesional and healthy skin, melanocytes were found in similar number. In vitiligo skin a significantly lower expression of GM-CSF, bFGF and SCF was found, and a significantly higher expression of IL-6 and TNF-alpha was detected, compared with perilesional, non-lesional and healthy skin. In conclusion, we provided evidence that a significant change of epidermal cytokines exists in vitiligo skin compared with perilesional, non-lesional and healthy skin, suggesting that the cytokine production of epidermal microenvironment may be involved in vitiligo.
Adult↗
Trichotillomania.
UNLABELLED: Trichotillomania is a neglected psychiatric disorder with dermatologic expression that has only recently received research attention. On the basis of clinical data, trichotillomania appears to be far more common than previously believed. Like obsessive-compulsive disorder, the hair-pulling behavior is recognized as senseless and undesirable but is performed in response to several emotions and affects, such as increasing anxiety, or unconscious conflicts with resultant tension relief. The condition may be episodic but is usually chronic and difficult to treat. On the basis of possible medical and psychiatric complications, it is important that the diagnosis is exact and early. We describe the comorbidity and the phenomenology of trichotillomania, paying attention to the possible available treatments. (J Am Acad Dermatol 2002;46:807-21.) LEARNING OBJECTIVE: At the conclusion of this learning activity, participants should be familiar with clinical and histologic aspects of trichotillomania and should be able to cope with the risks of medical and psychiatric complications in these patients. Finally, participants will be able to easily interact with psychiatrists, when needed, to identify the most successful treatment.
Behavior Therapy↗