Rosacea

Dermatology. 2009; 219(2): 179-81Oberholzer PA, Nobbe S, Kolm I, Kerl K, Kamarachev J, Trüeb RM

Arch Immunol Ther Exp (Warsz). 2009 Aug 18; Meyer-Hoffert UThe skin protects us from water loss and mechanical damage. The surface-exposed epidermis, a self-renewing stratified squamous epithelium composed of several layers of keratinocytes, is most important in the barrier defense against these challenges. Endogenous and exogenous proteases such as kallikreins, matriptase, caspases, cathepsins, and proteases derived from microorganisms are important in the desquamation process of the stratum corneum and are able to activate and inactivate defense molecules in human epidermis. Protease inhibitors such as like LEKTI, elafin, SLPI, SERPINs, and cystatins regulate their proteolytic activity and contribute to the integrity and protective barrier function of the skin. Changes in the proteolytic balance of the skin can result in inflammation, which leads to the typical clinical signs of redness, scaling, and itching. This review summarizes the current knowledge of how proteases, their inhib...

It has been reported that Demodex mites play a role in the pathogenesis of rosacea, acne vulgaris, perioral dermatitis, seborrhoeic dermatitis, micropapular-pruritic dermatitis, and blepharitis . Methods used for diagnostic purposes included cyanoacrylic adhesives, comedone extractor, cellophane tape preparations, skin scraping, punch biopsy and standardized surface skin biopsy . This study is a retrospective work. The aim of the present retrospective study was the investigation of the incidence of Demodex mites using histopathological examination of skin biopsy specimens of keratinized cysts, fungal spores, tricholemmal cysts, nevi, dermatitis, fibrosis, carcinoma and inflammation of the scalp . Fifty-nine biopsy specimens were examined histologically after staining with hematoxylen-eosin. Demodex mites (i.e., tricholemmal cyst, dermatitis, sebaceous cyst, carcinoma, keratose cysts, nevi, fungal spores ) were found in 9 (15.3%) of them. It was concluded that since this parasite is fo...

Arch Dermatol Res. 2009 Aug 4; Borgo SN, Sattler EC, Hogardt M, Adler K, Plewig GIn many skin diseases such as Demodex folliculitis, rosacea- or steroid-induced rosacea Demodex mites are present in abundance and are at least partially held responsible for causing these disorders. Although it is known that these diseases respond well to tetracyclines, it is unclear if this is due to the antiinflammatory effects of the antibiotics or to an antibacterial effect on so far unknown bacteria within the Demodex mites. As in filariasis, where the response to doxycycline can be explained by the presence of Wolbachia within the filarial nematodes, this study was performed to see whether Wolbachia also use Demodex mites as their hosts. Human and canine Demodex mite samples were taken by skin scrapings and tested by PCR for the presence of Wolbachia DNA. Wolbachia pipientis DNA was used as positive control. In none of the DNA extracts, Wolbachia were detected showing no evidence for the presence o...

J Dtsch Dermatol Ges. 2009 Jul 24; Werfel TPimecrolimus has been approved for more than five years for the treatment of atopic dermatitis in Germany. An important difference in the safety profile of this drug compared with topical corticosteroids is the lack of potential side effects which are often observed upon prolonged use of topical corticosteroids (skin atrophy, steroid-induced rosacea or perioral dermatitis). Even after prolonged use in sensitive skin areas, no tolerance to this drug is induced, in contrast to that seen with topical corticosteroids. The most common side effect of pimecrolimus is burning. Placebo-controlled studies suggest that pimecrolimus is associated with a slightly increased incidence of herpes simplex infections. Compared with topical corticosteroids, pimecrolimus does not increase the overall incidence of skin infections (including recurrent herpes simplex infections). So far, clinical studies with pimecrolimus have not shown any evidence of an increased ...