Prostaglandin E_1 (PGE_1) has been proven to be effective in the treatment of chronic skin ulcers and wounds.To elucidate the possible mechanism involved,normal human keratinocytes and der- mal fibroblasts were cultured with PGE_1.Cell proliferation was measured by MTT assay and cytokine production by enzyme-linked immunosobent assay (ELISA).The results revealed that keratinocytes produced IL-1?,IL-8,TGF? and PDGF,while dermal fihroblasts produced IL-6 and IL-8,suggesting dif- ferent kinds of cytokine production between keratinocytes and dermal fibroblasts.PGE_1 promoted IL-6 and IL-8 production in dermal fibroblasts but not in keratinocytes.Moreover,PGE_1 promoted cell prolif- eration in dermal fibroblasts but not in keratinocytes,suggesting that dermal fibroblasts are more sensi- tive than keratinocytes to PGE_1 and that the therapeutic effects of topical PGE_1 on skin ulcer or wound may mainly be mediated by its effects on dermal fibroblasts.

Although the precise pathoetiology of Behcet's disease (BD) remains obscure, patients with BD have a high incidence of chronic infectious foci, indicating an enhanced susceptibility to chronic tonsillitis, and dental caries. Sometimes, clinical symptoms appear after treatment of these foci in BD patients. It is believed that BD might be related to an allergic reaction to a bacterial infection in view of the many clinical symptoms, especially the presence of aphthous and genital ulcerations. An attempt to obtain cutaneous responses to bacterial antigens has been carried out using various vaccines developed from bacteria isolated from the ulcerative lesions and oral cavities of BD patients. BD patients often show intense hypersensitivity to various strains of streptococci, not only by their cutaneous reactions but also by in vitro testing. In this report, we describe our previous studies on the correlation between streptococcal antigens and the pathogenesis of BD and also discuss the recent reports of other authors. The intense hypersensitivity to streptococcal antigens acquired after streptococcal infection is thought to play an important role in the appearance of symptoms in BD patients since the production of pro-inflammatory cytokines by peripheral blood mononuclear cells (PBMC) was enhanced when stimulated with streptococcal antigen in a culture system. Minocycline, an antibiotic to which certain strains of streptococci are sensitive, reduced the frequency of clinical symptoms in BD patients as well as the production of pro-inflammatory cytokines by BD-PBMC stimulated with streptococcal antigen.
Adult ; Antibiotics, Tetracycline/therapeutic use* ; Antigens, Bacterial/immunology ; Behcet's Syndrome/immunology ; Behcet's Syndrome/etiology* ; Behcet's Syndrome/drug therapy ; Cytokines/biosynthesis ; Female ; Human ; Male ; Minocycline/therapeutic use* ; Skin Tests ; Streptococcal Infections/drug therapy ; Streptococcal Infections/complications*

OBJECTIVESThe aim of this study was to determine the prevalence of Echinococcus multilocularis environmental contamination in an urban fringe-the Nopporo forest park of Sapporo city, Hokkaido, Japan. A secondary aim was to determine possible transmission risks areas by associating percentage occurrence of E. multilocularis-positive faeces with the different land-use classes.

METHODSWild fox faeces collected from the environment were examined by intravital methods, such as the taeniid egg sucrose floatation technique, E. multilocularis coproantigen enzyme-linked immunosorbent analysis and DNA test of taeniid eggs by PCR. Geospatial maps produced by the Global Positioning System and Landsat data were analysed using geographic information system software to determine the association between percentage occurrences of E. multilocularis-positive fox faeces and land-use classes.

RESULTSOur findings showed high prevalence rates in both E. multilocularis egg and coproantigen-positive faeces (16 and 49%, respectively) in the investigated urban fringe forest park. Data revealed that percentage occurrence of E. multilocularis-positive fox faeces was associated with land-use classes, such as forest and open field (P < 0.05).

CONCLUSIONSWe conclude that Nopporo forest park in the urban fringe of Sapporo city, Hokkaido is a reservoir with a high prevalence of zoonotic infective agents for alveolar echinococcosis. Our findings suggest that interface habitats between forests or woodlands and open fields are indispensable for continued maintenance of the life-cycle of E. multilocularis and, as such, constitute high risk areas for echinococcosis transmission.