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Research Article| Volume 38, ISSUE 1, P47-55, April 2005

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Nadifloxacin, an antiacne quinolone antimicrobial, inhibits the production of proinflammatory cytokines by human peripheral blood mononuclear cells and normal human keratinocytes

      Summary

      Background:

      Acne vulgaris is a chronic inflammatory disease involving colonization of Propionibacterium acnes (P. acnes), activation of neutrophils and lymphocytes. Circumstantial evidence suggests that antigen-independent and -dependent immune responses against P. acnes are involved in the pathogenesis of inflammatory acne. Epidermal keratinocytes are also suggested to be involved in initiation and progression of cutaneous inflammation. Nadifloxacin, a fluorinated quinolone, has potent antimicrobial activities against Gram-negative and -positive microbes and is used to treat multiple inflamed acne lesions. However, its effect on immune conferring cells such as mononuclear cells and keratinocytes has not been examined.

      Objective:

      To evaluate the possible involvement of potential anti-inflammatory activity of nadifloxacin in its therapeutic effect on inflammatory acne, we examined the effects of nadifloxacin, in comparison with other antibiotics used to treat acne vulgaris, on cytokine production by human peripheral blood mononuclear cells (PBMC) and keratinocytes.

      Methods:

      Cytokine production by PBMC was determined after treatment with heat-killed P. acnes in the presence or absence of antimicrobials using a real-time PCR and ELISA. Cultured human epidermal keratinocytes were stimulated by IFN-γ plus IL-1β and the effects of antimicrobials were examined by using ELISA.

      Results:

      Nadifloxacin as well as macrolide antibiotics and clindamycin inhibited IL-12 and IFN-γ production by PBMC stimulated by heat-killed P. acnes. The drug also inhibited the IL-1α, Il-6, IL-8 and GM-CMS production by keratinocytes treated with IFN-γ plus IL-1β.

      Conclusions:

      Inhibitory effects of nadifloxacin to activate T cells and keratinocytes may be involved at least in part in the mechanism of its therapeutic effect against inflammatory acne.

      Abbreviations:

      PBMC (peripheral blood mononuclear cell), NDFX (nadifloxacin), LVFX (levofloxacin)

      Keywords

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