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  • Title: The role of lesional T cells in recalcitrant psoriasis during infliximab therapy.
    Author: Bovenschen HJ, Van De Kerkhof PC, Gerritsen WJ, Seyger MM.
    Journal: Eur J Dermatol; 2005; 15(6):454-8. PubMed ID: 16280298.
    Abstract:
    With infliximab therapy (anti-TNF-alpha) for plaque psoriasis, over 80% of patients reach > or = 75% PASI improvement in 10 weeks of treatment. We describe a patient with severe recalcitrant psoriasis who was treated with infliximab 5 mg/kg for 22 weeks. Rather than the expected improvement, this patient experienced an initial exacerbation, followed by the lack of efficacy over the entire 22-week period of treatment. Before, during and after treatment we performed immunohistochemical analyses on lesional biopsies, with respect to T cells, NK-T cells, epidermal growth and differentiation. We found a discrepancy between the clinical aggravation and marked reductions of lesional T cell subsets. The most prominent decrease was for CD4+ T cells (72-74%), which suggests that a reduction of T cells in the psoriatic plaque might not be a guarantee for positive clinical outcomes. Remarkably, the number of epidermal CD94+ NK-T cells correlated fairly well with the lack of clinical efficacy, supposing a pathogenic role for these cells in psoriasis. Further studies are needed to clarify the ambiguous role of conventional pathogenic T cells in plaque psoriasis.
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