title: The role of lesional T cells in recalcitrant psoriasis during infliximab therapy.
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.
authors.affiliation: Department of Dermatology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands. j.bovenschen@derma.umcn.nl
authors.forename: H J
authors.initials: HJ
authors.lastname: Bovenschen
authors.forename: P C M
authors.initials: PC
authors.lastname: Van De Kerkhof
authors.forename: W J
authors.initials: WJ
authors.lastname: Gerritsen
authors.forename: M M B
authors.initials: MM
authors.lastname: Seyger
mesh_terms: D000911:Antibodies, Monoclonal / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D000069285:Infliximab; D008875:Middle Aged; D011565:Psoriasis / Q000188:drug therapy* / Q000276:immunology* / Q000473:pathology; D013601:T-Lymphocytes / Q000502:physiology*; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors*
chemical_list: D000911:Antibodies, Monoclonal; D014409:Tumor Necrosis Factor-alpha; D000069285:Infliximab