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- W1935003084 abstract "CD11a-blocking efalizumab has recently been approved as a systemic treatment of moderate to severe chronic plaque psoriasis. When treating 6 psoriasis patients with efalizumab over 12 weeks in the present study, we observed an overall good tolerability and 5 treatment responders characterized by a decrease of PASI from 21.3 +/- 5.4 to 3.9 +/- 0.6. The accompanying significant increase of peripheral blood lymphocytes from 1.9 +/- 0.7 to 4.3 +/- 1.0 x 10(9)/L (p < 0.05) was analyzed by multi epitope ligand cartography (MELC) robot microscopy. Thereby a high-dimension simultaneous multiplex immunophenotyping was pursued using 39 fluorophore-labeled antibodies including labeled efalizumab and 3 other affinity reagents such as lectins. Due to efalizumab treatment there was a substantial decrease of the cellular expression of CD11a (detected by mab clone 25.3.1) and efalizumab binding sites (EfaBSs). This was paralleled by an increase of the number of EfaBS- and EfaBS+ lymphocytes by a factor of 2.4x and 2.2x, respectively. The latter effect was mainly derived from a subpopulation showing a low degree of EfaBS expression. Efalizumab treatment led furthermore to an increase of the numbers of CD3+, CD4+, CD8+, CD44+, CD45+, CD45R0+, CD45 RA+, CD52+, CD58+, CD247+, HLA-DR+ and Sambucus nigra lectin-reactive lymphocytes (by factors from 2.0 to 3.3x). In terms of a combinatorial molecular phenotype we identified a CD3+/CD4+/CD44+/CD52+ lymphocyte subpopulation which accumulated most predominantly from 0.824 +/- 0.270 x 10(9)/L up to 1.616 +/- 0.152 x 10(9)/L under efalizumab treatment (p < 0.01). Thus, the current study extends the knowledge of efalizumab-dependent perturbations of recirculating blood lymphocyte subpopulations in psoriasis patients." @default.
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- W1935003084 date "2006-11-01" @default.
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- W1935003084 title "Profiling lymphocyte subpopulations in peripheral blood under efalizumab treatment of psoriasis by multi epitope ligand cartography (MELC) robot microscopy" @default.
- W1935003084 doi "https://doi.org/10.1684/ejd.2006.0005" @default.
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