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MONONUCLEAR CELL VERSUS MONOCYTE CHEMOTAXIS IN PSORIASIS

Chemotaxis under agarose of psoriatic mixed mononuclear cells (MNs) and pure monocytes against Zymosan treated sera (ZAS), fresh psoriatic serum, and fresh normal serum was studied and compared with that of normal cells. Purification of monocytes was achieved on microexudate coated BHK flasks. Psoriatic MNs were found to be more chemotactic against psoriatic serum (P.S.) than normal MNs against normal serum (N.S.). Psoriatic cells were chemotactically more active than normal ones against psoriatic and normal serum but not against ZAS. Mixed mononuclear cells showed definitely increased chemotaxis over that of pure monocytes. When culture supernatants with lymphocyte derived factor (LDCF) activity were mixed with normal pure monocytes, the chemotactic activity of the monocytes recovered. It is, therefore, proposed that the LDCF from in vivo stimulated psoriatic lymphocytes by antigenic or mitogenic substances of psoriatic plaque might be an essential factor for the increased chemotaxis of mixed psoriatic MNs compared to pure monocytes. This hypothesis also explains the increased chemoattracting capacity of psoriatic serum for psoriatic and normal MNs as due to the in vivo release of lymphokine.