Thrombospondin-induced attachment and spreading of human squamous carcinoma cells

Experimental Cell Research
J VaraniT E Carey

Abstract

Thrombospondin (TSP) induced the attachment and spreading of human squamous carcinoma cells on plastic culture dishes and dishes coated with type I or type IV collagen. Increased adhesion was detected as early as 15 min after treatment. Dose-response studies indicated that 1-5 micrograms of TSP per 35 mm (diameter) culture dish was sufficient to induce a response and that a half-maximal response occurred at 10 micrograms of TSP/dish. The squamous carcinoma cells synthesized TSP as indicated by biosynthetic labeling experiments. TSP was secreted (or shed) into the culture medium by these cells and also became bound to the cell surface. TSP also promoted adhesion of human keratinocytes, fibroblasts and fibrosarcoma cells but did not induce attachment or spreading of human melanoma or glioma cells, although these cells did respond to laminin.

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