Matrix metalloproteinase inhibitors disrupt spicule formation by primary mesenchyme cells in the sea urchin embryo

Developmental Biology
Eric P Ingersoll, Fred H Wilt

Abstract

The primary mesenchyme cells of the sea urchin embryo construct an elaborate calcareous endoskeletal spicule beginning at gastrulation. This process begins by ingression of prospective primary mesenchyme cells into the blastocoel, after which they migrate and then fuse to form a syncytium. Skeleton deposition occurs in spaces enclosed by the cytoplasmic cables between the cell bodies. Experiments are described which probe the role of proteases in these early events of spicule formation and their role in the continued elaboration of the spicule during later stages of embryogenesis. We find that several inhibitors of metalloproteinases inhibit the continuation of spiculogenesis, an effect first reported by Roe et al. (Exp. Cell Res. 181, 542-550, 1989). A detailed study of one of these inhibitors, BB-94, shows that fusion of primary mesenchyme cells still occurs in the presence of the inhibitor and the formation of the first calcite granule is not impeded. Continued elaboration of the spicule, however, is completely stopped; addition of the inhibitor during the active elongation of the spicule stops further elongation immediately. Removal of the inhibitor allows resumption of spicule growth. The inhibition is accompanied by almos...Continue Reading

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