Promotion of retinal neurite outgrowth by substratum-bound fibronectin.

Abstract We have examined conditions under which aggregates of embryonic chick neural retina will extend neurities in vitro. Trypsin-dispersed cells from 7-day embryonic chick neural retina were aggregated in rotation culture for 8 hr and maintained in serum-free medium on a variety of standard culture substrate. Aggregates extend few neurites on untreated plastic, glass, or collagen substrata. However, pretreatment of these substrata with human plasma fibronectin enhances their capacity to support retinal neurite outgrowth. Aggregates cultured on fibronectin-treated substrata extend long, radially oriented neurites within 36 hr in vitro. The morphology of these neurites is distinct from that seen when aggregates are cultured on polylysine-treated substrata. In the latter case, neurites are highly branched and grow concentrically around the aggregate perimeter. Addition of fibronectin to polylysine-treated substrata stimulates radial neurite outgrowth. Promotion of neurite outgrowth is dependent on the amount of fibronectin bound to the culture substratum and on the pH at which binding occurs. The requirements for fibronectin-mediated neurite outgrowth are more stringent than those previously reported for fibroblast attachment and spreading.

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