It appears that silicone hydrogel lenses may be slightly less irritating to the ocular surface than lenses not containing silicone. This could be a promising indicator for successful 30-day continuous wear.

Trifluoperazine (TFP) blocks spreading and migration of cultured mammalian cells. These are calcium-dependent and microfilament-mediated processes. Calmodulin, a regulator of many calcium-dependent processes in cells, is selectively inhibited by TFP. Cell spreading on a plastic- or collagen-coated substratum was reversibly inhibited by 10 micro M TFP. The drug blocks cell spreading even in the presence of 1 mM cAMP. TFP is as effective as cytochalasin B (CB), in inhibitor of microfilament function, in blocking cell spreading. All cell lines tested, whether "normal" or virally transformed, failed to spread to TFP. The drug, at a concentration sufficient to inhibit spreading, does not interfere with the initial attachment of a cell to a plastic surface. Cells plated in the presence of 10 micro M TFP attach at a rate and to an extent equal to untreated controls. TFP added to already spread cells results in a reversible cell rounding. Detection of fibronectin by indirect immunofluorescence suggests TFP-induced cell rounding is not due to shedding of fibronectin from the cell surface. TFP reversibly blocks cell migration into a would edge almost as effectively as CB. We suggest that TFP interferes with these microfilament-mediated functions by direct action on the microfilaments or indirect action by inactivating calmodulin.

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