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. 1990 Nov 1;111(5):1939–1948. doi: 10.1083/jcb.111.5.1939

Regulation of organelle transport in melanophores by calcineurin

PMCID: PMC2116335  PMID: 2172259

Abstract

Previous studies have shown that pigment granule dispersion and aggregation in melanophores of the African cichlid, Tilapia mossambica, are regulated by protein phosphorylation and dephosphorylation, respectively (Rozdzial, M. M., and L. T. Haimo. 1986. Cell. 47:1061- 1070). The present studies suggest that calcineurin, a Ca2+/calmodulin- stimulated phosphatase, is the endogenous phosphatase that mediates pigment aggregation in melanophores. Aggregation, but not dispersion, is inhibited by okadaic acid at concentrations consistent with an inhibition of calcineurin activity. Inhibition of aggregation in melanophores that have been BAPTA loaded or treated with calmodulin antagonists implicate Ca2+ and calmodulin, respectively, in this process. Moreover, addition of calcineurin rescues aggregation in lysed melanophores which are otherwise incapable of aggregating pigment. Immunoblotting with an anticalcineurin IgG reveals that calcineurin is a component of the dermis, which contains the melanophores, and indirect immunofluorescence localizes calcineurin specifically to the melanophores. Finally, this antibody, which inhibits calcineurin's phosphatase activity (Tash, J. S., M. Krinks, J. Patel, R. L. Means, C. B. Klee, and A. R. Means. 1988. J. Cell Biol. 106:1625-1633), inhibits aggregation but has no effect on pigment granule dispersion. Together these studies indicate that retrograde transport of pigment granules to the melanophore cell center depends upon the participation of calcineurin.

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Selected References

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