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The effect of diacylglycerols on fibronectin release and its reversal by retinoic acid in cell culture
Department of Nutritional Sciences, University of California Berkeley, CA 94720, USA
1Institute for Medical Chemistry, University of Vienna A-1090 Austria
2Immuno AG Vienna, A-1220 Austria
3To whom correspondence should be addressed
Previous work from our laboratory showed that tumor promoters such as phorbol ester (TPA) stimulated the release of fibronectin (FN) from the surface of several cell types in culture, and that this stimulation was counteracted by retinoic acid. Diacylglycerols (DAGs) are the endogenous ligands of the TPA receptor and can activate and translocate protein kinase C (PKC) in a manner similar to TPA. To show that the release of FN is related to activation of PKC, we tested the action of DAGs on FN release from human lung fibroblasts and its counteraction by retinoic acid. We found that DAGs stimulated the release of FN in a concentration- and time-dependent manner. The stimulation of the release of FN correlated with the translocation-activation of PKC by DAG. Retinoic acid reversed the action of DAG with respect to stimulation of EN release and inhibited this release even in the absence of DAG. These results suggest that the release of EN is in some way related to translocation-activation of PKC.
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