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Insulin release in response to dextran-linked p-chloromercuribenzoic acid was studied in microdissected pancreatic islets of non-inbred ob/ob-mice. No contamination of the dextran-linked mercurial with free chloromercuribenzoic acid was detected before or after the incubation with islets. In comparison with free mercurial, of the same thiol-blocking activity, the dextran-linked compound had a weak insulin-releasing action with a different dose vs. response relationship. The dextran-linked mercurial had no demonstrable effect on the islet content of cyclic AMP. The results support the hypothesis that free organic mercurials mainly stimulate insulin release by blocking thiol ground that are embedded within the beta-cell plasma membranes beneath their surfaces.
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