Tissue distribution of smg p25A, a ras p21-like GTP-binding protein, studied by use of a specific monoclonal antibody

Biochemical and Biophysical Research Communications
A MizoguchiY Takai

Abstract

We made a monoclonal antibody specifically recognizing smg p25A among many ras p21-like GTP-binding proteins and investigated the tissue distribution of smg p25A by use of this antibody. By immunoblot analysis, smg p25A was detected in rat brain and bovine adrenal medulla but not in bovine adrenal cortex or other rat tissues including thymus, spleen, lung, heart, liver and kidney. However, by immunocytochemical studies, smg p25A was detected not only in the synaptic areas of rat brain and the chromaffin cells of bovine adrenal medulla but also in the endocrine cells of rat pancreatic islets, the acinar cells of rat exocrine pancreas and the exocrine cells of rat submaxillary gland. These results suggest that smg p25A is involved in the regulation of secretory processes not only in synapses but also in other endocrine and exocrine secretory cells.

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