Alpha 2u globulin, a protein of unknown function so far believed to be synthesized exclusively in the male liver under multihormonal control, is now shown to be localized by immunocytochemistry in the granular convoluted tubules of the adult male submaxillary gland. In addition, using Northern blot analysis, we have shown specific alpha 2u globulin mRNA sequences in the RNA extracted from the submaxillary gland. Thus, it is evident that the protein is being synthesized therein. Alpha 2u globulin was also detected in the submaxillary gland duct cells of adult female and immature animals of both sexes, all of which are known not to synthesize alpha 2u globulin in their livers. The present data have established that alpha 2u globulin is synthesized in the rat submaxillary gland and indicate that the control of alpha 2u globulin gene expression in the rat liver and in the submaxillary gland is different.
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