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American Journal of Pathology, Vol 130, 296-304, Copyright © 1988 by American Society for Investigative Pathology

REGULAR ARTICLES

Distribution of chromogranin A and secretogranin I (chromogranin B) in neuroendocrine cells and tumors

RV Lloyd, M Cano, P Rosa, A Hille and WB Huttner
Department of Pathology, University of Michigan, Ann Arbor 48109.

The distribution of chromogranin A and secretogranin I (chromogranin B) in normal and neoplastic human endocrine tissues was analyzed with two human monoclonal antibodies against chromogranin A, anti-bovine antiserum against chromogranin A, and an anti-rat antiserum against secretogranin I. Western blotting analyses showed both chromogranin A and secretogranin I in normal adrenals, pheochromocytomas, a pituitary adenoma, and in normal pituitary glands, but not in a bladder carcinoma. Rat adrenal medullary and anterior pituitary tissues reacted with the polyclonal chromogranin A and secretogranin I antisera, but not with the two monoclonal chromogranin A antibodies. All antibodies reacted with most of the neuroendocrine cells and tumors examined. Pituitary prolactinomas contained immunoreactive secretogranin I, but not chromogranin A. Analysis of the distribution of chromogranin A and secretogranin I in pancreatic islet cells showed that chromogranin A was found predominantly in the glucagon-producing A cells, whereas secretogranin I was present in less than 5% of islet cells. These results indicate that chromogranin A and secretogranin I are both useful in the characterization of some neuroendocrine cells and neoplasms.

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