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Two novel monoclonal antibodies, called B11 and B13, directed exclusively against human chromogranin B (CgB) and another antibody, A11, specific for human chromogranin A (CgA), were obtained by immunization of mice with chromaffin granules, the fusion of their splenocytes, the screening of hybridomas supernatants by ELISA and immunohistochemistry, and characterization of the antibodies by two-dimensional immunoblotting. The antibodies were used in immunohistochemical tests to investigate the distribution of CgA and CgB in hormonally-identified cells of the human endocrine system. The A11 antibody confirmed the occurrence of CgA in gut EC, ECL, gastrin, secretin and neurotensin cells, pancreatic A and PP cells, parathyroid chief cells, pituitary TSH and gonadotrope cells and adrenal medullary cells. Only a fraction of CgA-immunoreactive cells in the human gut and pancreas showed C-terminus arginine-glycinamide immunoreactivity, suggesting pancreastatin storage. Both CgB antibodies showed immunoreactivity in gastrin cells, intestinal (but not gastric) EC cells, pancreatic A and PP cells, pituitary TSH and gonadotrope cells and adrenal medullary cells. In addition, the B11 antibody stained thyroid C cells and the B13 antibody stained the Golgi area of pituitary GH cells. It is concluded that most CgB is stored in the same cells showing CgA, although some CgA-rich cells, like gastric EC and ECL cells. lacked B11 and B13 immunoreactivities and some CgA-poor cells, like human thyroid C cells, showed intense B11 immunostaining.

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Immunoreactivity of hormonally-characterized human endocrine cells against three novel anti-human chromogranin B(B11 and B13) and chromogranin A (A11) monoclonal antibodies.