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Production of immunoreactive atrial natriuretic polypeptide in neuroendocrine tumors
Author(s) -
Yoshinaga Keigo,
Yamaguchi Ken,
Abe Kaoru,
Inoue Takeo,
Mishima Yoshio
Publication year - 1994
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/1097-0142(19940215)73:4<1292::aid-cncr2820730426>3.0.co;2-h
Subject(s) - atrial natriuretic peptide , pheochromocytoma , medicine , thyroid , endocrinology , pathology , endocrine system , small cell carcinoma , medullary carcinoma , neuroendocrine tumors , carcinoma , paraganglioma , small cell lung carcinoma , hormone , thyroid carcinoma
Background . Peptide hormone synthesis in neuroendocrine tumors is a well‐recognized phenomenon. However, production in neuroendocrine tumors of atrial natriuretic polypeptide (ANP), a newly discovered peptide hormone from the heart, has not been studied extensively. Methods . The presence of immunoreactive human ANP (IR‐hANP) in neuroendocrine tumors was determined using a specific human ANP radioimmunoassay. Neuroendocrine tumors examined included 9 small cell carcinomas of the uterus, 28 small cell carcinomas of the lung, 20 carcinoid tumors, 54 pancreatic endocrine tumors, 17 neuroblastic tumors, 14 pheochromocytomas, and 14 medullary carcinomas of the thyroid. Twenty atrial tissues also were examined as the control. Molecular size of IR‐hANP in the extracts of atrial and tumor tissues was determined by gel chromatography. Results . IR‐hANP was detected in the extracts of small cell carcinoma of the uterus, small cell carcinoma of the lung, and carcinoid tumor, with concentrations ranging from 3.1 to 210 ng/g wet weight tissue. No IR‐hANP was detected in the extracts of pancreatic endocrine tumor, neuroblastic tumor, pheochromocytoma, and medullary carcinoma of the thyroid. The frequency of production of IR‐hANP in neuroendocrine tumors was highest in small cell carcinoma of the uterus (44%), followed by small cell carcinoma of the lung (18%) and carcinoid tumor (15%). IR‐hANP present in the extracts of small cell carcinomas of the uterus had molecular size heterogeneity, with three fragments in addition to α‐, β‐and γ‐human ANP. Conclusions . These results indicate that IR‐hANP is produced by neuroendocrine tumors and that the molecular size of IR‐hANP in tumor tissues is different from that in atrial tissues. Cancer 1994; 73:1292–6.