Peptide hormone production by adenocarcinomas of the lung; its morphologic basis and histogenetic considerations.
The cell source of peptide hormone production and the morphological differentiation were investigated in 18 adenocarcinomas of the lung by immunohistochemistry and/or by electron microscopy. These tumors were found by radioimmunoassay of tumor extracts to contain either one or more of 7 peptide hormones, i.e. adrenocorticotropin (ACTH), beta- and gamma-melanocyte stimulating hormones (MSH), somatostatin (SS), vasoactive intestinal polypeptide (VIP), gastrin releasing peptide (GRP) and calcitonin (CT). In a combined adeno- and small cell carcinoma, a considerable number of small tumor cells were positively stained for ACTH, beta- and gamma-MSHs and GRP. In a poorly differentiated adenocarcinoma with mucin and CT production, these products were localized in some single cells. Electron microscopy revealed secretory granules indistinguishable from exocrine or endocrine types. In another mucin-positive adenocarcinoma with high SS and CT contents, some tumor cells were stained for SS and/or CT. Two distinct exocrine and endocrine type secretory granules were found in the same cells. In tumors with 100 ng or less of the peptides/g tissue, most tumor cells were not stained for the peptides but a small number showed morphological endocrine differentiation. In conclusion, a considerable proportion of the adenocarcinomas of the lung may show heterogeneous differentiation in both endocrine and exocrine directions.
D000230:Adenocarcinoma / Q000378:metabolism* / Q000648:ultrastructure; D000324:Adrenocorticotropic Hormone / Q000096:biosynthesis; D002116:Calcitonin / Q000096:biosynthesis; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D019886:Gastrin-Releasing Peptide; D006651:Histocytochemistry; D006728:Hormones / Q000032:analysis / Q000096:biosynthesis*; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism* / Q000648:ultrastructure; D009074:Melanocyte-Stimulating Hormones / Q000096:biosynthesis; D008854:Microscopy, Electron; D010452:Peptide Biosynthesis; D013004:Somatostatin / Q000096:biosynthesis; D014660:Vasoactive Intestinal Peptide / Q000096:biosynthesis
D006728:Hormones; D014660:Vasoactive Intestinal Peptide; D013004:Somatostatin; D019886:Gastrin-Releasing Peptide; D000324:Adrenocorticotropic Hormone; D009074:Melanocyte-Stimulating Hormones; D002116:Calcitonin