Endothelin in ectopic ACTH-secreting bronchial carcinoid tumors.
The presence of immunoreactive endothelin (ir-ET) in the tumor tissues of two cases of ectopic ACTH-secreting bronchial carcinoid tumors was studied by radioimmunoassay. The cross-reaction with big ET-1, ET-2, and ET-3 was 5%, 6%, and 6%, respectively. Tumor tissue ir-ET concentrations in two ectopic ACTH-secreting bronchial carcinoid tumors were 920 and 3,370 fmol/g wet weight, which were much higher than those in pheochromocytomas (146 +/- 70 fmol/g wet weight; n = 12, mean +/- SD), adrenocortical tumors (115 +/- 105 fmol/g wet weight, n = 14), and normal parts of adrenal glands (82 +/- 31 fmol/g wet weight, n = 12). High-performance liquid chromatography of the tumor tissue extract showed that the ir-ET was mainly eluted in the position of ET-1. Plasma levels of ir-ET in these two cases were not elevated (1.2 and 1.7 pmol/L). The findings of the present study suggest that ET-1 has local pathophysiologic roles in the tumor tissues of ectopic ACTH-secreting bronchial carcinoid tumors.
Takahashi
K
K
Second Department of Internal Medicine, Tohoku University School of Medicine, Miyagi, Japan.
Satoh
F
F
Murakami
O
O
Totsune
K
K
Sone
M
M
Itoi
K
K
Ohneda
M
M
Mouri
T
T
D000306:Adrenal Cortex Neoplasms / Q000378:metabolism; D000310:Adrenal Gland Neoplasms / Q000378:metabolism; D000324:Adrenocorticotropic Hormone / Q000378:metabolism*; D000918:Antibody Specificity; D001984:Bronchial Neoplasms / Q000378:metabolism*; D002276:Carcinoid Tumor / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D016232:Endothelins / Q000276:immunology / Q000378:metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D010673:Pheochromocytoma / Q000378:metabolism; D011863:Radioimmunoassay
D016232:Endothelins; D000324:Adrenocorticotropic Hormone