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The Thyrotropic Cell in the Atlantic Salmon, Salmo salar
Author(s) -
Fridberg Gunnar,
Lindahl Kenneth,
Ekengren Bo
Publication year - 1981
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1981.tb00615.x
Subject(s) - salmo , biology , medicine , endocrinology , antiserum , carp , fish <actinopterygii> , cell , cytology , cell type , intraperitoneal injection , antigen , immunology , biochemistry , fishery , genetics
The thyrotropin (TSH) producing cells are distributed in the rostral and proximal pars distalis. This cell type is the smallest and most infrequent cell of the adenohypophysis. Its cytology is similar to the smallest gonadotropic (GTH) cells although the two cell types can be separated by the size of the small secretory granules (diameter less than 200 nm) in the TSH cells. In presmolts and smolts the cells are more numerous than in parr and adult salmon and have cytological features indicating an increased activity. This was also the case after intraperitoneal injections of synthetic TRH. Antisera to carp GTH and salmon GTH cross‐reacted with both the GTH and the TSH cells. Anti‐human TSH cross‐reacted only with the TSH cells which confirms the assumption of antigenic similarity between human and fish TSH.