The ACTH-interrenal axis in the freshwater stickleback, Gasterosteus aculeatus form leiurus

Changes in the Cells of the Adenohypophysis Associated with the Diadromous Migration of the Threespine Stickleback, <i>Gasterosteus aculeatus</i> L

“…By both light and electron microscopy seven to eight cell types have been discernible in the adenohypophysis of the teleosts. The pituitary gland of both marine and freshwater threespine stickleback has also been investigated thoroughly by LEATHERLAND (1970a, b), BENJAMIN (1974a, b), BENJAMIN andIRELAND (1974) andFOLLENIUS andDUBOIS (1974), and the assumed prolactin secretory cell showed pronounced changes at different stages of the migratory cycle of the marine type (LEATHERLAND, 1970a). Nearly identical changes associated with seasons were reported in the freshwater type (BENJAMIN, 1974b).…”

“…The identification and seasonal and experimentally induced changes in the adenohypophysial cells of both freshwater and marine forms of the European and North American threespine stickleback were investigated thoroughly by light and electron microscopy (LEATHERLAND, 1970a, b;BENJAMIN, 1974a, b;BENJAMIN and IRELAND, 1974). Immunocytological demonstration of the MSH-producing cell was also achieved in the mature specimen of threespine stickleback (FOLLENIUS and DUBOIS, 1974).…”

Ultrastructural and histochemical study on the interrenal cells of the male stickleback (Gasterosteus aculeatus, Teleostea), in relation to the reproductive annual cycle

“…In particular, a study on rat adrenocortical cells after ACTH treatment showed hypertrophy of cells and increase in volume of nuclei, mitochondrial compartment and SER (Rebuffat et al 1989). Larger nuclei, cell hypertrophy and hyperplasy were observed in stickleback after ACTH injections (Benjamin & Ireland, 1974). Therefore phase 2, rich in endoplasmic reticulum and mitochondria, appears as a phase of active ACTH-induced hormone synthesis.…”

Social dominance and interrenal cell activity in rainbow trout, Salmo gairdneri (Pisces, Salmonidae)

“…Hartman 1965, Jenkins 1969. McLeay (1973aMcLeay ( , 1973bMcLeay ( , 1975, and Benjamin & Ireland (1974), and others previously, have demonstrated that the morphometric analysis of interrenal cell activity is a reasonable indicator of pituitary-interrenal activity in teleost fishes, including salmonid species. There is good evidence in tetrapods that steroid secretion is affected by an animal's standing in a social hierarchy, but this has not been validated in fish.…”