caa a22 4500 445296305 CHVBK 20180317142543.0 cr unu---uuuuu 170323e20101001xx s 000 0 eng 10.1134/S0032945210080126 doi (NATIONALLICENCE)springer-10.1134/S0032945210080126 Morphofunctional changes of the interrenal gland and of ultrastructure of chloride cells in intact and hypophysectomized juveniles of starred sturgeon Acipenser stellatus (Acipenseridae) in the course of adaptation to sea water [Elektronische Daten] [L. Krayushkina, O. Semenova] The impact of hypophysectomy on the state of the interrenal gland and ultrastructure of chloride cells of gills is investigated in 18-month old juveniles of starred sturgeon Acipenser stellatus in the process of its adaptation to artificial sea water (14.6‰). Hypophysectomized juveniles, similarly to intact juveniles, are able to support a relative stability of osmolarity of blood serum in the course of adaptation to sea water by transition from hyperosmotic to hypoosmotic type of osmoregulation. Changes in the investigated parameters of cells of the interrenal gland (volume of nuclei, areas of cells and of lipophilic vacuoles) occurring in the hypophysectomized and in intact specimens in the process of adaptation to sea water are generally similar, but have different dynamics. In contrast to many teleostean species, in acipenserids the hypophyectomy does not cause atrophy of the interrenal gland. The latter is incorporated in the process of regulation in the course of adaptation of fish to sea water. Hypophyecotmy results in partial destruction of organoids in some chloride cells of gills. However, when the fish are transferred to sea water, the structural changes occur in chloride cells characteristic of their transition to the excretory state. This may happen only at activation of the transport enzyme Na+/K+-ATPase of these cells by cortisol produced by the interrenal gland. In the absence of hypophysis, the functional connection of organs of the axis hypothalamus (ACTH-immunopositive cells of tuberal nucleus) → the interrenal gland → chloride cells is realized in the fish. Pleiades Publishing, Ltd., 2010 acipenserids nationallicence hypophysectomy nationallicence tuberal nucleus nationallicence interrenal gland nationallicence cortisol nationallicence chloride cells nationallicence osmoregulation nationallicence Krayushkina L. Department of Ichthyology and Hydrobiology, St. Petersburg State University, 16 Liniya 29, 199178, St. Petersburg, Russia aut Semenova O. Pavlov Institute of Physiology, Russian Academy of Sciences, nab. Makarova 26, 199034, St. Petersburg, Russia aut Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/8(2010-10-01), 671-681 0032-9452 50:8<671 2010 50 11489 https://doi.org/10.1134/S0032945210080126 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0032945210080126 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Krayushkina L. Department of Ichthyology and Hydrobiology, St. Petersburg State University, 16 Liniya 29, 199178, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Semenova O. Pavlov Institute of Physiology, Russian Academy of Sciences, nab. Makarova 26, 199034, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/8(2010-10-01), 671-681 0032-9452 50:8<671 2010 50 11489 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer