EFFECTS OF ENVIRONMENTAL SALINITY ON PITUITARY GROWTH-HORMONE CONTENT AND CELL-ACTIVITY IN THE EURYHALINE TILAPIA, OREOCHROMIS-MOSSAMBICUS

被引:52
作者
BORSKI, RJ
YOSHIKAWA, JSM
MADSEN, SS
NISHIOKA, RS
ZABETIAN, C
BERN, HA
GRAU, EG
机构
[1] UNIV HAWAII,HAWAII INST MARINE BIOL,HONOLULU,HI 96822
[2] UNIV CALIF BERKELEY,DEPT INTEGRAT BIOL,BERKELEY,CA 94720
[3] UNIV CALIF BERKELEY,CANC RES LAB,BERKELEY,CA 94720
[4] ODENSE UNIV,INST BIOL,DK-5230 ODENSE M,DENMARK
[5] UNIV MIAMI,SCH MED,DEPT NEUROL,MIAMI,FL 33101
关键词
D O I
10.1006/gcen.1994.1148
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
Studies were undertaken to determine whether several indicators of growth hormone (GH) cell activity, namely GH content, fine structure, and volume of the GH region, differ in the pituitaries of freshwater (FW) and seawater (SW) tilapia, Oreochromis mossambicus. Tilapia raised from the stage of yolk-sac absorption for 7 months in SW contain significantly more GH in their pituitaries than in those of fish reared in FW. Pituitary growth hormone content in tilapia raised in FW for 7 months and transferred to SW for 49 days is greater than that in sibling tilapia retained in FW. Conversely, GH content is significantly lower in the pituitaries of SW-reared tilapia transferred to FW for 49 days than that in the pituitaries from fish retained in SW. Likewise, the volume of the GH region and activity of the GH cells are enhanced in pituitaries from SW-reared tilapia over that seen in pituitaries from FW fish. Taken together, all data indicate heightened GH cell activity in SW-raised tilapia and suggest that GH may play a causal role in the greater growth rates observed in SW tilapia compared to FW fish and/or that GH may be involved in SW osmoregulation. The latter suggestion is supported, in part, by our observation that in vivo oGH treatment (2 mu g/g body wt) stimulated gill Na+,K+-ATPase activity. (C) 1994 Academic Press, Inc.
引用
收藏
页码:483 / 494
页数:12
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