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Titolo:
Juvenile coho salmon locomotion and mosaic muscle are modified by 3',3',5'-tri-iodo-L-thyronine (T-3)
Autore:
Katzman, S; Cech, JJ;
Indirizzi:
Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, Davis, CA 95616 USAUniv Calif Davis Davis CA USA 95616 & Conservat Biol, Davis, CA 95616 USA
Titolo Testata:
JOURNAL OF EXPERIMENTAL BIOLOGY
fascicolo: 10, volume: 204, anno: 2001,
pagine: 1711 - 1717
SICI:
0022-0949(200105)204:10<1711:JCSLAM>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MYOD GENE FAMILY; THYROID-HORMONE; ONCORHYNCHUS-TSHAWYTSCHA; ATLANTIC SALMON; CHINOOK SALMON; RAINBOW-TROUT; EXPRESSION; SMOLTIFICATION; THYROXINE; GROWTH;
Keywords:
tri-iodo-L-thyronine; skeletal muscle; fish; mosaic muscle; coho salmon; Oncorhynchus kisutch; swimming performance; critical swimming speed; smoltification;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Katzman, S Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616 Biol, Davis, CA 95616 USA
Citazione:
S. Katzman e J.J. Cech, "Juvenile coho salmon locomotion and mosaic muscle are modified by 3',3',5'-tri-iodo-L-thyronine (T-3)", J EXP BIOL, 204(10), 2001, pp. 1711-1717

Abstract

Studies of maximum aerobic swimming performance in smelting juvenile salmonids indicate that these animals may be aerobically compromised during downstream migration. To test our hypothesis that hyperthyroid status contributes to decreased swimming performance through modification of muscle contractility in juvenile (112 mm mean total length) coho salmon (Oncorhynchus kisutch), we measured swimming performance and isolated muscle bundle contractility of fish implanted with 3 ' ,3 ' ,5 ' -tri-iodo-L-thyronine (T-3) pellets, of fish implanted with sham pellets and of fish with no pellet implantation (control group). After 3 weeks (N=12-13), critical swimming speeds (maximum aerobic swimming speed or U-crit) were measured. Muscle bundles (N=15-16) were dissected from the hypaxial musculature and stimulated to measure the force and velocity of an isometric twitch and tetani. T-3-treated fish demonstrated visible morphological changes associated with smoltification, Mean values of U-crit were significantly decreased and the prolonged contraction (tetani) and twitch rates of contraction, relaxation and maximum force were significantly increased by Tg treatment compared with both the sham and control fish. Hematocrit, body mass and body length were not significantly affected by T-3 treatment. In conclusion, we suggest that the reported decrease in Ucrit during salmonid smoltification may be mediated by endogenous T-3-induced contractile modification of mosaic muscle fibers.

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Documento generato il 25/09/20 alle ore 21:23:57