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A comparison of the heat shock response in juvenile and adult rainbow trout (Oncorhynchus mykiss) — implications for increased thermal sensitivity with age

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We conclude that the heat shock response is enhanced in juvenile compared with adult rainbow trout, Oncorhynchus mykiss. We have shown that the magnitude of the inducible heat shock response, as measured by increases in the heat shock protein (Hsp) Hsp70 is significantly greater in the hearts of fingerling than in adult trout following an acute (1h) heat stress at 25°C. Juvenile fish also express higher levels of constitutive Hsps (Hsc70, Hsp90) in their tissues, possibly reflecting higher rates of protein synthesis and increased chaperone function in this early life stage. This robust heat shock response in juvenile trout may contribute to a greater thermal resistance that is often observed in young salmonid fish.

Nous concluons que la réaction au choc thermique est plus importante chez les truites arc-en-ciel, Oncorhynchus mykiss, juvéniles que chez les adultes. Nous avons montré que l’intensité de la réaction induite par le choc thermique, mesurée par l’augmentation de la protéine du choc thermique (Hsp) Hsp70, est significativement plus élevée dans le cœur des fretins que dans celui des truites adultes suivant un stress thermique aigu (1 h) à 25 °C. Les jeunes poissons ont aussi une expression de concentrations plus élevées d’Hsp constitutives (Hsc70, Hsp90) dans leurs tissus, ce qui reflète probablement des taux de synthèse de protéines plus élevés et une fonction de chaperon plus importante à ce stage précoce de leur cycle biologique. Cette réaction robuste au choc thermique chez les jeunes truites peut contribuer à la résistance thermique plus élevée que l’on observe souvent chez les jeunes salmonidés.

Document Type: Research Article

Publication date: January 1, 2009

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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