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First published online April 17, 2009
Journal of Experimental Biology 212, 1294-1301 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.028290

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Protein synthesis is lowered while 20S proteasome activity is maintained following acclimation to low temperature in juvenile spotted wolffish (Anarhichas minor Olafsen)

Simon G. Lamarre^1,*, Nathalie R. Le François^2,3, William R. Driedzic¹ and Pierre U. Blier³

¹ Ocean Sciences Centre, Memorial University of Newfoundland, St John's, Newfoundland, Canada A1C 5S7
² Biodôme de Montréal, 4777 Ave Pierre-De Coubertin, Montréal, Québec, Canada H1V 1B3
³ Département de Biologie, Université du Québec à Rimouski, Rimouski, Québec, Canada G5L 3A1

View larger version (10K): [in this window] [in a new window]   Fig. 1. The effect of temperature on specific growth rate (SGR) in (A) body mass per day and (B) body length per day of juvenile spotted wolffish. Values are means ± 95% CI (N=10); different letters indicate significant difference (P<0.05).

View larger version (5K): [in this window] [in a new window]   Fig. 2. Fulton's condition index of spotted wolffish growing at three temperatures. Values are means ± 95% CI (N=10); different letters indicate significant difference (P<0.05).

View larger version (6K): [in this window] [in a new window]   Fig. 3. Rate of protein synthesis expressed as incorporation of phenylalanine in white muscle proteins of juvenile spotted wolffish acclimated at three temperatures. Values are means ± 95% CI (N=8–10); different letters indicate significant difference (P<0.05).

View larger version (6K): [in this window] [in a new window]   Fig. 4. Activity of 20S proteasome in white muscle of juvenile spotted wolffish acclimated at different temperatures. The black bars represent activity measured at 15°C while the open bars represent the activity calculated at acclimation temperature (see text for details). Values are means ± 95% CI (N=8–10); different letters indicate significant difference (P<0.05).

View larger version (6K): [in this window] [in a new window]   Fig. 5. Activity of 20S proteasome in relation to assay temperature in white muscle of spotted wolffish acclimated at 8°C. The top equation describes the linear relation between log-transformed proteasome 20S activity and temperature (r2=0.680, P<0.001). The slope of this relationship was then used in the second equation to determine Q10. Each data point represents the mean activity of five fish ± s.d.

View larger version (5K): [in this window] [in a new window]   Fig. 6. White muscle concentration of reduced glutathione in juvenile spotted wolffish acclimated at three temperatures. Values are means ± 95% CI (N=8–10); different letters indicate significant difference (P<0.05).

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