Time-dependent expression of heat shock proteins 70 and 90 in tissues of the anoxic western painted turtle

The Journal of Experimental Biology
Valeria Ramaglia, Leslie Thomas Buck

Abstract

Expression of the constitutive Hsp73, inducible Hsp72 and Hsp90 was investigated in brain, heart, liver and skeletal muscle of the anoxia-tolerant western painted turtle Chrysemys picta bellii in response to 2, 6, 12, 18, 24 and 30 h forced dives and following 1 h recovery from 12, 24 and 30 h forced dives at 17 degrees C. During a dive, expression of all three Hsps examined remained at control levels for at least 12 h in all tissues examined except the liver, where Hsp72 showed a decrease at 12 h, reaching a significant threefold decrease by 24 h. Brain and liver Hsp73, 72 and 90 expression increased two- to threefold at 18, 24 and 30 h. Heart and muscle Hsp73 and heart Hsp90 expression remained at normoxic levels throughout the entire dive, while heart and muscle Hsp72 and muscle Hsp90 increased two- to fourfold at 24 and 30 h. Following reoxygenation, Hsp expression increased in all tissues examined. These data indicate that increased Hsp expression is not critical in the early adaptation to anoxic survival and that short-term anoxia is probably not a stress for species adapted to survive long periods without oxygen. However, the late upregulation of heat shock proteins during anoxia suggests that stress proteins play a role...Continue Reading

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Citations

Mar 10, 2007·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Matthew Edward PamenterLeslie Thomas Buck
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May 29, 2021·The Journal of Experimental Biology·Varshinie PillaiEbrahim Lari
Sep 10, 2021·The Journal of Experimental Biology·Ebrahim Lari, Leslie T Buck

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