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Physiol. Genomics 25: 493-501, 2006. First published April 4, 2006; doi:10.1152/physiolgenomics.00195.2005
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Thermoprotection of synaptic transmission in a Drosophila heat shock factor mutant is accompanied by increased expression of Hsp83 and DnaJ-1

¹ Departments of Biology; University of Toronto, Mississauga and Toronto, Ontario
² Physiology, University of Toronto, Mississauga and Toronto, Ontario
³ Laboratory of Cellular and Developmental Genetics, Department of Medicine and Centre de Recherche sur la Fonction, la Structure, et l'Ingénierie des Protéines, Université Laval, Ste-Foy, Quebec, Canada

In Drosophila larvae, acquired synaptic thermotolerance after heat shock has previously been shown to correlate with the induction of heat shock proteins (Hsps) including HSP70. We tested the hypothesis that synaptic thermotolerance would be significantly diminished in a temperature-sensitive strain (Drosophila heat shock factor mutant hsf⁴), which has been reported not to be able to produce inducible Hsps in response to heat shock. Contrary to our hypothesis, considerable thermoprotection was still observed at hsf⁴ larval synapses after heat shock. To investigate the cause of this thermoprotection, we conducted DNA microarray experiments to identify heat-induced transcript changes in these organisms. Transcripts of the hsp83, dnaJ-1 (hsp40), and glutathione-S-transferase gstE1 genes were significantly upregulated in hsf⁴ larvae after heat shock. In addition, increases in the levels of Hsp83 and DnaJ-1 proteins but not in the inducible form of Hsp70 were detected by Western blot analysis. The mode of heat shock administration differentially affected the relative transcript and translational changes for these chaperones. These results indicate that the compensatory upregulation of constitutively expressed Hsps, in the absence of the synthesis of the major inducible Hsp, Hsp70, could still provide substantial thermoprotection to both synapses and the whole organism.

neuromuscular junction; heat stress; thermotolerance; microarray

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				M. K. Klose, H. L. Atwood, and R. M. Robertson Hyperthermic Preconditioning of Presynaptic Calcium Regulation in Drosophila J Neurophysiol, May 1, 2008; 99(5): 2420 - 2430. [Abstract] [Full Text] [PDF]