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It was previously demonstrated that Paracentrotus lividus Hsp56 mitochondrial chaperonin is constitutively expressed during development, that it increases after heat-shock and cadmium treatment, and that it has a specific territorial distribution, both in normal and heat-shocked embryos, as shown by immunolocalization experiments. In this work, we analyzed by Western blot the territorial distribution of the protein in plutei exposed to heat-shock or sublethal cadmium concentrations, and we found that Hsp56 increases in both ectodermal and endodermal cells. Moreover, by “in situ” hybridization, we looked at Hsp56 mRNA during normal development and under stress conditions. We found that the territorial distribution of the messenger changes during development and that its amount is steadily increased in stressed embryos. Finally, by T1 RNase assay, we identified a cytoplasmic factor that binds to the region of Hsp56 messenger containing the 5’UTR.

Hsp56 protein and mRNA distribution in normal and stressedP. lividusembryos