Abstract
We evaluated the effect of heat challenge on cell viability, concanavalin A-induced proliferation and heat shock protein (HSPs) mRNA expression in peripheral mononuclear blood cells (PBMC) isolated from Creole (CR) and Large White (LW) pigs. The PBMCs were cultured for 9 h at 37°C before being subjected to heat challenge: (1) at 42°C or 45°C for 2, 4, 6 and 9 h to monitor cell viability;(2) at 45°C for 2 and 9 h followed by stimulation for 24 h at 37°C with concanavalin A to evaluate mitogen-induced proliferation; and (3) at 45°C for 3, 6 and 9 h to measure induction of HSP70.2 and HSP90 mRNA. Cell viability was affected by breed and temperature (P < 0.01), and the viability decrease caused by heat challenge was greater for LW than CR pigs. For mitogen-stimulated PBMCs, incubation at 45°C reduced lymphoblastogenesis equally in both breeds (P < 0.01). Although heat challenge for 3 and 6 h at 45°C induced expression of HSP70.2 and HSP90 mRNA, no breed difference was observed. In conclusion, differences in heat resistance between these two breeds at the whole organism level are reflected at the cellular level. Neither HSP70.2 nor HSP90 mRNA expression levels explain this effect.
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Acknowledgements
We are grateful to the team at Plateforme Tropicale d′ Experimentation Animale (PTEA), INRA-Domaine Duclos for their technical support. We acknowledge the technical staff at UMR 15 for assistance with cellular and molecular assays. J. C. Bambou was supported by a post-doctoral fellowship from le Conseil Régional de la Guadeloupe.
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Bambou, JC., Gourdine, JL., Grondin, R. et al. Effect of heat challenge on peripheral blood mononuclear cell viability: comparison of a tropical and temperate pig breed. Trop Anim Health Prod 43, 1535–1541 (2011). https://doi.org/10.1007/s11250-011-9838-9
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DOI: https://doi.org/10.1007/s11250-011-9838-9