Abstract
Although the kidney is a major target in hypertension, several studies have correlated important immune alterations with the development of hypertension in spontaneously hypertensive rats (SHR), like increased secretion of pro-inflammatory cytokines, inflammatory infiltration in kidneys and thymic atrophy. Because adenosine-triphosphate-binding cassette sub-family B member 1 (ABCB1; P-glycoprotein) and adenosine-triphosphate-binding cassette sub-family C member 1 (ABCC1; multidrug resistance protein 1), two proteins first described in multidrug resistant tumors, physiologically transport several immune mediators and are required for the adequate functioning of the immune system, we aimed to measure the expression and activity of these proteins in peripheral blood mononuclear cells (PBMC), thymocytes, and also kidneys of normotensive Wistar Kyoto rats and SHR. Our results showed that ABCB1, but not ABCC1, activity was diminished (nearly 50%) in PBMC. Moreover, Abcb1b gene was downregulated in PBMC and kidney of SHR and this was not counterbalanced by an upregulation of its homolog Abcb1a, suggesting that the diminished activity is due to downregulation of the gene. No alteration was detected in ABCB1 activity in SHR thymocytes, indicating that this downregulation occurs after lymphocytes leave the primary lymphoid organs. Even though it is not known at present which parameter(s) is(are) responsible for this downregulation, it may contribute for the altered immune response observed in hypertension and to possible altered drug disposition in hypertensive individuals, resulting in greater drug interaction and increased drug toxicity.
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Acknowledgments
This work was supported by grants from Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Fundação Ary Frauzino, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, and Conselho Nacional de Desenvolvimento Científico e Tecnológico.
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Raphael C. Valente and Márcia A. M. Capella contributed equally to this work.
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Valente, R.C., Capella, L.S., Nascimento, C.R. et al. ABCB1 (P-glycoprotein) but not ABCC1 (MRP1) is downregulated in peripheral blood mononuclear cells of spontaneously hypertensive rats. Pflugers Arch - Eur J Physiol 456, 359–368 (2008). https://doi.org/10.1007/s00424-007-0397-x
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DOI: https://doi.org/10.1007/s00424-007-0397-x