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Background  Arachidonic acid (AA) is oxidized by cytochrome P450s (CYPs) to form epoxyeicosatrienoic acids (EETs), compounds that modulate ion transport, gene expression, and vasorelaxation. Both CYP2Cs and CYP2Js are involved in kidney EET epoxidation.    Methods  In this study, we used a  CYP2C11 -null rat model to explore the in vivo effects of CYP2C11 on vasorelaxation. For 2 months,  CYP2C11 -null and wild-type (WT) Sprague-Dawley rats were either fed normal lab (0.3% (w/w) sodium chloride) or high-salt (8% (w/w) sodium chloride) diets. Subsequently, an invasive method was used to determine blood pressure. Next, western blots, quantitative PCR, and immunohistochemistry were used to determine renal expression of CYPs involved in AA metabolism.    Results  Among  CYP2C11 -null rats, a high-salt diet (females: 156.79 ± 15.89 mm Hg, males: 130.25 ± 16.76 mm Hg,  n  = 10) resulted in significantly higher blood pressure than a normal diet (females: 118.05 ± 8.43 mm Hg,  P  < 0.01; males: 115.15 ± 11.45 mm Hg,  P  < 0.05,  n  = 10). Compared with WT rats under the high-salt diet, western blots showed that  CYP2C11 -null rats had higher renal expression of CYP2J2 and CYP4A. This was consistent with the results of immunohistochemistry and the qPCR, respectively. The two rat strains did not differ in the renal expression of CYP2C23 or CYP2C24.    Conclusion  Our findings suggested that CYP2C11 plays an important role in lowering blood pressure under the challenge of a high-salt diet.

CYP2C11 played a significant role in down-regulating rat blood pressure under the challenge of a high-salt diet