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  • Title: Effects of a High-Protein Diet on Kidney Injury under Conditions of Non-CKD or CKD in Mice.
    Author: Tanaka S, Wakui H, Azushima K, Tsukamoto S, Yamaji T, Urate S, Suzuki T, Abe E, Taguchi S, Yamada T, Kobayashi R, Kanaoka T, Kamimura D, Kinguchi S, Takiguchi M, Funakoshi K, Yamashita A, Ishigami T, Tamura K.
    Journal: Int J Mol Sci; 2023 Apr 24; 24(9):. PubMed ID: 37175483.
    Abstract:
    Considering the prevalence of obesity and global aging, the consumption of a high-protein diet (HPD) may be advantageous. However, an HPD aggravates kidney dysfunction in patients with chronic kidney disease (CKD). Moreover, the effects of an HPD on kidney function in healthy individuals are controversial. In this study, we employed a remnant kidney mouse model as a CKD model and aimed to evaluate the effects of an HPD on kidney injury under conditions of non-CKD and CKD. Mice were divided into four groups: a sham surgery (sham) + normal diet (ND) group, a sham + HPD group, a 5/6 nephrectomy (Nx) + ND group and a 5/6 Nx + HPD group. Blood pressure, kidney function and kidney tissue injury were compared after 12 weeks of diet loading among the four groups. The 5/6 Nx groups displayed blood pressure elevation, kidney function decline, glomerular injury and tubular injury compared with the sham groups. Furthermore, an HPD exacerbated glomerular injury only in the 5/6 Nx group; however, an HPD did not cause kidney injury in the sham group. Clinical application of these results suggests that patients with CKD should follow a protein-restricted diet to prevent the exacerbation of kidney injury, while healthy individuals can maintain an HPD without worrying about the adverse effects.
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