Abstract: In patients with end-stage renal disease, not only renal clearance but also hepatic clearance is known to be impaired. For instance, the concentration of erythromycin, a substrate of cytochrome P450 3A4 (CYP3A4), has been reported to be elevated in patients with end-stage renal disease. The purpose of this study is to elucidate the reason for the decrease in hepatic clearance in patients with end-stage renal disease. Deproteinized pooled sera were used to assess the effects of low-molecular-weight uremic toxins on CYP3A4 activity in human liver microsomes and human LS180 cells. Four uremic toxins (3-carboxy-4-methyl-5-propyl-2-furanpropanoic acid, hippuric acid, indole-3-acetic acid, and 3-indoxyl sulfate) present at high concentrations in uremic serum were also studied. Simultaneous treatment of uremic serum (less than 10%) or uremic toxins did not affect testosterone 6β-hydroxylation in human liver microsomes. On the other hand, pretreatment of each serum activates CYP3A4 in LS180 cells, and the increased CYP3A4 activity in uremic serum-treated cells was smaller than normal serum-treated cells. In addition, CYP3A4 and CYP24A1 mRNA levels also increased in LS180 cells exposed to normal serum, and this effect was reduced in uremic serum-treated cells and in cells exposed to uremic serum added to normal serum. Furthermore, addition of 1,25-dihydroxyvitamin D to uremic serum partially restored the serum effect on CYP3A4 expression. The present study suggests that the decrease of 1,25-dihydroxyvitamin D and the accumulation of uremic toxins contributed to the decreased hepatic clearance of CYP3A4 substrates in patients with end-stage renal disease.
Keywords: CYP3A4; 1,25-dihydroxyvitamin D; uremic toxins; end-stage renal disease; vitamin D receptor (VDR)
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Tsujimoto, M.; Nagano, Y.; Hosoda, S.; Shiraishi, A.; Miyoshi, A.; Hiraoka, S.; Furukubo, T.; Izumi, S.; Yamakawa, T.; Minegaki, T.; Nishiguchi, K. Effects of Decreased Vitamin D and Accumulated Uremic Toxin on Human CYP3A4 Activity in Patients with End-Stage Renal Disease. Toxins 2013, 5, 1475-1485.
Tsujimoto M, Nagano Y, Hosoda S, Shiraishi A, Miyoshi A, Hiraoka S, Furukubo T, Izumi S, Yamakawa T, Minegaki T, Nishiguchi K. Effects of Decreased Vitamin D and Accumulated Uremic Toxin on Human CYP3A4 Activity in Patients with End-Stage Renal Disease. Toxins. 2013; 5(8):1475-1485.
Tsujimoto, Masayuki; Nagano, Yui; Hosoda, Satomi; Shiraishi, Asuka; Miyoshi, Ayaka; Hiraoka, Shima; Furukubo, Taku; Izumi, Satoshi; Yamakawa, Tomoyuki; Minegaki, Tetsuya; Nishiguchi, Kohshi. 2013. "Effects of Decreased Vitamin D and Accumulated Uremic Toxin on Human CYP3A4 Activity in Patients with End-Stage Renal Disease." Toxins 5, no. 8: 1475-1485.