Senescence and dysfunction of proximal tubular cells are associated with activated p53 expression by indoxyl sulfate.
Various uremic toxins accumulate in patients with chronic renal failure (CRF) and one of them is indoxyl sulfate, which accelerates the progression of CRF through unknown mechanisms. The present study investigates how indoxyl sulfate promotes CRF using the proximal tubular cell line HK-2 and CRF rats. Indoxyl sulfate inhibited serum-induced cell proliferation and promoted the activation of senescence-associated β-galactosidase, a marker of cellular senescence, and the expression of α-smooth muscle actin (α-SMA), a marker of fibrosis, through inducing p53 expression and phosphorylation. Pifithrin-α, p-nitro, a p53 inhibitor, blocked these effects. Indoxyl sulfate evoked reactive oxygen species (ROS), and the antioxidant N-acetylcysteine inhibited indoxyl sulfate-induced p53 expression and phosphorylation, as well as indoxyl sulfate-induced α-SMA expression. We previously demonstrated that although cellular senescence and fibrosis are detectable in the kidneys of CRF rats, the oral adsorbent AST-120 repressed these effects. Here, we found that β-galactosidase, p53 and α-SMA were expressed and colocalized in the renal tubules of CRF rats, whereas AST-120 decreased the expression of these genes. Taken together, these findings indicate that indoxyl sulfate induces the expression and phosphorylation of p53 though ROS production, thus inhibiting cell proliferation and promoting cellular senescence and renal fibrosis.
Shimizu
Hidehisa
H
Department of Advanced Medicine for Uremia, Nagoya University Graduate School of Medicine, Nagoya, Japan.
Bolati
Dilinaer
D
Adijiang
Ayinuer
A
Enomoto
Atsushi
A
Nishijima
Fuyuhiko
F
Dateki
Minori
M
Niwa
Toshimitsu
T
D000111:Acetylcysteine / Q000494:pharmacology; D000818:Animals; D052160:Benzothiazoles / Q000494:pharmacology; D002460:Cell Line / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D016922:Cellular Senescence / Q000187:drug effects* / Q000502:physiology; D005355:Fibrosis / Q000378:metabolism; D006801:Humans; D007200:Indican / Q000494:pharmacology*; D007676:Kidney Failure, Chronic / Q000378:metabolism / Q000503:physiopathology; D007687:Kidney Tubules, Proximal / Q000166:cytology / Q000187:drug effects* / Q000502:physiology* / Q000503:physiopathology*; D008297:Male; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000378:metabolism; D014050:Toluene / Q000031:analogs & derivatives / Q000494:pharmacology; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*
D052160:Benzothiazoles; D017382:Reactive Oxygen Species; D016159:Tumor Suppressor Protein p53; D014050:Toluene; C121565:pifithrin; D007200:Indican; D000111:Acetylcysteine