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Indoxyl sulfate promotes apoptosis in cultured osteoblast cells

Young-Hee Kim, Kyung-Ah Kwak, Hyo-Wook Gil1

  • 1Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, 31 Soonchunhyang 6gil, Dongnam-gu, Cheonan, Chungnam 330-721, Korea. hwgil@schmc.ac.kr.

BMC Pharmacology & Toxicology
|December 3, 2013
PubMed
Abstract

Insights

Indoxyl sulfate (IS), a uremic toxin, induces osteoblast apoptosis and inhibits differentiation. This bone toxin is transported into cells via organic anion transport (OAT), leading to oxidative stress and bone damage.

Area of Science:

  • Nephrology
  • Bone Biology
  • Toxicology

Background:

  • Indoxyl sulfate (IS) is an organic anion uremic toxin linked to renal dysfunction progression.
  • Previous studies suggest IS impacts osteoblast function, but its direct role in osteoblast apoptosis remains unclear.
  • This study investigates IS as a bone toxin by examining its effects on osteoblast apoptosis and differentiation.

Purpose of the Study:

  • To determine if indoxyl sulfate (IS) induces apoptosis in osteoblasts.
  • To evaluate the impact of IS on osteoblast differentiation.
  • To elucidate the mechanism of IS-induced cellular damage in osteoblasts.

Main Methods:

  • Assessed IS effects on MC3T3-E1 osteoblast cell line.
  • Measured caspase activity, apoptosis markers, and free radical production.
  • Investigated mRNA expression of collagen type 1 and osteonectin, and alkaline phosphatase activity.
  • Examined IS uptake via organic anion transport (OAT).

Main Results:

  • IS significantly increased caspase activity and induced osteoblast apoptosis.
  • Free radical production and oxidative stress were elevated in a dose-dependent manner with IS exposure.
  • IS inhibited osteoblast differentiation markers, including alkaline phosphatase activity and mRNA expression of collagen type 1 and osteonectin.
  • Organic anion transport (OAT) mediated IS uptake; OAT inhibition improved cell viability and reduced reactive oxygen species.

Conclusions:

  • Indoxyl sulfate (IS) acts as a bone toxin.
  • IS induces osteoblast apoptosis and inhibits differentiation.
  • IS-mediated oxidative stress, via OAT uptake, contributes to its detrimental effects on bone cells.

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