Toxicoproteomic Analysis of Poly(ADP-Ribose)-Associated Proteins Induced by Oxidative Stress in Human Proximal Tubule Cells

Argel Islas-Robles, Deepthi Yedlapudi, Serrine S. Lau, Terrence J. Monks

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


2,3,5-Tris-(glutathion-S-yl)hydroquinone (TGHQ) is a nephrotoxic and nephrocarcinogenic metabolite of hydroquinone. TGHQ generates reactive oxygen species (ROS), causing DNA-strand breaks, hyperactivation of PARP-1, increases in intracellular calcium ([Ca2+]i), and cell death. PARP-1 catalyzes the attachment of ADP-ribose polymers (PAR) to target proteins. In human kidney proximal tubule cells, ROS-mediated PARP-1 hyperactivation and elevations in [Ca2+]i are reciprocally coupled. The molecular mechanism of this interaction is unclear. The aim of the present study was to identify ROS-induced PAR-Associated proteins to further understand their potential role in cell death. PAR-Associated proteins were enriched by immunoprecipitation, identified by LC-MS/MS, and relative abundance was obtained by spectral counting. A total of 356 proteins were PAR-modified following TGHQ treatment. A total of 13 proteins exhibited gene ontology annotations related to calcium. Among these proteins, the general transcription factor II-I (TFII-I) is directly involved in the modulation of [Ca2+]i. TFII-I binding to phospholipase C (PLC) leads to calcium influx via the TRPC3 channel. However, inhibition of TRPC3 or PLC had no effect on TGHQ-mediated cell death, suggesting that their loss of function may be necessary but insufficient to cause cell death. Nevertheless, TGHQ promoted a time-dependent translocation of TFII-I from the nucleus to the cytosol concomitant with a decrease in tyrosine phosphorylation in α/β-TFII-I. Therefore it is likely that ROS have an important impact on the function of TFII-I, such as regulation of transcription, and DNA translesion synthesis. Our data also shed light on PAR-mediated signaling during oxidative stress, and contributes to the development of strategies to prevent PAR-dependent cell death.

Original languageEnglish (US)
Pages (from-to)117-131
Number of pages15
JournalToxicological Sciences
Issue number1
StatePublished - Sep 1 2019


  • PAR
  • PARP-1
  • PARylation
  • PLC
  • TFII-I
  • TGHQ
  • TRPC3
  • poly(ADP-ribosylation)
  • proteomics
  • reactive oxygen species

ASJC Scopus subject areas

  • Toxicology


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