Caspase-mediated cleavage of ATM during cisplatin-induced tubular cell apoptosis: Inactivation of its kinase activity toward p53

Jinzhao Wang, Navjotsingh Pabla, Cong Yi Wang, Weixin Wang, Patricia V Schoenlein, Zheng Dong

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Cisplatin induces renal cell injury and death, resulting in nephrotoxicity that limits its use in cancer therapy. Using cell culture models, recent work has suggested the involvement of p53 in renal cell apoptosis during cisplatin treatment. However, the signals upstream of p53 remain elusive. ATM and ATR are critical regulators of p53 under various conditions of DNA damage. Here, we show that ATM, and not ATR, was proteolytically cleaved into specific fragments of ∼210 and 150 kDa during cisplatin-induced tubular cell apoptosis. ATM cleavage was paralleled by the development of apoptosis. VAD, a broad-spectrum inhibitor of caspases, attenuated the cleavage of ATM, whereas the inhibitors of specific caspases were less effective. In caspase-3-deficient MCF-7 cells, ATM was cleaved, releasing the 210- but not the 150-kDa fragment. Recombinant caspase-3 was much more effective than caspase-7 in cleaving ATM that was immunoprecipitated from cell lysates. During cisplatin incubation, VAD protected ATM and enhanced p53 phosphorylation. In vitro assay of protein kinase activity further showed that ATM immunoprecipitated from cisplatin-treated cells had significantly lower kinase activity toward p53 than that from control cells. Importantly, the protein kinase activity was restored in ATM that was protected by VAD during cisplatin incubation. ATM deficiency sensitized the cells to cisplatin-induced apoptosis, suggesting a cytoprotective role of ATM in this experimental model. Thus proteolysis of ATM by caspases may inactivate this regulatory molecule to facilitate the progression of apoptosis.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Renal Physiology
Volume291
Issue number6
DOIs
StatePublished - Dec 14 2006

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Caspases
Cisplatin
Phosphotransferases
Apoptosis
Caspase Inhibitors
Caspase 3
Protein Kinases
Caspase 7
Kidney
MCF-7 Cells
Proteolysis
DNA Damage
Cell Death
Theoretical Models
Cell Culture Techniques
Phosphorylation
Wounds and Injuries
Neoplasms

Keywords

  • ATR
  • DNA damage
  • Kidney
  • Nephrotoxicity
  • Proteolysis

ASJC Scopus subject areas

  • Physiology
  • Urology

Cite this

Caspase-mediated cleavage of ATM during cisplatin-induced tubular cell apoptosis : Inactivation of its kinase activity toward p53. / Wang, Jinzhao; Pabla, Navjotsingh; Wang, Cong Yi; Wang, Weixin; Schoenlein, Patricia V; Dong, Zheng.

In: American Journal of Physiology - Renal Physiology, Vol. 291, No. 6, 14.12.2006.

Research output: Contribution to journalArticle

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