Mitochondria-mediated caspase-independent apoptosis induced by cadmium in normal human lung cells

Chwen Ming Shih, Jui Sheng Wu, Wun-Chang Ko, Leng-Fang Wang, Yau Huei Wei, Hsiao Fang Liang, Yen Chou Chen, Chien Tsu Chen

Research output: Contribution to journalArticle

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Abstract

Cadmium, a well-known environmental hazard, has caused serious health problems in humans and animals. Accumulating evidence suggests the cadmium toxicity is mediated by oxidative stress-induced cell death. However, the molecular signaling underlying cadmium-induced apoptosis remains unclear. In this study, we demonstrate here that cadmium induced mixed types of cell death including primary apoptosis (early apoptosis), secondary necrosis (late apoptosis), and necrosis in normal human lung cells, MRC-5, as revealed by chromatin condensation, phosphatidylserine (PS) externalization, and hypodiploid DNA content. The total apoptotic cells reached a plateau of around 40.0% after 24 h exposure of 100 μM cadmium. Pretreatment with Z-Val - Ala - Asp - fluoromethylketone (Z-VAD - fmk), a broad spectrum of caspase inhibitor, could not rescue apoptotic cells from cadmium toxicity. Coincidently, we failed to detect the activation of pro-caspase-3 and cleavage of PARP by immunoblot, which implies the apoptogenic activity of cadmium in MRC-5 cells is caspase-independent. JC-1 staining also indicated that mitochondrial depolarization is a prelude to cadmium-induced apoptosis, which was accompanied by a translocation of caspase-independent pro-apoptotic factor apoptosis-inducing factor (AIF) into the nucleus as revealed by the immunofluorescence assay. In summary, this study demonstrated for the first time that cadmium induced a caspase-independent apoptotic pathway through mitochondria-mediated AIF translocation into the nucleus.

Original languageEnglish
Pages (from-to)335-347
Number of pages13
JournalJournal of Cellular Biochemistry
Volume89
Issue number2
DOIs
Publication statusPublished - May 15 2003

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Mitochondria
Caspases
Cadmium
Apoptosis
Lung
Apoptosis Inducing Factor
Cell death
Toxicity
Cell Death
Necrosis
Cells
Caspase Inhibitors
Oxidative stress
Phosphatidylserines
Depolarization
Medical problems
Caspase 3
Chromatin
Fluorescent Antibody Technique
Condensation

Keywords

  • AIF
  • Cadmium
  • Caspase
  • Mitochondria
  • PARP

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology

Cite this

Mitochondria-mediated caspase-independent apoptosis induced by cadmium in normal human lung cells. / Shih, Chwen Ming; Wu, Jui Sheng; Ko, Wun-Chang; Wang, Leng-Fang; Wei, Yau Huei; Liang, Hsiao Fang; Chen, Yen Chou; Chen, Chien Tsu.

In: Journal of Cellular Biochemistry, Vol. 89, No. 2, 15.05.2003, p. 335-347.

Research output: Contribution to journalArticle

Shih, Chwen Ming ; Wu, Jui Sheng ; Ko, Wun-Chang ; Wang, Leng-Fang ; Wei, Yau Huei ; Liang, Hsiao Fang ; Chen, Yen Chou ; Chen, Chien Tsu. / Mitochondria-mediated caspase-independent apoptosis induced by cadmium in normal human lung cells. In: Journal of Cellular Biochemistry. 2003 ; Vol. 89, No. 2. pp. 335-347.
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