Cytosolic NADP +-dependent isocitrate dehydrogenase regulates cadmium-induced apoptosis

Cadmium ions have a high affinity for thiol groups. Therefore, they may disturb many cellular functions. We recently reported that cytosolic NADP +-dependent isocitrate dehydrogenase (IDPc) functions as an antioxidant enzyme to supply NADPH, a major source of reducing equivalents to the cytosol. Cad...

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Bibliographic Details
Published in:Biochemical pharmacology 2010-04, Vol.79 (7), p.1072-1080
Main Authors: Shin, Seoung Woo, Kil, In Sup, Park, Jeen-Woo
Format: Article
Language:English
Subjects:
Antioxidant enzyme
Apoptosis
Apoptosis - drug effects
Biological and medical sciences
Cadmium
Cadmium - pharmacology
Caspase 3 - physiology
Cells, Cultured
Cytosol - enzymology
Humans
Isocitrate Dehydrogenase - antagonists & inhibitors
Isocitrate Dehydrogenase - physiology
Medical sciences
Mitochondria - drug effects
NADP - metabolism
Oxidation-Reduction
Pharmacology. Drug treatments
Redox status
RNA, Small Interfering - genetics
siRNA
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Summary:Cadmium ions have a high affinity for thiol groups. Therefore, they may disturb many cellular functions. We recently reported that cytosolic NADP +-dependent isocitrate dehydrogenase (IDPc) functions as an antioxidant enzyme to supply NADPH, a major source of reducing equivalents to the cytosol. Cadmium decreased the activity of IDPc both as a purified enzyme and in cultured cells. In the present study, we demonstrate that the knockdown of IDPc expression in HEK293 cells greatly enhances apoptosis induced by cadmium. Transfection of HEK293 cells with an IDPc small interfering RNA significantly decreased the activity of IDPc and enhanced cellular susceptibility to cadmium-induced apoptosis as indicated by the morphological evidence of apoptosis, DNA fragmentation and condensation, cellular redox status, mitochondria redox status and function, and the modulation of apoptotic marker proteins. Taken together, our results suggest that suppressing the expression of IDPc enhances cadmium-induced apoptosis of HEK293 cells by increasing disruption of the cellular redox status.
ISSN:0006-2952
1873-2968
DOI:10.1016/j.bcp.2009.11.014