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Blood, 15 July 2001, Vol. 98, No. 2, pp. 414-421

NEOPLASIA

Apaf-1 protein deficiency confers resistance to cytochrome c-dependent apoptosis in human leukemic cells

Li Jia, Srinivasa M. Srinivasula, Feng-Ting Liu, Adrian C. Newland, Teresa Fernandes-Alnemri, Emad S. Alnemri, and Stephen M. Kelsey

From the Department of Haematology, St Bartholomew's and The Royal London School of Medicine and Dentistry, London, United Kingdom; and the Department of Microbiology and Immunology, Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, PA.

The human leukemia cell lines K562, CEM, CEM/VLB100, human leukemic blasts, and the bladder cancer J82 cell line have different sensitivities to UV light-induced apoptosis. It is reported that resistance to UV light-induced apoptosis occurs at a point in the apoptotic pathway upstream of caspase-3 but downstream of mitochondrial cytochrome c release. It is demonstrated that the block is due to deficiency of Apaf-1, a critical member of the apoptosome. Sensitivity to apoptosis was independent of caspase-9b or XIAP (inhibitors of apoptosis proteins) expression or levels of procaspase-9. Transfection of Apaf-1 conferred sensitivity to apoptosis in resistant cells. Apaf-1 deficiency may constitute a significant mode of resistance to apoptosis in human leukemia.

© 2001 by The American Society of Hematology.
 

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