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Molecular and Cellular Biology, February 2004, p. 1570-1581, Vol. 24, No. 4
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.4.1570-1581.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Proapoptotic BH3-Only Bcl-2 Family Member Bik/Blk/Nbk Is Expressed in Hemopoietic and Endothelial Cells but Is Redundant for Their Programmed Death

Leigh Coultas, Philippe Bouillet, Edouard G. Stanley,{dagger} Thomas C. Brodnicki, Jerry M. Adams, and Andreas Strasser*

The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3050, Australia

Received 9 November 2003/ Returned for modification 13 November 2003/ Accepted 18 November 2003

The BH3-only members of the Bcl-2 protein family are essential for initiation of programmed cell death and stress-induced apoptosis. We have determined the expression pattern in mice of the BH3-only protein Bik, also called Blk or Nbk, and examined its physiological function by gene targeting. We found that Bik is expressed widely in the hematopoietic compartment and in endothelial cells of the venous but not arterial lineages. Nevertheless, its loss did not increase the numbers of such cells in mice or protect hematopoietic cells in vitro from apoptosis induced by cytokine withdrawal or diverse other cytotoxic stimuli. Moreover, whereas loss of the BH3-only protein Bim rescued mice lacking the prosurvival protein Bcl-2 from fatal polycystic kidney disease and lymphopenia, loss of Bik did not. These results indicate that any function of Bik in programmed cell death and stress-induced apoptosis must overlap that of other BH3-only proteins.

* Corresponding author. Mailing address: Molecular Genetics of Cancer Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia. Phone: 61 3 9345 2624. Fax: 61 3 9347 0852. E-mail: strasser{at}wehi.edu.au.

{dagger} Present address: Centre for Early Human Development, Monash Institute for Reproduction and Development, Clayton, Victoria 3168, Australia.

Molecular and Cellular Biology, February 2004, p. 1570-1581, Vol. 24, No. 4
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.4.1570-1581.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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