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J. Exp. Med., Volume 188, Number 11, December 7, 1998 1985-1992

Accelerated Neutrophil Apoptosis in Mice Lacking A1-a, a Subtype of the bcl-2-related A1 Gene

By Azumi Hamasaki,* Fujiro Sendo,* Keiko Nakayama,Dagger § Noriko Ishida,Dagger Izumi Negishi,parallel Kei-ichi Nakayama,Dagger and Shigetsugu HatakeyamaDagger

From the * Department of Immunology and Parasitology,  Yamagata University School of Medicine, Yamagata 990-9585, Japan; the Dagger  Department of Molecular and Cellular Biology and the § Laboratory of Embryonic and Genetic Engineering, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan; and the parallel  Department of Dermatology, Gunma University School of Medicine, Maebashi 371-8511, Japan

To elucidate the role of A1, a new member of the Bcl-2 family of apoptosis regulators active in hematopoietic cell apoptosis, we established mice lacking A1-a, a subtype of the A1 gene in mice (A1-a-/- mice). Spontaneous apoptosis of peripheral blood neutrophils of A1-a-/- mice was enhanced compared with that of either wild-type mice or heterozygous mutants (A1-a+/- mice). Neutrophil apoptosis inhibition induced by lipopolysaccharide treatment in vitro or transendothelial migration in vivo observed in wild-type mice was abolished in both A1-a-/- and A1-a+/- animals. On the other hand, the extent of tumor necrosis factor alpha -induced acceleration of neutrophil apoptosis did not differ among A1-a-/-, A1-a+/-, and wild-type mice. The descending order of A1 mRNA expression was wild-type, A1-a+/-, and A1-a-/-. Taken together, these results suggest that A1 is involved in inhibition of certain types of neutrophil apoptosis.

Key words: neutrophilapoptosisA1bcl-2-related genegene disruption


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