Abstract |
c-Abl, a conserved nonreceptor tyrosine kinase, integrates genotoxic stress responses, acting as a transducer of both pro- and antiapoptotic effector pathways. Nuclear c-Abl seems to interact with the p53 homolog p73 to elicit apoptosis. Although several observations suggest that cytoplasmic localization of c-Abl is required for antiapoptotic function, the signals that mediate its antiapoptotic effect are largely unknown. Here we show that worms carrying an abl-1 deletion allele, abl-1(ok171), are specifically hypersensitive to radiation-induced apoptosis in the Caenorhabditis elegans germ line. Our findings delineate an apoptotic pathway antagonized by ABL-1, which requires sequentially the cell cycle checkpoint genes clk-2, hus-1 and mrt-2; the C. elegans p53 homolog, cep-1; and the genes encoding the components of the conserved apoptotic machinery, ced-3, ced-9 and egl-1. ABL-1 does not antagonize germline apoptosis induced by the DNA- alkylating agent ethylnitrosourea. Furthermore, worms treated with the c-Abl inhibitor STI-571 ( Gleevec; used in human cancer therapy), two newly synthesized STI-571 variants or PD166326 had a phenotype similar to that generated by abl-1(ok171). These studies indicate that ABL-1 distinguishes proapoptotic signals triggered by two different DNA-damaging agents and suggest that C. elegans might provide tissue models for development of anticancer drugs.
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Authors | Xinzhu Deng, E Randal Hofmann, Alberto Villanueva, Oliver Hobert, Paola Capodieci, Darren R Veach, Xianglei Yin, Luis Campodonico, Athanasios Glekas, Carlos Cordon-Cardo, Bayard Clarkson, William G Bornmann, Zvi Fuks, Michael O Hengartner, Richard Kolesnick |
Journal | Nature genetics
(Nat Genet)
Vol. 36
Issue 8
Pg. 906-12
(Aug 2004)
ISSN: 1061-4036 [Print] United States |
PMID | 15273685
(Publication Type: Journal Article)
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Chemical References |
- Caenorhabditis elegans Proteins
- ABL-1 protein, C elegans
- Proto-Oncogene Proteins c-abl
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Topics |
- Amino Acid Sequence
- Animals
- Apoptosis
(radiation effects)
- Caenorhabditis elegans
(genetics, radiation effects)
- Caenorhabditis elegans Proteins
(antagonists & inhibitors, genetics, physiology)
- Cell Division
- Cell Line
- Chromosome Deletion
- Genes, p53
- Models, Genetic
- Molecular Sequence Data
- Proto-Oncogene Proteins c-abl
(antagonists & inhibitors, genetics, physiology)
- Transformation, Genetic
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