title: p53RDL1 regulates p53-dependent apoptosis.
abstract: Although a number of targets for p53 have been reported, the mechanism of p53-dependent apoptosis still remains to be elucidated. Here we report a new p53 target-gene, designated p53RDL1 (p53-regulated receptor for death and life; also termed UNC5B). The p53RDL1 gene product contains a cytoplasmic carboxy-terminal death domain that is highly homologous to rat Unc5H2, a dependence receptor involved in the regulation of apoptosis, as well as in axon guidance and migration of neural cells. We found that p53RDL1 mediated p53-dependent apoptosis. Conversely, when p53RDL1 interacted with its ligand, Netrin-1, p53-dependent apoptosis was blocked. Therefore, p53RDL1 seems to be a previously un-recognized target of p53 that may define a new pathway for p53-dependent apoptosis. We suggest that p53 might regulate the survival of damaged cells by balancing the regulation of Netrin-p53RDL1 signalling, and cell death through cleavage of p53RDL1 for apoptosis.
authors.affiliation: Human Genome Center, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.
authors.forename: Chizu
authors.initials: C
authors.lastname: Tanikawa
authors.forename: Koichi
authors.initials: K
authors.lastname: Matsuda
authors.forename: Seisuke
authors.initials: S
authors.lastname: Fukuda
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Arakawa
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers; D018076:DNA, Complementary; D006801:Humans; D007150:Immunohistochemistry; D008969:Molecular Sequence Data; D009414:Nerve Growth Factors / Q000502:physiology; D000075386:Netrin Receptors; D000075388:Netrin-1; D051381:Rats; D011956:Receptors, Cell Surface / Q000235:genetics / Q000502:physiology*; D015398:Signal Transduction; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000502:physiology*; D025521:Tumor Suppressor Proteins
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; C000617351:NTN1 protein, human; D009414:Nerve Growth Factors; D000075386:Netrin Receptors; C000617354:Ntn1 protein, rat; D011956:Receptors, Cell Surface; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; D000075388:Netrin-1