The lysophosphatidic acid 2 receptor mediates down-regulation of Siva-1 to promote cell survival

Fang Tsyr Lin, Yun Ju Lai, Natalia Makarova, Gabor Tigyi, Weei Chin Lin

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Lysophosphatidic acid (LPA) promotes cell survival through the activation of G protein-coupled LPA receptors. However, whether different LPA receptors activate distinct anti-apoptotic signaling pathways is not yet clear. Here we report a novel mechanism by which the LPA2 receptor targets the proapoptotic Siva-1 protein for LPA-dependent degradation, thereby attenuating Siva-1 function in DNA damage response. The carboxyl-terminal tail of the LPA2 receptor, but not LPA1 or LPA3 receptor, specifically associates with the carboxyl cysteine-rich domain of Siva-1. Prolonged LPA stimulation promotes the association of Siva-1 with the LPA 2 receptor and targets both proteins for ubiquitination and degradation. As a result, adriamycin-induced Siva-1 protein stabilization is attenuated by LPA in an LPA2-dependent manner, and the function of Siva-1 in promoting DNA damage-induced apoptosis is inhibited by LPA pretreatment. Consistent with this result, inhibition of the LPA2 receptor expression increases Siva-1 protein levels and augments adriamycin-induced caspase-3 cleavage and apoptosis. Together, these findings reveal a critical and specific role for the LPA2 receptor through which LPA directly inactivates a critical component of the death machinery to promote cell survival.

Original languageEnglish (US)
Pages (from-to)37759-37769
Number of pages11
JournalJournal of Biological Chemistry
Volume282
Issue number52
DOIs
StatePublished - Dec 28 2007

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Lysophosphatidic Acid Receptors
Cell Survival
Down-Regulation
Cells
Doxorubicin
Proteins
DNA Damage
Apoptosis
Degradation
lysophosphatidic acid
DNA
Ubiquitination
GTP-Binding Proteins
Caspase 3
Machinery
Cysteine
Proteolysis
Stabilization
Chemical activation
Association reactions

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

The lysophosphatidic acid 2 receptor mediates down-regulation of Siva-1 to promote cell survival. / Lin, Fang Tsyr; Lai, Yun Ju; Makarova, Natalia; Tigyi, Gabor; Lin, Weei Chin.

In: Journal of Biological Chemistry, Vol. 282, No. 52, 28.12.2007, p. 37759-37769.

Research output: Contribution to journalArticle

Lin, Fang Tsyr ; Lai, Yun Ju ; Makarova, Natalia ; Tigyi, Gabor ; Lin, Weei Chin. / The lysophosphatidic acid 2 receptor mediates down-regulation of Siva-1 to promote cell survival. In: Journal of Biological Chemistry. 2007 ; Vol. 282, No. 52. pp. 37759-37769.
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