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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


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
Pages (from-to)37759-37769
Number of pages11
JournalJournal of Biological Chemistry
Issue number52
Publication statusPublished - 2007 Dec 28
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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