Mechanism of CAR syndrome: Anti-recoverin antibodies are the inducers of retinal cell apoptotic death via the caspase 9- and caspase 3-dependent pathway

Sharon Shiraga, Grazyna Adamus

Research output: Contribution to journalArticle

84 Scopus citations

Abstract

Anti-recoverin autoantibodies have been associated with cancer-associated retinopathy (CAR), a paraneoplastic blinding disease. Those antibodies have been shown to induce apoptotic death of photoreceptor cells. The objective was to ascertain the mechanisms of retinal death induced by anti-recoverin antibody in vitro by examining the apoptotic pathway involved in retinal cell death. Internalization of anti-recoverin antibody or its Fab fragments by retinal cells mediated by endocytosis lead to cytotoxicity. Antibody cellular translocation induced the increase of bcl-xs and bax and the decrease in the bcl-xL protein. We detected the release of cytochrome c and down-regulation of the apaf-1 protein. This correlated with the sequential activation of caspase 9 and caspase 3, as well as the degradation of the caspase substrate PARP and the fragmentation of DNA. Our data show that anti-recoverin antibodies are inducers of apoptosis through the mitochondrial pathway involving caspases 9 and 3. We propose that a similar mechanism may be in place in patients with CAR syndrome where high levels of circulating antibodies have been associated with retinal degeneration.

Original languageEnglish (US)
Pages (from-to)72-82
Number of pages11
JournalJournal of Neuroimmunology
Volume132
Issue number1-2
DOIs
StatePublished - Nov 1 2002

Keywords

  • Autoimmunity
  • Cancer-associated retinopathy
  • Endocytosis
  • Photoreceptors
  • Recoverin
  • Retinal degeneration

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Neurology
  • Clinical Neurology

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