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The LUBAC participates in lysophosphatidic acid-induced NF-κB activation.
Douanne, Tiphaine; Chapelier, Sarah; Rottapel, Robert; Gavard, Julie; Bidère, Nicolas.
Afiliação
  • Douanne T; Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France.
  • Chapelier S; Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France.
  • Rottapel R; Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada.
  • Gavard J; Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France; Institut de Cancérologie de l'Ouest, Site René Gauducheau, 44800 Saint-Herblain, France.
  • Bidère N; Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France. Electronic address: nicolas.bidere@inserm.fr.
Cell Immunol ; 353: 104133, 2020 07.
Article em En | MEDLINE | ID: mdl-32450431
The natural bioactive glycerophospholipid lysophosphatidic acid (LPA) binds to its cognate G protein-coupled receptors (GPCRs) on the cell surface to promote the activation of several transcription factors, including NF-κB. LPA-mediated activation of NF-κB relies on the formation of a signalosome that contains the scaffold CARMA3, the adaptor BCL10 and the paracaspase MALT1 (CBM complex). The CBM complex has been extensively studied in lymphocytes, where it links antigen receptors to NF-κB activation via the recruitment of the linear ubiquitin assembly complex (LUBAC), a tripartite complex of HOIP, HOIL1 and SHARPIN. Moreover, MALT1 cleaves the LUBAC subunit HOIL1 to further enhance NF-κB activation. However, the contribution of the LUBAC downstream of GPCRs has not been investigated. By using murine embryonic fibroblasts from mice deficient for HOIP, HOIL1 and SHARPIN, we report that the LUBAC is crucial for the activation of NF-κB in response to LPA. Further echoing the situation in lymphocytes, LPA unbridles the protease activity of MALT1, which cleaves HOIL1 at the Arginine 165. The expression of a MALT1-insensitive version of HOIL1 reveals that this processing is involved in the optimal production of the NF-κB target cytokine interleukin-6. Lastly, we provide evidence that the guanine exchange factor GEF-H1 favors MALT1-mediated cleavage of HOIL1 and NF-κB signaling in this context. Together, our results unveil a critical role for the LUBAC as a positive regulator of NF-κB signaling downstream of LPA receptors.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Lisofosfolipídeos / NF-kappa B / Complexos Multiproteicos Limite: Animals / Humans Idioma: En Revista: Cell Immunol Ano de publicação: 2020 Tipo de documento: Article País de afiliação: França

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Lisofosfolipídeos / NF-kappa B / Complexos Multiproteicos Limite: Animals / Humans Idioma: En Revista: Cell Immunol Ano de publicação: 2020 Tipo de documento: Article País de afiliação: França