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The LUBAC participates in Lysophosphatidic Acid-induced NF-κB Activation

Tiphaine Douanne, Sarah Chapelier, Robert Rottapel, Julie Gavard, View ORCID ProfileNicolas Bidère
doi: https://doi.org/10.1101/2020.02.13.948125
Tiphaine Douanne
1Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France
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Sarah Chapelier
1Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France
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Robert Rottapel
2Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
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Julie Gavard
1Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France
3Institut de Cancérologie de l’Ouest, Site René Gauducheau, 44800 Saint-Herblain, France
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Nicolas Bidère
1Université de Nantes, INSERM, CNRS, CRCINA, Team SOAP, F-440000 Nantes, France
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  • ORCID record for Nicolas Bidère
  • For correspondence: nicolas.bidere@inserm.fr
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Abstract

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 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 required for the optimal production of the NF-κB target cytokine interleukin-6. Lastly, we provide evidence that the guanine exchange factor GEF-H1 activated by LPA favors MALT1-mediated cleavage of HOIL1 and NF-κB signaling. Together, our results unveil a critical role for the LUBAC as a positive regulator of NF-κB signaling downstream of GPCRs.

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Posted February 13, 2020.
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The LUBAC participates in Lysophosphatidic Acid-induced NF-κB Activation
Tiphaine Douanne, Sarah Chapelier, Robert Rottapel, Julie Gavard, Nicolas Bidère
bioRxiv 2020.02.13.948125; doi: https://doi.org/10.1101/2020.02.13.948125
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The LUBAC participates in Lysophosphatidic Acid-induced NF-κB Activation
Tiphaine Douanne, Sarah Chapelier, Robert Rottapel, Julie Gavard, Nicolas Bidère
bioRxiv 2020.02.13.948125; doi: https://doi.org/10.1101/2020.02.13.948125

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