STING dampens the unfolded protein response to enable the presentation of self-antigens on MHC-I during inflammation
Authors:
- Ahmed M. FahmyAFAhmed M. Fahmy
- Ali AhmadiAAAli Ahmadi
- Joël LanoixJLJoël Lanoix
- Tyler CannonTCTyler Cannon
- Moustafa Nouh Badr ElemeeryMEMoustafa Nouh Badr Elemeery
- Camberly Hernandez ParedesCPCamberly Hernandez Paredes
- Benoit BarretteBBBenoit Barrette
- Yong Zhong XuYXYong Zhong Xu
- Maha IbrahimMIMaha Ibrahim
- Guillermo Arango-DuqueGAGuillermo Arango-Duque
- Eric Olivier AudemardEAEric Olivier Audemard
Preprint
Abstract
Summary: A growing body of evidence supports the contribution of the long-lasting adaptive immune system in Parkinson’s disease (PD). We showed that the PD-associated protein PINK1 negatively regulates the presentation of mitochondrial antigens (MitAP) on MHC-I molecules. In vivo evidence indicated that MitAP activation in mice, in the absence of PINK1, led to cytotoxic CD8 + T cell stimulation and severe motor impairments, reversible by L-DOPA. We show here that following TLR4 activation, MitAP is engaged through a pathway involving cGAS-STING, which acts as a rheostat to dampen the unfolded protein response (UPR). Without STING, the stress response is amplified, leading to a translational attenuation that inhibits the expression of XBP1s, a transcription factor required for MitAP. STING activity also regulates the repertoire of peptides displayed at the cell surface during inflammation, highlighting a potential role in immunosurveillance. These findings establish STING and the UPR as key immune regulators targetable for therapeutic intervention during autoimmune diseases and PD.Keywords
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