Abstract |
Mitochondria released from injured cells activate endothelial cells (ECs), fostering inflammatory processes, including allograft rejection. The stimulator of interferon genes ( STING) senses endogenous mitochondrial DNA, triggering innate immune activation via NF-κB signaling. Here, we show that exogenous mitochondria exposure induces EC STING-NF-κB activation, promoting EC/effector memory T cell adhesion, which is abrogated by NF-κB and STING inhibitors. STING activation in mitochondrion-activated ECs is independent of canonical cGMP- AMP synthetase sensing/signaling, but rather is mediated by interferon gamma-inducible factor 16 (IFI16) and can be inhibited by IFI16 inhibition. Internalized mitochondria undergo mitofusion and STING-dependent mitophagy, leading to selective sequestration of internalized mitochondria. The exposure of donor hearts to exogenous mitochondria activates murine heart ECs in vivo. Collectively, our results suggest that IFI16-STING-NF-κB signaling regulates exogenous mitochondrion-induced EC activation and mitophagy, and exogenous mitochondria foster T cell-mediated CoBRR. These data suggest a novel, donor-directed, therapeutic approach toward mitigating perioperative allograft immunogenicity.
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Authors | Shu Li, He Xu, Mingqing Song, Brian I Shaw, Qi-Jing Li, Allan D Kirk |
Journal | American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons
(Am J Transplant)
Vol. 22
Issue 6
Pg. 1578-1592
(06 2022)
ISSN: 1600-6143 [Electronic] United States |
PMID | 35322536
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural)
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Copyright | © 2022 The American Society of Transplantation and the American Society of Transplant Surgeons. |
Chemical References |
- NF-kappa B
- Nuclear Proteins
- Phosphoproteins
- IFI16 protein, human
|
Topics |
- Animals
- Endothelial Cells
(metabolism)
- Heart Transplantation
(adverse effects)
- Humans
- Mice
- Mitochondria
(metabolism)
- NF-kappa B
(metabolism)
- Nuclear Proteins
(genetics, metabolism)
- Phosphoproteins
- Tissue Donors
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