| First Author | Wang YT | Year | 2019 |
| Journal | Am J Physiol Heart Circ Physiol | Volume | 317 |
| Issue | 2 | Pages | H472-H478 |
| PubMed ID | 31274354 | Mgi Jnum | J:277681 |
| Mgi Id | MGI:6331214 | Doi | 10.1152/ajpheart.00244.2019 |
| Citation | Wang YT, et al. (2019) Cardioprotection by the mitochondrial unfolded protein response requires ATF5. Am J Physiol Heart Circ Physiol 317(2):H472-H478 |
| abstractText | The mitochondrial unfolded protein response (UPR(mt)) is a cytoprotective signaling pathway triggered by mitochondrial dysfunction. UPR(mt) activation upregulates chaperones, proteases, antioxidants, and glycolysis at the gene level to restore proteostasis and cell energetics. Activating transcription factor 5 (ATF5) is a proposed mediator of the mammalian UPR(mt). Herein, we hypothesized pharmacological UPR(mt) activation may protect against cardiac ischemia-reperfusion (I/R) injury in an ATF5-dependent manner. Accordingly, in vivo administration of the UPR(mt) inducers oligomycin or doxycycline 6 h before ex vivo I/R injury (perfused heart) was cardioprotective in wild-type but not global Atf5(-/-) mice. Acute ex vivo UPR(mt) activation was not cardioprotective, and loss of ATF5 did not impact baseline I/R injury without UPR(mt) induction. In vivo UPR(mt) induction significantly upregulated many known UPR(mt)-linked genes (cardiac quantitative PCR and Western blot analysis), and RNA-Seq revealed an UPR(mt)-induced ATF5-dependent gene set, which may contribute to cardioprotection. This is the first in vivo proof of a role for ATF5 in the mammalian UPR(mt) and the first demonstration that UPR(mt) is a cardioprotective drug target.NEW & NOTEWORTHY Cardioprotection can be induced by drugs that activate the mitochondrial unfolded protein response (UPR(mt)). UPR(mt) protection is dependent on activating transcription factor 5 (ATF5). This is the first in vivo evidence for a role of ATF5 in the mammalian UPR(mt). |
