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Simon JN, Vrellaku B, Monterisi S, Chu SM, Rawlings N, Lomas O, Marchal GA, Waithe D, Syeda F, Gajendragadkar PR, Jayaram R, Sayeed R, Channon KM, Fabritz L, Swietach P, Zaccolo M, Eaton P, Casadei B. Oxidation of Protein Kinase A Regulatory Subunit PKARIα Protects Against Myocardial Ischemia-Reperfusion Injury by Inhibiting Lysosomal-Triggered Calcium Release. Circulation 2021; 143:449-465. [PMID: 33185461 PMCID: PMC7846288 DOI: 10.1161/circulationaha.120.046761] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 11/09/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND Kinase oxidation is a critical signaling mechanism through which changes in the intracellular redox state alter cardiac function. In the myocardium, PKARIα (type-1 protein kinase A) can be reversibly oxidized, forming interprotein disulfide bonds in the holoenzyme complex. However, the effect of PKARIα disulfide formation on downstream signaling in the heart, particularly under states of oxidative stress such as ischemia and reperfusion (I/R), remains unexplored. METHODS Atrial tissue obtained from patients before and after cardiopulmonary bypass and reperfusion and left ventricular (LV) tissue from mice subjected to I/R or sham surgery were used to assess PKARIα disulfide formation by immunoblot. To determine the effect of disulfide formation on PKARIα catalytic activity and subcellular localization, live-cell fluorescence imaging and stimulated emission depletion super-resolution microscopy were performed in prkar1 knock-out mouse embryonic fibroblasts, neonatal myocytes, or adult LV myocytes isolated from "redox dead" (Cys17Ser) PKARIα knock-in mice and their wild-type littermates. Comparison of intracellular calcium dynamics between genotypes was assessed in fura2-loaded LV myocytes, whereas I/R-injury was assessed ex vivo. RESULTS In both humans and mice, myocardial PKARIα disulfide formation was found to be significantly increased (2-fold in humans, P=0.023; 2.4-fold in mice, P<0.001) in response to I/R in vivo. In mouse LV cardiomyocytes, disulfide-containing PKARIα was not found to impact catalytic activity, but instead led to enhanced AKAP (A-kinase anchoring protein) binding with preferential localization of the holoenzyme to the lysosome. Redox-dependent regulation of lysosomal two-pore channels by PKARIα was sufficient to prevent global calcium release from the sarcoplasmic reticulum in LV myocytes, without affecting intrinsic ryanodine receptor leak or phosphorylation. Absence of I/R-induced PKARIα disulfide formation in "redox dead" knock-in mouse hearts resulted in larger infarcts (2-fold, P<0.001) and a concomitant reduction in LV contractile recovery (1.6-fold, P<0.001), which was prevented by administering the lysosomal two-pore channel inhibitor Ned-19 at the time of reperfusion. CONCLUSIONS Disulfide modification targets PKARIα to the lysosome, where it acts as a gatekeeper for two-pore channel-mediated triggering of global calcium release. In the postischemic heart, this regulatory mechanism is critical for protection from extensive injury and offers a novel target for the design of cardioprotective therapeutics.
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Affiliation(s)
- Jillian N. Simon
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Besarte Vrellaku
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Stefania Monterisi
- Department of Physiology, Anatomy and Genetics (S.M., P.S., M.Z.), University of Oxford, United Kingdom
| | - Sandy M. Chu
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Nadiia Rawlings
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Oliver Lomas
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Gerard A. Marchal
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Dominic Waithe
- Wolfson Imaging Centre, Weatherall Institute of Molecular Medicine (D.W.), University of Oxford, United Kingdom
| | - Fahima Syeda
- Institute of Cardiovascular Sciences, University of Birmingham, United Kingdom (F.S., L.F.)
| | - Parag R. Gajendragadkar
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Raja Jayaram
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Rana Sayeed
- Cardiothoracic Surgery, Oxford Heart Centre, Oxford University Hospitals National Health Service Foundation Trust, United Kingdom (R.S.)
| | - Keith M. Channon
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
| | - Larissa Fabritz
- Institute of Cardiovascular Sciences, University of Birmingham, United Kingdom (F.S., L.F.)
- Department of Cardiology, University Hospitals Birmingham, United Kingdom (L.F.)
| | - Pawel Swietach
- Department of Physiology, Anatomy and Genetics (S.M., P.S., M.Z.), University of Oxford, United Kingdom
| | - Manuela Zaccolo
- Department of Physiology, Anatomy and Genetics (S.M., P.S., M.Z.), University of Oxford, United Kingdom
| | - Philip Eaton
- William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Charterhouse Square, United Kingdom (P.E.)
| | - Barbara Casadei
- Division of Cardiovascular Medicine, Radcliffe Department of Medicine (J.N.S., B.V., S.M.C., N.R., O.L., G.A.M., P.R.G., R.J., K.M.C., B.C.), University of Oxford, United Kingdom
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Ahmed F, Mwiza JM, Fernander M, Yahaya I, Abousaad S, Ongeri EM. Meprin-β activity modulates the β-catalytic subunit of protein kinase A in ischemia-reperfusion-induced acute kidney injury. Am J Physiol Renal Physiol 2020; 318:F1147-F1159. [PMID: 32174142 DOI: 10.1152/ajprenal.00571.2019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Meprin metalloproteases have been implicated in the progression of kidney injury. Previous work from our group has shown that meprins proteolytically process the catalytic subunit of protein kinase A (PKA-C), resulting in decreased PKA-C kinase activity. The goal of the present study was to determine the PKA-C isoforms impacted by meprin-β and whether meprin-β expression affects downstream mediators of the PKA signaling pathway in ischemia-reperfusion (IR)-induced kidney injury. IR was induced in 12-wk-old male wild-type (WT) and meprin-β knockout (βKO) mice. Madin-Darby canine kidney cells transfected with meprin-β cDNA were also subjected to 2 h of hypoxia. Western blot analysis was used to evaluate levels of total PKA-C, PKA-Cα, PKA-Cβ, phosphorylated (p-)PKA-C, and p-ERK1/2. Meprin-β expression enhanced kidney injury as indicated by levels of neutrophil gelatinase-associated lipocalin and cystatin C. IR-associated decreases were observed in levels of p-PKA-C in kidney tissue from WT mice but not βKO mice, suggesting that meprin-β expression/activity is responsible for the in vivo reduction in kinase activity. Significant increases in levels of PKA-Cβ were observed in kidney lysates for WT mice but not βKO mice at 6 h post-IR. Proximal tubule PKA-Cβ increases in WT but not βKO kidneys were demonstrated by fluorescent microscopy. Furthermore, IR-induced injury was associated with significant increases in p-ERK levels for both genotypes. The present data demonstrate that meprin-β enhances IR-induced kidney injury in part by modulating mediators of the PKA-Cβ signaling pathway.
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Affiliation(s)
- Faihaa Ahmed
- Department of Biology, North Carolina A&T State University, Greensboro, North Carolina
| | - Jean-Marie Mwiza
- Department of Biology, North Carolina A&T State University, Greensboro, North Carolina
| | - Mizpha Fernander
- Department of Biology, North Carolina A&T State University, Greensboro, North Carolina
| | - Ismaila Yahaya
- Department of Biology, North Carolina A&T State University, Greensboro, North Carolina
| | - Shaymaa Abousaad
- Department of Biology, North Carolina A&T State University, Greensboro, North Carolina
| | - Elimelda Moige Ongeri
- Department of Biology, North Carolina A&T State University, Greensboro, North Carolina
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