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Sparks R, Lui A, Bader D, Patel R, Murr M, Guida W, Fratti R, Patel NA. A specific small-molecule inhibitor of protein kinase CδI activity improves metabolic dysfunction in human adipocytes from obese individuals. J Biol Chem 2019; 294:14896-14910. [PMID: 31413114 DOI: 10.1074/jbc.ra119.008777] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 07/11/2019] [Indexed: 12/17/2022] Open
Abstract
The metabolic consequences and sequelae of obesity promote life-threatening morbidities. PKCδI is an important elicitor of inflammation and apoptosis in adipocytes. Here we report increased PKCδI activation via release of its catalytic domain concurrent with increased expression of proinflammatory cytokines in adipocytes from obese individuals. Using a screening strategy of dual recognition of PKCδI isozymes and a caspase-3 binding site on the PKCδI hinge domain with Schrödinger software and molecular dynamics simulations, we identified NP627, an organic small-molecule inhibitor of PKCδI. Characterization of NP627 by surface plasmon resonance (SPR) revealed that PKCδI and NP627 interact with each other with high affinity and specificity, SPR kinetics revealed that NP627 disrupts caspase-3 binding to PKCδI, and in vitro kinase assays demonstrated that NP627 specifically inhibits PKCδI activity. The SPR results also indicated that NP627 affects macromolecular interactions between protein surfaces. Of note, release of the PKCδI catalytic fragment was sufficient to induce apoptosis and inflammation in adipocytes. NP627 treatment of adipocytes from obese individuals significantly inhibited PKCδI catalytic fragment release, decreased inflammation and apoptosis, and significantly improved mitochondrial metabolism. These results indicate that PKCδI is a robust candidate for targeted interventions to manage obesity-associated chronic inflammatory diseases. We propose that NP627 may also be used in other biological systems to better understand the impact of caspase-3-mediated activation of kinase activity.
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Affiliation(s)
- Robert Sparks
- Department of Biochemistry, University of Illinois, Urbana-Champaign, Illinois 61801
| | - Ashley Lui
- Department of Molecular Medicine, University of South Florida, Tampa, Florida 33612
| | - Deena Bader
- James A. Haley Veterans Hospital, Tampa, Florida 33612
| | - Rekha Patel
- Department of Chemistry, University of South Florida, Tampa, Florida 33612
| | - Michel Murr
- Surgery Department, University of Central Florida, Orlando, Florida 32816.,Bariatric and Metabolic Institute, AdventHealth, Tampa, Florida 33612
| | - Wayne Guida
- Department of Chemistry, University of South Florida, Tampa, Florida 33612
| | - Rutilio Fratti
- Department of Biochemistry, University of Illinois, Urbana-Champaign, Illinois 61801
| | - Niketa A Patel
- Department of Molecular Medicine, University of South Florida, Tampa, Florida 33612 .,James A. Haley Veterans Hospital, Tampa, Florida 33612
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Walker M, Caldwell RW, Yoon Y, Nguyen TT, Johnson JA. δPKC interaction with the d subunit of F1Fo ATP synthase impairs energetics and exacerbates ischemia/reperfusion injury in isolated rat hearts. J Mol Cell Cardiol 2015; 89:232-40. [PMID: 26519110 DOI: 10.1016/j.yjmcc.2015.10.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/22/2015] [Accepted: 10/23/2015] [Indexed: 01/04/2023]
Abstract
Previously, we demonstrated protection against hypoxic injury in neonatal cardiac myocytes and reduced release of cardiac troponin I from perfused rat hearts by a novel peptide inhibitor [NH2-YGRKKRRQRRRMLATRALSLIGKRAISTSVCAGRKLALKTIDWVSFDYKDDDDK-] of the delta protein kinase C (δPKC) interaction with the "d" subunit of mitochondrial F1Fo ATP synthase (dF1Fo). This peptide was developed in our laboratory and contains: an HIV-Tat protein transduction domain; a mitochondrial targeting motif; the δPKC-dF1Fo inhibitor sequence; and a FLAG epitope. In the present study the δPKC-dF1Fo inhibitor attenuated co-immunoprecipitation of δPKC with dF1Fo, improved recovery of contractility, diminished levels of tissue t-carbonyls and 4-hydroxy-2-nonenal (HNE), and reduced 2,3,5-triphenyltetrazolium chloride-monitored infarct size following simulated global ischemia/reperfusion (IR) exposures. Perfusion of hearts with this peptide prior to IR enhanced ATP levels 2.1-fold, improved ADP (state 3)- and FCCP (maximal)-stimulated respiration in mitochondrial oxygen consumption assays, and attenuated Ca(++)-induced mitochondrial swelling following ischemic injury. Mitochondrial membrane potential (assessed by JC-1) was also improved 1.6-fold by the inhibitor in hearts subsequently exposed to IR injury. Brief IR exposures did not cause mitochondrial loss of cytochrome c in the presence or absence of the inhibitor. Additionally, the inhibitor did not modify accumulation of the autophagy marker LC3II after brief IR injury. Our results support the potential for this first-in-class peptide as a translational agent for combating cardiac IR injury.
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Affiliation(s)
- Matthew Walker
- Department of Pharmacology & Toxicology, Georgia Regents University, Augusta, GA 30912-2300, United States
| | - Robert W Caldwell
- Department of Pharmacology & Toxicology, Georgia Regents University, Augusta, GA 30912-2300, United States
| | - Yisang Yoon
- Department of Physiology, Georgia Regents University, Augusta, GA 30912-2300, United States
| | - Tiffany T Nguyen
- Department of Pathology, Walter Reed National Military Medical Center, Bethesda, MD 20889, United States
| | - John A Johnson
- Department of Pharmacology & Toxicology, Georgia Regents University, Augusta, GA 30912-2300, United States.
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Long Q, Yang K, Yang Q. Regulation of mitochondrial ATP synthase in cardiac pathophysiology. AMERICAN JOURNAL OF CARDIOVASCULAR DISEASE 2015; 5:19-32. [PMID: 26064790 PMCID: PMC4447074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Accepted: 03/10/2015] [Indexed: 06/04/2023]
Abstract
Mitochondrial function is paramount to energy homeostasis, metabolism, signaling, and apoptosis in cells. Mitochondrial complex V (ATP synthase), a molecular motor, is the ultimate ATP generator and a key determinant of mitochondrial function. ATP synthase catalyzes the final coupling step of oxidative phosphorylation to supply energy in the form of ATP. Alterations at this step will crucially impact mitochondrial respiration and hence cardiac performance. It is well established that cardiac contractility is strongly dependent on the mitochondria, and that myocardial ATP depletion is a key feature of heart failure. ATP synthase dysfunction can cause and exacerbate human diseases, such as cardiomyopathy and heart failure. While ATP synthase has been extensively studied, essential questions related to how the regulation of ATP synthase determines energy metabolism in the heart linger and therapies targeting this important mechanism remain scarce. This review will visit the main findings, identify unsolved issues and provide insights into potential future perspectives related to the regulation of ATP synthase and cardiac pathophysiology.
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Affiliation(s)
- Qinqiang Long
- Department of Nutrition Sciences, University of Alabama at Birmingham Birmingham, Alabama 35294, USA
| | - Kevin Yang
- Department of Nutrition Sciences, University of Alabama at Birmingham Birmingham, Alabama 35294, USA
| | - Qinglin Yang
- Department of Nutrition Sciences, University of Alabama at Birmingham Birmingham, Alabama 35294, USA
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Ge L, Zhu MM, Yang JY, Wang F, Zhang R, Zhang JH, Shen J, Tian HF, Wu CF. Differential proteomic analysis of the anti-depressive effects of oleamide in a rat chronic mild stress model of depression. Pharmacol Biochem Behav 2015; 131:77-86. [PMID: 25641667 DOI: 10.1016/j.pbb.2015.01.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 01/20/2015] [Accepted: 01/23/2015] [Indexed: 01/12/2023]
Abstract
Depression is a complex psychiatric disorder, and its etiology and pathophysiology are not completely understood. Depression involves changes in many biogenic amine, neuropeptide, and oxidative systems, as well as alterations in neuroendocrine function and immune-inflammatory pathways. Oleamide is a fatty amide which exhibits pharmacological effects leading to hypnosis, sedation, and anti-anxiety effects. In the present study, the chronic mild stress (CMS) model was used to investigate the antidepressant-like activity of oleamide. Rats were exposed to 10weeks of CMS or control conditions and were then subsequently treated with 2weeks of daily oleamide (5mg/kg, i.p.), fluoxetine (10mg/kg, i.p.), or vehicle. Protein extracts from the hippocampus were then collected, and hippocampal maps were generated by way of two-dimensional gel electrophoresis (2-DE). Altered proteins induced by CMS and oleamide were identified through mass spectrometry and database searches. Compared to the control group, the CMS rats exhibited significantly less body weight gain and decreased sucrose consumption. Treatment with oleamide caused a reversal of the CMS-induced deficit in sucrose consumption. In the proteomic analysis, 12 protein spots were selected and identified. CMS increased the levels of adenylate kinase isoenzyme 1 (AK1), nucleoside diphosphate kinase B (NDKB), histidine triad nucleotide-binding protein 1 (HINT1), acyl-protein thioesterase 2 (APT-2), and glutathione S-transferase A4 (GSTA4). Compared to the CMS samples, seven spots changed significantly following treatment with oleamide, including GSTA4, glutathione S-transferase A6 (GSTA6), GTP-binding nuclear protein Ran (Ran-GTP), ATP synthase subunit d, transgelin-3, small ubiquitin-related modifier 2 (SUMO2), and eukaryotic translation initiation factor 5A-1 (eIF5A1). Of these seven proteins, the level of eIF5A1 was up-regulated, whereas the remaining proteins were down-regulated. In conclusion, oleamide has antidepressant-like properties in the CMS rat model. The identification of proteins altered by CMS and oleamide treatment provides support for targeting these proteins in the development of novel therapies for depression.
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Affiliation(s)
- Lin Ge
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Ming-Ming Zhu
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Jing-Yu Yang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Fang Wang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Rong Zhang
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Jing-Hai Zhang
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, Shenyang 110016, PR China
| | - Jing Shen
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Central Laboratory, Beijing Cancer Hospital & Institute, Beijing 100142, PR China
| | - Hui-Fang Tian
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Central Laboratory, Beijing Cancer Hospital & Institute, Beijing 100142, PR China
| | - Chun-Fu Wu
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, PR China.
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Antoniel M, Giorgio V, Fogolari F, Glick GD, Bernardi P, Lippe G. The oligomycin-sensitivity conferring protein of mitochondrial ATP synthase: emerging new roles in mitochondrial pathophysiology. Int J Mol Sci 2014; 15:7513-36. [PMID: 24786291 PMCID: PMC4057687 DOI: 10.3390/ijms15057513] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2014] [Revised: 04/18/2014] [Accepted: 04/21/2014] [Indexed: 01/08/2023] Open
Abstract
The oligomycin-sensitivity conferring protein (OSCP) of the mitochondrial F(O)F1 ATP synthase has long been recognized to be essential for the coupling of proton transport to ATP synthesis. Located on top of the catalytic F1 sector, it makes stable contacts with both F1 and the peripheral stalk, ensuring the structural and functional coupling between F(O) and F1, which is disrupted by the antibiotic, oligomycin. Recent data have established that OSCP is the binding target of cyclophilin (CyP) D, a well-characterized inducer of the mitochondrial permeability transition pore (PTP), whose opening can precipitate cell death. CyPD binding affects ATP synthase activity, and most importantly, it decreases the threshold matrix Ca²⁺ required for PTP opening, in striking analogy with benzodiazepine 423, an apoptosis-inducing agent that also binds OSCP. These findings are consistent with the demonstration that dimers of ATP synthase generate Ca²⁺-dependent currents with features indistinguishable from those of the PTP and suggest that ATP synthase is directly involved in PTP formation, although the underlying mechanism remains to be established. In this scenario, OSCP appears to play a fundamental role, sensing the signal(s) that switches the enzyme of life in a channel able to precipitate cell death.
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Affiliation(s)
- Manuela Antoniel
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/B, 35121 Padua, Italy.
| | - Valentina Giorgio
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/B, 35121 Padua, Italy.
| | - Federico Fogolari
- Department of Biomedical Sciences, University of Udine, p.le Kolbe, 33100 Udine, Italy.
| | - Gary D Glick
- Department of Chemistry, Graduate Program in Immunology, University of Michigan, Ann Arbor, MI 48109, USA.
| | - Paolo Bernardi
- Department of Biomedical Sciences, University of Padova, via Ugo Bassi 58/B, 35121 Padua, Italy.
| | - Giovanna Lippe
- Department of Food Science, University of Udine, via Sondrio 2/A, 33100 Udine, Italy.
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Sugawara K, Fujikawa M, Yoshida M. Screening of protein kinase inhibitors and knockdown experiments identified four kinases that affect mitochondrial ATP synthesis activity. FEBS Lett 2013; 587:3843-7. [PMID: 24157360 DOI: 10.1016/j.febslet.2013.10.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 10/10/2013] [Indexed: 01/23/2023]
Abstract
Mitochondrial ATP synthase, a major ATP supplier in respiring cells, should be regulated in amount and in activity to respond to the varying demands of cells for ATP. We screened 80 protein kinase inhibitors and found that HeLa cells treated with four inhibitors exhibited reduced mitochondrial ATP synthesis activity. Consistently, knockdown of their target kinases (PKA, PKCδ, CaMKII and smMLCK) resulted in a decrease in mitochondrial ATP synthesis activity. Among them, mitochondria of smMLCK-knockdown cells contained only a small amount of ATP synthase, while the α- and β-subunits of ATP synthase were produced normally, suggesting that smMLCK affects assembly (or decay) of ATP synthase.
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Affiliation(s)
- Kanako Sugawara
- International Cooperative Research Project (ICORP), ATP Synthesis Regulation Project, Japan Science and Technology Agency, Aomi 2-3-6, Tokyo 135-0064, Japan; Department of Molecular Bioscience, Kyoto Sangyo University, Kamigamo-Motoyama, Kyoto 603-8555, Japan
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Ogbi M, Obi I, Johnson JA. An inhibitor of the δPKC interaction with the d subunit of F1Fo ATP synthase reduces cardiac troponin I release from ischemic rat hearts: utility of a novel ammonium sulfate precipitation technique. PLoS One 2013; 8:e70580. [PMID: 23936451 PMCID: PMC3731279 DOI: 10.1371/journal.pone.0070580] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Accepted: 06/20/2013] [Indexed: 11/19/2022] Open
Abstract
We have previously reported protection against hypoxic injury by a cell-permeable, mitochondrially-targeted δPKC-d subunit of F1Fo ATPase (dF1Fo) interaction inhibitor [NH2-YGRKKRRQRRRMLA TRALSLIGKRAISTSVCAGRKLALKTIDWVSFDYKDDDDK-COOH] in neonatal cardiac myo-cytes. In the present work we demonstrate the partitioning of this peptide to the inner membrane and matrix of mitochondria when it is perfused into isolated rat hearts. We also used ammonium sulfate ((NH4)2SO4) and chloroform/methanol precipitation of heart effluents to demonstrate reduced card-iac troponin I (cTnI) release from ischemic rat hearts perfused with this inhibitor. 50% (NH4)2SO4 saturation of perfusates collected from Langendorff rat heart preparations optimally precipitated cTnI, allowing its detection in Western blots. In hearts receiving 20 min of ischemia followed by 30, or 60 min of reperfusion, the Mean±S.E. (n=5) percentage of maximal cTnI release was 30 ± 7 and 60 ± 17, respectively, with additional cTnI release occurring after 150 min of reperfusion. Perfusion of hearts with the δPKC-dF1Fo interaction inhibitor, prior to 20 min of ischemia and 60-150 min of reperfusion, reduced cTnI release by 80%. Additionally, we found that when soybean trypsin inhibitor (SBTI), was added to rat heart effluents, it could also be precipitated using (NH4)2SO4 and detected in western blots. This provided a convenient method for normalizing protein recoveries between groups. Our results support the further development of the δPKC-dF1Fo inhibitor as a potential therapeutic for combating cardiac ischemic injury. In addition, we have developed an improved method for the detection of cTnI release from perfused rat hearts.
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Affiliation(s)
- Mourad Ogbi
- Department of Pharmacology & Toxicology and Program in Regenerative Medicine, Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, Georgia, United States of America
| | - Ijeoma Obi
- Department of Pharmacology & Toxicology and Program in Regenerative Medicine, Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, Georgia, United States of America
| | - John A. Johnson
- Department of Pharmacology & Toxicology and Program in Regenerative Medicine, Institute of Molecular Medicine and Genetics, Georgia Regents University, Augusta, Georgia, United States of America
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Figueira TR, Barros MH, Camargo AA, Castilho RF, Ferreira JCB, Kowaltowski AJ, Sluse FE, Souza-Pinto NC, Vercesi AE. Mitochondria as a source of reactive oxygen and nitrogen species: from molecular mechanisms to human health. Antioxid Redox Signal 2013; 18:2029-74. [PMID: 23244576 DOI: 10.1089/ars.2012.4729] [Citation(s) in RCA: 304] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Mitochondrially generated reactive oxygen species are involved in a myriad of signaling and damaging pathways in different tissues. In addition, mitochondria are an important target of reactive oxygen and nitrogen species. Here, we discuss basic mechanisms of mitochondrial oxidant generation and removal and the main factors affecting mitochondrial redox balance. We also discuss the interaction between mitochondrial reactive oxygen and nitrogen species, and the involvement of these oxidants in mitochondrial diseases, cancer, neurological, and cardiovascular disorders.
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Affiliation(s)
- Tiago R Figueira
- Department of Clinical Pathology, Faculty of Medical Sciences, State University of Campinas, Campinas, Brazil
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Protein kinase C beta in postischemic brain mitochondria. Mitochondrion 2012; 12:138-43. [DOI: 10.1016/j.mito.2011.06.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Revised: 04/06/2011] [Accepted: 06/10/2011] [Indexed: 11/23/2022]
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