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Shih JM, Shih YM, Hou YC, Pai MH, Yeh CL, Yeh SL. Effects of fish oil-based lipid emulsion on inflammation and kidney injury in mice subjected to unilateral hind limb ischemia/reperfusion. Cytokine 2018; 111:49-57. [DOI: 10.1016/j.cyto.2018.07.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/24/2018] [Accepted: 07/31/2018] [Indexed: 02/08/2023]
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Zhang JQ, Yang QY, Xue FS, Zhang W, Yang GZ, Liao X, Meng FM. Preoperative oral thyroid hormones to prevent euthyroid sick syndrome and attenuate myocardial ischemia-reperfusion injury after cardiac surgery with cardiopulmonary bypass in children: A randomized, double-blind, placebo-controlled trial. Medicine (Baltimore) 2018; 97:e12100. [PMID: 30200092 PMCID: PMC6133632 DOI: 10.1097/md.0000000000012100] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Both euthyroid sick syndrome and myocardial ischemia-reperfusion injury are common and have been significantly associated with morbidity and mortality after pediatric cardiac surgery with cardiopulmonary bypass. This single-center, prospective, double-blind, randomized placebo-controlled clinical pilot trial was designed to assess if preoperative oral thyroid hormone therapy could prevent the occurrence of euthyroid sick syndrome (ESS) and attenuate myocardial ischemia-reperfusion injury (IRI) after cardiac surgery with cardiopulmonary bypass (CPB) in children. METHODS Forty children aged 3 to 12 year, scheduled for elective congenital heart disease repair surgery with CPB, were randomized into 2 groups of equal size to receive the following treatments in a double-blind manner: placebo (control group) and thyroid tablet 0.4 mg/kg (trial group) taken orally once a day for 4 days before surgery. The perioperative serum thyroid hormone levels and hemodynamic variables were determined. The extubation time, duration of intensive care unit (ICU) stay, and use of inotropic drugs in the ICU were recorded. The myocardial expressions of heat shock protein 70 (HSP70), myosin heavy chain (MHC) mRNA, and thyroid hormone receptor (TR) mRNA were detected. The serum creatine kinase-MB (CK-MB) activity and troponin I (TnI) positive ratio at 24 hour after surgery were assessed. RESULTS There were no significant differences in hemodynamic variables at all observed points, extubation time, and duration of ICU stay between groups. As compared with baselines on administration, serum triiodothyronine (T3) and free T3 (FT3) levels on the first, second, and fourth postoperative day, and serum thyrotropic-stimulating hormone (TSH), tetraiodothyronine (T4), and free T4 (FT4) levels on the first postoperative day were significantly decreased in the 2 groups. Serum T3, FT3, and T4 levels on the first and second postoperative day, and serum FT4 level on the first postoperative day were significantly higher in the trial group than in control group. As compared with the control group, the number of patients requiring inotropic drugs in the ICU, serum CK-MB activity, serum positive TnI ratio, and myocardial expression of MHCβ mRNA were significantly decreased, and myocardial expressions of both HSP70 and MHCα mRNA were significantly increased in the trial group. CONCLUSIONS In children undergoing cardiac surgery with CPB, preoperative oral small-dose thyroid hormone therapy reduces severity of postoperative ESS and provides a protection against myocardial IRI by increasing HSP70 and MHCα expression.
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Affiliation(s)
- Jia-Qiang Zhang
- Department of Anesthesiology, Henan Provincial People's Hospital of Zhengzhou University, Zhengzhou
| | - Quan-Yong Yang
- Department of Anesthesiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College
| | - Fu-Shan Xue
- Department of Anesthesiology, Beijing Friendship Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Wei Zhang
- Department of Anesthesiology, Henan Provincial People's Hospital of Zhengzhou University, Zhengzhou
| | - Gui-Zhen Yang
- Department of Anesthesiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College
| | - Xu Liao
- Department of Anesthesiology, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College
| | - Fan-Min Meng
- Department of Anesthesiology, Henan Provincial People's Hospital of Zhengzhou University, Zhengzhou
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Penna C, Sorge M, Femminò S, Pagliaro P, Brancaccio M. Redox Aspects of Chaperones in Cardiac Function. Front Physiol 2018; 9:216. [PMID: 29615920 PMCID: PMC5864891 DOI: 10.3389/fphys.2018.00216] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 02/26/2018] [Indexed: 12/14/2022] Open
Abstract
Molecular chaperones are stress proteins that allow the correct folding or unfolding as well as the assembly or disassembly of macromolecular cellular components. Changes in expression and post-translational modifications of chaperones have been linked to a number of age- and stress-related diseases including cancer, neurodegeneration, and cardiovascular diseases. Redox sensible post-translational modifications, such as S-nitrosylation, glutathionylation and phosphorylation of chaperone proteins have been reported. Redox-dependent regulation of chaperones is likely to be a phenomenon involved in metabolic processes and may represent an adaptive response to several stress conditions, especially within mitochondria, where it impacts cellular bioenergetics. These post-translational modifications might underlie the mechanisms leading to cardioprotection by conditioning maneuvers as well as to ischemia/reperfusion injury. In this review, we discuss this topic and focus on two important aspects of redox-regulated chaperones, namely redox regulation of mitochondrial chaperone function and cardiac protection against ischemia/reperfusion injury.
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Affiliation(s)
- Claudia Penna
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Matteo Sorge
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
| | - Saveria Femminò
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Pasquale Pagliaro
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Mara Brancaccio
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Torino, Italy
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Quindry JC, Franklin BA. Cardioprotective Exercise and Pharmacologic Interventions as Complementary Antidotes to Cardiovascular Disease. Exerc Sport Sci Rev 2018; 46:5-17. [PMID: 28885265 DOI: 10.1249/jes.0000000000000134] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Exercise and pharmacologic therapies to prevent and treat cardiovascular disease have advanced largely through independent efforts. Understanding of first-line drug therapies, findings from preclinical animal studies, and the need for research initiatives related to complementary cardioprotective exercise-pharma interventions are reviewed from the premise that contemporary cardioprotective therapies must include adjunctive exercise and lifestyle interventions in addition to pharmacologic agents.
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Affiliation(s)
- John C Quindry
- Health and Human Performance, University of Montana, Missoula, MT
| | - Barry A Franklin
- Health and Human Performance, University of Montana, Missoula, MT
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Tanimoto T, Parseghian MH, Nakahara T, Kawai H, Narula N, Kim D, Nishimura R, Weisbart RH, Chan G, Richieri RA, Haider N, Chaudhry F, Reynolds GT, Billimek J, Blankenberg FG, Sengupta PP, Petrov AD, Akasaka T, Strauss HW, Narula J. Cardioprotective Effects of HSP72 Administration on Ischemia-Reperfusion Injury. J Am Coll Cardiol 2017; 70:1479-1492. [PMID: 28911512 DOI: 10.1016/j.jacc.2017.07.762] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 06/06/2017] [Accepted: 07/17/2017] [Indexed: 02/09/2023]
Abstract
BACKGROUND Although early reperfusion is the most desirable intervention after ischemic myocardial insult, it may add to damage through oxidative stress. OBJECTIVES This study investigated the cardioprotective effects of a single intravenous dose of heat shock protein-72 (HSP72) coupled to a single-chain variable fragment (Fv) of monoclonal antibody 3E10 (3E10Fv) in a rabbit ischemia-reperfusion model. The Fv facilitates rapid transport of HSP72 into cells, even with intact membranes. METHODS A left coronary artery occlusion (40 min) reperfusion (3 h) model was used in 31 rabbits. Of these, 12 rabbits received the fusion protein (Fv-HSP72) intravenously. The remaining 19 control rabbits received a molar equivalent of 3E10Fv alone (n = 6), HSP72 alone (n = 6), or phosphate-buffered saline (n = 7). Serial echocardiographic examinations were performed to assess left ventricular function before and after reperfusion. Micro-single-photon emission computed tomography imaging of 99mTc-labeled annexin-V was performed with micro-computed tomography scanning to characterize apoptotic damage in vivo, followed by gamma counting of the excised myocardial specimens to quantify cell death. Histopathological characterization of the myocardial tissue and sequential cardiac troponin I measurements were also undertaken. RESULTS Myocardial annexin-V uptake was 43% lower in the area at risk (p = 0.0003) in Fv-HSP72-treated rabbits compared with control animals receiving HSP72 or 3E10Fv alone. During reperfusion, troponin I release was 42% lower and the echocardiographic left ventricular ejection fraction 27% higher in the Fv-HSP72-treated group compared with control animals. Histopathological analyses confirmed penetration of 3E10Fv-containing molecules into cardiomyocytes in vivo, and treatment with Fv-HSP72 showed fewer apoptotic nuclei compared with control rabbits. CONCLUSIONS Single-dose administration of Fv-HSP72 fusion protein at the time of reperfusion reduced myocardial apoptosis by almost one-half and improved left ventricular functional recovery after myocardial ischemia-reperfusion injury in rabbits. It might have potential to serve as an adjunct to early reperfusion in the management of myocardial infarction.
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Affiliation(s)
- Takashi Tanimoto
- Icahn School of Medicine at Mount Sinai, New York, New York; Wakayama Medical University, Wakayama, Japan
| | | | | | - Hideki Kawai
- Icahn School of Medicine at Mount Sinai, New York, New York
| | | | - Dongbin Kim
- Icahn School of Medicine at Mount Sinai, New York, New York
| | - Robert Nishimura
- Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California; University of California Geffen School of Medicine, Los Angeles, California
| | - Richard H Weisbart
- Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California; University of California Geffen School of Medicine, Los Angeles, California
| | - Grace Chan
- Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California
| | | | - Nezam Haider
- Icahn School of Medicine at Mount Sinai, New York, New York
| | | | | | - John Billimek
- University of California, Irvine, Irvine, California
| | | | | | | | | | | | - Jagat Narula
- Icahn School of Medicine at Mount Sinai, New York, New York.
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Parseghian MH, Hobson ST, Richieri RA. Targeted heat shock protein 72 for pulmonary cytoprotection. Ann N Y Acad Sci 2016; 1374:78-85. [PMID: 27152638 DOI: 10.1111/nyas.13059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 02/29/2016] [Accepted: 03/09/2016] [Indexed: 12/12/2022]
Abstract
Heat shock protein 72 (HSP72) is perhaps the most important member of the HSP70 family of proteins, given that it is induced in a wide variety of tissues and cells to combat stress, particularly oxidative stress. Here, we review independent observations of the critical role this protein plays as a pulmonary cytoprotectant and discuss the merits of developing HSP72 as a therapeutic for rapid delivery to cells and tissues after a traumatic event. We also discuss the fusion of HSP72 to a cell-penetrating single-chain Fv antibody fragment derived from mAb 3E10, referred to as Fv-HSP70. This fusion construct has been validated in vivo in a cerebral infarction model and is currently in testing as a clinical therapeutic to treat ischemic events and as a fieldable medical countermeasure to treat inhalation of toxicants caused by terrorist actions or industrial accidents.
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Affiliation(s)
| | - Stephen T Hobson
- Rubicon Biotechnology, Lake Forest, California.,Seacoast Science, Inc, Carlsbad, California
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Kesaraju S, Nayak G, Prentice HM, Milton SL. Upregulation of Hsp72 mediates anoxia/reoxygenation neuroprotection in the freshwater turtle via modulation of ROS. Brain Res 2014; 1582:247-56. [PMID: 25107858 DOI: 10.1016/j.brainres.2014.07.044] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 06/23/2014] [Accepted: 07/29/2014] [Indexed: 10/25/2022]
Abstract
The neuroprotective role of Hsp72 has been demonstrated in several ischemic/stroke models to occur primarily through mediation of apoptotic pathways, and a number of heat shock proteins are upregulated in animal models capable of extended anoxic survival. In the present study, we investigated the role of Hsp72 on cell death and apoptotic regulators in one anoxia tolerant model system, the freshwater turtle Trachemys scripta. Since Hsp72 is known to regulate apoptosis through interactions with Bcl-2, we manipulated the levels of Hsp72 and Bcl-2 with siRNA in neuronally enriched primary cell cultures and examined downstream effects. The knockdown of either Hsp72 or Bcl-2 induced cell death during anoxia and reoxygenation. Knockdown of Bcl-2 resulted in increases in apoptotic markers and increased ROS levels 2-fold. However, significant knockdown of Hsp72 did not have any effect on the expression of key mitochondrial apoptotic regulators such as Cytochrome c and caspase-3. Hsp72 knockdown however significantly increased apoptosis inducing factor in both anoxia and reoxygenation and resulted in a six-fold induction of hydrogen peroxide levels. These findings suggest that the neuroprotection offered by Hsp72 in the anoxia/reoxygenation tolerant turtle is through the mediation of ROS levels and not through modulation of caspase-dependent pathways.
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Affiliation(s)
- Shailaja Kesaraju
- Department of Biological Sciences, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, United States; Center for Molecular Biology and Biotechnology, Florida Atlantic University, United States(1)
| | - Gauri Nayak
- College of Medicine, Florida Atlantic University, United States; Boston University, United States(2)
| | | | - Sarah L Milton
- Department of Biological Sciences, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, United States.
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Uryash A, Wu H, Bassuk J, Kurlansky P, Adams JA. Preconditioning with periodic acceleration (pGz) provides second window of cardioprotection. Life Sci 2012; 91:178-85. [DOI: 10.1016/j.lfs.2012.06.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Revised: 05/30/2012] [Accepted: 06/27/2012] [Indexed: 11/27/2022]
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Søndergaard L, Dagnæs-Hansen F, Herskin M. Welfare assessment in porcine biomedical research – Suggestion for an operational tool. Res Vet Sci 2011; 91:e1-9. [DOI: 10.1016/j.rvsc.2011.02.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Revised: 01/19/2011] [Accepted: 02/22/2011] [Indexed: 01/08/2023]
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Murphy T, Walsh PM, Doran PP, Mulhall KJ. Transcriptional responses in the adaptation to ischaemia-reperfusion injury: a study of the effect of ischaemic preconditioning in total knee arthroplasty patients. J Transl Med 2010; 8:46. [PMID: 20459731 PMCID: PMC2876069 DOI: 10.1186/1479-5876-8-46] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Accepted: 05/10/2010] [Indexed: 01/03/2023] Open
Abstract
Background Ischaemic preconditioning (IPC) has emerged as a method of reducing ischaemia-reperfusion injury. However, the complex mechanism through which IPC elicits this protection is not fully understood. The aim of this study was to investigate the genomic response induced by IPC in muscle biopsies taken from the operative leg of total knee arthroplasty patients in order to gain insight into the IPC mechanism. Methods Twenty patients, undergoing primary total knee arthroplasty, were randomly assigned to IPC (n = 10) and control (n = 10) groups. Patients in the IPC group received ischaemic preconditioning immediately prior to surgery. IPC was induced by three five-minute cycles of tourniquet insufflation interrupted by five-minute cycles of reperfusion. A muscle biopsy was taken from the operative knee of control and IPC-treated patients at the onset of surgery and, again, at one hour into surgery. The gene expression profile of muscle biopsies was determined using the Affymetrix Human U113 2.0 microarray system and validated using real-time polymerase chain reaction (RT-PCR). Measurements of C-reactive protein (CRP), erythrocyte sedimentation (ESR), white cell count (WCC), cytokines and haemoglobin were also made pre- and post-operatively. Results Microarray analysis revealed a significant increase in the expression of important oxidative stress defence genes, immediate early response genes and mitochondrial genes. Upregulation of pro-survival genes was also observed and correlated with a downregulation of pro-apoptotic gene expression. CRP, ESR, WCC, cytokine and haemoglobin levels were not significantly different between control and IPC patients. Conclusions The findings of this study suggest that IPC of the lower limb in total knee arthroplasty patients induces a protective genomic response, which results in increased expression of immediate early response genes, oxidative stress defence genes and pro-survival genes. These findings indicate that ischaemic preconditioning may be of potential benefit in knee arthroplasty and other musculoskeletal conditions.
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Affiliation(s)
- Terence Murphy
- UCD Clinical Research Centre, UCD School of Medicine and Medical Sciences, Mater University Hospital, Dublin, Ireland
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Hagiwara S, Iwasaka H, Shingu C, Noguchi T. Comparison of effects of total enteral versus total parenteral nutrition on ischemia/reperfusion-induced heart injury in rats. Eur Surg Res 2008; 40:361-7. [PMID: 18319602 DOI: 10.1159/000119414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2007] [Accepted: 12/03/2007] [Indexed: 11/19/2022]
Abstract
BACKGROUND The long-term effect of nutrition on cardiac function remains to be elucidated. One possible link is the newly discovered gastric hormone ghrelin, which has been reported to be cardioprotective. AIM The present study examined whether total enteral nutrition (TEN) and total parenteral nutrition (TPN) differ in their modulation of ghrelin production and their effects on cardiac function after ischemia/reperfusion injury. METHODS Rats received isocaloric parenteral or enteral nutrition through implanted vascular catheters or gastrostomy tubes. TEN was administered in a conventional (TEN-C) or immunonutrition (TEN-I) form. After 7 days, serum ghrelin levels were determined by enzyme-linked immunosorbent assays and myocardial function was assessed using the Langendorff isolated heart technique. RESULTS TEN-I animals had significantly higher plasma ghrelin levels than the other groups. After ischemia/reperfusion injury, left ventricular developed pressure decreased in animals receiving TPN when compared to animals receiving TEN-I. Animals receiving TPN also had significant reductions in their maximal rates of increase and decrease in left ventricular pressure when compared to animals receiving TEN-I (unpaired t test, p < 0.05). CONCLUSION TEN-I increases serum levels of ghrelin, which protects cardiac function after ischemic/reperfusion injury. Because TEN-I more effectively protects cardiac function, we recommend it for long-term nutritional support.
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Affiliation(s)
- S Hagiwara
- Anesthesiology, Department of Brain and Nerve Science, Oita University Faculty of Medicine, Oita, Japan.
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Quindry JC, Hamilton KL, French JP, Lee Y, Murlasits Z, Tumer N, Powers SK. Exercise-induced HSP-72 elevation and cardioprotection against infarct and apoptosis. J Appl Physiol (1985) 2007; 103:1056-62. [PMID: 17569768 DOI: 10.1152/japplphysiol.00263.2007] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Successive bouts of endurance exercise are associated with both increased cardiac levels of heat shock protein-72 (HSP-72) and improved cardioprotection against ischemia-reperfusion (I/R)-induced cardiac cell death. Although overexpression of HSP-72 has been shown to be cardioprotective in transgenic animals, it is unclear whether increased levels of HSP-72 are essential for exercise-induced cardioprotection against I/R-mediated cell death. We tested the hypothesis that exercise-induced increases in myocardial levels of HSP-72 are required to achieve exercise-mediated protection against I/R-induced cardiac cell death. To test this postulate, we investigated the effect of preventing the exercise-induced increase in cardiac HSP-72 on myocardial infarction and apoptosis after 50 min of in vivo ischemia and 120 min of reperfusion. Adult male rats remained sedentary or performed successive bouts of endurance exercise in cold (8°C) or warm (22°C) environments. We found that, compared with sedentary control animals, exercise in a warm environment significantly increased myocardial HSP-72 content. In contrast, exercise in the cold environment prevented the exercise-induced increase in myocardial HSP-72 levels. After in vivo myocardial I/R, infarct size was reduced in both exercised groups compared with sedentary animals. Furthermore, compared with sedentary rats, I/R-induced myocardial apoptosis (as indicated by terminal deoxynucleotidyl transferase dUTP-mediated nick-end labeling-positive nuclei and caspase-3 activity) was attenuated in both groups of exercised animals. Therefore, although HSP-72 has cardioprotective properties, our results reveal that increased myocardial levels of HSP-72 (above control) are not essential for exercise-induced protection against I/R-induced myocardial infarction and apoptosis.
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Affiliation(s)
- John C Quindry
- Department of Applied Physiology and Kinesiology, Center for Exercise Science, University of Florida, Gainesville, Florida, USA.
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Pantos C, Mourouzis I, Dimopoulos A, Markakis K, Panagiotou M, Xinaris C, Tzeis S, Kokkinos AD, Cokkinos DV. Enhanced tolerance of the rat myocardium to ischemia and reperfusion injury early after acute myocardial infarction. Basic Res Cardiol 2007; 102:327-33. [PMID: 17285351 DOI: 10.1007/s00395-007-0645-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2006] [Revised: 01/16/2007] [Accepted: 01/17/2007] [Indexed: 11/25/2022]
Abstract
It is now recognized that changes occurring during cardiac remodeling may influence the tolerance of the myocardium to ischemic stress. Therefore, the present study investigated the response of the post-infarcted heart to ischemia in an experimental model of ischemia and reperfusion injury and the possible underlying mechanisms. Acute myocardial infarction (AMI) was induced in Wistar male rats by ligating the left coronary artery (AMI, n = 13), while sham-operated rats were used as controls (SHAM, n = 11). At 2 weeks, cardiac dysfunction was observed in AMI, as indicated by the reduction of the left ventricular EF%. Isolated hearts were then subjected to 30 min of zero-flow global ischemia followed by 45 min of reperfusion. Ischemic contracture was significantly depressed in AMI hearts. Postischemic left ventricular end diastolic pressure (LVEDP45) in mmHg and LDH release in IU/g were markedly decreased; LVEDP45 was 52.1 (7.5) for AMI vs 96.6 (7.5),P < 0.05 and LDH release was 7.5 (1.0) in AMI vs 11.4 (0.56) in SHAM, P < 0.05. This response was associated with 2-fold increase in HSP70 expression in AMI hearts (noninfarcted segment), P < 0.05 vs SHAM and 1.7 fold increase in the expression of the phospho-HSP27, P < 0.05, while the expression of PKCepsilon was shown to be 1.4-fold less in AMI, P < 0.05. In conclusion, the post-infarcted heart seems to be resistant to ischemiareperfusion injury and heat shock protein 70 and 27 may be involved in this response.
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Affiliation(s)
- Constantinos Pantos
- Dept. of Pharmacology, University of Athens, 75 Mikras Asias Ave., 11527 Goudi, Athens, Greece.
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