1
|
Czimmerer Z, Halasz L, Daniel B, Varga Z, Bene K, Domokos A, Hoeksema M, Shen Z, Berger WK, Cseh T, Jambrovics K, Kolostyak Z, Fenyvesi F, Varadi J, Poliska S, Hajas G, Szatmari I, Glass CK, Bacsi A, Nagy L. The epigenetic state of IL-4-polarized macrophages enables inflammatory cistromic expansion and extended synergistic response to TLR ligands. Immunity 2022; 55:2006-2026.e6. [PMID: 36323312 PMCID: PMC9649892 DOI: 10.1016/j.immuni.2022.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 07/11/2022] [Accepted: 10/06/2022] [Indexed: 11/05/2022]
Abstract
Prior exposure to microenvironmental signals could fundamentally change the response of macrophages to subsequent stimuli. It is believed that T helper-2 (Th2)-cell-type cytokine interleukin-4 (IL-4) and Toll-like receptor (TLR) ligand-activated transcriptional programs mutually antagonize each other, and no remarkable convergence has been identified between them. In contrast, here, we show that IL-4-polarized macrophages established a hyperinflammatory gene expression program upon lipopolysaccharide (LPS) exposure. This phenomenon, which we termed extended synergy, was supported by IL-4-directed epigenomic remodeling, LPS-activated NF-κB-p65 cistrome expansion, and increased enhancer activity. The EGR2 transcription factor contributed to the extended synergy in a macrophage-subtype-specific manner. Consequently, the previously alternatively polarized macrophages produced increased amounts of immune-modulatory factors both in vitro and in vivo in a murine Th2 cell-type airway inflammation model upon LPS exposure. Our findings establish that IL-4-induced epigenetic reprogramming is responsible for the development of inflammatory hyperresponsiveness to TLR activation and contributes to lung pathologies.
Collapse
Affiliation(s)
- Zsolt Czimmerer
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary,Institute of Genetics, Biological Research Centre, Eötvös Loránd Research Network, Szeged, Hungary,These authors contributed equally
| | - Laszlo Halasz
- Departments of Medicine and Biological Chemistry, Johns Hopkins University School of Medicine, Institute for Fundamental Biomedical Research, Johns Hopkins All Children’s Hospital, St. Petersburg, FL, USA,Present address: Stanford University School of Medicine, Department of Pathology, Stanford, CA, USA
| | - Bence Daniel
- Departments of Medicine and Biological Chemistry, Johns Hopkins University School of Medicine, Institute for Fundamental Biomedical Research, Johns Hopkins All Children’s Hospital, St. Petersburg, FL, USA,These authors contributed equally,Present address: Stanford University School of Medicine, Department of Pathology, Stanford, CA, USA
| | - Zsofia Varga
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Krisztian Bene
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Apolka Domokos
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary,Molecular Cell and Immunobiology Doctoral School, Faculty of Medicine, University of Debrecen 4032, Debrecen, Hungary
| | - Marten Hoeksema
- Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Zeyang Shen
- Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA,Department of Bioengineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, CA, USA
| | - Wilhelm K. Berger
- Departments of Medicine and Biological Chemistry, Johns Hopkins University School of Medicine, Institute for Fundamental Biomedical Research, Johns Hopkins All Children’s Hospital, St. Petersburg, FL, USA
| | - Timea Cseh
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Karoly Jambrovics
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Zsuzsanna Kolostyak
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary,Molecular Cell and Immunobiology Doctoral School, Faculty of Medicine, University of Debrecen 4032, Debrecen, Hungary
| | - Ferenc Fenyvesi
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Debrecen, Hungary
| | - Judit Varadi
- Department of Pharmaceutical Technology, Faculty of Pharmacy, University of Debrecen, Debrecen, Hungary
| | - Szilard Poliska
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gyorgy Hajas
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary,ELKH-DE Allergology Research Group, Debrecen, Hungary
| | - Istvan Szatmari
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Christopher K. Glass
- Department of Cellular and Molecular Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA,Department of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA, USA
| | - Attila Bacsi
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary,ELKH-DE Allergology Research Group, Debrecen, Hungary
| | - Laszlo Nagy
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary,Departments of Medicine and Biological Chemistry, Johns Hopkins University School of Medicine, Institute for Fundamental Biomedical Research, Johns Hopkins All Children’s Hospital, St. Petersburg, FL, USA,Lead contact,Correspondence:
| |
Collapse
|
2
|
Sarvary E, Lee D, Varadi J, Varga M, Gaal I, Chmel R, Beko G, Kanyo Z, Nemes B, Gerlei Z, Fazakas J, Kobori L, Herold Z, Németh S, Galoczi I, Jaray J, Langer R. The iQ200 Microscopic Analyzer is valuable tool for evaluation of urinary sediment at transplanted patients. Interv Med Appl Sci 2010. [DOI: 10.1556/imas.2.2010.1.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Abstract
The value of urinary cytology in the diagnosis of different pathological conditions in renal transplantation is particularly important. Manual microscopic urinalysis is a high-volume procedure that currently requires significant labour.
Objective: To automate the sediment evaluation and to make this more accurate using the Iris Diagnostics Automated Urine Microscopy Analyzer (iQ200). Our goal was to compare the manual and automated microscopic data to apply iQ200 in renal function monitoring.
Method: The iQ200 uses digital imaging and Auto Analyte Recognition software to classify urine constituents into 12 analyte categories and quantitatively report.
Results: We determined cut-off values of urine particles in every category, which correlated well with manual microscopic results. The iQ200 was more sensitive for pathological casts than manual microscopic analysis. iQ200 helped the operator to differentiate between isomorphic and dismorphic erythrocytes and between lymphocytes and granulocytes, too. Every pathological constituent could be recognized, which is very important for early recognition of renal impairment, graft rejection and urinary tract infection.
Conclusions: The iQ200 system automatically classifies 12 particles, significantly reducing the need for additional sample preparation, manual microscopic review achieving a high degree of standardization in urinalysis.
Collapse
Affiliation(s)
- Eniko Sarvary
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
- 4 Transplantation and Surgical Clinic, Semmelweis University, Baross u. 23–25, H-1082, Budapest, Hungary
| | - D. Lee
- 2 Diagnosticum Zrt, Budapest, Hungary
| | - J. Varadi
- 2 Diagnosticum Zrt, Budapest, Hungary
| | - M. Varga
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | - I. Gaal
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | - R. Chmel
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | - G. Beko
- 3 I. Department of Medicine, Semmelweis University, Budapest, Hungary
| | - Z. Kanyo
- 2 Diagnosticum Zrt, Budapest, Hungary
| | - B. Nemes
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | - Zs. Gerlei
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | | | - L. Kobori
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | - Zs. Herold
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | - S. Németh
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | | | - J. Jaray
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| | - R. Langer
- 1 Transplantation and Surgical Clinic, Semmelweis University, Budapest, Hungary
| |
Collapse
|
3
|
Das S, Lekli I, Das M, Szabo G, Varadi J, Juhasz B, Bak I, Nesaretam K, Tosaki A, Powell SR, Das DK. Cardioprotection with palm oil tocotrienols: comparision of different isomers. Am J Physiol Heart Circ Physiol 2007; 294:H970-8. [PMID: 18083895 DOI: 10.1152/ajpheart.01200.2007] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A recent study from our laboratory indicated the cardioprotective ability of the tocotrienol-rich fraction (TRF) from red palm oil. The present study compared cardioprotective abilities of different isomers of tocotrienol against TRF as recently tocotrienol has been found to function as a potent neuroprotective agent against stroke. Rats were randomly assigned to one of the following groups: animals were given, by gavage, either 0.35%, 1%, or 3.5% TRF for two different periods of time (2 or 4 wk) or 0.03, 0.3, and 3 mg/kg body wt of one of the isomers of tocotrienol (alpha, gamma, or delta) for 4 wk; control animals were given, by gavage, vehicle only. After 2 or 4 wk, rats were killed, and their hearts were then subjected to 30 min of global ischemia followed by 2 h of reperfusion. Dose-response and time-response experiments revealed that the optimal concentration for TRF was 3.5% TRF and 0.3 mg/kg body wt of tocotrienol given for 4 wk. TRF as well as all the isomers of tocotrienol used in our study provided cardioprotection, as evidenced by their ability to improve postischemic ventricular function and reduce myocardial infarct size. The gamma-isoform of tocotrienol was the most cardioprotective of all the isomers followed by the alpha- and delta-isoforms. The molecular mechanisms of cardioprotection afforded by tocotrienol isoforms were probed by evaluating their respective abilities to stabilize the proteasome, allowing it to maintain a balance between prodeath and prosurvival signals. Our results demonstrated that tocotrienol isoforms reduced c-Src but increased the phosphorylation of Akt, thus generating a survival signal.
Collapse
Affiliation(s)
- Samarjit Das
- Cardiovascular Research Center, University of Connecticut School of Medicine, Farmington, CT 06030-1110, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Lekli I, Szabo G, Juhasz B, Das S, Das M, Varga E, Szendrei L, Gesztelyi R, Varadi J, Bak I, Das DK, Tosaki A. Protective mechanisms of resveratrol against ischemia-reperfusion-induced damage in hearts obtained from Zucker obese rats: the role of GLUT-4 and endothelin. Am J Physiol Heart Circ Physiol 2007; 294:H859-66. [PMID: 18065527 DOI: 10.1152/ajpheart.01048.2007] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The resveratrol-induced cardiac protection was studied in Zucker obese rats. Rats were divided into five groups: group 1, lean control; group 2, obese control (OC); group 3, obese rats treated orally with 5 mg kg(-1) day(-1) of resveratrol (OR) for 2 wk; group 4, obese rats received 10% glucose solution ad libitum for 3 wk (OG); and group 5, obese rats received 10% glucose for 3 wk and resveratrol (OGR) during the 2nd and 3rd wk. Body weight, serum glucose, and insulin were measured, and then hearts were isolated and subjected to 30 min of ischemia followed by 120 min of reperfusion. Heart rate, coronary flow, aortic flow, developed pressure, the incidence of reperfusion-induced ventricular fibrillation, and infarct size were measured. Resveratrol reduced body weight and serum glucose in the OR compared with the OC values (414 +/- 10 g and 7.08 +/- 0.41 mmol/l, respectively, to 378 +/- 12 g and 6.11 +/- 0.44 mmol/l), but insulin levels were unchanged. The same results were obtained for the OG vs. OGR group. Resveratrol improved postischemic cardiac function in the presence or absence of glucose intake compared with the resveratrol-free group. The incidence of ventricular fibrillation and infarct size was reduced by 83 and 20% in the OR group, and 67 and 16% in the OGR group, compared with the OC and OG groups, respectively. Resveratrol increased GLUT-4 expression and reduced endothelin expression and cardiac apoptosis in ischemic-reperfused hearts in the presence or absence of glucose intake. Thus the protective effect of resveratrol could be related to its direct effects on the heart.
Collapse
Affiliation(s)
- Istvan Lekli
- Department of Pharmacology, Faculty of Pharmacy, Health Science Center, University of Debrecen, Debrecen, Hungary
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Kiss T, Fenyvesi F, Pasztor N, Feher P, Varadi J, Kocsan R, Szente L, Fenyvesi E, Szabo G, Vecsernyes M, Bacskay I. Cytotoxicity of different types of methylated beta-cyclodextrins and ionic derivatives. Pharmazie 2007; 62:557-8. [PMID: 17718201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Cyclodextrins (CDs) are widely used materials and still in the focus of drug development. In spite of the extensive studies, there is limited information about the cytotoxic effect of different derivatives. This study compares the cytotoxic effect of methylated beta-CDs and some ionic derivatives. The methylated CDs involved in this study differ in the number and position of the methyl substituents. Heptakis(2,6-di-O-methyl)-beta-CD (DIMEB) with a degree of substitution (DS) of 14 has two methyl groups in all of the seven glucose subunits mostly at O-2 and O-6 position, each OH group is methylated in heptakis(2,3,6-tri-O-methyl)-beta-CD (TRIMEB) (DS = 21), and an unsystematic substitution is realized in randomly methylated beta-CD (RAMEB). DS is defined as the number of substituents per cyclodextrin ring. Using the above definition, the DS for RAMEB is 12.6. To see the effect of the ionic groups an anionic and a cationic CD derivative were also investigated: (2-hydroxy-3-N,N,N-trimethylamino)propyl beta-CD (QABCD) (DS = 2) and carboxymethylated beta-CD (CMBCD) (DS = 3,5). The in vitro cell toxicity decreases in the order of DIMEB > TRIMEB > or = RAMEB > QABCD > CMBCD. Ionic beta-CDs were less toxic than the methylated derivatives.
Collapse
Affiliation(s)
- T Kiss
- Department of Pharmaceutical Technology, Medical and Health Science Center, University of Debrecen, Hungary
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Varadi J, Lekli I, Juhasz B, Bacskay I, Szabo G, Gesztelyi R, Szendrei L, Varga E, Bak I, Foresti R, Motterlini R, Tosaki A. Beneficial effects of carbon monoxide-releasing molecules on post-ischemic myocardial recovery. Life Sci 2007; 80:1619-26. [PMID: 17321552 DOI: 10.1016/j.lfs.2007.01.047] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2006] [Revised: 12/20/2006] [Accepted: 01/20/2007] [Indexed: 01/22/2023]
Abstract
There is increasing evidence corroborating a protective role of carbon monoxide releasing molecules (CORMs) in injured tissues. Carbon monoxide (CO) carriers have been recently developed as a pharmacological tool to simulate the effect of heme oxygenase-1-derived CO. The effects of CORM-3, a water-soluble CO releaser, on the incidence of reperfusion-induced ventricular fibrillation (VF) and tachycardia (VT) were studied in isolated rat hearts. Hearts were treated with different doses of CORM-3 before the induction of 30 min global ischemia followed by 120 min reperfusion. We found that at concentrations of 25 microM and 50 microM of CORM-3 promoted a significant reduction in the incidence of VF and VT. Thus, the incidence of VF was reduced by 67% (p<0.05) and 92% (p<0.05) with 25 microM and 50 microM of CORM-3, respectively. The protective effect of CORM-3 on the incidence of VT followed the same pattern. The antiarrhythmic protection was associated with a marked attenuation in infarct size, significant decreases in cellular Na(+) and Ca(2+) gains and K(+) loss. Consequently, the recovery of post-ischemic function was significantly improved. In conclusion, CORM-3 exerts beneficial effects against ischemia/reperfusion-induced injury through its abilities to release CO which mediates a cardioprotective action by regulating tissue Na(+), K(+), and Ca(2+) levels.
Collapse
Affiliation(s)
- Judit Varadi
- Department of Pharmacology, Health Science Center, Faculty of Pharmacy, University of Debrecen, Debrecen, Hungary
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Affiliation(s)
- Samarjit Das
- Cardiovascular Research CenterUniversity of Connecticut School of Medicine263 Farmington AvenueFarmingtonCT06030‐1110
| | - Arpad Tosaki
- Pharmacy SciencesUniversity of Debrecen, DebrecenDebrecenHungary
| | - Bela Juhasz
- Pharmacy SciencesUniversity of Debrecen, DebrecenDebrecenHungary
| | - Istvan Lekli
- Pharmacy SciencesUniversity of Debrecen, DebrecenDebrecenHungary
| | - Judit Varadi
- Pharmacy SciencesUniversity of Debrecen, DebrecenDebrecenHungary
| | | | - Nilanjana Maulik
- Cardiovascular Research CenterUniversity of Connecticut School of Medicine263 Farmington AvenueFarmingtonCT06030‐1110
| | - Dipak K Das
- Cardiovascular Research CenterUniversity of Connecticut School of Medicine263 Farmington AvenueFarmingtonCT06030‐1110
| |
Collapse
|
8
|
Bak I, Lekli I, Juhasz B, Nagy N, Varga E, Varadi J, Gesztelyi R, Szabo G, Szendrei L, Bacskay I, Vecsernyes M, Antal M, Fesus L, Boucher F, de Leiris J, Tosaki A. Cardioprotective mechanisms ofPrunus cerasus(sour cherry) seed extract against ischemia-reperfusion-induced damage in isolated rat hearts. Am J Physiol Heart Circ Physiol 2006; 291:H1329-36. [PMID: 16617126 DOI: 10.1152/ajpheart.01243.2005] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The effects of kernel extract obtained from sour cherry ( Prunus cerasus) seed on the postischemic cardiac recovery were studied in isolated working rat hearts. Rats were treated with various daily doses of the extract for 14 days, and hearts were then isolated and subjected to 30 min of global ischemia followed by 120 min of reperfusion. The incidence of ventricular fibrillation (VF) and tachycardia (VT) fell from their control values of 92% and 100% to 50% (not significant) and 58% (not significant), 17% ( P < 0.05), and 25% ( P < 0.05) with the doses of 10 mg/kg and 30 mg/kg of the extract, respectively. Lower concentrations of the extract (1 and 5 mg/kg) failed to significantly reduce the incidence of VF and VT during reperfusion. Sour cherry seed kernel extract (10 and 30 mg/kg) significantly improved the postischemic recovery of cardiac function (coronary flow, aortic flow, and left ventricular developed pressure) during reperfusion. We have also demonstrated that the extract-induced protection in cardiac function significantly reflected in a reduction of infarct size. Immunohistochemistry indicates that a reduction in caspase-3 activity and apoptotic cells by the extract, beside other potential action mechanisms of proanthocyanidin, trans-resveratrol, and flavonoid components of the extract, could be responsible for the cardioprotection in ischemic-reperfused myocardium.
Collapse
Affiliation(s)
- Istvan Bak
- Department of Pharmacology, Faculty of Pharmacy, Health and Science Center, University of Debrecen, Nagyerdei krt. 98, 4032-Debrecen, Hungary
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Szilagyi A, Fenyvesi F, Majercsik O, Pelyvas IF, Bacskay I, Fehér P, Varadi J, Vecsernyés M, Herczegh P. Synthesis and Cytotoxicity of Leinamycin Antibiotic Analogues. J Med Chem 2006; 49:5626-30. [PMID: 16942037 DOI: 10.1021/jm060471h] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple synthesis of 1,2-dithiolan-3-ones from alpha,beta-unsaturated thiophenyl esters is reported. Introduction of the biologically active 1,2-dithiolan-3-one-1-oxide moiety of leinamycin into aldehydo-d-arabinose 11, the uridine derivative 16, and the deoxythymidine 21 was established. An extended bioactive part of leinamycin carrying a carbon-carbon triple bond was also synthesized. All of these analogues of leinamycin showed cytotoxic activity against HeLa3 tumor cells. Interestingly, the lipophilic, silyl group-containing derivatives proved to be more active than the hydrophilic counterparts.
Collapse
Affiliation(s)
- Akos Szilagyi
- Department of Pharmaceutical Chemistry and Research Group for Antibiotics of the Hungarian Academy of Sciences, University of Debrecen, Egyetem tér 1, P.O. Box 70 H-4010 Debrecen, Hungary
| | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Bak I, Varadi J, Nagy N, Vecsernyes M, Tosaki A. The role of exogenous carbon monoxide in the recovery of post-ischemic cardiac function in buffer perfused isolated rat hearts. Cell Mol Biol (Noisy-le-grand) 2005; 51:453-9. [PMID: 16309567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2005] [Accepted: 02/17/2005] [Indexed: 05/05/2023]
Abstract
Isolated rat hearts were perfused for 10 min with oxygenated buffer and equilibrated with carbon monoxide (CO) of 0.001% and 0.01% before the induction of 30 min global ischemia followed by 120 min of reperfusion. These concentrations of CO significantly improved the post-ischemic recovery of coronary flow (CF), aortic flow (AF), and left ventricular developed pressure (LVDP). The improvement in recovery reflected in the reduction of infarct size and the incidence of reperfusion-induced ventricular fibrillation (VF). Thus, hearts subjected to 0.001% and 0.01% of CO exposure via the perfusion buffer, infarct size was reduced from the CO-free control value of 39% +/- 5% to 21% +/- 3% (*p<0.05) and 18% +/- 4% (*p<0.05), respectively. In the presence of 0.001% and 0.01% CO, the incidence of VF was also reduced from its control value of 92% to 17% (*p<0.05) and 17% (*p<0.05), respectively. Increasing the CO exposure to 0.1% in the buffer, all hearts showed VF combined with ventricular tachycardia or bradycardia and various rhythm disturbances indicating the direct toxic effects of CO on the myocardium. The results show that cardioprotective concentrations (0.01% and 0.001%) of exogenous CO related to an increase in cGMP levels and guanylate cyclase activities.
Collapse
Affiliation(s)
- I Bak
- Department of Pharmacology, Health Science Center, University of Debrecen, Nagyerdei krt. 98, 4032-Debrecen, Hungary
| | | | | | | | | |
Collapse
|