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Kim MN, Kim SR, Kim HD, Cho DH, Jung SP, Park KH, Park SM. Serial changes of layer-specific myocardial function according to chemotherapy regimen in patients with breast cancer. EUROPEAN HEART JOURNAL OPEN 2022; 2:oeac008. [PMID: 36117949 PMCID: PMC9472785 DOI: 10.1093/ehjopen/oeac008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 02/17/2022] [Indexed: 12/29/2022]
Abstract
Aims Chemotherapy-induced cardiotoxicity (CIC) is a significant complication, meanwhile myocardial damage might differ depending on chemotherapy agents and their timing. The aim of this study was to evaluate serial changes of layer-specific myocardial function in patients with breast cancer and their differences by the development time of CIC and chemotherapy agent. Methods and results A total of 105 consecutive patients with breast cancer (age: 52.3 ± 9.3 years) were enrolled. Chemotherapy-induced cardiotoxicity occurred in 20 (19%) patients during 6 months. Endocardial and midmyocardial functions decreased in patients with or without CIC, with patients with CIC showing greater decreases during follow-up. Global longitudinal strain (GLS) change at 3 months was the most sensitive parameter to detect CIC. When new development of CIC was analysed at 6 months, GLS was reduced earlier than the decrease of left ventricular ejection fraction. In patients with CIC who were treated with anthracycline-based regimen for 3 months, endocardial GLS markedly decreased at 3 months and continued to decrease until 6 months. Patients with CIC who received trastuzumab therapy after anthracycline therapy showed further reduction in endocardial GLS at the 6-month follow-up, which was not shown in patients with CIC who received taxane therapy subsequently. Conclusion Myocardial function assessed by strain decreased in all patients with breast cancer receiving chemotherapy. The endocardial layer was the most vulnerable to chemotherapy-induced myocardial damage. Functional impairment was more profound in patients with CIC who received sequential anthracycline-trastuzumab chemotherapy. Thus, early evaluation of left ventricular function might be necessary for all patients with breast cancer to detect CIC.
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Affiliation(s)
- Mi-Na Kim
- Division of Cardiology, Department of internal medicie, Korea University Medicine, Anam Hospital, Goryoedae-ro 73, Seongbukgu, Seoul 02841, Korea
| | - So-Ree Kim
- Division of Cardiology, Department of internal medicie, Korea University Medicine, Anam Hospital, Goryoedae-ro 73, Seongbukgu, Seoul 02841, Korea
| | - Hee-Dong Kim
- Division of Cardiology, Department of internal medicie, Soonchunhyang University Hospital, Cheonan, Korea
| | - Dong-Hyuk Cho
- Division of Cardiology, Department of internal medicie, Wonju Severance Christian Hospital, Wonju, Korea
| | - Seung Pil Jung
- Division of Breast and Endocrine Surgery, Department of General Surgery, Korea University Medical Center, Anam Hospital, Seoul, Korea
| | - Kyong Hwa Park
- Division of Oncology, Department of internal medicine, Korea University Medical Center, Anam Hospital, Seoul, Korea
| | - Seong-Mi Park
- Division of Cardiology, Department of internal medicie, Korea University Medicine, Anam Hospital, Goryoedae-ro 73, Seongbukgu, Seoul 02841, Korea
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Single cardiomyocytes from papillary muscles show lower preload-dependent activation of force compared to cardiomyocytes from the left ventricular free wall. J Mol Cell Cardiol 2022; 166:127-136. [DOI: 10.1016/j.yjmcc.2022.02.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 02/05/2022] [Accepted: 02/22/2022] [Indexed: 01/21/2023]
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Wacker C, Dams N, Schauer A, Ritzer A, Volk T, Wagner M. Region-specific mechanisms of corticosteroid-mediated inotropy in rat cardiomyocytes. Sci Rep 2020; 10:11604. [PMID: 32665640 PMCID: PMC7360564 DOI: 10.1038/s41598-020-68308-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 06/23/2020] [Indexed: 11/09/2022] Open
Abstract
Regional differences in ion channel activity in the heart control the sequence of repolarization and may contribute to differences in contraction. Corticosteroids such as aldosterone or corticosterone increase the L-type Ca2+ current (ICaL) in the heart via the mineralocorticoid receptor (MR). Here, we investigate the differential impact of corticosteroid-mediated increase in ICaL on action potentials (AP), ion currents, intracellular Ca2+ handling and contractility in endo- and epicardial myocytes of the rat left ventricle. Dexamethasone led to a similar increase in ICaL in endocardial and epicardial myocytes, while the K+ currents Ito and IK were unaffected. However, AP duration (APD) and AP-induced Ca2+ influx (QCa) significantly increased exclusively in epicardial myocytes, thus abrogating the normal differences between the groups. Dexamethasone increased Ca2+ transients, contractility and SERCA activity in both regions, the latter possibly due to a decrease in total phospholamban (PLB) and an increase PLBpThr17. These results suggest that corticosteroids are powerful modulators of ICaL, Ca2+ transients and contractility in both endo- and epicardial myocytes, while APD and QCa are increased in epicardial myocytes only. This indicates that increased ICaL and SERCA activity rather than QCa are the primary drivers of contractility by adrenocorticoids.
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Affiliation(s)
- Caroline Wacker
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany
| | - Niklas Dams
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany
| | - Alexander Schauer
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany
| | - Anne Ritzer
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany
| | - Tilmann Volk
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany. .,Muscle Research Center Erlangen (MURCE), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
| | - Michael Wagner
- Institut für Zelluläre und Molekulare Physiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany. .,Abteilung für Rhythmologie, Herzzentrum Dresden, Fetscherstraße 76, 01307, Dresden, Germany.
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Dilly KW, Rossow CF, Votaw VS, Meabon JS, Cabarrus JL, Santana LF. Mechanisms underlying variations in excitation-contraction coupling across the mouse left ventricular free wall. J Physiol 2006; 572:227-41. [PMID: 16423856 PMCID: PMC1779645 DOI: 10.1113/jphysiol.2005.102020] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Ca(2+) release during excitation-contraction (EC) coupling varies across the left ventricular free wall. Here, we investigated the mechanisms underlying EC coupling differences between mouse left ventricular epicardial (Epi) and endocardial (Endo) myocytes. We found that diastolic and systolic [Ca(2+)](i) was higher in paced Endo than in Epi myocytes. Our data indicated that differences in action potential (AP) waveform between Epi and Endo cells only partially accounted for differences in [Ca(2+)](i). Rather, we found that the amplitude of the [Ca(2+)](i) transient, but not its trigger - the Ca(2+) current - was larger in Endo than in Epi cells. We also found that spontaneous Ca(2+) spark activity was about 2.8-fold higher in Endo than in Epi cells. Interestingly, ryanodine receptor type 2 (RyR2) protein expression was nearly 2-fold higher in Endo than in Epi myocytes. Finally, we observed less Na(+)-Ca(2+) exchanger function in Endo than in Epi cells, which was associated with decreased Ca(2+) efflux during the AP; this contributed to higher diastolic [Ca(2+)](i) and SR Ca(2+) in Endo than in Epi cells during pacing. We propose that transmural differences in AP waveform, SR Ca(2+) release, and Na(+)-Ca(2+) exchanger function underlie differences in [Ca(2+)](i) and EC coupling across the left ventricular free wall.
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Affiliation(s)
- Keith W Dilly
- Department of Physiology and Biophysics, University of Washington, Box 357290, Seattle, WA 98195, USA
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Liew R, Stagg MA, MacLeod KT, Collins P. The red wine polyphenol, resveratrol, exerts acute direct actions on guinea-pig ventricular myocytes. Eur J Pharmacol 2005; 519:1-8. [PMID: 16102748 DOI: 10.1016/j.ejphar.2005.06.017] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2005] [Revised: 06/09/2005] [Accepted: 06/14/2005] [Indexed: 10/25/2022]
Abstract
Epidemiological evidence suggests that moderate consumption of red wine may be cardioprotective, although the precise mechanism(s) responsible remains poorly understood. We hypothesized that the red wine polyphenol, resveratrol, may exert direct actions on the heart and thus potentially contribute to cardioprotection. We show that resveratrol acutely decreases Ca2+ transient amplitude in isolated cardiac myocytes. Intriguingly, resveratrol simultaneously increases cell shortening in half the cells tested, while decreasing shortening in the other half. The former could be attributed to heightened myofilament Ca2+ sensitivity. This was no longer observed in myocytes that had been incubated with the oestrogen receptor antagonist, ICI 182,780, suggesting an oestrogen-receptor dependent mechanism of action. In addition, resveratrol significantly decreased action potential duration and the peak L-type Ca2+ current. Our findings provide evidence that resveratrol exerts multiple direct actions on cardiac myocytes, the net result of which is no overall change in cell contraction. The clinical significance of these results remains to be determined.
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Affiliation(s)
- Reginald Liew
- Cardiac Medicine, National Heart and Lung Institute, Imperial College London, Dovehouse Street, London, SW3 6LY, United Kingdom
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Verkerk AO, Tan HL, Ravesloot JH. Ca2+-activated Cl- current reduces transmural electrical heterogeneity within the rabbit left ventricle. ACTA ACUST UNITED AC 2004; 180:239-47. [PMID: 14962005 DOI: 10.1111/j.0001-6772.2003.01252.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Various cationic membrane channels contribute to the heterogeneity of action potential configuration between the transmural layers of the left ventricle. The role of anionic membrane channels is less intensively studied. We investigated the role of the Ca2+-activated Cl- current, ICl(Ca), in transmural electrical heterogeneity. METHODS AND RESULTS We determined the density of ICl(Ca) and its physiological role in subepicardial and subendocardial ventricular myocytes of rabbit using the patch-clamp technique. ICl(Ca) was measured as the 4,4'diisothiocyanatostilbene-2,2'-disulphonic acid (DIDS) sensitive current. The current-voltage relationships and the densities of ICl(Ca) were similar in subepicardial and subendocardial myocytes. However, the functional role of ICl(Ca) exhibited striking differences. In subendocardial myocytes, blockade of ICl(Ca) by DIDS increased action potential duration (APD) significantly at all measured stimulus frequencies (3.33-0.2 Hz). In subepicardial myocytes, ICl(Ca) blockade increased APD only at 3.33 Hz, but not at the lower stimulus frequencies. At 1 Hz, ICl(Ca) blockade in subepicardial myocytes only caused an APD increase when the transient outward K+ current, Ito1, was blocked. CONCLUSIONS The densities and gating properties of ICl(Ca) are similar in subepicardial and subendocardial myocytes. ICl(Ca) contributes to APD shortening in subendocardial, but not in subepicardial myocytes except at 3.33 Hz. These differences in functional expression of ICl(Ca) reduce the electrical heterogeneity in rabbit left ventricle.
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Affiliation(s)
- A O Verkerk
- Department of Physiology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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Quinn FR, Currie S, Duncan AM, Miller S, Sayeed R, Cobbe SM, Smith GL. Myocardial infarction causes increased expression but decreased activity of the myocardial Na+-Ca2+ exchanger in the rabbit. J Physiol 2003; 553:229-42. [PMID: 12949221 PMCID: PMC2343488 DOI: 10.1113/jphysiol.2003.050716] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Na+-Ca2+ exchanger (NCX) protein levels and activity were measured in myocardium from the basal region of the left ventricle of rabbit hearts with significant left ventricular dysfunction (LVD), 8-9 weeks after an apical infarction. NCX protein abundance was higher in the tissue homogenates (121 +/- 11%) and purified membrane fractions (143 +/- 12%) in the LVD compared to the sham-operated (sham) group. NCX mRNA was also higher in the LVD group (126%). Lower NCX protein expression was observed in the membrane fractions from the epicardium compared to the endocardium in both the sham and LVD groups. Transmembrane currents were recorded in isolated cardiomyocytes by single-electrode voltage clamp; [Ca2+]i was measured using Fura-2. Rapid application of 10 mmol l-1 caffeine was used to induce Ca2+ release from the sarcoplasmic reticulum. The subsequent NCX-mediated Ca2+ efflux rate constant was lower (70% of sham) in the LVD group. NCX currents were measured in cardiomyocytes dialysed with 250 nM Ca2+ (50 mmol l-1 EGTA). A lower NCX current (75% of sham) was observed in the LVD group. Lower NCX activity was also observed in cardiomyocytes isolated from the epicardium compared to the endocardium; a transmural difference that was also seen in the LVD group. Reduced activity despite increased protein expression may result from reduced Ca2+ sensitivity of the allosteric regulation of NCX. However, measurements indicated increased Ca2+ sensitivity in the LVD group. Cardiomyocytes from LVD hearts displayed a marked reduction in the transverse tubule area (59% of sham) and the surface area/volume ratio (80% of sham). Disrupted transverse tubule structure may contribute to the decrease in NCX activity despite increased protein expression in LVD.
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Affiliation(s)
- F R Quinn
- Division of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, UK
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Liew R, Macleod KT, Collins P. Novel stimulatory actions of the phytoestrogen genistein: effects on the gain of cardiac excitation-contraction coupling. FASEB J 2003; 17:1307-9. [PMID: 12759336 DOI: 10.1096/fj.02-0760fje] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Genistein, a phytoestrogen found abundantly in soy products, is thought to be cardioprotective, partly through its ability to act as a natural Ca2+ channel antagonist. However, the precise nature and significance of such direct cardiac actions remain obscure. We investigated the hypothesis that genistein exerts important additional actions on cardiac excitation-contraction coupling (ECC). Genistein acutely increased cell shortening and the Ca2+ transient in field stimulated guinea-pig ventricular myocytes despite potently inhibiting the L-type Ca2+ current, I(Ca,L). The specific phosphotyrosine phosphatase inhibitor, bpV(phen), diminished the stimulatory effects of genistein on myocyte contractility, suggesting that the mechanism partly involved tyrosine kinase inhibition. Genistein increased sarcoplasmic reticulum (SR) Ca2+ load as measured with a caffeine pulse in Na+-free/ Ca2+-free solution. Furthermore, in the continued presence of caffeine, genistein increased the time constant of decline of the caffeine-induced Ca2+ transient, implying impaired sarcolemmal Na+/Ca2+ exchanger function. Tetanization studies in intact myocytes revealed that 43% of cells exhibited increased myofilament Ca2+ sensitivity in the presence of genistein. These findings demonstrate novel cardiac actions of genistein on the SR Ca2+ load, Na+/Ca2+ exchanger, and myofilament Ca2+ sensitivity, which result in an overall increase in myocyte contractility and consequently the gain of ECC.
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Affiliation(s)
- Reginald Liew
- Department of Cardiac Medicine, National Heart and Lung Institute, Imperial College, Dovehouse St., London SW3 6LY, UK.
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Cazorla O, Le Guennec JY, White E. Length-tension relationships of sub-epicardial and sub-endocardial single ventricular myocytes from rat and ferret hearts. J Mol Cell Cardiol 2000; 32:735-44. [PMID: 10775479 DOI: 10.1006/jmcc.2000.1115] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In vivo the sub-epicardial myocardium (EPI) and sub-endocardial myocardium (ENDO) operate over different ranges of sarcomere length (SL). However, it has not been previously shown whether EPI and ENDO work upon different ranges of the same or differing length-tension curves. We have compared the SL-tension relationship of intact, single ventricular EPI and ENDO myocytes from rat and ferret hearts. Cells were attached to carbon fibres of known compliance in order to stretch them and to record force at rest (passive tension) and during contractions (active tension). In both species, ENDO cells were significantly stiffer (i.e. had steeper SL-passive tension relationships) than EPI cells. Ferret ENDO cells had significantly steeper SL-active tension relationships than EPI cells; rat cells tended to behave similarly but no significant regional differences in active properties were observed. There were no inter-species differences in the active and passive properties of EPI cells, but ferret ENDO cells displayed significantly steeper passive and active SL-tension relationships than rat ENDO. We conclude that in vivo, ferret EPI and ENDO myocytes will function over different ranges of different SL-tension curves. There is a close relationship between SL and active tension (the Frank-Starling law of the heart), and our observations suggest that regional differences in the response to ventricular dilation will depend on both the change in SL and differing regional slopes of the SL-active tension curves.
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Affiliation(s)
- O Cazorla
- Laboratoire de Physiologie des Cellules Cardiaques et Vasculaires, CNRS, UMR6542, Parc de Grandmont, Tours, 37200, France
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Yang ZK, Boyett MR, Janvier NC, McMorn SO, Shui Z, Karim F. Regional differences in the negative inotropic effect of acetylcholine within the canine ventricle. J Physiol 1996; 492 ( Pt 3):789-806. [PMID: 8734990 PMCID: PMC1158900 DOI: 10.1113/jphysiol.1996.sp021346] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
1. Regional differences in the effects of ACh on sub-epicardial, mid-wall and sub-endocardial cells of the dog left ventricle have been studied. 2. ACh produced a dose-dependent, atropine-sensitive negative inotropic effect that was greatest in sub-epicardial cells and small or absent in sub-endocardial cells. 3. In sub-epicardial (but not sub-endocardial) cells, ACh also resulted in a dose-dependent decrease in action potential duration. The inotropic effect of ACh on sub-epicardial cells was primarily the result of the decrease of action potential duration, because during trains of voltage clamp pulses the inotropic effect of ACh was reduced or abolished. At a holding potential of -80 mV, 10(-5)M ACh decreased L-type Ca2+ current by approximately 8% and this is thought to be responsible for the small inotropic effect during trains of pulses. 4. Although 4-AP, a blocker of the transient outward current (I(to)), abolished the "spike and dome' morphology of the sub-epicardial action potential, it had little or no effect on the actions of ACh on sub-epicardial cells. ACh had no effect on I(to) in sub-epicardial cells in voltage clamp experiments. 5. ACh activated a Ba(2+)-sensitive outward current (IK,ACh) in sub-epicardial cells, but little or no such current in sub-endocardial cells. In sub-epicardial cells, ACh also inhibited the inward rectifier current, IK,1. 6. It is concluded that in left ventricular sub-epicardial cells, ACh activates IK,ACh. This results in a shortening of the action potential and, therefore, a negative inotropic effect. In subendocardial cells, ACh activates little or no IK,ACh and, therefore, it has little or no negative inotropic effect. This may result from a regional variation in the expression of the muscarinic K+ channel.
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Affiliation(s)
- Z K Yang
- Department of Physiology, University of Leeds, UK
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