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Arozal W, Monayo ER, Barinda AJ, Perkasa DP, Soetikno V, Nafrialdi N, Louisa M. Protective effects of silver nanoparticles in isoproterenol-induced myocardial infarction in rats. Front Med (Lausanne) 2022; 9:867497. [PMID: 36091690 PMCID: PMC9454814 DOI: 10.3389/fmed.2022.867497] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 08/04/2022] [Indexed: 12/07/2022] Open
Abstract
Background Silver nanoparticles (AgNPs) are widely used in the medical field, including cardiovascular. However, limited research has investigated the effect of AgNPs on the protection of myocardial infarction (MI). Objectives Isoproterenol (Iso)-induced MI and the cardiac protection offered by AgNPs were investigated in the present study. Additionally, we characterized the profile of Ag in the form of nanoparticles. Methods Twenty-four male Wistar rats were randomly divided into four groups as follows: normal, Iso, Iso + AgNO3, and Iso + AgNP groups. AgNPs and silver ion (AgNO3) were administered intraperitoneally at 2.5 mg/kg BW for 14 days. Iso induction was performed using two doses of 85 mg/kg BW given subcutaneously on days 13 and 14. Blood and cardiac tissue samples were taken 24 h after the last dose of Iso and checked for Creatine Kinase-MB (CK-MB), lactate dehydrogenase in plasma along with oxidative stress parameters, mitochondria biogenesis markers, and inflammation representative genes in cardiac tissue. Additionally, we analyzed the histopathological features in cardiac tissue. Results The silver was confirmed in the form of nanoparticles by its size at intervals of 8.72-37.84 nm. Both AgNO3 and AgNPs showed similar cardioprotective effects, as shown by the decrease in biochemical markers of cardiac toxicity, namely, CK-MB. Additionally, AgNPs group have better efficacy compared with AgNO3 group in ameliorating Iso-mediated oxidative stress production, as evidenced by the significant decrease in malondialdehyde level and increased superoxide dismutase activity (P < 0.0001 and P < 0.01, respectively) in cardiac tissue compared with the Iso group. Mechanistically, AgNPs, but not AgNO3, enhanced the expression levels of mitochondrial transcription factor A and peroxisome proliferator-activated receptor-gamma coactivator 1-alpha in post-MI heart and reduced the protein expression of nuclear factor-kappa B (NF-κB) assessed by western blot analysis. Furthermore, these results were confirmed with the histopathological evaluation of cardiac tissue. Nevertheless, pretreatment with either AgNO3 or AgNPs improved the aspartate aminotransferase level. Conclusion These results suggested that AgNPs have more superior cardioprotective effect compared with AgNO3 against Iso-induced MI, at least in part through amelioration of NF-κB expression level induced by oxidative stress overproduction.
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Affiliation(s)
- Wawaimuli Arozal
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | - Edwina Rogayah Monayo
- Doctoral Program in Biomedical Sciences, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
- Faculty of Medicine Universitas Negeri Gorontalo, Gorontalo, Indonesia
| | - Agian Jeffilano Barinda
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
- Metabolic, Cardiovascular and Aging Cluster, The Indonesian Medical Education and Research Institute, Faculty of Medicine Universitas Indonesia, Jakarta, Indonesia
| | - Dian Pribadi Perkasa
- Doctoral Program in Biomedical Sciences, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
- Research Center for Radiation Process Technology, Research Organization for Nuclear Energy, National Research and Innovation Agency, Jakarta, Indonesia
| | - Vivian Soetikno
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | - Nafrialdi Nafrialdi
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
| | - Melva Louisa
- Department of Pharmacology and Therapeutics, Faculty of Medicine, Universitas Indonesia, Jakarta, Indonesia
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Li L, Zhang Q, Lei X, Huang Y, Hu J. MAP4 as a New Candidate in Cardiovascular Disease. Front Physiol 2020; 11:1044. [PMID: 32982783 PMCID: PMC7479186 DOI: 10.3389/fphys.2020.01044] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 07/29/2020] [Indexed: 12/30/2022] Open
Abstract
Microtubule and mitochondrial dysfunction have been implicated in the pathogenesis of cardiovascular diseases (CVDs), including cardiac hypertrophy, fibrosis, heart failure, and hypoxic/ischemic related heart dysfunction. Microtubule dynamics instability leads to disrupted cell homeostasis and cell shape, decreased cell survival, and aberrant cell division and cell cycle, while mitochondrial dysfunction contributes to abnormal metabolism and calcium flux, increased cell death, oxidative stress, and inflammation, both of which causing cell and tissue dysfunction followed by CVDs. A cytosolic skeleton protein, microtubule-associated protein 4 (MAP4), belonging to the family of microtubule-associated proteins (MAPs), is widely expressed in non-neural cells and possesses an important role in microtubule dynamics. Increased MAP4 phosphorylation results in microtubule instability. In addition, MAP4 also expresses in mitochondria and reveals a crucial role in maintaining mitochondrial homeostasis. Phosphorylated MAP4 promotes mitochondrial apoptosis, followed by cardiac injury. The aim of the present review is to highlight the novel role of MAP4 as a potential candidate in multiple cardiovascular pathologies.
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Affiliation(s)
- Lingfei Li
- Department of Dermatology, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Qiong Zhang
- Institute of Burn Research, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University (Army Medical University), Chongqing, China
| | - Xia Lei
- Department of Dermatology, Daping Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Yuesheng Huang
- Institute of Burn Research, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China.,State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University (Army Medical University), Chongqing, China
| | - Jiongyu Hu
- State Key Laboratory of Trauma, Burns and Combined Injury, Third Military Medical University (Army Medical University), Chongqing, China.,Department of Endocrinology, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
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Kitakaze M. Dysfunction of microtubules induces cardiac dysfunction. EBioMedicine 2018; 37:3-4. [PMID: 30337248 PMCID: PMC6286635 DOI: 10.1016/j.ebiom.2018.10.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 10/08/2018] [Indexed: 12/27/2022] Open
Affiliation(s)
- Masafumi Kitakaze
- Department of Clinical Medicine and Development, National Cerebral and Cardiovascular Centre, 5-7-1 Fujishirodai, Suita 565-8565, Japan.
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Garson C, Kelly-Laubscher R, Blackhurst D, Gwanyanya A. Lack of cardioprotection by single-dose magnesium prophylaxis on isoprenaline-induced myocardial infarction in adult Wistar rats. Cardiovasc J Afr 2015. [PMID: 26212925 PMCID: PMC4780018 DOI: 10.5830/cvja-2015-055] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Aim Magnesium (Mg2+) is effective in treating cardiovascular disorders such as arrhythmias and pre-eclampsia, but its role during myocardial infarction (MI) remains uncertain. In this study, we investigated the effects of Mg2+ pre-treatment on isoprenaline (ISO)-induced MI in vivo. Methods Rats divided into four groups were each pre-treated with either MgSO4 (270 mg/kg intraperitoneally) or an equivalent volume of physiological saline, prior to the ISO (67 mg/kg subcutaneously) or saline treatments. One day post-treatment, the electrocardiogram and left ventricular blood pressures were recorded. Infarcts were determined using 2,3,5-triphenyltetrazolium chloride staining, and serum markers of lipid peroxidation were measured with spectrophotometric assays. Results Mg2+ pre-treatment neither altered the ISO-induced infarct size compared with ISO treatment alone (p > 0.05), nor reversed the low-voltage electrocardiogram or the prominent Q waves induced by ISO, despite a trend to decreased Q waves. Similarly, Mg2+ did not prevent the ISO-induced decrease in peak left ventricular blood pressure or the decrease in minimal rate of pressure change. Mg2+ did not reverse the ISO-induced gain in heart weight or loss of body weight. Neither ISO nor Mg2+ altered the concentrations of lipid peroxidation markers 24 hours post MI induction. Conclusion Although Mg2+ had no detrimental effects on electrical or haemodynamic activity in ISO-induced MI, the lack of infarct prevention may detract from its utility in MI therapy.
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Affiliation(s)
- Christie Garson
- Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Roisin Kelly-Laubscher
- Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Dee Blackhurst
- Department of Clinical Laboratory Sciences, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
| | - Asfree Gwanyanya
- Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa.
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WANG DEGUO, XING WEN, WANG XIN, ZHU HONGJUN. Taxol stabilizes gap junctions and reduces ischemic ventricular arrhythmias in rats in vivo. Mol Med Rep 2014; 11:3243-8. [DOI: 10.3892/mmr.2014.3137] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 11/12/2014] [Indexed: 11/05/2022] Open
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Sun BL, He MQ, Han XY, Sun JY, Yang MF, Yuan H, Fan CD, Zhang S, Mao LL, Li DW, Zhang ZY, Zheng CB, Yang XY, Li YV, Stetler RA, Chen J, Zhang F. Intranasal Delivery of Granulocyte Colony-Stimulating Factor Enhances Its Neuroprotective Effects Against Ischemic Brain Injury in Rats. Mol Neurobiol 2014; 53:320-330. [DOI: 10.1007/s12035-014-8984-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 11/03/2014] [Indexed: 12/20/2022]
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Ye J, Zhang W, Guo Y. Arabidopsis SOS3 plays an important role in salt tolerance by mediating calcium-dependent microfilament reorganization. PLANT CELL REPORTS 2013; 32:139-48. [PMID: 23052592 DOI: 10.1007/s00299-012-1348-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 09/11/2012] [Accepted: 09/11/2012] [Indexed: 05/23/2023]
Abstract
KEY MESSAGE : SOS3 mediates calcium dependent actin filament reorganization that plays important roles in plant responses to salt stress. Arabidopsis salt overly sensitive 3 (SOS3) plays an important role in plant salt tolerance by regulation of Na(+)/K(+) homeostasis. Plants lacking SOS3 are hypersensitive to salt stress and this phenomenon can be partially rescued by the addition of calcium. However the mechanism underlying remains elusive. We here report that the organization of actin filaments in sos3 mutant differs from that in wild-type plant. Under salt stress abnormal actin assembly and arrangement in sos3 are more pronounced, which can be partially complemented by addition of external calcium or low concentration of latrunculin A, an actin monomer-sequestering agent. The effects of calcium and Lat A on actin filament organization of sos3 mutant are accordant with their effects on sos3 salt sensitivity under salt stress. These findings indicate that the salt-hypersensitivity of sos3 mutant partially results from its disordered actin filaments, and SOS3 mediated actin filament reorganization plays important roles in plant responses to salt stress.
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Affiliation(s)
- Jiamin Ye
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
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Hu JY, Chu ZG, Han J, Dang YM, Yan H, Zhang Q, Liang GP, Huang YS. The p38/MAPK pathway regulates microtubule polymerization through phosphorylation of MAP4 and Op18 in hypoxic cells. Cell Mol Life Sci 2010; 67:321-33. [PMID: 19915797 PMCID: PMC11115776 DOI: 10.1007/s00018-009-0187-z] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2009] [Revised: 10/13/2009] [Accepted: 10/16/2009] [Indexed: 02/07/2023]
Abstract
In both cardiomyocytes and HeLa cells, hypoxia (1% O(2)) quickly leads to microtubule disruption, but little is known about how microtubule dynamics change during the early stages of hypoxia. We demonstrate that microtubule associated protein 4 (MAP4) phosphorylation increases while oncoprotein 18/stathmin (Op18) phosphorylation decreases after hypoxia, but their protein levels do not change. p38/MAPK activity increases quickly after hypoxia concomitant with MAP4 phosphorylation, and the activated p38/MAPK signaling leads to MAP4 phosphorylation and to Op18 dephosphorylation, both of which induce microtubule disruption. We confirmed the interaction between phospho-p38 and MAP4 using immunoprecipitation and found that SB203580, a p38/MAPK inhibitor, increases and MKK6(Glu) overexpression decreases hypoxic cell viability. Our results demonstrate that hypoxia induces microtubule depolymerization and decreased cell viability via the activation of the p38/MAPK signaling pathway and changes the phosphorylation levels of its downstream effectors, MAP4 and Op18.
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Affiliation(s)
- Jiong-Yu Hu
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, Southwest Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
| | - Zhi-Gang Chu
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, Southwest Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
| | - Jian Han
- Department of Gynecology and Obstetrics, Daping Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
| | - Yong-ming Dang
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, Southwest Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
| | - Hong Yan
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, Southwest Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
| | - Qiong Zhang
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, Southwest Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
| | - Guang-ping Liang
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, Southwest Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
| | - Yue-Sheng Huang
- State Key Laboratory of Trauma, Burns and Combined Injury, Institute of Burn Research, Southwest Hospital, The Third Military Medical University, 400038 Chongqing, People’s Republic of China
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9
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Yang F, Li Y, Ding B, Nie J, Wang H, Zhang X, Wang C, Ling S, Ni C, Dai Z, Tan Y, Wan Y. Reduced function and disassembled microtubules of cultured cardiomyocytes in spaceflight. Sci Bull (Beijing) 2008. [DOI: 10.1007/s11434-008-0167-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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10
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Jin YT, Hasebe N, Matsusaka T, Natori S, Ohta T, Tsuji S, Kikuchi K. Magnesium attenuates isoproterenol-induced acute cardiac dysfunction and β-adrenergic desensitization. Am J Physiol Heart Circ Physiol 2007; 292:H1593-9. [PMID: 17114241 DOI: 10.1152/ajpheart.00985.2006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sympathetic nervous activation is a crucial compensatory mechanism in heart failure. However, excess catecholamine may induce cardiac dysfunction and β-adrenergic desensitization. Although magnesium is known to be a cardioprotective agent, its beneficial effects on acute cardiac dysfunction remain to be elucidated. We examined the effects of magnesium on left ventricular (LV) dysfunction induced by a large dose of isoproterenol in dogs. Sixteen anesthetized dogs underwent a continuous infusion of isoproterenol (1 μg·kg−1·min−1) with or without a magnesium infusion (1 mg·kg−1·min−1). The dose response to small doses of isoproterenol (0.025–0.2 μg·kg−1·min−1) was tested hourly. A large dose of isoproterenol decreased LV systolic function, increased the time constant of LV isovolumic relaxation, and suppressed the dose response to small doses of isoproterenol in a time-dependent manner. Magnesium significantly attenuated isoproterenol-induced LV systolic and diastolic dysfunction and preserved the dose response to isoproterenol. Serum-ionized calcium significantly decreased with a large dose of isoproterenol but was fully maintained at baseline level with magnesium. A large dose of isoproterenol increased serum lipid peroxide levels and serological markers of myocardial damage, which were significantly suppressed by magnesium. In conclusion, magnesium significantly attenuated excess isoproterenol-induced acute cardiac dysfunction and β-adrenergic desensitization.
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Affiliation(s)
- Yin-Tie Jin
- Dept of Internal Medicine, Division of Cardiology, Asahikawa Medical College, 2-1-1-1 Midorigaoka Higashi, Asahikawa, Hokkaido, Japan
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11
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Abstract
The Frank-Starling mechanism, by which load directly regulates muscle length and thus performance is the means by which the mechanics and energetics of cardiac muscle are regulated on a beat-to-beat basis. When this short-term compensation for increased load is insufficient, the long-term compensation of cardiac hypertrophy ensues. The simplest and most direct mechanism for load regulation of cardiac mass would obtain if an analog of the short-term Frank-Starling mechanism of functional regulation operated in the long-term time domain of mass regulation; that is, if heart muscle were able to directly transduce increased load into growth. It is now clear that load does indeed serve as a direct regulator of cardiac mass in the adult. Cardiac hypertrophy, at the levels of intact animal, isolated tissue, and cultured cells, is a direct response of the adult mammalian cardiocyte to increased load, modified by but without the requisite involvement of factors external to the cell. The extent to which such hypertrophy is compensatory is critically dependent on the type of hemodynamic overload that serves as the hypertrophic stimulus. Thus, cardiac hypertrophy is not intrinsically maladaptive; rather, it is the nature of the inducing load rather than hypertrophy itself that is responsible for the frequent deterioration of initially compensatory hypertrophy into the congestive heart failure state. As one example reviewed here of this load specificity of maladaptation, increased microtubule network density is a persistent feature of severely pressure overloaded, hypertrophied and failing myocardium which imposes a viscous load on active myofilaments during contraction.
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Affiliation(s)
- G Cooper
- Gazes Cardiac Research Institute, Medical University of South Carolina, Department of Veterans Affairs Medical Center, Charleston 29403, USA.
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12
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Nakajima-Takenaka C, Sakata S, Kato S, Ohga Y, Murata KY, Taniguchi S, Takaki M. Detrimental effects after dobutamine infusion on rat left ventricular function: mechanical work and energetics. Exp Physiol 2005; 90:635-44. [PMID: 15849228 DOI: 10.1113/expphysiol.2005.030460] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We have previously reported that continuous infusion of dobutamine into the coronary artery induces positive inotropic effects but induces no detrimental effects in cross-circulated, excised normal rat hearts and even in Ca2+ overload-induced contractile failing rat hearts. However, we hypothesized that some detrimental effects on left ventricular (LV) function are induced after continuous dobutamine infusion and the following clearance of blood dobutamine, as is the case after beta-adrenergic receptor stimulation. To test this hypothesis, we investigated LV mechanical work and energetics in the same type of preparations that underwent continuous dobutamine infusion and clearance of blood dobutamine. We found that both mean end-systolic pressure and systolic pressure-volume area (PVA; a measure of total mechanical energy per beat) at midrange LV volume were significantly (P < 0.01) decreased. The mean myocardial oxygen consumption per beat intercept, which is composed of for the total Ca2+ handling in excitation-contraction coupling and basal metabolism, of the and PVA linear relation was also significantly (P < 0.05) decreased (n=8). The mean slope of the linear relation was unchanged in such hearts. Post-dobutamine basal metabolism was unchanged (n = 5 of the 8 hearts). The moderate proteolysis of a cytoskeleton protein, alpha-fodrin was identified (n = 7 of the 8 hearts with the decreased intercept), after clearance of blood dobutamine. In agreement with our hypothesis, the detrimental effect of the post-beta-adrenergic receptor stimulation was induced by a moderate concentration of dobutamine; we found systolic dysfunction due to the impairment of Ca2+ handling in excitation-contraction coupling in the rat LV and proteolysis of a cytoskeleton protein, alpha-fodrin.
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Affiliation(s)
- Chikako Nakajima-Takenaka
- Department of Physiology II, Nara Medical University School of Medicine, 840 Shijo-cho, Kashihara, Nara 634-8521, Japan
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Belmadani S, Poüs C, Fischmeister R, Méry PF. Post-translational modifications of tubulin and microtubule stability in adult rat ventricular myocytes and immortalized HL-1 cardiomyocytes. Mol Cell Biochem 2004; 258:35-48. [PMID: 15030168 DOI: 10.1023/b:mcbi.0000012834.43990.b6] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Little is known about the subcellular distribution and the dynamics of tubulins in adult cardiac myocytes although both are modified during cardiac hypertrophy and heart failure. Using confocal microscopy, we examined post-translational modifications of tubulin in fully differentiated ventricular myocytes isolated from adult rat hearts, as well as in immortalized and dividing HL-1 cardiomyocytes. Detyrosinated Glu-alpha-tubulin was the most abundant post-translationally modified tubulin found in ventricular myocytes, while acetylated- and delta2-alpha-tubulins were found in lower amounts or absent. In contrast, dividing HL-1 cardiomyocytes exhibited high levels of tyrosinated or acetylated alpha-tubulins. A mild nocodazole treatment (0.1 microM, 1 h) disrupted microtubules in HL-1 myocytes, but not in adult ventricular myocytes. A stronger treatment (10 microM, 2 h) was required to disassemble tubulins in adult myocytes. Glu-alpha-tubulin containing microtubules were more resistant to nocodazole treatment in HL-1 cardiomyocytes than in ventricular myocytes. Endogenous activation of the cAMP pathway with the forskolin analog L858051 (20 microM) or the beta-adrenergic agonist isoprenaline (10 microM) disrupted the most labile microtubules in HL-1 cardiomyocytes. In contrast, isoprenaline (10 microM), cholera toxin (200 ng/ml, a G(S)-protein activator), L858051 (20 microM) or forskolin (10 microM) had no effect on the microtubule network in ventricular myocytes. In addition, intracellular Ca2+ accumulation induced either by thapsigargin (2 microM) or caffeine (10 mM) did not modify microtubule stability in ventricular myocytes. Our data demonstrate the unique stability of the microtubule network in adult cardiac myocytes. We speculate that microtubule stability is required to support cellular integrity during cardiac contraction.
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Affiliation(s)
- Souad Belmadani
- Laboratoire de Cardiologie Cellulaire et Moléculaire, INSERM U-446, Université Paris-Sud, Faculté de Pharmacie, Châtenay-Malabry, France.
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Calaghan SC, Le Guennec JY, White E. Cytoskeletal modulation of electrical and mechanical activity in cardiac myocytes. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2004; 84:29-59. [PMID: 14642867 DOI: 10.1016/s0079-6107(03)00057-9] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The cardiac myocyte has an intracellular scaffold, the cytoskeleton, which has been implicated in several cardiac pathologies including hypertrophy and failure. In this review we describe the role that the cytoskeleton plays in modulating both the electrical activity (through ion channels and exchangers) and mechanical (or contractile) activity of the adult heart. We focus on the 3 components of the cytoskeleton, actin microfilaments, microtubules, and desmin filaments. The limited visual data available suggest that the subsarcolemmal actin cytoskeleton is sparse in the adult myocyte. Selective disruption of cytoskeletal actin by pharmacological tools has yet to be verified in the adult cell, yet evidence exists for modulation of several ionic currents, including I(CaL), I(Na), I(KATP), I(SAC) by actin microfilaments. Microtubules exist as a dense network throughout the adult cardiac cell, and their structure, architecture, kinetics and pharmacological manipulation are well described. Both polymerised and free tubulin are functionally significant. Microtubule proliferation reduces contraction by impeding sarcomeric motion; modulation of sarcoplasmic reticulum Ca(2+) release may also be involved in this effect. The lack of effect of microtubule disruption on cardiac contractility in adult myocytes, and the concentration-dependent modulation of the rate of contraction by the disruptor nocodazole in neonatal myocytes, support the existence of functionally distinct microtubule populations. We address the controversy regarding the stimulation of the beta-adrenergic signalling pathway by free tubulin. Work with mice lacking desmin has demonstrated the importance of intermediate filaments to normal cardiac function, but the precise role that desmin plays in the electrical and mechanical activity of cardiac muscle has yet to be determined.
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Affiliation(s)
- S C Calaghan
- School of Biomedical Sciences, University of Leeds, Leeds LS2 9JT, UK
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15
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Banan A, Fields JZ, Zhang Y, Keshavarzian A. Key role of PKC and Ca2+ in EGF protection of microtubules and intestinal barrier against oxidants. Am J Physiol Gastrointest Liver Physiol 2001; 280:G828-43. [PMID: 11292590 DOI: 10.1152/ajpgi.2001.280.5.g828] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Using monolayers of human intestinal (Caco-2) cells, we showed that growth factors (GFs) protect microtubules and barrier integrity against oxidative injury. Studies in nongastrointestinal cell models suggest that protein kinase C (PKC) signaling is key in GF-induced effects and that cytosolic calcium concentration ([Ca2+](i)) is essential in cell integrity. We hypothesized that GF protection involves activating PKC and maintaining normal ([Ca2+](i)) Monolayers were pretreated with epidermal growth factor (EGF) or PKC or Ca2+ modulators before exposure to oxidants (H2O2 or HOCl). Oxidants disrupted microtubules and barrier integrity, and EGF protected from this damage. EGF caused rapid distribution of PKC-alpha, PKC-betaI, and PKC-zeta isoforms to cell membranes, enhancing PKC activity of membrane fractions while reducing PKC activity of cytosolic fractions. EGF enhanced (45)Ca2+ efflux and prevented oxidant-induced (sustained) rises in ([Ca2+](i)). PKC inhibitors abolished and PKC activators mimicked EGF protection. Oxidant damage was mimicked by and potentiated by a Ca2+ ionophore (A-23187), exacerbated by high-Ca2+ media, and prevented by calcium removal or chelation or by Ca2+ channel antagonists. PKC activators mimicked EGF on both (45)Ca2+ efflux and ([Ca2+](i)). Membrane Ca2+-ATPase pump inhibitors prevented protection by EGF or PKC activators. In conclusion, EGF protection of microtubules and the intestinal epithelial barrier requires activation of PKC signal transduction and normalization of ([Ca2+](i)).
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Affiliation(s)
- A Banan
- Department of Internal Medicine (Division of Digestive Diseases), Rush University Medical Center, 1725 W. Harrison, Suite 206, Chicago, IL 60612, USA.
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Shimoni Y. Hormonal control of cardiac ion channels and transporters. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 1999; 72:67-108. [PMID: 10446502 DOI: 10.1016/s0079-6107(99)00005-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Y Shimoni
- Department of Physiology and Biophysics, Faculty of Medicine, University of Calgary, Alta., Canada.
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Vendrell FJ, Ten J, De Oliveira MN, Cano A, Tarin JJ. Effect of intracellular Ca2+ chelation with the acetoxymethyl ester-derived form of bis(o-aminophenoxy)ethane-N,N,N,N',N'-tetraacetic acid on meiotic division and chromosomal segregation in mouse oocytes. J Assist Reprod Genet 1999; 16:276-82. [PMID: 10335476 PMCID: PMC3455705 DOI: 10.1023/a:1020323730908] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE Our purpose was to ascertain the effect of intracellular Ca2+ chelation on the chromosomal distribution and segregation of mouse oocytes during maturation in vitro. METHODS Germinal vesicle oocytes were loaded with the acetoxymethyl ester-derived form of bis(o-aminophenoxy)-ethane-N,N,N',N'-tetraacetic acid (BAPTA-AM). Chromosomal distribution and segregation of control and BAPTA-AM-treated metaphase II (MII) oocytes were evaluated at 16 hr, and intracellular ATP content at 0, 1, and 16 hr after BAPTA-AM loading. RESULTS BAPTA-AM treatment decreased (P < or = 0.05) the potential for in vitro maturation, increased (P < or = 0.0001) the percentage of oocytes displaying an abnormal distribution of metaphase II chromosomes in the meiosis II spindle and aneuploidy, and decreased (P < or = 0.005) the ATP content at 0, 1, and 16 hr of culture compared to the control groups. CONCLUSIONS These findings raise some concern about any other condition/drug that may directly or indirectly decrease the intracellular Ca2+ concentration in human oocytes.
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Affiliation(s)
- F J Vendrell
- Department of Paediatrics, Obstetrics and Gynaecology, Faculty of Medicine, University of Valencia, Spain
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Sys SU, De Keulenaer GW, Brutsaert DL. Reappraisal of the multicellular preparation for the in vitro physiopharmacological evaluation of myocardial performance. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1999; 453:441-50; discussion 451. [PMID: 9889856 DOI: 10.1007/978-1-4684-6039-1_49] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
In order to evaluate myocardial performance, single cardiomyocytes suffer from technical problems and from the fact that some basic functional properties vanish when one moves down the hierarchic scale from multicellularity to single cells. The isolated papillary muscle has at present proven to be superior to the isolated intact cardiomyocyte. A large number of major intra- and extracellular features required to describe myocardial performance can be derived from analyzing twitch contraction and relaxation in the multicellular isolated papillary muscle. In addition, the present paper illustrates the possibility to differentiate between effects of inotropic interventions on activating Ca2+ and Ca2+ sensitivity in multicellular preparations, from a grid analysis of isometric twitches in a coordinate system of peak rate of force development (+dF/dt; reflecting the time pattern of twitch contraction) versus time to half relaxation (tHR; reflecting the time pattern of twitch relaxation). The abundance of information about myocardial performance that can be derived from the easily accessible multicellular preparation reflects its physiological kinship with the intact ventricle.
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Affiliation(s)
- S U Sys
- Department of Physiology and Medicine, University of Antwerp, Belgium.
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Banan A, Smith GS, Rieckenberg CL, Kokoska ER, Miller TA. Protection against ethanol injury by prostaglandin in a human intestinal cell line: role of microtubules. THE AMERICAN JOURNAL OF PHYSIOLOGY 1998; 274:G111-21. [PMID: 9458780 DOI: 10.1152/ajpgi.1998.274.1.g111] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Prostaglandins have been shown to protect the gastrointestinal (GI) epithelium from injury induced by various luminal insults independent of their known acid-inhibitory effects, a process termed "cytoprotection." The mechanism of this protective action remains unknown. The present investigation determined the role of microtubules (a major cytoskeletal component) in GI injury induced by ethanol (EtOH) and its prevention by 16,16-dimethylprostaglandin E2 (dmPGE2) using cells from a human colonic cell line known as Caco-2 cells. These cells were preincubated in Eagle's minimum essential medium with and without dmPGE2 (2.6 microM) for 15 min and subsequently incubated in media containing 1, 2.5, 5, 7.5, and 10% EtOH. The effects on cell viability and tubulin (the major protein backbone of microtubules) were then determined. EtOH concentrations > or = 2.5% extensively disrupted the microtubules as demonstrated by fragmentation, kinking, and perturbation of the microtubule organizer center. EtOH treatment also led to a significant decrease in the S2 (polymerized) fraction and an increase in the S1 (monomeric) pool of tubulin. Concomitant with these effects were marked decreases in cellular viability. DmPGE2 pretreatment abolished the disruption of microtubules, significantly increased the S2 fraction of tubulin, and increased cellular viability in cultures exposed to EtOH. Furthermore, pretreatment with colchicine, an inhibitor of microtubule assembly, prevented the cytoprotective action of dmPGE2. Taxol, a microtubule stabilizing agent, mimicked the effects of dmPGE2 by also enhancing microtubule integrity and increasing cellular viability in cells exposed to EtOH. Our data indicate that organization and stabilization of microtubules may play an essential role in the mechanism of prostaglandin-induced protection.
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Affiliation(s)
- A Banan
- Theodore Cooper Surgical Research Institute, Department of Surgery, Saint Louis University Medical Center, Missouri 63104, USA
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Yoshikawa T, Handa S, Anzai T, Nishimura H, Baba A, Akaishi M, Mitamura H, Ogawa S. Early reduction of neurohumoral factors plays a key role in mediating the efficacy of beta-blocker therapy for congestive heart failure. Am Heart J 1996; 131:329-36. [PMID: 8579029 DOI: 10.1016/s0002-8703(96)90362-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This study examined the role played by neurohumoral factors in mediating the effects of beta-blocker therapy for congestive heart failure. Fifteen patients with congestive heart failure underwent beta-blocker therapy. Plasma norepinephrine and alpha-atrial natriuretic peptide concentrations decreased 2 weeks after initiation of beta-blocker therapy. Decrease in plasma norepinephrine level persisted for 6 months. Lymphocyte beta-adrenoceptor density increased 2 weeks after therapy but was not increased 6 months later. Left ventricular ejection fraction was unchanged 2 weeks after therapy, but it increased 6 months after introduction of beta-blockers. Plasma norepinephrine level decreased 2 weeks after the therapy in the responders (increase in ejection fraction > 0.10) but not in the nonresponders. Thus early reduction of neurohumoral factor levels preceded the late improvement of left ventricular contractile function and may therefore be partly responsible for the efficacy of beta-blocker therapy for congestive heart failure.
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Affiliation(s)
- T Yoshikawa
- Department of Medicine, Keio University School of Medicine, Tokyo, Japan
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