1
|
Alatrag F, Amoni M, Kelly-Laubscher R, Gwanyanya A. Cardioprotective effect of fingolimod against calcium paradox-induced myocardial injury in the isolated rat heart. Can J Physiol Pharmacol 2022; 100:134-141. [PMID: 34559972 DOI: 10.1139/cjpp-2021-0381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fingolimod (FTY720) inhibits Ca2+-permeable, Mg2+-sensitive channels called transient receptor potential melastatin 7 (TRPM7), but its effects on Ca2+ paradox (CP) - induced myocardial damage has not been evaluated. We studied the effect of FTY720 on CP-induced myocardial damage and used other TRPM7 channel inhibitors nordihydroguaiaretic acid (NDGA) and Mg2+ to test if any effect of FTY720 was via TRPM7 inhibition. Langendorff-perfused Wistar rat hearts were treated with FTY720 or NDGA and subjected to a CP protocol consisting of Ca2+ depletion followed by Ca2+ repletion. Hearts of rats pre-treated with MgSO4 were also subjected to CP. Hemodynamic parameters were measured using an intraventricular balloon, and myocardial infarct size was quantified using triphenyltetrazolium chloride stain. TRPM7 proteins in ventricular tissue were detected using immunoblot analysis. FTY720, but not NDGA, decreased CP-induced infarct size. Both FTY720 and NDGA minimized the CP-induced elevation of left ventricular end-diastolic pressure, but only FTY720 ultimately improved ventricular developed pressure. Mg2+ pre-treatment had no effect on CP-induced infarct size, nor hemodynamic parameters during CP, nor the level of TRPM7 protein expression in ventricular tissue. Overall, FTY720 attenuated CP-induced myocardial damage, with potential therapeutic implications on Ca2+-mediated cardiotoxicity; however, the cardioprotective mechanism of FTY720 seems to be unrelated to TRPM7 channel modulation.
Collapse
Affiliation(s)
- Fatma Alatrag
- Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Observatory 7925, Cape Town, South Africa
| | - Matthew Amoni
- Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Observatory 7925, Cape Town, South Africa
| | - Roisin Kelly-Laubscher
- Department of Pharmacology and Therapeutics, The College of Medicine and Health, University College Cork, Ireland
- Department of Biological Sciences, Faculty of Science, University of Cape Town, Rondebosch 7700, Cape Town, South Africa
| | - Asfree Gwanyanya
- Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Observatory 7925, Cape Town, South Africa
| |
Collapse
|
2
|
Liu ZF, Ji JJ, Zheng D, Su L, Peng T. Calpain-2 protects against heat stress-induced cardiomyocyte apoptosis and heart dysfunction by blocking p38 mitogen-activated protein kinase activation. J Cell Physiol 2018; 234:10761-10770. [PMID: 30417356 DOI: 10.1002/jcp.27750] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 10/22/2018] [Indexed: 12/25/2022]
Abstract
Cardiovascular dysfunction is a common complication among heatstroke patients, but its underlying mechanism is unclear. This study was designed to investigate the role of calpain-2 and its downstream signal pathway in heat stress-induced cardiomyocyte apoptosis and heart dysfunction. In cultured primary mouse neonatal cardiomyocytes (MNCs), heat stress (43°C for 2 hr) induced a heat-shock response, as indicated by upregulated heat-shock protein 27 (HSP27) expression and cellular apoptosis, as indicated by increased caspase-3 activity, DNA fragmentation and decreased cell viability. Meanwhile, heat stress decreased calpain activity, which was accompanied by downregulated calpain-2 expression and increased phosphorylation of p38, extraceIIuIar signaI-reguIated protein kinase (ERK1/2) and c-Jun N-terminaI kinase (JNK). Calpain-2 overexpression abrogated heat stress-induced apoptosis and phosphorylation of p38 and JNK, but not of ERK1/2. Blocking only p38 prevented heat stress-induced apoptosis in MNCs. In cardiac-specific calpain-2 overexpressing transgenic mice, p38 phosphorylation and cardiomyocyte apoptosis were decreased in the heart tissue of heatstroke mice, as revealed by western blot and terminal deoxynucleotidyl transferase dUTP nick end labelling assays, respectively. M-mode echocardiography also demonstrated that calpain-2 overexpression significantly improved heatstroke-induced decreases in ventricular end-diastolic volume and cardiac output. In conclusion, our study suggests that heat stress reduces calpain-2 expression, which then activates p38, leading to cardiomyocyte apoptosis and heart dysfunction.
Collapse
Affiliation(s)
- Zhi-Feng Liu
- Department of Critical Care Medicine, General Hospital of Guangzhou Military Command, Guangzhou, China.,Department of Medicine, Critical Illness Research Center, Lawson Health Research Institute, University of Western Ontario, London, Ontario, Canada.,Department of Pathology, Critical Illness Research Center, Lawson Health Research Institute, University of Western Ontario, London, Ontario, Canada
| | - Jing-Jing Ji
- Department of Critical Care Medicine, General Hospital of Guangzhou Military Command, Guangzhou, China.,Departement of Pathophysiology, Southern Medical University, Guangzhou, China
| | - Dong Zheng
- Department of Medicine, Critical Illness Research Center, Lawson Health Research Institute, University of Western Ontario, London, Ontario, Canada.,Department of Pathology, Critical Illness Research Center, Lawson Health Research Institute, University of Western Ontario, London, Ontario, Canada
| | - Lei Su
- Department of Critical Care Medicine, General Hospital of Guangzhou Military Command, Guangzhou, China.,Key Laboratory of Hot Zone Trauma Care and Tissue Repair of PLA, General Hospital of Guangzhou Military Command, Guangzhou, China
| | - Tianqing Peng
- Department of Medicine, Critical Illness Research Center, Lawson Health Research Institute, University of Western Ontario, London, Ontario, Canada.,Department of Pathology, Critical Illness Research Center, Lawson Health Research Institute, University of Western Ontario, London, Ontario, Canada
| |
Collapse
|
3
|
Wang P, Wang ZY. Metal ions influx is a double edged sword for the pathogenesis of Alzheimer's disease. Ageing Res Rev 2017; 35:265-290. [PMID: 27829171 DOI: 10.1016/j.arr.2016.10.003] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Revised: 09/08/2016] [Accepted: 10/17/2016] [Indexed: 12/17/2022]
Abstract
Alzheimer's disease (AD) is a common form of dementia in aged people, which is defined by two pathological characteristics: β-amyloid protein (Aβ) deposition and tau hyperphosphorylation. Although the mechanisms of AD development are still being debated, a series of evidence supports the idea that metals, such as copper, iron, zinc, magnesium and aluminium, are involved in the pathogenesis of the disease. In particular, the processes of Aβ deposition in senile plaques (SP) and the inclusion of phosphorylated tau in neurofibrillary tangles (NFTs) are markedly influenced by alterations in the homeostasis of the aforementioned metal ions. Moreover, the mechanisms of oxidative stress, synaptic plasticity, neurotoxicity, autophagy and apoptosis mediate the effects of metal ions-induced the aggregation state of Aβ and phosphorylated tau on AD development. More importantly, imbalance of these mechanisms finally caused cognitive decline in different experiment models. Collectively, reconstructing the signaling network that regulates AD progression by metal ions may provide novel insights for developing chelators specific for metal ions to combat AD.
Collapse
Affiliation(s)
- Pu Wang
- College of Life and Health Sciences, Northeastern University, No. 3-11, Wenhua Road, Shenyang, 110819, PR China.
| | - Zhan-You Wang
- College of Life and Health Sciences, Northeastern University, No. 3-11, Wenhua Road, Shenyang, 110819, PR China.
| |
Collapse
|
4
|
Skripchenko A, Turgeon A, Thompson-Montgomery D, Awatefe H, Wagner SJ. Value of calcium and phosphate in a bicarbonate-containing platelet additive solution with low plasma levels in maintaining key in vitro platelet storage parameters. Transfusion 2016; 57:349-356. [PMID: 27859382 DOI: 10.1111/trf.13894] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 09/12/2016] [Accepted: 09/13/2016] [Indexed: 12/16/2022]
Abstract
BACKGROUND Use of recently developed platelet (PLT) additive solutions (PAS) with 5% plasma levels may reduce the frequency and/or severity of transfusion reactions attributed to plasma. PLTs suspended in bicarbonate-containing PAS-5 with 5% plasma levels can maintain key PLT parameters during 7-day storage. This study evaluates the role of calcium and phosphate, as constituents of PAS-5, in maintaining PLT parameters. STUDY DESIGN AND METHODS An Amicus apheresis PLT unit (n = 13) was equally divided into four 60-mL aliquots in CF-250 polyolefin bags. Four different formulations of PAS-5 were prepared: PAS-5, PAS-5 without phosphate (-PO4 ), PAS-5 without calcium (-Ca), and PAS-5 without Ca and phosphate (-Ca/-PO4 ). PLTs were centrifuged, and the supernatant was expressed and replaced with the respective PAS, yielding PLTs suspended in 95% PAS and 5% plasma. PLTs were stored at 20 to 24ºC with agitation for 7 days. PLT in vitro parameters were evaluated on Days 1, 5, and 7. RESULTS In PLT PAS-5 aliquots, pH levels were maintained better compared with those in -Ca and -Ca/-PO4 aliquots. Glycolysis was greater in -Ca and -Ca/-PO4 PLT aliquots compared with PAS-5 aliquots. Hypotonic stress response and morphology were less and p-selectin (CD62P) binding was greater in -Ca/-PO4 PLT aliquots. The accumulation of reactive oxygen species was greater in -Ca/-PO4 PLTs. Phosphorylation of p38 mitogen-activated protein kinase (MAPK) was greater in -Ca and -Ca/-PO4 PLT aliquots during storage. CONCLUSION The removal of calcium and phosphate from PAS-5 leads to the activation of p38 MAPK and deterioration of key PLT storage parameters.
Collapse
Affiliation(s)
- Andrey Skripchenko
- American Red Cross Biomedical Services, Holland Laboratory, Rockville, Maryland
| | - Annette Turgeon
- American Red Cross Biomedical Services, Holland Laboratory, Rockville, Maryland
| | | | - Helen Awatefe
- American Red Cross Biomedical Services, Holland Laboratory, Rockville, Maryland
| | - Stephen J Wagner
- American Red Cross Biomedical Services, Holland Laboratory, Rockville, Maryland
| |
Collapse
|