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• W2017688663 abstract "Cocaine-related deaths are continuously rising and its overdose is often associated with lethal cardiotoxic effects. Our approach, employing isothermal titration calorimetry (ITC) and light scattering in parallel, has confirmed the significant affinity of human cardiac calsequestrin (CASQ2) for cocaine. Calsequestrin (CASQ) is a major Ca2+-storage protein within the sarcoplasmic reticulum (SR) of both cardiac and skeletal muscles. CASQ acts as a Ca2+ buffer and Ca2+-channel regulator through its unique Ca2+-dependent oligomerization. Equilibrium dialysis and atomic absorption spectroscopy experiments illustrated the perturbational effect of cocaine on CASQ2 polymerization, resulting in substantial reduction of its Ca2+-binding capacity. We also confirmed the accumulation of cocaine in rat heart tissue and the substantial effects cocaine has on cultured C2C12 cells. The same experiments were performed with methamphetamine as a control, which displayed neither affinity for CASQ2 nor any significant effects on its function. Since cocaine did not have any direct effect on the Ca2+-release channel judging from our single channel recordings, these studies provide new insights into how cocaine may interfere with the normal E-C coupling mechanism with lethal arrhythmogenic consequences. We propose that cocaine accumulates in SR through its affinity for CASQ2 and affects both SR Ca2+ storage and release by altering the normal CASQ2 Ca2+-dependent polymerization. By this mechanism, cocaine use could produce serious cardiac problems, especially in people who have genetically-impaired CASQ2, defects in other E–C coupling components, or compromised cocaine metabolism and clearance." @default.
• W2017688663 created "2016-06-24" @default.
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• W2017688663 date "2013-12-01" @default.
• W2017688663 modified "2023-09-26" @default.
• W2017688663 title "Potential role of cardiac calsequestrin in the lethal arrhythmic effects of cocaine" @default.
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• W2017688663 doi "https://doi.org/10.1016/j.drugalcdep.2013.06.012" @default.
• W2017688663 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4097383" @default.
• W2017688663 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23876860" @default.
• W2017688663 hasPublicationYear "2013" @default.
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