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• W1993480280 abstract "It is now well documented that both cocaine (Coc) and methamphetamine (Meth) are independently capable of inducing injurious effects on the adult and developing myocardium. In addition, when these drugs are used concomitantly such as in polydrug abuse, it has been suggested that they may cause synergistic adverse effects on the myocardium. In this investigation, primary myocardial cell cultures were established from 3-5-day-old Sprague-Dawley rats to describe the adverse effects of Coc and Meth on the myocardium. After the cells were in culture for 4 days, they were exposed to 1 x 10(-5) and 1 x 10(-3) M Coc alone; 1 x 10(-5) and 1 x 10(-3) M Meth alone; and combinations of 1 x 10(-3) M Coc with 1 x 10(-5) M Meth and 1 x 10(-5) M Coc with 1 x 10(-5) M Meth. Lactate dehydrogenase (LDH) release, morphology, and beating activity were evaluated after exposure to the drugs for 1, 4 and 24 h. With all treatment groups for the first 4 h, LDH release was not significantly different from untreated controls. Significant LDH release (P less than 0.001) was exhibited at 24 h with 1 x 10(-3) M Coc alone, 1 x 10(-3) M Meth alone, and 1 x 10(-3) M Coc with 1 x 10(-5) M Meth. For 24 h of treatment, cellular injury (pseudopodia, vacuolization, granulation) induced by 1 x 10(-3) M and 1 x 10(-5) M Coc alone was extensive and minimal, respectively. When 1 x 10(-5) M Meth was added with 1 x 10(-5) M Coc, pseudopodia formation was extensive. No measurable beating activity was observed at 1, 4 and 24 h exposure to 1 x 10(-3) M Coc alone and 1 x 10(-3) M Coc with 1 x 10(-5) M Meth. At 1 h, beating activity after treatment with 1 x 10(-5) M Coc alone and 1 x 10(-5) M Meth alone was not significantly different from untreated controls; however, the percentage of areas exhibiting contractile activity was depressed. Addition of Meth (1 x 10(-5) M) potentiated Coc-induced (1 x 10(-5) M) depression of contractile activity at all 3 time-points. These data suggest that Coc and Meth may interact synergistically at the cellular level to directly potentiate injury to postnatal myocardial cell cultures." @default.
• W1993480280 created "2016-06-24" @default.
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• W1993480280 date "1992-04-01" @default.
• W1993480280 modified "2023-09-23" @default.
• W1993480280 title "A primary culture system of postnatal rat heart cells for the study of cocaine and methamphetamine toxicity" @default.
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• W1993480280 doi "https://doi.org/10.1016/0378-4274(92)90273-m" @default.
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