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Effect of cocaine on cardiac biochemical functions
Abstract:
The role of cocaine in cardiac ischemia and subsequent reversible and irreversible pathologic changes is well established. Nevertheless, the mechanisms leading to cardiac injury and irreversible cellular changes remain elusive. Reactive oxygen species (ROSs) are the critical mediators of cellular damage during ischemia-reperfusion. To explore the response of cardiac oxidative stress parameters to intravenous (i.v.) And intraperitoneal (i.p.) cocaine exposure, cardiac total glutathione (GSH, GSSG), malonaldialdehyde (MDA), Mn-superoxide dismutase (Mn-SOD), catalase (CAT), GSH-peroxidase (GSH-px), and GSH s-transferase (GST) were measured, along with biochemical and histologic markers indicative of cardiac injury. Repeated i.p. cocaine exposure produced significant impairment in cardiac integrity, demonstrated by increased circulating lactate (2.4-fold; p < 0.0001), creatine kinase (2.2-fold; p < 0.0001), and creatinine levels (1.7-fold; p < 0.0001). Infiltration of neutrophils into myocardial cavities also was evident. These changes paralleled increases in cardiac MDA (25%; p < 0.04), GSSG (55%; p < 0.001), protein carbonyls (23%; p < 0.05), and Mn-SOD (23%; p < 0.05) levels, indicative of oxidative stress, decreases in GSH (35%; p < 0.01), adenosine triphosphate (ATP; 26%; p < 0.04), GSH-px (28%; p < 0.03), CAT (32%; p < 0.01), and GST (50%; p < 0.001) levels. Intravenous cocaine administration also had similar effects on cardiac oxidative stress measures. In conclusion, our data indicate that cocaine administration compromised the heart's antioxidant defense system.
Insights
Cocaine exposure damages the heart by increasing oxidative stress and impairing antioxidant defenses. This study reveals how cocaine affects cardiac glutathione, malondialdehyde, and other key markers, leading to cellular injury.
Area of Science:
- Cardiology
- Biochemistry
- Toxicology
Background:
- Cocaine's detrimental effects on cardiac health are known, but the precise mechanisms of injury remain unclear.
- Reactive oxygen species (ROSs) are implicated as key mediators in ischemia-reperfusion-induced cellular damage.
- Understanding cocaine's impact on cardiac oxidative stress is crucial for developing protective strategies.
Purpose of the Study:
- To investigate the effects of intravenous (i.v.) and intraperitoneal (i.p.) cocaine exposure on cardiac oxidative stress parameters.
- To assess biochemical and histological markers of cardiac injury following cocaine administration.
- To elucidate the mechanisms by which cocaine compromises the heart's antioxidant defense system.
Main Methods:
- Measurement of cardiac glutathione (GSH, GSSG), malondialdehyde (MDA), Mn-superoxide dismutase (Mn-SOD), catalase (CAT), GSH-peroxidase (GSH-px), and GSH s-transferase (GST).
- Analysis of circulating lactate, creatine kinase, and creatinine levels as indicators of cardiac injury.
- Histological examination for neutrophil infiltration in myocardial tissues.
Main Results:
- Repeated i.p. cocaine administration significantly elevated cardiac MDA, GSSG, protein carbonyls, and Mn-SOD, indicating increased oxidative stress.
- Cocaine exposure led to decreased levels of cardiac GSH, adenosine triphosphate (ATP), GSH-px, CAT, and GST, signifying compromised antioxidant capacity.
- Both i.v. and i.p. cocaine administration induced similar detrimental effects on cardiac oxidative stress markers and injury indicators.
Conclusions:
- Cocaine administration significantly compromises the heart's antioxidant defense system.
- The study provides evidence that cocaine-induced cardiac injury is mediated by oxidative stress.
- These findings highlight the urgent need for therapeutic interventions to mitigate cocaine-related cardiotoxicity.