The differential effects of green tea on dose-dependent doxorubicin toxicity

Area of Science:

• Pharmacology and Toxicology
• Natural Product Chemistry
• Cardiovascular and Hepatic Medicine

Background:

• Doxorubicin (DOX), a potent anticancer agent, induces cardiotoxicity and hepatotoxicity primarily through oxidative stress.
• Green tea (GT) possesses antioxidant properties and has shown protective effects against oxidative stress-related conditions.

Purpose of the Study:

• To investigate the protective potential of green tea extract against doxorubicin-induced oxidative stress.
• To evaluate the effects of green tea on doxorubicin-induced cardiac and hepatic morphological and metabolic alterations.

Main Methods:

• Male Wistar rats were administered doxorubicin (1.0 or 2.0 mg/kg b.w.) intraperitoneally for 7 weeks.
• Concomitant administration of green tea extract in drinking water was performed.
• Biochemical parameters, including blood fatty acid-binding protein, brain natriuretic peptide, and superoxide dismutase, were assessed.

Main Results:

• Green tea extract demonstrated significant protective effects on specific biomarkers, including blood fatty acid-binding protein, brain natriuretic peptide, and superoxide dismutase, against doxorubicin-induced changes.
• Multidirectional effects of green tea were observed on doxorubicin-altered blood metabolic parameters.
• Oxidative stress induced by doxorubicin was inhibited by green tea in the heart but not in the liver.

Conclusions:

• Green tea extract mitigated doxorubicin-induced general toxicity and histopathological damage in the heart and liver, particularly at a higher doxorubicin dose.
• The protective efficacy of green tea against doxorubicin toxicity was dose-dependent and organ-specific.
• Further research is warranted to elucidate the precise mechanisms underlying green tea's protective effects and its clinical applicability.