Comparative effects of Helmar-1 and Helmar-2 polyphenol extracts on mitochondrial bioenergetics, antioxidant defense, and lipid peroxidation in CCl₄-induced toxic hepatitis in rats.

内容摘要

Toxic hepatitis is characterized by enhanced oxidative stress and disruption of antioxidant defense mechanisms in the liver mitochondria. In this study, we investigated the effects of polyphenolic extracts (Helmar-1 and Helmar-2) obtained from Helichrysum maracandicum on mitochondrial antioxidant systems in rats with experimentally induced toxic hepatitis. Experimental toxic hepatitis was established in rats through intraperitoneal administration of carbon tetrachloride (CCl₄) diluted in olive oil (50%, 1 mL/kg), administered twice weekly over a two-week period. Liver injury was verified by elevated plasma levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST). The animals were subsequently treated with Helmar-1 and Helmar-2 extracts at a dose of 20 mg/kg per day for 10 consecutive days. The activities of key antioxidant enzymes (superoxide dismutase, catalase, and glutathione peroxidase), malondialdehyde (MDA) content, and mitochondrial respiration and oxidative phosphorylation parameters (V₂, V₃, V₄, RCR, and ADP/O ratio) were assessed in liver mitochondria. Treatment with both Helmar-1 and Helmar-2 extracts resulted in a significant enhancement of antioxidant enzyme activities, a marked reduction in MDA levels, and substantial improvement in mitochondrial respiration and oxidative phosphorylation parameters compared to untreated toxic hepatitis groups. Overall, these results confirm that Helichrysum maracandicum polyphenol extracts improve mitochondrial respiration, oxidative phosphorylation efficiency, antioxidant defense, and membrane stability in toxic hepatitis.