Comparative Effects of Moringa oleifera Extract, Quercetin, Kaempferol, and Quercetin-Kaempferol Combination on Liver Fibrosis Regression in a Rat Model

Liver fibrosis — the buildup of scar tissue in the liver — can progress to cirrhosis if left unchecked. Researchers tested whether moringa leaf extract and two of its key flavonoids (quercetin and kaempferol) could reverse established liver fibrosis in rats, and whether a molecular marker called miR-29b could explain how. Flavonoids are plant-based compounds with antioxidant and anti-inflammatory properties; miR-29b is a small RNA molecule known to suppress the genes that drive scar tissue formation in the liver. Using a well-established rat model where liver fibrosis was chemically induced over 11 weeks with carbon tetrachloride (CCl4), the team then gave different groups of rats six weeks of treatment with moringa extract, quercetin alone, kaempferol alone, or a quercetin-kaempferol combination. Fibrosis severity was graded using the METAVIR scoring system — a standard clinical scale — and liver tissue was examined under a microscope. Blood enzyme levels (AST and ALT, markers of liver damage) and miR-29b gene expression were also measured. Both moringa extract and kaempferol alone produced statistically significant reductions in fibrosis severity compared to untreated animals. Interestingly, quercetin alone and the quercetin-kaempferol combination did not show the same clear benefit on fibrosis scores. miR-29b expression was significantly elevated in the moringa, kaempferol, quercetin-kaempferol combination, and even the placebo groups — a finding that complicates straightforward interpretation. The results suggest kaempferol may be a particularly active antifibrotic component within moringa, though the mechanisms and optimal dosing require further investigation before any clinical conclusions can be drawn.