Procyanidins From Japanese Quince (Chaenomeles Japonica) Fruit Induce Apoptosis in Human Colon Cancer Caco-2 Cells in a Degree of Polymerization-Dependent Manner.

FLAVONOIDS; MEDICAL botany; DNA; ANALYSIS of variance; APOPTOSIS; CELL culture; CELL cycle; COLON tumors; FRUIT; NUTRITION; STATISTICS; TUMORS; DATA analysis; DATA analysis software; PHYSIOLOGY; THERAPEUTICS

Plant proanthocyanidins, including procyanidins, display various biological activities. Here we report an inhibition of human colon cancer Caco-2 cell growth by the extract from Japanese quince fruit and the procyanidin-rich fractions of the extract. We observed that the amount of apoptotic Caco-2 cells increased by 52.1% vs. control after 72-h incubation with 50 μg extract/mL, as assessed by flow cytometry and image cytometry. Under the same experimental conditions the corresponding values for human colon cancer HT-29 cells and for rat normal intestinal IEC-6 cells were 5.0% and 8.1%, respectively. The extract fractions enriched with higher oligomers exhibited the highest proapoptotic activity. In conclusion, the Japanese quince procyanidins exhibited proapoptotic activity in Caco-2 cells within a submilimolar concentration range. [ABSTRACT FROM PUBLISHER]

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