Background:
Naringenin is the predominant flavanone in grapefruit; displays strong anti-inflammatory and antioxidant activities.
Naringenin is shown to inhibit the proliferation of HepG2 cells resulted partly from an accumulation of cells in the G0/G1 and G2/M phase of the cell cycle. Naringenin has been shown to induce apoptosis as evidenced by nuclei damage and increased proportion of apoptotic cells. Naringenin triggers the mitochondrial-mediated apoptosis pathway as shown by an increased ratio of Bax/Bcl-2, subsequent release of cytochrome C, and sequential activation of caspase-3[1]. Naringenin exposure significantly reduces the cell viability of A431 cells with a concomitant increase in nuclear condensation and DNA fragmentation in a dose dependent manner. Cell cycle study shows that naringenin induced cell cycle arrest in G0/G1 phase of cell cycle and caspase-3 analysis reveal a dose dependent increment in caspase-3 activity which leads to cell apoptosis[2].
Naringenin supplementation causes a significant reduction in the amount of total triglyceride and cholesterol in plasma and liver. In addition, naringenin supplementation lowers adiposity and triglyceride contents in parametrial adipose tissue. Naringenin-fed animals show a significant increase in PPARα protein expression in the liver. The expression of CPT-1 and UCP2, known to be regulated by PPARα, is markedly enhanced by naringenin treatment[3]. Naringenin increases hepatic fatty acid oxidation through a PPARγ coactivator 1α/PPARα-mediated transcription program. It prevents sterol regulatory element-binding protein 1c–mediated lipogenesis in both liver and muscle by reducing fasting hyperinsulinemia. Naringenin decreases hepatic cholesterol and cholesterol ester synthesis[4]. Naringenin inhibits TNF-α-induced VSMC proliferation and migration in a dose-dependent manner. Mechanistic study demonstrates that naringenin prevents ERK/MAPK and Akt phosphorylation while left p38 MAPK and JNK unchanged. Naringenin also blocks the increase of ROS generation induced by TNF-α[5].
参考文献:
[1]. Arul D, et al. Naringenin (citrus flavonone) induces growth inhibition, cell cycle arrest and apoptosis in human hepatocellular carcinoma cells. Pathol Oncol Res. 2013 Oct;19(4):763-70.
[2]. Ahamad MS, et al. Induction of apoptosis and antiproliferative activity of naringenin in human epidermoid carcinomacell through ROS generation and cell cycle arrest. PLoS One. 2014 Oct 16;9(10):e110003.
[3]. Cho KW, et al. Dietary naringenin increases hepatic peroxisome proliferators-activated receptor α proteinexpression and decreases plasma triglyceride and adiposity in rats. Eur J Nutr. 2011 Mar;50(2):81-8.
[4]. Mulvihill EE, et al. Naringenin prevents dyslipidemia, apolipoprotein B overproduction, and hyperinsulinemia in LDLreceptor-null mice with diet-induced insulin resistance. Diabetes. 2009 Oct;58(10):2198-210.
[5]. Chen S, et al. Naringenin inhibits TNF-α induced VSMC proliferation and migration via induction of HO-1. Food Chem Toxicol. 2012 Sep;50(9):3025-31.
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