Red Orange: Experimental Models and Epidemiological Evidence of Its Benefits on Human Health
Table 3
Name, effect, and mechanisms of action of main components of red orange.
Food components
Effect
Mechanisms of action
Flavonoid
Anti-inflammatory
Modulate apoB secretion and cellular cholesterol; help cholesterol levels by raising HDL and lowering LDL cholesterol
Antioxidant
Stimulate endothelial NO synthase; normalize lipid peroxidation markers
Antiaggregation
Inhibit TxA2-mediated responses and dense granule secretion
Anticarcinogenic
Promote apoptosis in human pre-B NALM-6 cells and colon cancer cells; inhibit HIF-1α and VEGF expression in ovarian cancer and in lung cancer
Antiproliferative
Inhibit the COX-2 and MMPs in lung, prostate, and hepatocellular carcinoma cells; inhibited the proliferation of MCF-7 human breast cancer cells and testosterone-induced proliferation of LNCaP cells; inhibit lung colonization by melanoma and sarcoma cell line; inhibit formation of new blood vessels in human breast cancer cells
Anthocyanins
Antioxidant
Protect biomembranes from peroxidation by trapping peroxyl radicals in the cytosol; chelate metal ions like Cu2; ability in chelating metal ions like Cu2; form an ascorbic acid metal-anthocyanin complex (copigment)
Antimutagenicity
Form a cyanidin-DNA copigmentation complex; inhibit the reverse mutation induced by heterocyclic amines in microsomal activation systems
Growth inhibition
Inhibit the tyrosine kinase activity of the EGFR and the activation of the GAL4-Elk-1 fusion protein
Carotenoids
Antioxidant
React with singlet molecular oxygen and peroxyl radicals
Vitamin C
Blow-flow increase
Enhance generation of NO; reduce nitrite; stabilize atherosclerotic plaques (due to effect on collagen synthesis)
Antioxidant
Reduce the affinity of LDL-bound apoB protein for transition metal ions; quench aqueous ROS and RNS, decreasing their bioavailability in the plasma; reduce potentially damaging ROS, forming resonance-stabilized and relatively stable ascorbate free radicals; attenuate LDL-oxidation and protection of human vascular smooth muscle cells against apoptosis
Hydroxycinnamic acids
Antioxidant
Effect on phase II detoxification cascade; inhibit of superoxide dismutase and catalase; suppress of PG synthesis and cyclooxygenase-2
Anticarcinogenic
Prevent the tumor onset and protect the biochemical and molecular abnormalities in mammary, buccal pouch, colon, and skin cancers