Background: The incidence and mortality of hyperlipidemia are increasing year by year, showing a younger trend. At present, the treatment of hyperlipidemia is mainly dependent on western medicine, but its side effects on liver and kidney function are common in clinics. Therefore, it is necessary to study the treatment of hyperlipidemia by augmenting effective dietary nutrition supplements. Vitamin B6 (VitB6), as an essential cofactor for enzymes, participates in lipid metabolism. The effects of VitB6 on hyperlipidemia, however, have not been reported until now.
Aim: The present study was to investigate the influence of VitB6 on hepatic lipid metabolism in hyperlipidaemia rats induced by a High-Fat Diet (HFD).
Methods: Male Sprague-Dawley rats were kept on HFD for two weeks to establish the hyperlipidemia model. The rats in low-dosage and high-dosage groups were received 2.00 and 3.00 mg/kg/- day of VitB6 for eight weeks, respectively.
Results: The results showed that both doses of VitB6 reduced HFD-induced hepatic Low-Density Lipoprotein Cholesterol (LDL-C); decreased blood cholesterol (TC), triglycerides, LDL-C, atherogenic index (AI), Atherogenic Index of Plasma (AIP), apolipoprotein B (ApoB) and ApoB/apolipoprotein A-1(ApoA1) ratio; increased liver High-Density Lipoprotein Cholesterol (HDL-C) and serum ApoA1; reduced hepatic steatosis and triglyceride accumulation, lowered fat storage, and recovered heart/body and brain/body ratio to a normal level. In addition, VitB6 supplementation markedly decreased HMGR level, increased the mRNA abundance of LDLR and CYP7A1, and protein expression of SIRT1, following the downregulation of SREBP-1 and PPARγ protein expression in the liver of hyperlipidemia rats.
Conclusion: In summary, oral VitB6 supplementation can ameliorate HFD-induced hepatic lipid accumulation and dyslipidemia in SD rats by inhibiting fatty acid and cholesterol synthesis, promoting fatty acid decomposition and cholesterol transport.
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