Résumé
Aim To explore changes of gut microbiota in experimental model rats with hyperuricemia-induced mild cognitive impairment. Methods The experimental rats were provided with a diet containing 2% W/W uric acid (UA) and 2% W/W oxonic acid for period ranging from 1 day to 12 weeks. Morris water maze, blood biochemical indexes and other auxiliary models were used to evaluate the experimental animal model. Changes of gut microbiota were studied by 16S rDNA high-throughput sequencing. Results Compared with control group, the amount of UA of rats was significantly elevated. In addition, the rats showed significantly reduced spatial learning and memory in an escape latency and probe trial. The diversity of gut microbiota in model rats changed, and the relative abundances of 14 species of gut microbiota changed markedly. The abundance of Butyrivibrio, Erysipelotrichia, Erysipelotrichales, Erysipelotrichaceae, Erysipelatoclostridium, Lachnoclostridium 5, Anaeroplasmatales, Anaeroplasmataceae and Anaeroplasma in model mice increased, while that of Dorea, RuminococcaceaeUCG_005, Butyricicoccus, Tyzzerella 3 and Parasutterella decreased. Conclusions The continuous increase of UA can regulate gut microbiota, and the imbalance of gut microbiota is closely related to the development of mild cognitive impairment, which may be one of the mechanisms of hyperuricemia-induced mild cognitive impairment.
Résumé
To establish a method for determining the contents of six alkaloids (jatrorrhizine hydrochloride, columbamine hydrochloride, epiberberine hydrochloride, coptisine hydrochloride, palmatine hydrochloride, berberine hydrochloride) in six types of Coptidis Rhizoma pieces (crude pieces, ginger juice stir-fried pieces, vinegar stir-fried pieces, wine steamed pieces, wine stir-fried pieces, evodiae juice stir-fried pieces) by RP-HPLC, and explore the relationship with the curative effect of traditional Chinese medicine (TCM) and pharmacodynamics results. The chromatographic column was Welch XtimateTM C₁₈ (4.6 mm×250 mm, 5 μm), with 0.1% triethylamine solution (adjust pH at 10 with ammonium bicarbonate and ammonia) as mobile phase A and acetonitrile as mobile phase B for gradient elution (0-15 min, 10%-25%B; 15-25 min, 25%-30%B; 25-40 min, 30%-45%B) at a rate of 1.0 mL•min⁻¹. The column temperature was set at 30 ℃, and the wavelength was set at 270 nm. The six alkaloids showed a good linear relationship within the range of 0.85-16.96 mg•L⁻¹ (r=0.999 7), 1.25-24.96 mg•L⁻¹ (r=0.999 9), 2.05-40.96 mg•L⁻¹ (r=0.999 9), 3.65-72.96 mg•L⁻¹ (r=0.999 9), 2.88-57.60 mg•L⁻¹ (r=0.999 8), and 13.25-264.96 mg•L⁻¹ (r=0.999 6) respectively. The average recoveries (n=9) of the six alkaloids were 102.4% (RSD 1.2%), 101.8% (RSD 1.3%), 100.3% (RSD 1.8%), 100.7%(RSD 1.8%), 101.2% (RSD 1.5%) and 97.90% (RSD 2.0%) respectively, and their average contents were 3.55, 4.49, 9.12, 19.17, 15.69, 62.56 mg•g⁻¹, respectively. This determination method was accurate and repeatable, which could be used for the content determination in six types of Coptidis Rhizoma pieces. Data analysis on contents determination and preliminary pharmacodynamics results was conducted by using principal component analysis (PCA) and hierarchical clustering analysis (HCA). The analysis results showed that three types of Coptidis Rhizoma pieces (wine steamed pieces, wine stir-fried pieces, and evodiae juice stir-fried pieces) had significant differences with crude pieces, and the wine steamed Coptidis Rhizoma pieces showed most difference with crude pieces especially, mainly related to triglyceride (TG) and fasting blood glucose levels (FBG) in serum. In addition, columbamine hydrochloride was most affected among the six alkaloids. Those three types of Coptidis Rhizoma pieces (wine steamed pieces, wine stir-fried pieces, and evodiae juice stir-fried pieces), had more advantages for "anti-diabetes" in TCM clinical application, especially in the treatment of diabetic hyperlipidemia.
Résumé
In present study, cholesterol/high fat diet-induced atherosclerotic quails were used to evaluate the effects of combination of Puerariae Lobatae Radix and Salviae Miltiorrhizae Radix et Rhizoma (1: 1, abbreviated as PRSM) on lipid metabolism, liver index, apolipoprotein levels. The results obtained from this study indicated that oral administration of ethyl acetate extract of PRSM at doses of 7.5, 5.0, 2.5 g x kg(-1) as well as aqueous extract of PRSM at dose of 7.5 g x kg(-1) could reduce the serum cholesterol (TC), triglycerides (TG), low density lipoprotein cholesterol (LDL-C) and very low density lipoprotein cholesterol (VLDL-C) levels as well as the weight of liver and liver index, and increase the serum level of high density lipoprotein cholesterol (HDL-C). Furthermore, reduced levels of apolipoprotein B (ApoB) and elevated levels of apolipoprotein A1 (ApoA1) were observed in ethyl acetate extract and aqueous extract of PRSM treated atherosclerotic quails. All results demonstrate that PRSM possess a regulatory role on lipid metabolism disorders in atherosclerotic quails, which may be the pharmacological basis of PRSM for preventing the development of atherosclerosis.