ABSTRACT
Objective:The hypoglycemic effects and mechanisms of total flavonoids from Potentillae Discoloris Herba（TFE） on insulin resistance through the phosphatidylinositol-3 kinase （PI3K）/protein kinase B （Akt） signaling pathway in db/db mice were investigated. Method:The 24 db/db mice were randomly divided into four groups， model group， metformin group and TFE 100，400 mg·kg<sup>-1</sup> group respectively. The 6 db/m mice as normal control group. After 4 weeks treatment， the mice were processed and the levels of fasting blood glucose（FBG）， glycated serum protein（GSP），fasting blood insulin（FINS），triglyceride（TG）， total cholesterol（TC）， low density lipoprotein cholesterol （LDL-C），high density lipoprotein cholesterol （HDL-C） in serum were detected. Homeostatic model assessments of insulin resistance（HOMA-IR）were quantified. Hematoxylin-eosin（HE）staining of liver and pancreatic tissues were examined. The expression of IR<italic>β</italic>， IRS-1，PI3K，phosphorylation-PI3K （p-PI3K）， Akt， phosphorylation-Akt（p-Akt） and glucose transporter 4（GLUT4） in livers were assessed by Western blot. Result:Compared with normal group， model group showed liver and pancreas injury. FBG， GSP， TC， TG， LDL-C， FINS and MDA levels in serum were significantly increased （<italic>P</italic><0.01）， HDL-C and SOD levels in serum were significantly decreased （<italic>P</italic><0.05）， liver glycogen content was significantly decreased （<italic>P</italic><0.01）， as well as expression of IR， IRS-1， p-PI3K/PI3K， p-Akt/Akt and GLUT4 protein in liver tissues were significantly decreased （<italic>P</italic><0.01）. Compared with model group， TFE was able to relieve liver and pancreas injury，while the levels of FBG， GSP， TC， TG， FINS and MDA in serum were significantly decreased （<italic>P</italic><0.05）， HDL-C and SOD levels liver were significantly increased （<italic>P</italic><0.05）， liver glycogen content was significantly increased （<italic>P</italic><0.01）， and the expressions of IRS-1， p-PI3K/PI3K， p-Akt/Akt and GLUT4 protein in liver tissues were significantly up-regulated （<italic>P</italic><0.05）. Conclusion:These findings indicate that TFE has the potential to reduce blood sugar and alleviates insulin resistance through the PI3K/Akt signaling pathway in the livers of db/db mice.
ABSTRACT
The ethyl acetate fraction of 80% ethanol extract from Bidens parviflora Willd．was isolated and purified by silica, polyamide, Sephadex LH-20 and HPLC. A total of eleven compounds were isolated and identified by physicochemical properties and spectral data as (2S)-11E-tetradecene-3,5,7,9-tetrayne-1,2,13-triol (1), pyridine-4-formyl-O-β-D-glucopyranoside (2), maritimein (3), trichocarpine (4), okanin-4-methyl ether-3′-O-β-D-glucopyranoside (5), okanin-4-methyl ether-4′-O-β-D-(6″-acetyl)-glucopyranoside (6), (Z)-6-O-(4″-acetyl-6″-O-p-coumaroyl-β-D-glucopyranosyl)-6,7,3′,4′-tetrahydroxyaurone (7), quercetin-3-O-α-L-arabinoside (8), hyperoside (9), (3S)-(6E,12E)-tetradecadiene-8,10-diyne-1,14-diol-3-O-β-D-glucopyranoside (10), bipinnata polyacetyloside B (11). Compounds 1 and 2 are new compounds, compounds 4 and 8 were isolated from the genus Bidens for the first time, compounds 5-7, 10 and 11 were isolated from this plant for the first time.
ABSTRACT
Objective: To analyze the dynamic changes of components in the enzymolysis process of raw products of Raphani Semen. Method: HPLC was employed to analysis of characteristic spectra of Raphani Semen at different enzymolysis time with mobile phase of acetonitrile-0.1% phosphoric acid aqueous solution for gradient elution and detection wavelength at 225 nm.The characteristic peaks were calibrated, meanwhile, the UV spectra of characterstic peaks were extracted, and the difference between UV spectra and the changes of peak areas were compared, and the dynamic changes of characterstic components in Raphani Semen were analyzed. Result: Eleven characteristic peaks were marked from the characteric spectra of raw products of Raphani Semen at different enzymolysis time, and glucoraphenin and sinapine thiocyanate were assigned.Glucoraphenin was enzymatically hydrolyzed fastly by myrosinase, and an intermediate was generated, and then continue to be decomposed into other components.Sinapine thiocyanate did not change significantly during the enzymolysis process, and sinadiosides was also enzymatically degraded. Conclusion: The enzymolysis of Raphani Semen is not only the glucoraphenin, but also the sinadiosides.This paper can provide reference for the property change of Raphani Semen in processing.
ABSTRACT
In this paper, the lipidomics was used to analyze the changes to address how Uncaria interrupts lipid metabolism in the liver of spontaneously hypertensive rats, and to explore the mechanism of action of Uncaria. All the experiments were approved by the animal protection and use committee of Shandong University of Traditional Chinese Medicine. UHPLC-Q Extractive orbitrap high-resolution mass spectrometry was used to collect lipid metabolite information of the rat livers. Through pattern recognition, matters with noticeable differences were recognized. Mass spectrum and data base searching helped to identify the potential biomarkers. Pattern recognition results indicated that the rats from control versus SHR group showed clear differences. Compared with the rats from the control group, there are decreases in sphosphatidylcholine, phosphatidic acid, diacylglycerol and sphingomyelin in rats from the SHR group, however lysophosphatidylcholine, triglyceride, linoleic acid, arachidonic acid and ceramide are increased. Uncaria could regulate the disorder of lipid metabolism by interfering with glycerophospholipid, sphingolipid, linoleic acid, and arachidonic acid metabolic pathways. This study provided the mechanistic understanding of the impact of Uncaria on lipid metabolism and revealed the lipid metabolism pathways affected to offer the explanation for the complex mechanism of action.
ABSTRACT
OBJECTIVE@#To investigate the effects of Pinggan Prescription (, PGP) on hypertension by the associated methods of metabonomic and pharmacodynamic.@*METHODS@#A total of 32 male spontaneously hypertensive rats (SHRs) were randomly divided into two groups by using the random number table method: a treatment group (n=18) and a model group (n=14). The Wistar rats (n=14) were used as the normal group. Different prescription were used to intervene three groups: the treatment group in which PGP extract was administered orally at a dose of 18.336 g/kg (PGP/body weight), and the model group in which physiological saline was administered at the equivalent dose. The same treatment was applied to the normal group as the model group. The blood pressure was measured by tail-cuff method, and pharmacodynamic indexes including cyclic adenosine monophosphate (cAMP) and angiotensin II (Ang II) were tested by enzyme-linked immunosorbent assay. The plasma samples from three groups were detected by gas chromatography-mass spectrometry (GC-MS).@*RESULTS@#Compared with the model group, blood pressure of treatment group was obviously reduced after continuous curing with PGP (P<0.01). The pharmacodynamic results illustrated that the content of Ang II increased with the raised blood pressure and the cAMP expressed the converse trend. After curing with PGP, the content of Ang II decreased, the difference between model group and treatment group was significant (P<0.01), and the cAMP expressed the converse trend. Five potential biomarkers were identified, including arachidonic acid, hexadecanoic acid, elaidic acid, octadecanedioic acid and 9,12-octadecadienoic acid. These metabolites had shown significantly changes as followed: arachidonic acid, hexadecanoic acid and elaidic acid were significantly higher and octadecanedioic acid and 9,12-octadecadienoic acid were lowered in the model group than those in the normal group. After the treatment of PGP, the metabolites had the trends of returning to normal along with the reduced blood pressure.@*CONCLUSIONS@#PGP intervention for hypertension played a major role in the metabolism of arachidonic acid and linoleic acid. Metabonomic with pharmacodynamic methods could be potentially powerful tools to investigate the mechanism of Chinese medicine.