自動化酶反應新方法建立并應用于待測化合物對CYP酶的抑制情況研究
[Abstract]:Cytochrome P450 proteins,CYPs (Cytochrome P450 proteins,CYPs) is a kind of mixed functional oxidase and heme enzyme system, which widely exists in animals, plants and microorganisms, and is involved in the metabolism of various chemicals, including drugs, pesticides, carcinogens, herbicides, and herbicides. Food additives and other types of compounds. CYPs is reported to be involved in more than 90% of drug metabolic reactions [1]. However, when compounds inhibit their activity, it may lead to the inhibition of metabolism of other compounds, resulting in drug interactions, 96% of which are mediated by CYPs. Drug interactions due to inhibition account for 70% of metabolic drug interactions [1]. In the process of new drug development, it is important to determine the specific CYPs subtypes responsible for the metabolism of each candidate drug and whether the candidate drug may inhibit or induce CYPs. (probe substrate) reaction model using human liver microsomes and probe substrates in vitro is one of the most commonly used methods to evaluate the effect of drugs on CYPs in (HLM) of mixed human hepatic microsomes. All along, the model has been incubated with artificial glass tubes. Limited by the operator's scientific research experience and operating standard, proficiency and even emotional changes, the artificial glass tube incubation method has some defects in precision, and the artificial glass incubation method is difficult to achieve high-throughput research. In this study, an automatic miniaturization platform was established based on Tecan RSP 100 / 8 Genesis series liquid processing workstation and IKA KS 130 small oscillatory shaking bed to evaluate the inhibition of candidate drugs to CYPs. Optimization of reaction conditions, the use of 96 hole plate for full automatic incubation operation, all reagents are transferred through the needle of the Tecan liquid treatment workstation to the designated hole position of the 96 hole plate. The workstation can handle the dilution process of a large quantity of reagents and compounds. At the same time, oscillating shaking table provides the necessary constant temperature and oscillating environment for enzyme reaction. After the reaction was terminated, a rapid LC-MS/MS analysis method was established for the analysis of metabolites. In this study, two sets of automated incubation procedures were established. One set was used to perform a preliminary evaluation of the inhibition of multiple CYPs by a single concentration of multiple compounds. Another set of users simultaneously performed multiple concentrations of multiple compounds to evaluate the inhibition of a single CYP, which can be used to calculate the half inhibitor dose (IC50). Setting up a preliminary evaluation program for the former can help to determine whether there is a need for a complete IC50 calculation operation. Each CYPs was added with its specific positive reference inhibitors, and the IC50 value of the positive reference inhibitors was calculated. The results were all within the scope of references, which to some extent proved the correctness of the system. Finally, the inhibitory effects of four main components of rhubarb on CYPs were studied by using this automatic system. The results showed that rhubarb phenols had a strong inhibitory effect on 2E1, Rhein on 2C19O2E1, emodin on 2C8C19 and aloe emodin on 2B6O2C19. In this study, the IC50 values of three major CYPs subtypes 3A4 / 5D6D6D2C9 were determined. The inhibitory IC50 value of emodin on 3A4/5 was 15.82 mol/L,12.68 mol/L;. The IC50 value of emodin on 3A4/5 was 18.40 mol/L;. The IC50 value of Rhein to 2C9 is 24.17 mol/L,. The IC50 value of other groups is more than 25.00 mol/L.. In the further development of the medicinal value of rhubarb, the possible drug interaction or the risk of food and drug interaction caused by the compatibility of traditional Chinese medicine were provided.
【學位授予單位】:華南理工大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:Q559.9;R96
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