基于機(jī)器學(xué)習(xí)的天然產(chǎn)物抗腫瘤和免疫調(diào)節(jié)活性研究
[Abstract]:Natural products play an important role in cancer chemotherapy, immunomodulation, neuroprotection, regulation of energy metabolism, anti microbial and cardiovascular disease treatment. They are likely to provide us with the structure of many pilot compounds and can be used as a template for drug delivery in the prevention and treatment of various diseases. The anti-tumor activity of natural products and the immunomodulatory activity of three terpenoid saponins in natural products are studied. The prediction models are established by machine learning methods and the key chemical structures that can describe the corresponding bioactivity of natural products are found. The methods and results of this paper are based on natural products. The development and utilization of drugs, the treatment of disease, and the study of the structure-activity relationship of natural products. (1) the research method of natural product antitumor research methods usually can obtain some key structural properties, such as some chemical bonds or chemical groups. In the study of tumor activity, we usually first determine the effect of this structural feature on a single cancer type or cell line. In this article, we first developed a machine learning method to comprehensively predict the anti-tumor effects of natural products on a series of cancer cell lines. Here we use the base of the cancer cell line at the same time. The chemical structure features (chemical descriptors) of group information (gene expression) and natural products. When these machine learning models are applied to two datasets, training sets and independent test sets, these prediction models show very good prediction accuracy. In addition, we also prove that this method has two natural products, namely ginger. The ability to predict the antitumor activity of lutein and resveratrol, which indicates that the method can effectively predict the one-to-one correspondence between the two natural products and various cancer cell lines, and also linked the patient's genomic information to the sensitivity of natural products. In recent years, many natural products have been isolated and purified in the laboratory and have been proved to have some antitumor activity, such as camptothecin, Changchun anthraquinone, maxoquinone, paclitaxel and so on. Products have played a key role in the treatment of a variety of cancers such as melanoma, leukemia, and breast cancer. In addition, more and more new derivatives based on natural product structures have become antitumor candidates. However, it is extremely time-consuming and laborious to screen natural products by experimental methods. Methods to study its structure-activity relationship is a good choice. The traditional methods for studying structure-activity relationships are mostly chemical background researchers based on the basic skeleton of pilot compounds to synthesize a series of analogues and predict their anti-tumor activity according to experience. Using structural information to try to predict the inhibition of a single cancer cell line or a single tissue type. Although many results have been achieved, the problem is far from being well solved. In order to obtain a comprehensive analysis, we intend to use a new approach based on chemical structure and genomic information. A simultaneous detection of the sensitivity of several known cancer cell lines to hundreds of natural products. We first established a machine learning method to predict the response of cancer cell lines to natural products by using the gene expression data of the cancer cell lines and the chemical descriptors of the natural product structure. The experimental results of the training set and test set have proved that Our approach can be more satisfactory in predicting the sensitivity of hundreds of cancer cell lines. It also demonstrates the combination of structural features and gene expression characteristics, which has an important role in determining the antitumor activity of natural products, the project's prediction of drug reactions and the discovery of new natural sources. (2) study on the immunomodulatory activity of three terpene saponins, three terpenoid saponins are considered to be a series of bioactive compounds, which are produced by plants to impede the invasion of pathogenic bacteria and herbivorous animals. "Saponins" here refer to a class of glycosides with a glycoside ligand and a covalent binding of saponins. Natural compounds in one or more sugar parts. Most known three terpenoid saponins belong to the secondary metabolites of plant origin, although a few of the saponins are found in marine animals, such as sea cucumbers and starfish. The ability to synthesize three terpenoid saponins is widely distributed in plants of the quilt gate, whether dicotyledonous or single. Cotyledon. The study of three terpenoid saponins from natural sources has made considerable progress, usually based on their glycoside skeleton structure, such as oleanane type, uranane type, lupane type, lehpane type, ring bromelane type, calamane type, lanolin sterane type, damanane type, cucurbanane type and sea cucumber, and so on. Three terpenes. Biological and pharmacological activities of saponins have recently been confirmed in many studies, such as antiallergic reaction, anti atherosclerosis, antithrombotic, antithrombotic, antidiabetic, antidiabetic, contraceptive, antifungal, anti inflammatory, anti Leishmania, antimalarial, anti obesity, anti proliferation, treatment of psoriasis, antispasm, antiviral, cytotoxicity, antitumor, detoxification, antidote, antidote, and gastric preservation. Protection, hemolysis, liver protection, immunomodulation, anti enzyme, anti osteoporosis, insecticide, insulin like, membrane porous, snail, neuroprotection, anti endothelial cell dysfunction and snake venom antidote and so on. Three terpenoid saponins are active components in some Chinese medicine and have higher pharmacological properties and are obtained in the field of drug development. Researchers have paid more and more attention. So a lot of work has been put into the study of the mechanism of three terpenoid saponins and their industrialization potential. Although the ability to produce three terpenoid saponins in widely distributed plants, the understanding of its structure-activity relationship is still not fully elucidated in any kind of plant. In our work, we focused on the study of the immunomodulatory activity of three terpenoid saponins and developed a prediction model using their chemical characteristics and machine learning algorithms. The data set required for the establishment of the model was manually retrieved from existing literature. The machine learning model was established for the first time to predict the immunomodulatory activity of three terpenoid saponins. The method in this study may be helpful to the research and understanding of the structure-activity relationship of three terpenoid saponins. The results in this study will help researchers to predict the activity of saponins and reveal the mechanism of their pharmacological effects.
【學(xué)位授予單位】:安徽大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:R96
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