PLKs抑制劑ON 01910結(jié)構(gòu)類似物的設(shè)計、合成及初步抗腫瘤活性研究
[Abstract]:The abnormal expression of Plks (Polo-like kinase) is closely related to the occurrence and development of tumors. It has been proved that Plks are overexpressed in many kinds of tumor cells. Plks is a serine/threonine kinase expressed in dividing cells, which acts on mitosis and promotes cell proliferation. The content of Plks peaks in M phase of cell cycle. Plks has become an important target molecule for the treatment of malignant tumors due to its important role in cell proliferation and highly conserved structure. A series of Plks inhibitors have been found and their antitumor activities have been confirmed in a large number of studies in vivo and in vitro. ON01910 has been used as an effective Plks inhibitor. The pharmacokinetic properties of ON01910 are high plasma protein binding rate, rapid elimination, short half-life, and mainly in the liver at low doses. The dosage was given mainly through urine excretion. Some studies of tissue distribution showed that the drug accumulation in the liver was the highest, followed by the kidney. The main adverse reactions were mild hematotoxicity and liver injury, without severe myelosuppression, neuropathy or cardiotoxicity.
Based on the general strategy of me-too drug development, ON01910 was patented, and its structure-activity relationship was analyzed and summarized. Local structural modification was carried out to change the acidity and basicity of the drug, the distribution coefficient of lipids and water, the direction of metabolic transformation in vivo and prolong the action time. On the other hand, the introduction of hydroxamic acid groups into the formerly administered drugs can improve the ADME process of ON01910 in vivo and enhance its bioavailability. Moreover, the chelation of hydroxamic acid with metal ions can also be exerted, acting on HDAC, APN, MMP and other metalloproteinases, affecting multiple signaling pathways. Inhibition of tumor development. 4-methoxy-3-nitrotoluene was used as the starting material, NBS bromination, mercaptoacetic acid (TGA) nucleophilic substitution, 30% H2O2 oxidation, condensation with 2,4,6-trimethoxybenzaldehyde, nitroreduction and methyl bromoacetate (BAM) nucleophilic substitution to form (E) 2-(2-methoxy-5-((2,4,6-trimethoxystyrenesulfonyl) methyl) benzylamine) ethyl Methyl ester of acid (L6), methyl ester of carboxylic acid in L6 structure is hydrolyzed by NaOH to carboxylic acid (L7) or reacted with potassium hydroxylamine to introduce hydroxamic acid group (L8), at the same time L7 reacts with aminoethanol, lysine, arginine, choline, calcium hydroxide, magnesium hydroxide, potassium hydroxide and sodium hydroxide to form corresponding salts (L9-L16). Similar compounds with sulfonyl structure were identified by ESI-MS and 1H-NMR.
In addition to the study of ON01910 analogues, four a-lipoic acid derivatives were designed and synthesized on the basis of the principle of conjugation. Compounds I 2 and I 3 were synthesized from lipoic acid with optical activity. Compound II was synthesized by condensation of racemic alpha-lipoic acid with antitumor adjuvant tirazamine (TPZ). Inhibition of tumor cell proliferation activity provides new ideas for the design and synthesis of such compounds.
In the end, the antitumor activity of the target compounds was preliminarily studied. Firstly, L8, L21 and I 1, II showed moderate inhibitory activity to HDAC enzyme by fluorescence assay. Meanwhile, the antiproliferative activity of the target compounds to ES-2, K562, PC-3, MDA-MB-231, A549 and U937 cell lines was determined by MTT method. All of them had good cytotoxic activity, especially L7-8 and L21-22. The IC50 values of the three cells were all below 1 micromol.L-1. Finally, the anti-tumor activities of L12 and L13 were evaluated by the NOD/SCID mouse model of PLC human liver cancer, and the results were satisfactory. The study of anti-tumor compounds has theoretical significance and practical significance. Inter application significance.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:R914
【共引文獻】
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