腫瘤乏氧響應(yīng)的光學(xué)探針研究
[Abstract]:Most solid tumors have specific hypoxic microenvironment. The degree of tumor hypoxia is one of the important prognostic markers. In addition, hypoxia is directly related to tumor resistance to chemotherapy and radiotherapy. Therefore, the imaging and measurement of tumor hypoxia is very important for the diagnosis and treatment of cancer. At present, positron tomography (PET) and magnetic resonance imaging (MRI) have the disadvantages of expensive equipment, high background noise and difficult real-time continuous observation among tumor hypoxic imaging techniques. However, the optical imaging technology has the advantages of low cost, good portability, simple operation and convenient real-time observation. The application of optical imaging technology in tumor hypoxic imaging needs further research and development. In order to explore the optical imaging of tumor hypoxic microenvironment, we need to develop a highly sensitive and specific hypoxic optical probe to meet the needs of in vivo applications. At present, the reported hypoxic optical probes mainly include phosphorescent metal complexes and organic small molecule fluorescent probes containing hypoxia sensitive groups. The related studies mainly focus on the characterization of the properties in vitro. In vivo tumor hypoxic imaging attempts are rarely reported. In this paper, a new macromolecular optical probe was developed based on iridium complexes and biocompatible polymer materials. The developed probe has near infrared emission, high oxygen sensitivity, good water solubility and biocompatibility. It has the property of long circulation in vivo and can reflect the high permeability and stranded (EPR) effect of tumor. The optical imaging and measurement of tumor hypoxic microenvironment at both cellular and in vivo levels were studied using the developed macromolecular probes. The specific research contents are as follows: 1) Synthesis of an iridium complex-polyvinylpyrrolidone macromolecule hypoxia optical probe, test the basic optical properties of the synthesized macromolecular probe, and in cell monolayer cells and three-dimensional multicellular spheres, The hypoxia response ability of macromolecular probe was tested. In addition, hypoxia imaging was performed in mice subcutaneous tumor model, subcutaneous cancer cell model and lymphatic metastasis model in vivo. In addition, the biocompatibility and toxicity of probe molecules in vitro and in vivo were characterized. 2) based on the iridium complex polyvinylpyrrolidone macromolecule and polycaprolactone bpolyvinylpyrrolidone. Synthesis of nano-micelle probes containing iridium complexes. The basic structure and optical properties of nano-micelles were tested, and the anoxia-sensitive properties were tested in monolayer cells and three-dimensional multicellular spheres. In vivo application, the synthesized nano-micelle probe was applied to hypoxic imaging of mouse vasopulmonary metastasis model and plantar lymph node metastasis model. 3) A two-step probe design idea for amplifying tumor microenvironment signal was proposed. Based on the iridium complexes and polyethylene glycol, a macromolecular probe was synthesized for continuous response to acidification and hypoxia. The basic optical properties of the probe and its sensitivity to pH and oxygen partial pressure were tested. The cellular uptake properties and signal responses of the probes under different pH values and oxygen partial pressures were measured in cells. In addition, the continuous response of the probe was tested in mouse subcutaneous tumor model and subcutaneous cancer cell model. In addition, the biocompatibility and toxicity of the probe were tested.
【學(xué)位授予單位】:南京大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:R73-3
【共引文獻(xiàn)】
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