內(nèi)源性阿片肽在耐受和血管生成方面的活性研究
[Abstract]:Endogenous opioid peptide is a neurotransmitter and neuromodulator widely present in humans and animals. It has many physiological and pharmacological functions involving analgesia, development and endocrine, cardiovascular response, immune response and angiogenesis. The clinical use of opioids is limited by side effects such as tolerance, respiratory inhibition and constipation, so they are often used in combination with other adjuvant drugs to reduce their side effects. In addition to the central nervous system, there are also 渭 and 未 opioid receptors in vascular endothelium, and endothelial cells are the most important molecules involved in angiogenesis. The effects of melatonin on analgesic tolerance of opioid receptor agonists were studied and the effects of endogenous opioid peptides on angiogenesis were investigated in vivo and in vitro. The results are as follows: 1. In the tail flick test of warm bath in mice, injection of selective 渭 and 未 receptor agonists (endomorphin 1 and neoporphin I) into the lateral ventricle for four consecutive days could induce tolerance to drug analgesia in mice, respectively. Melatonin combined with receptor agonist could attenuate the analgesic tolerance of neoporphin I in a dose-dependent manner, but had no effect on the analgesic tolerance of endomorphin 1. In addition, the decrease of melatonin tolerance to neoporphin I analgesia could be antagonized by selective MT2 receptor antagonist luzindole. These results suggest that melatonin interferes with the neural mechanisms involved in 未 -receptor agonist analgesia tolerance through its own receptors. 2. The effect of endogenous opioid peptide on angiogenesis was studied in chorioallantoic membrane (CAM) of chicken embryo. Endomorphin-1, endomorphin-2 and neoporphin I could promote angiogenesis in a dose-dependent manner at 110 nmol/embryo. Naloxone, a non-selective opioid receptor antagonist, has no effect on angiogenesis in CAM, but can antagonize the angiogenesis of CAM by endogenous opioid peptide. These results suggest that endogenous opioid peptides (endomorphin-1, endomorphin-2 and neoporphin I) can stimulate angiogenesis in CAM, and this effect is mediated by opioid receptors. In addition, the regulation of endogenous opioid peptides on angiogenesis was studied in the proliferation, migration, adhesion and tubular formation of human umbilical vein endothelial cells (HUVEC). Endomorphin-1, endomorphin-2 and neoporphin I could promote the proliferation, migration, adhesion and formation of tubular structure of HUVECs in a dose-dependent manner, but at higher doses they showed inhibitory effects. Naloxone alone did not affect the proliferation, migration, adhesion and formation of tubular structure of HUVECs, but could antagonize the regulation of angiogenesis by endogenous opioid peptides. These data suggest that endogenous opioid peptides (endomorphin-1, endomorphin-2 and neoporphin I) can also regulate angiogenesis at the cellular level through opioid receptors.
【學(xué)位授予單位】:蘭州大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2008
【分類號】:R33;R96
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