孤束核在內毒素致大鼠炎癥中的作用及其機制研究
[Abstract]:Inflammation is a common clinical pathological process, which can be produced in various parts of the body and organs, such as folliculitis, tonsillitis, pneumonia, hepatitis, nephritis and so on. Acute inflammation usually has red, swollen, hot, painful, functional concealment and other changes. These changes are essentially the result of the body's struggle with inflammatory factors. Inflammatory factors, on the one hand, cause damage to tissues and cells, causing degeneration and necrosis of local tissues and cells; on the other hand, induce and increase the body's anti-disease function, promote the clearance of inflammatory factors, repair damaged tissues, so as to achieve a new balance between the internal and external environment and the internal environment of the body. Many chronic diseases such as rheumatoid arthritis and Crohn's disease are associated with inappropriate inflammation.
The recently discovered cholinergic anti-inflammatory pathway can effectively reduce the release of a variety of pro-inflammatory factors and significantly inhibit systemic and local inflammation. Acetylcholine (Ach) interacts with the immune system to complete the anti-inflammatory effect. Vagus efferent nerve and its transmitter Ach participate in the anti-inflammatory response, indicating that the presegmental neurons located in the dorsal vagal nucleus (DMV) are activated in the inflammatory response, while the three nuclei of the dorsal vagal nucleus, the nucleus tractus solitarius and the final region are anatomically activated. Peripheral immune information can be transmitted to the brain in two ways: one is that cytokines in the blood enter the brain through the last area (AP), which lacks the blood-brain barrier, and are transmitted directly from AP to DMV, or from AP through the nucleus tractus solitarius (NTS). We found that the expression of DMV, AP and C-Fos in the brain stem of endotoxin-induced inflammation rats were significantly increased, suggesting that AP and NTS were involved in the inflammatory response. It is not clear whether AP with blood-brain barrier enters the brain through the vagal afferent nerve to NTS or both. The expression of c-Fos in the right NTS and DMV is significantly higher than that in the left after LPS injection in rats such as G.E. Hermann. SimonsCT and other studies have found that peripheral inflammation information mainly enters NTS through the left vagal nerve. It has been found that a large number of pERK-like immunoreactive neurons have been observed in NTS, and ERK1/2 pathway plays an important role in the signal transduction of visceral sensation and movement, but it is not found in the solitary tract. The activation of ERK1/2 pathway in the nucleus has not been reported to affect the inflammatory response. In this study, endotoxin inflammation model was used to record the vagal discharge and the expression of c-Fos in DMV and AP neurons by electrophysiological and immunohistochemical methods, respectively, to explore the role of NTS in the inflammatory response and the role of DMV, NTS and AP in the inflammatory reaction. The correlation should be further explored to explore the role of DMV, NTS and AP in cholinergic anti-inflammatory pathway.
This study is divided into three parts.
The first part was to observe the levels of tumor necrosis factor-alpha (TNF-alpha), white blood cell count, vagal discharge, arterial blood pressure and the expression of c-Fos in DMV and AP in the endotoxin inflammation model of rats after bilateral NTS lesion. The experiment was divided into three groups: sham lesion of bilateral NTS+LPS group, lesion of bilateral NTS+LPS group and lesion of bilateral NTS+normal saline group. Compared with bilateral + LPS group and bilateral + normal saline group, the levels of TNF-alpha increased significantly, while the expression of c-Fos of AP and DMV increased, but the difference was not significant, indicating that LPS injection induced inflammation in rats; the levels of TNF-alpha increased significantly, and the expression of c-Fos of AP and DMV decreased compared with bilateral + LPS group and sham + LPS group. Less, but the difference is not significant, indicating that NTS is involved in the anti-inflammatory response.
The second part was to observe the levels of tumor necrosis factor-alpha (TNF-alpha), the number of white blood cells, vagal discharges, arterial blood pressure and the expression of C-Fos in DMV and AP. The experiment was divided into four groups: left + LPS group, left + LPS group, right + LPS group and right + LPS group. RESULTS AND DISCUSSION: Compared with the left + LPS group and the false + LPS group, the levels of TNF-alpha were significantly increased, and the expression of c-Fos in DMV was significantly decreased. The levels of TNF-alpha in the right + LPS group and the false + LPS group were not significantly changed, and the expression of c-Fos in DMV was significantly increased, suggesting that NTS in the left and right sides was anti-inflammatory. The left NTS is involved in the anti-inflammatory response, while the right NTS may have less effect on the inflammatory response.
In the third part, the effects of PD98059 on the expression of c-Fos in LPS-induced inflammatory AP and DMV were observed. The experiment was divided into two groups: PD98059+LPS injection group and normal saline+LPS injection group. The process of transmitting inflammatory information to DMV.
【學位授予單位】:山東師范大學
【學位級別】:碩士
【學位授予年份】:2012
【分類號】:R363
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