缺血再灌注對大鼠頜下腺分泌功能影響的研究
[Abstract]:Objective severe keratoconjunctival xerosis is a disease with abnormal surface and lacrimal film caused by a variety of reasons, often causing eye discomfort, blurred vision and unstable tear, etc. Serious cases may lead to corneal and conjunctival lesions. It even causes loss of vision, which seriously affects the quality of life of the patients. At present, some therapeutic measures can be taken according to the severity of the patient's condition, but the decrease of lacrimal secretion seriously affects the therapeutic effect and further ophthalmological treatment. Vascularized submandibular gland transplantation is a new method to treat keratoconjunctival xerosis with saliva secreted from submandibular gland transplantation instead of lacrimal fluid. Clinical studies have confirmed the successful transplantation of the submandibular gland, and the dry eye symptoms of the patients have been improved. Good results have been achieved. Vascularized autotransplantation of submandibular gland will inevitably undergo denervation and ischemia-reperfusion, both of which may affect the secretory function of the gland. It has been proved that insufficient secretion of neurotransmitters and down-regulation of the signal transduction pathway of autonomic nerve receptors are the important mechanisms of the dysfunction of submandibular gland secretion. In addition to denervation, the transplanted glands undergo ischemia-reperfusion. At present, there is still little research on the injury-stress response of submandibular gland after ischemia-reperfusion. Therefore, this study speculated that ischemia-reperfusion injury may be an important cause of early dysfunction or loss of graft glands. In order to further investigate the effect of ischemia-reperfusion on the secretory function of submandibular gland transplantation, a rat model of submandibular gland ischemia-reperfusion in situ was established, which was controlled by preserving the secretory nerve branches of the submandibular gland in rats. To investigate the injury-stress response of submandibular gland in rats after simple ischemia-reperfusion and the changes of submandibular gland secretory function after ischemia-reperfusion. Materials and methods A rat model of in situ ischemia reperfusion of submandibular gland was established by preserving the nerve branches of the submandibular gland. The submandibular gland was reperfused for 1 h, 12 h, 24 h, 72 h after 90min ischemia, and as a time point to observe the sampling. In this study, the submandibular gland secretion was observed by Schirmer test at different time points. In order to observe the injury-stress response of submandibular gland after ischemia-reperfusion, the morphological changes of submandibular gland were observed by HE staining, the ultrastructural changes of tight junctions were observed by transmission electron microscopy (TEM), and the histological changes of submandibular gland were observed by transmission electron microscopy (TEM). Oxygen stress of glands was observed by detecting reactive oxygen species (Ros) and apoptosis of glandular cells was detected by TUNEL method. Results 1 h and 12 h after ischemia-reperfusion, the secretion of submandibular gland decreased significantly, and gradually returned to normal at 72 h after reperfusion. Histological observation showed that edema and inflammatory cell infiltration began to occur in glandular tissue after ischemia-reperfusion, and then returned to normal gradually after 12 hours of reperfusion. Ultrastructural observation showed that the tight junctions became blurred and electron density decreased at 1h and 12h after reperfusion. The levels of reactive oxygen species (Ros) and apoptosis also showed the same trend in glandular tissue. After 1 h and 12 h of reperfusion, the signal of reactive oxygen species (Ros) and the level of apoptosis in glandular tissue increased significantly. Conclusion the early injury-stress response of submandibular gland induced by ischemia-reperfusion is consistent with the decrease of early secretory function of submandibular gland after ischemia-reperfusion in rats. [WT5 "HZ] conclusion [WT5" BZ] [WT5 "BZ] This study confirmed that injury-stress response induced by ischemia-reperfusion injury is one of the important reasons for the early secretory dysfunction of transplanted glands.
【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】:R782
【共引文獻】
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