血管活性腸肽(VIP)在豚鼠形覺剝奪性近視眼中表達的動態(tài)觀察
[Abstract]:Background / objective myopia, as one of the most common refractive errors in the world, has become the focus of global prevention and control because of its high incidence. The prevention and treatment of myopia has been included in the World Health Organization (WHO) blind prevention program. There have been more than 200 years of research on myopia. Many hypotheses have been put forward on the mechanism of myopia, but so far it is not clear, let alone effective prevention and cure methods. Many experimental studies suggest that the occurrence of form-deprived myopia may be determined by the mechanism of local retinal regulation. In recent years, it has been found that vasoactive intestinal peptide (vasoactive intestinal peptide, VIP) is closely related to myopia. VIP, as a visual information molecule, may play a role in the transmission and regulation of visual information during the formation of myopia induced by vision. The expression of VIP was significantly increased in the retina of young chickens and primates, and increased with the increase of myopia. But the same dynamic changes have not been confirmed in the mammalian (form deprivation myopia, FDM) model of form deprivation myopia. This study was designed to observe and compare the expression of VIP in the retina of experimental group and control group after form-deprivation in guinea pig myopia model with different techniques, and to observe whether the change trend of VIP was consistent with that in young chicken. Further understanding the mechanism of its possible involvement in mammals provides a theoretical basis for seeking a new method of treatment or prevention. Methods A total of 60 healthy guinea pigs of 2-3 weeks old were randomly divided into two groups: one week and two weeks after 3 weeks of shading, 10 guinea pigs in each group were deprived of shape by monocular shading (monocular deprivation, MD). The right eye was taken as the deprivation eye (experimental group) and the left eye was exposed as the self-control group. In addition, 5 guinea pigs of the same age were randomly selected as the normal control group at the corresponding time points. The diopter and the length of the eye axis of the guinea pigs were measured before the occlusion and after 1 week and 2 weeks of MD. The eyeballs of 5 guinea pigs in shaded group, self control group and normal control group were randomly selected for HE staining and immunohistochemistry, and retinal tissues were taken from 5 guinea pigs for RT-PCR.. The results were analyzed statistically. Results there was no significant difference in diopter and eye axis length between the groups before and after the deprivation (P0.05), but there were significant differences in the diopter and the length of the eye axis between the three groups at 1 week and 2 weeks after the deprivation (P 0.01, P 0.01, P 0.01), while in the experimental group, there was no significant difference in the diopter and the length of the eye axis (P 0.01), while in the experimental group, there was no significant difference in the diopter and the length of the eye axis (P 0.01). The diopter and axial length of the control group increased with the increase of the deprivation time. In the normal control group, there was no significant difference in protein and mRNA levels in retina before and after deprivation of shape (P0.05), but there was no significant difference in protein and mRNA levels in the retina of the normal control group (P0.05). The difference was statistically significant between the three groups at 1 week and 2 ws after monocular deprivation (P0.05). There was significant difference (P0.01). In the experimental group, the retinal VIP mRNA increased with the increase of form deprivation time in the control group, but there was no significant difference in the normal control group (P0.05). Conclusion 1 shape deprivation for 1 week can cause myopia. The diopter and the length of eye axis increased with the prolongation of the deprivation time. 2VIPs may be related to the occurrence or development of formal-deprivation myopia. The expression of VIP in the retina of FDM guinea pigs increased with the prolongation of the deprivation time. It is consistent with diopter and eye axis length.
【學位授予單位】:青島大學
【學位級別】:碩士
【學位授予年份】:2010
【分類號】:R778.11
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