GABA_B受體在脊髓水平痛覺調(diào)節(jié)中的作用
[Abstract]:GABA-aminobutyric acid (GABA) is an important inhibitory neurotransmitter in the central nervous system, and the GABA _ B receptor is a type of G-protein-coupled metabotropic receptor in the GABA receptor family. The physiological function of the GABA _ B receptor is composed of GABA _ BR1 and GABA _ BR2. It has been shown that the GABA _ B receptor is involved in the pain modulation of the level of the spinal cord, and the GABA _ B receptor is expressed in the dorsal root ganglion neurons. However, there is a lack of research on the characteristics of the distribution of the GABA _ B receptors in the 2 subpopulations of the dorsal root ganglion and the non-peptide, and whether the GABA _ B receptor in the central process of the dorsal root ganglion is affected by the presynaptic inhibition of the interneurons in the dorsal horn of the spinal cord. At the same time, it is known that astrocytes play an important role in the horizontal pain modulation of the spinal cord, and can sense the function changes of various inflammatory factors released by the central process tip, and the spinal-like astrocytes are also immunopositive for GABA _ B receptors. However, the presence of the GABA _ B receptor in astrocyte in the inflammatory environment has not been reported in the presence of phosphorylation, transcription and translation of the GABA _ B receptor. In view of the above problems, the subject has done the following four tasks: 1. The central process of two different subcluster neurons was studied by means of fluorescent double-labeled immunohistochemistry. The distribution of the dorsal horn of the spinal cord was characterized in that the GABA _ BR1 and the CGRP antibody and the anti-GABA _ BR1 and the IB4 antibodies were respectively double-labeled, and the neuronal cell and the central process of the GABA _ BR1 in the dorsal root ganglion of two different subpopulations were observed under the laser confocal microscope. The results showed that 94% of the peptides and 88% of the small neurons of the non-peptide subpopulations express GABA _ BR1, which are present in the cell of the neuron, which may be distributed in the central process of the specific lamina of the dorsal horn of the spinal cord. The results show that in the process of hyperalgesia, both the dorsal root ganglion peptide and the non-peptide can play a role in the horizontal pain modulation of the spinal cord through the GABA _ B receptor, but the effect The CGRP and IB4-positive dorsal root ganglion neurons in the normal rats were observed under the laser confocal microscope by means of fluorescent double-labeled immunocytochemical and immunoelectron microscopy. The relationship between the GABA and the middle neuron in the dorsal horn of the spinal cord and the study of the superficial GABA _ B receptor in the dorsal horn of the spinal cord The ultrastructure of the central process of the immune-positive dorsal root ganglion neurons showed that the GABA-B receptor, the CGRP-positive and the IB4-positive dorsal root ganglion neurons of the spinal dorsal horn of the spinal cord were closely related to the central neurons of the central and spinal dorsal horn of the dorsal root ganglion of the spinal cord. The central tip of the contact ball is an immunopositive of the GABA _ B receptor and acts as a presynaptic or postsynaptic The formation of symmetries and asymmetric synapses between the component and the peripheral tip. The GABA _ B receptors in the dorsal root of the dorsal root ganglion may be distributed through the GABA _ B distributed on the primary afferent terminal of the dorsal root ganglion neurons. 3. In vitro culture, immunocytochemistry and Western blot, the cAMP response element binding protein (cAMP response element binding protein) of the rat astrocyte cultured in vitro was studied by the method of in vitro culture, immunocytochemistry and Western blot. The effect of CREB and the phosphorylation of GABA _ BR2 (Ser892 site). The results showed that after the 10. m The change of the level of the phosphorylation of REB was related to the time, and the difference between the control group and the control group was significant. The phosphorylation level of CREB, the transcription of regulatory genes, and the initiation of a series of downstream reactions. At the same time, after 10. m u.M of PGE _ 2, the astrocyte GA The level of phosphorylation of BA _ BR2 (Ser892) was significantly higher and time-dependent. The phosphorylation of BR2 (Ser892) was increased, and it was possible to take part in the regulation of cellular physiological activities. The effect of _ 2 on the transcription and translation of GABA _ BR1 and GABA _ BR2 in rat astrocytes cultured in vitro. The results showed that the PGE _ 2 was stimulated by 10. m The level of transcription and translation in the rat astrocyte was significantly reduced compared with that in the control group, and the difference was significant and time-dependent. It was suggested that a certain dose of PGE _ 2 stimulation could cause the rat astrocyte GA. The changes of the mRNA and protein levels of the BA _ B receptor may affect the physiological state of the rat astrocytes in the inflammatory environment. In conclusion, the results show that the central process tip of the dorsal root ganglion and the dorsal horn of the spinal cord can be in the middle The morphological basis of presynaptic inhibition between the neurons can be involved in the level of the spinal cord through the presynaptic GABA _ B receptor. Hyperalgesia; at the same time, in the inflammatory environment, the GABA _ B receptor phosphate in the astrocytes
【學(xué)位授予單位】:復(fù)旦大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2006
【分類號(hào)】:R329;R33
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