KIR4.1-293A細(xì)胞模型的構(gòu)建及其在中樞神經(jīng)系統(tǒng)脫髓鞘疾病中的研究
[Abstract]:[Background] Common inflammatory demyelinating diseases of the central nervous system (CNS) include neuromyelitis optica spectrum disorders (NMOSD), multiple sclerosis (MS), optic neuritis (ON), acute disseminated encephalomyelitis (ADE). Ephalomyelitis, ADEM, etc. Since the discovery of aquaporin 4 (AQP4) antibody in 2004, the antibody has been recognized as the most significant diagnostic marker of NMOSD and has important value in the treatment and prognosis of the later stage of the disease. However, for MS, there is still a lack of relevant biomarkers to diagnose MS, or to evaluate the patient's recovery. Therefore, scholars are constantly trying to find other autoantibodies associated with CNS demyelinating diseases. Inwardly rectifying potassium channel protein 4.1 (KIR4.1) is expressed in neuroglial cells of the central nervous system. Its main functions include maintaining intracellular and extracellular functions. Studies have shown that knockout of KIR4.1 in mouse models can lead to severe neurological deficits, including ataxia, seizures and neuronal deafness. KIR4.1 dysfunction and epilepsy, brain trauma, cerebral ischemia, inflammation, etc. Amyotrophic lateral sclerosis is closely related to the pathogenesis of neurological diseases such as Alzheimer's disease. The membrane protein ion channel plays an indispensable role in the central nervous system, which prompts many teams to join in the study of the potential role of KIR4.1 in human diseases. In the central nervous system, AQP4 is mainly distributed in the brain. The membranes of ependymal cells and astrocytes of spinal cord tissue are concentrated on the foot process membranes of astrocytes and are coupled with the functions of KIR4.1. They are involved in maintaining the normal function of the central nervous system by mediating the intracellular and extracellular osmotic balance of K + and water transport between the central nervous system and the blood. Bond structure. AQP4 antibody is a biomarker of NMOSD and participates in the cellular immune process of NMOSD. Current studies have found that the pathological changes of immune response in MS patients affect both B and T cells. Immunoglobulin synthesis in cerebrospinal fluid of MS patients has been detected to increase, oligoclonal bands and complement deposition have occurred. Whether KIR 4.1 can be used as a biomarker for the diagnosis, prognosis and monitoring of demyelinating diseases after APQ4 antibody? Up to now, the results of KIR 4.1 antibody detection in MS patients are different from each other, and the positive rate of KIR 4.1 antibody is different from each other. The relationship between anti-KIR4.1 antibody and the pathogenesis of multiple sclerosis still needs further study. Part I: The plasmid composition of KIR4.1 and the construction of 293A cell model [Objective] To construct KIR4.1 plasmid, clone human KIR4.1 gene, transfer the gene into human embryonic kidney (HEK) 293A cells and construct cell model for serum KIR4.1. [Methods] 1. Construction of pEnter-KIR4.1 plasmid 1.1. Primer design and synthesis using primer design software Premier 5.0, according to the human KIR4.1 gene sequence published in Genebank, designed the upstream and downstream primers of KIR4.1 gene, including ASCI primer enzyme in the upstream, Not I primer enzyme in the downstream, 18S rRNA as internal reference, sent to Changsha Boshan Company. 1.2. Human KIR4.1 gene was synthesized. Total ribonucleic acid (RNA) was extracted from human cells by extraction kit, and purity was tested. Their complementary deoxyribonucleic acid (cDNA) was obtained by reverse transcription with the above-mentioned synthetic primers and human total RNA. KIR4.1-cDNA was used as a template for polymerase chain reaction (PCR) amplification. Then the PCR products were gel electrophoresis to determine whether the target gene was amplified successfully. 1.3. Enzyme digestion and plasmid construction were used to construct the PCR recovery products of KIR4.1-cDNA and pEnter vectors were digested by ASC I and Not I restriction endonuclease, respectively. KIR4.1-pEnter plasmid was obtained by ligation of KIR4.1 gene with pEnter vector by T7 ligase. The plasmid was transformed into JM09 competent cells (clonal type). Monoclonal cells were cultured overnight on the LB plate containing kanamycin. The monoclonal cells were selected for enlarged culture. The plasmid was extracted by Endo-free Plasmid Mini Kit II 50 kit and used for further culture. Identification of positive clones, pEnter empty vector as control. 1.4. pEnter-KIR4.1 plasmid identification enzyme digestion screening positive clone plasmids, and then sent to Boshan Company for gene sequencing, GeneBank and the results of the Boshan company's KIR4.1 gene sequence and Blast comparison. 2. KIR4.1-293A cell model construction of HEK 293A cell recovery and progress KIR4.1 plasmid was transfected into 293A cells by Lipofectamine 3000. pEnter empty vector was used as control. 3. Puromycin screened cell line pEnter stably expressing KIR4.1 as eukaryotic expression vector and carried purinomycin resistance. The optimal concentration of purinomycin (0.3 ug/mL) was determined when 293A cells were treated with purinomycin of different gradient concentrations for 48 hours. The KIR4.1-293A cell culture dish containing 0.3 ug/mL was added 48 hours after transfection. The screening medium of doxycycline began to be screened, and the liquid was changed regularly until all the cells in the blank group died without transfection. After screening, the surviving cells which had been transfected with KIR4.1-pEnter plasmid were amplified and cultured. 4. The cells stably expressing KIR4.1 were identified by Western blotting. The expression of KIR4.1 on 293A cells was identified by G and indirect immunofluorescence assay (IIFA). The KIR4.1-293A cell model successfully constructed will be used for the detection of serum KIR4.1 antibody. [Results] 1. PCR amplification product gel electrophoresis identification: KIR4.1-cDNA PCR products were identified by gel electrophoresis, the results showed that the map can be seen. Identification of plasmids (KIR4.1:1142bp). 2. KIR4.1. Identification of plasmids by enzyme digestion gel electrophoresis: Electrophoresis showed that there were clear bands near the corresponding theoretical values, proving the success of KIR4.1 plasmid construction. 2. The expression of KIR4.1 was 100% consistent with that of KIR4.1. Western blotting showed a specific band of KIR4.1-293A cell expression protein near 42kDa. The cells were detected by IIFA to stimulate green fluorescence on the cell surface and cells bound with KIR4.1 positive antibody, and to 4'6-diamidino-2-phenylindole (DAP). [Conclusion] The human KIR4.1 gene was successfully cloned and the expression plasmid of KIR4.1-293A was constructed. The stable cell lines stably expressing KIR4.1 protein were screened out on 293A cells, suggesting that the KIR4.1-293A cell model was successfully constructed. It can provide a reliable experimental method for the detection of serum antibodies and provide useful experimental basis for the further study of the pathogenesis of MS. Part II: Detection of serum KIR4.1 antibodies in patients with CNS demyelinating disease [Objective] To detect the serum levels of patients with CNS inflammatory demyelinating disease by constructing a KIR4.1-293A cell model. KIR4.1 antibody in the Second Affiliated Hospital of Guangzhou Medical University from December 2008 to December 2016, 188 patients with MS, 264 patients with NMOSD and other inflammatory neurological diseases were collected. There were 209 cases of ase, 203 cases of other non-inflammatory neurological disease (OND) and 40 healthy controls. All patients were not treated with immunosuppressive agents or glucocorticoids, and blood samples were taken intravenously in the morning and on an empty stomach. 2. The detection of KIR4.1 antibody in serum was based on cell method (cytometry). Cell-based assay (CBA) indirect immunofluorescence assay was used to detect KIR4.1 antibody in serum of patients. Fluorescein isothiocyanate (FITC) was used to label sheep anti-human IgG. All the results were analyzed and processed by SPSS (statistical package for social sciences) 16.0. The experimental data were classified as variable data. The positive rate between groups was tested by X2 test, P0.05 thought that there was no significant difference. Results The positive rate of KIR4.1 antibody in 188 patients with MS was 12.2%. There were 264 patients with NMOSD, 42 patients with NMOSD, 209 patients with other inflammatory nervous system diseases (OIND), 32 patients with positive rate (15.3%). 203 patients with other non-inflammatory nervous system diseases (OND) were positive. [Conclusion] KIR4.1 antibody can not be used as a biomarker to differentiate MS from other central nervous system autoimmune diseases for the time being, and whether the antibody is related to multiple sclerosis. Part 3: The expression of KIR4.1 (+) antigen in brain tissues of MS patients with serum KIR4.1 (+) was compared with that of healthy controls, and the relationship between KIR4.1 antibody and the pathogenesis of MS was discussed. The expression of KIR4.1 was detected by immunohistochemistry in 1 case of non-neurological autopsy brain tissue as control. [Results] The expression of KIR4.1 was normal in 3 cases, and no loss of KIR4.1 antigen was found in all 3 cases. [Conclusion] KIR4.1 antibody was not supported for the time being. Whether the antibody is related to the pathogenesis of multiple sclerosis remains to be further studied in the pathogenesis of MS.
【學(xué)位授予單位】:廣州醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:R744.5
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