老年性癡呆與TOLL樣受體表達(dá)的研究
[Abstract]:Research background
Alzheimer's disease (AD) is a degenerative disease occurring in the central nervous system. It is the most important type of dementia in the elderly, and the cause of the disease is unknown. About 35000000 people worldwide are suffering from this disease. The characteristic features of this disease are progressive memory impairment and the pathological features of cognitive dysfunction.AD. The changes in the formation of beta amyloid peptide (beta -amyl oid, A beta) in the senile plaques were caused by abnormal aggregation of tau protein, the decrease of cortical cells in varying degrees, and the complicated causes of astrocyte proliferation and hypertrophy of.AD, in which the mechanism of neuritis is in the progression and development of Alzheimer's disease. The important role of Ap deposition in the activation of microglia may be the core pathological mechanism of AD, the.TOLL- like receptor (Toll-like recepter, TLR) family members can induce the immune response by identifying various pathogen related molecular models (pathogen associated molecular pattern, PAMP). Some studies confirm Toll Like receptor 2 (TLR2) may play an important role in the neurodegenerative mechanism and progression of AD. Moreover, TLR2 participates in the uptake and removal of AD related A beta. Our previous study has shown that the TLR2 gene changes are associated with the genetic susceptibility to AD.
In humans, there are a number of polymorphic loci in the TLR2 gene, and their region is a genetic susceptibility region of AD. Therefore, we first proposed that the genetic polymorphism of the TLR2 gene may be a genetic risk factor for AD, and the TLR2 gene and protein expression of peripheral blood mononuclear cells may be a biomarker for the early diagnosis of AD.
Method
This study uses the "very likely AD (probable)" standard in the American neurology, language disorder and Stroke Research Institute of Alzheimer's disease and related diseases (NINCDS - ADRDA) to select 60 cases of LOAD patients (age 65 years old, ethnic Han, female 33, average age 80.2 + 8.2 years old), and select 60 healthy subjects as controls at the same time as control. (34 women, with an average age of 80.6 + 6.3 years old). All the subjects were all the Han people in the north of China and had no relationship. All the selected patients were fasted for 12 hours, taking 5.5mLEDTA anticoagulant in the morning empty blood, using real time fluorescence quantitative polymerase chain reaction (RT-PCR), flow cytometry and single tube bidirectional allele specific amplification, respectively. MRNA, plasma protein expression was detected. SPSS11.5 statistical software was used for statistical analysis. The comparison of the characteristics of the case group and the control group was compared with the t test or the chi square test. The comparison among the groups was compared with the single factor analysis of variance, and the 22 of the groups was compared with the Bonferroni method. The evaluation of mRNA, protein and MMSE was evaluated by the correlation of Pearson moment. The correlation.P0.05 was statistically significant. All statistical tests were both bilateral probability tests and P0.05 as a statistically significant standard. The general characteristics of the subjects were measured to ensure that two groups of researchers were not significant in age, sex, BMI, blood pressure, HDL, LDL, cholesterol, and blood sugar. There is a difference.
Result
The results showed that the expression of TLR2mRNA in the case group was higher than that in the control group (TLR2:0.390 + 0.204 / 0.281 + 0.167, P0.01). The protein expression of TLR2 in the case group was significantly higher than that in the healthy control group (TLR2:97.12 1.67% to 41.07 + 18.44%, P0.01), and the expression of TLR2mRNA in both the case group and the healthy control group was all with TLR2. Protein expression was significantly correlated (TLR2:r=0.980 and 0.976, P0.01, respectively).
conclusion
In this experiment, the expression of mRNA and plasma protein levels in peripheral blood of LOAD patients in northern Han population of northern China was studied. The level of TLR2mRNA and its protein in group LOAD was significantly increased, and the level of TLR2mRNA was significantly correlated with the protein expression of TLR2. It was proved that the expression of TLR gene in the Han population in northern China was related to the susceptibility to LOAD.
Research background
The history of the To1l like receptor is only 20 years old, but the discovery of Toll like receptors opens up a new era in understanding how innate immune cells identify exogenous (i.e. microbial species) and endogenous (organism derivatives) pathogenic molecules and subsequently trigger the mechanism of inflammation. These studies provide a leap in the revival of the innate immune system. Studies in the field of immunology have found that conserved innate immunity in the system not only provides the first line of defense against microbial invasion, but also affects the tissue damage response and controls the activity of adaptive immunity.
The characteristics of AD are characterized by the formation of insoluble beta amyloid (A beta) deposits in the cortex. The formation of the sediments is associated with the microglia mediated inflammatory response. Recent studies have shown that the Toll- like receptor (Toll-like recepter, TLRs) participates in the inflammatory response of the.TLR family members by identifying various pathogens. Pathogen associated molecular pattern (PAMP) triggers the immune response to the body. Some column studies have confirmed that Toll like receptor 4 (TLR4) may play an important role in the neurodegenerative mechanism and progression of AD. Moreover, TLR4 participation in the uptake and clearance of AD related A beta has been confirmed by our previous study of TLR4 genes. The risk of genetic susceptibility is related.
A number of previous studies have found that the TLR4 gene has a number of polymorphic loci and is associated with the genetic susceptibility to AD. Therefore, we first proposed that the genetic polymorphism of the TLR4 gene may be a genetic risk factor for AD, and the expression of TLR4 gene and protein in peripheral blood mononuclear cells may be an early diagnostic biomarker of AD.
Method
This study uses the "very likely AD (probable)" standard in the American neurology, language disorder and Stroke Research Institute of Alzheimer's disease and related diseases (NINCDS - ADRDA) to select 60 cases of LOAD patients (age 65 years old, ethnic Han, female 33, average age 80.2 + 8.2 years old), and select 60 healthy subjects as controls at the same time as control. (34 women, with an average age of 80.6 + 6.3 years old). All the subjects were all the Han people in the north of China and had no relationship. All the selected patients were fasted for 12 hours, taking 5.5mLEDTA anticoagulant in the morning empty blood, using real time fluorescence quantitative polymerase chain reaction (RT-PCR), flow cytometry and single tube bidirectional allele specific amplification, respectively. MRNA, plasma protein expression and Toll like receptor 4 (TLR4) gene locus 3'UTR11367 polymorphism were detected. Statistical analysis was performed using SPSS11.5 software. The comparison of the characteristics of the case group and the control group was compared with the t test or chi square test. The comparison between the groups was compared with the single factor analysis of variance, and the 22 of the groups was compared to Bonferro. The Ni method and P0.05 were statistically significant. All statistical tests were both bilateral probability tests, with P0.05 as a statistically significant standard. The general characteristics of the subjects were measured to ensure that two groups of researchers had no significant differences in age, sex, BMI, blood pressure, HDL, LDL, cholesterol, and blood sugar.
Result
The results showed that the expression of TLR4mRNA in the case group was higher than that in the control group (TLR4:0.503 + 0.195 / 0.322 + 0.183, P0.01). The protein expression of TLR4 in the case group was also significantly higher than that in the healthy control group (TLR4:66.56 23.74% to 14.83 + 4.31, P0.01). The expression of TLR4mRNA and TLR4 eggs in the case group and the healthy control group were also significantly higher than that in the healthy control group. The expression of white was significantly correlated (TLR4:r=0.938 and 0.970, P0.01). In the case group, the expression level of TLR4 in the genotype CC was significantly lower than that in the genotype GG homozygote and GC heterozygote. In the healthy control group, the protein expression level of TLR4 was not statistically significant in the three genotypes.
conclusion
This experiment was the first time to study the expression of mRNA and plasma protein in peripheral blood of patients with LOAD in the Han population of northern China. The level of TLR4mRNA and its protein in group LOAD increased significantly, and the level of TLR4mRNA was significantly correlated with the protein expression of TLR4..TLR4 gene 3 'UTR11367 genotype increased the expression of whole blood TLR4 protein in LOAD patients. It is proved that the expression of TLR gene is related to LOAD susceptibility in Han population of northern China.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2012
【分類(lèi)號(hào)】:R749.16
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