SIRT1在創(chuàng)傷性腦損傷后的功能及機(jī)制研究
[Abstract]:Background of the study
Traumatic brain injury is a kind of common central nervous system injury disease . It has very high fatality rate and disability rate . It has attracted extensive attention from the international health organization . It has been found that the main mechanisms of traumatic brain injury include glutamate excitotoxicity , DNA damage , oxidative stress generation and regulation of pro - apoptotic factors .
SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.Conclusion SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.SIRT1.@@
experimental purpose
( 1 ) To clarify the regularity of expression and biological function of SIRT1.In this study .
( 2 ) To explore the mechanism of mutual regulation between SIRT1 and MAPK / ERK pathway and its role in the treatment of the disease .
( 3 ) To explore the possible mechanism of mutual regulation and protective effect between SIRT1 and homeria in the aftermath .
experimental method
( 1 ) Cell culture : primary culture and identification of fetal rat cortical neurons ;
( 2 ) establishing the model of the isolated mechanical injury model and the mouse weight falling closed brain injury model to simulate the traumatic brain injury under the body condition ;
( 3 ) Molecular expression and localization : Western blot , immunofluorescence and immunohistochemistry were used to detect the expression and spatial location of various molecules .
( 4 ) Assessment of neuronal damage : The damage degree of neurons was detected by using LDH kit and PI / hoechst living cell staining ;
( 5 ) Assessment of brain injury : the degree of brain injury in mice after treatment with neurological score ( ) ;
( 6 ) Apoptosis was detected by Caspase - 3 or TUNEL staining .
( 7 ) SIRT1 : The SIRT1 inhibitor salermide and siRNA were used to downregulate the expression of SIRT1 in neurons .
( 8 ) MAPK / ERK pathway regulation : ERK specific blocker PD98059 and U0126 inhibit MAPK / ERK pathway activation ;
( 9 ) Homer1a Regulation : The expression of Homer1a in ex vivo cultured neurons was regulated by using slow virus packaged homer1a overexpression plasmid .
experimental results
The results showed that the mechanical injury model of ex vivo neurons could significantly increase the release of LDH in the neurons .
TUNEL staining showed that the number of apoptotic cells increased significantly in 24 h post - treatment neurons .
Western blot showed that the expression of caspase - 3 increased significantly in the early stage after injury , and gradually declined to normal level in the late injury period . In the model of mouse weight drop closed brain injury , the blood glucose level of mice after the injury increased significantly from 3 hours after injury , and returned to normal after 5 days after injury .
TUNEL staining showed that the number of TUNEL - positive neurons in the injured side cortex increased significantly at 12 h post - treatment .
The expression of caspase - 3 increased 3 hours after injury , and returned to normal after 3d .
Immunofluorescence staining showed that the expression of activated caspase - 3 in the injured side cortex increased significantly in the injured side cortex , and further confirmed that the number of apoptotic neurons in the injured side cortex increased significantly in the injured side cortex . In addition , the ex vivo and in vivo studies showed that the expression of SIRT1 increased significantly in the posterior neurons , and then gradually recovered to the normal level . Immunohistochemical staining showed that the expression of SIRT1 increased significantly in the injured side cortex and the axons of the neurons in the hippocampus site .
Experiment 2 : Traumatic brain injury can cause activation of MAPK / ERK pathway in isolated neurons and animal brain tissues .
Western blot showed that salermide inhibited the expression of SIRT1 in neurons , ERK pathway activation was significantly inhibited , and the expression of caspase - 3 was significantly increased .
In order to observe whether the activation of MAPK / ERK pathway in mice was inhibited significantly , the activation of ERK pathway was significantly inhibited after the activation of MAPK / ERK pathway in mice .
In the third part , the expression of homer1a and p - ERK in the neurons were significantly increased after reaching the peak , but homer 1b / c was stable . The expression of homer1a and p - ERK was inhibited in the neurons and the expression of 尾 - catenin was inhibited .
At the same time , the expression of homer1a and 尾 - catenin was significantly decreased after the pretreatment of the neuron with the agonist resveratrol of SIRT1.In addition , the expression of homer1a and 尾 - catenin was significantly decreased after the activation of the MAPK / ERK pathway . The expression of homer1a and 尾 - catenin was significantly inhibited in the neurons transfected with the slow virus .
experimental conclusion
The results of this study confirm that SIRT1 and homer1a , as endogenous neuroprotection factors , play a role in neuroprotection .
SIRT1 may regulate the expression of homer1a by interacting with MAPK / ERK pathway . The interaction between SIRT1 and Homer1a regulates 尾 - catenin to further protect neuron apoptosis . The results not only illustrate a self - protection mechanism in neurons , but also provide potential drug intervention targets and new treatment strategies for the treatment of traumatic brain injury .
【學(xué)位授予單位】:第四軍醫(yī)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2013
【分類號】:R651.15
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