FKBP12.6對小鼠學習記憶的影響
[Abstract]:Objective: FK506 binding protein 12.6 (FK506 binding protein 12.6FKBP12.6), a member of FKBP protein family, is the intracellular target of immunosuppressant FK506. FKBP12.6 is composed of 108 amino acids and has a molecular weight of 12.6KD. in physiological state, it can bind to endoplasmic reticulum (ER) and sarcoplasmic reticulum (RyR2). Calcium channel can be stabilized to reduce the leakage of calcium ions in endoplasmic reticulum and sarcoplasmic reticulum, meanwhile, FKBP12.6 combined with FK506 can inhibit the activity of calmodulin (CaN), thus inhibit the immune response. FKBP12.6 mainly distributes in myocardium. FKBP12.6 is widely expressed in the central nervous system, including some brain regions related to learning and memory, such as hippocampus and amygdala, but its function in learning and memory is not clear. The purpose of this paper is to study the effects of FKBP12.6 knockout on new object recognition memory, object position recognition memory and conditional fear memory, and to explore the possible mechanism of FKBP12.6 knockout in terms of electrophysiology and protein expression. Method 1: 1. The mouse tail DNA gene was identified to determine whether it successfully knocked out the FKBP12.6 gene. 2. An experimental model was established to study the difference between FKBP12.6 knockout mice and WT mice in new object recognition memory and object position recognition memory. The fear memory test system based on Pavlov's conditioned reflex principle was established to study the difference of conditional fear memory between FKBP12.6 knockout mice and WT mice. The electrophysiological properties of amygdala neurons in FKBP12.6 knockout mice and WT mice were studied by patch clamp technique. The difference of c-fos protein expression in memory related brain region between FKBP12.6 knockout mice and WT mice was studied by immunohistochemical method. The result is 1: 1. The mice used in the experiment confirmed that they had successfully knocked out the FKBP12.6 gene. 2. 2. Compared with WT mice, the new object recognition memory, object position recognition memory and conditional fear memory of FKBP12.6 knockout mice decreased by .3. Compared with WT mice, the frequency of (miniature inhibitory excitatory post synaptic potential,mIPSP) in the amygdala region of FKBP12.6 knockout mice was not significantly changed, but the frequency of (miniature excitatory post synaptic potential,mEPSP) was significantly decreased by .4.The frequency of (miniature excitatory post synaptic potential,mEPSP in the brain of FKBP12.6 knockout mice was significantly lower than that of FKBP12.6 knockout mice. Compared with WT mice, the expression of c-fos protein in the amygdala of FKBP12.6 knockout mice decreased significantly. Conclusion the new object recognition memory, the object position recognition memory and the conditioned fear memory can be damaged by the knockout of the 1: FKBP12.6 gene, and the preliminary results indicate that the changes of mEPSP and c-fos protein expression levels in the amygdala may be related to the damage of conditioned fear memory.
【學位授予單位】:南昌大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:R338.64
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