大鼠三叉神經(jīng)中腦核神經(jīng)元對GABA的反應(yīng)及其相關(guān)發(fā)育學(xué)研究
[Abstract]:It is well known that gamma-aminobutyric acid (GABA) is an important inhibitory neurotransmitter widely distributed in the mammalian central nervous system. It can bind to the corresponding GABA receptors to perform the corresponding physiological functions. In addition, the expression of GABAAR alpha 1 and GABAAR alpha 3 receptor subtypes was also observed in Vme neurons. Although Vme God was reported on brain slices, the expression of GABAAR alpha 1 and GABAAR alpha 3 receptor subtypes was also observed in Vme neurons. The excitatory response of meridians to GABA is still unclear due to methodological limitations. Cationic-Cl-cotransporters responsible for chloride transport may be involved in the excitatory response of GABA in Vme neurons. However, the related studies have not been reported so far.
Cationic-Cl-cotransporters play a major role in maintaining the balance of intracellular and extracellular Cl-concentrations. Of the seven reported cationic-Cl-cotransporters, only four cationic-Cl-cotransporters KCC1, KCC2, KCC3 and NKCC1 are expressed in the nervous system. Among them, KCC2 transports Cl-outward in neurons, while NKCC1 transports Cl-outward in neurons. The expression and change of KCC2 and NKCC1 in Vme neurons during postnatal development are rarely reported, and this change may be closely related to the effect of chloride channel opening. Contact.
Parvalbumin (PV) is a kind of calcium-binding protein. Previous studies have shown that PV is specifically expressed in the somas and processes of primary afferent neurons (such as large dorsal root ganglia and Vme) during development. At present, PV has been widely used as a specific marker of primary afferent neurons of proprioception. In addition, studies on postnatal development of Vme have also shown that PV is expressed in almost all Vme neurons. However, whether NKCC1, KCC2 and PV coexist in the postnatal development of Vme, and whether the coexistence ratio has changed, are these changes in relative quantity related to the changes in protein expression If there is no agreement, there is no definite answer.
Based on this, the following studies were carried out in this paper: (1) Single-cell patch clamp technique with end-buckle of mechanical separation band was used to observe the response of Vme neurons to GABA; (2) Western blotting and image analysis were used to observe the expression of NKCC 1 and KCC 2 in Vme neurons during postnatal development; (3) Immunofluorescence was used to observe the expression of NKCC 1 and KCC 2 in Vme neurons; (3) Immunofluores The coexistence of NKCC1 and KCC2 with PV in Vme neurons during postnatal development was observed by histochemical double labeling technique.
The first part is the response of neurons in the trigeminal mesencephalic nucleus to GABA in rats.
In this study, we observed the response of Vme neurons to GABA by single-cell patch clamp technique with end-buckle of mechanical separation. The results were as follows: when the clamping voltage was - 70 mV, the inward mPSCs were recorded on all Vme neurons, the average amplitude of mPSCs was 24 6550 The inversion potential was about - 30 mV, which was equivalent to the Cl-equilibrium potential calculated by Nernst equation, and the current induced by presynaptic GABA was completely blocked when the GABAA receptor-specific antagonist Bicuculline (5 mu M) was administered. After elution, the mPSCs induced by GABA returned to the previous level.
These results indicate that GABA released from the presynaptic terminal cingulum binds to GABAA receptors distributed in the postsynaptic region and plays a regulatory role in Vme neurons. After GABAA receptors are activated, chloride channels are opened and chloride flow in Vme neurons in vivo and in vitro forms the basis of GABA's effect on Vme neurons.
Part 2 Expression and changes of NKCC1 and KCC2 in trigeminal mesencephalic nucleus neurons during postnatal development in rats
The expression of KCC 2 and NKCC1 in Vme neurons was observed by immunohistochemistry and Western blotting combined with image analysis in 0,4,7,10,14,21 postnatal male rats. The expression of NKCC1 began to express in the meta-cells, but the expression was relatively low. The expression of NKCC1 increased gradually with the development time, and reached the adult level at P10. Image-pro plus software was used to analyze the gray level of NKCC1 in Vme of six rats of different ages: P 0, P 4, P 7, P 10, P 14, P 21. Compared with P10, P14 and P21, the expression of KCC2 was weaker from P0 to P21, and there was no significant difference among different ages (P 0.05).
These results suggest that NKCC1 is gradually expressed at a high level during the postnatal development of Vme neurons, while KCC2 is always expressed at a low level, suggesting a high level of chloride ion in Vme neurons during adulthood. It is speculated that the increase of intracellular chloride concentration with the development of Vme neurons may be closely related to the effect of GABA on Vme neurons in adulthood.
The coexistence of NKCC1, KCC2 and PV in trigeminal mesencephalic nucleus neurons during postnatal development in rats
In this study, the coexistence of NKCC1, KCC2 and PV in P4, P7, P10, P14 and P21 was observed by immunofluorescence double labeling technique. The results showed that the coexistence rate of NKCC1 and PV increased gradually with development, and NKCC1 was almost expressed in all Vme neurons in adulthood. No double-labeled neurons were observed at any of the five different time points. In the positive control experiment, the expression of KCC2 was observed in the Purkinje cell layer of the cerebellum. The molecular basis of excitatory response.
【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】:2007
【分類號】:R338
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