組胺作為一種交感神經(jīng)遞質(zhì)的新證據(jù)
[Abstract]:Background and purpose
Histamine (HA) is an important autoactive substance in the human body. It has extensive physiological function and also participates in the pathophysiological process of mediating various diseases. In the central nervous system, there is a complete HA energy system, and HA as a central neurotransmitter is involved in mediating cognitive memory, sleeping awakening, drinking water intake and so on. In the peripheral group In the fabric, HA is mainly stored in two forms of mast cell source and non mast cell source. Mast cell derived HA is involved in the pathological process of mediating allergy. The physiological and pathological effects of non mast cell derived HA are not very clear. It has been found that non mast cell derived HA exists in the peripheral nerve of the stomach and intestines of the rat, and the superior cervical ganglion (Su Perior cervical ganglion, SCG), carotid body sensory neurons, etc., suggesting that HA may be associated with the activity of these neurons. Our previous study found that in the neurons of SCG of the guinea pig, the histamine acid decarboxylase (Histidine decarboxylase, HDC) and the tyrosine hydroxylase synthase of noradrenaline (Norepinephrine, NE) were involved in the SCG of the guinea pig. (Tyrosine hydroxylase, TH) coexist with the dopamine beta hydroxylase (Dobamine- beta -hydroxylase, D beta H), and both HA and NE coexist. Stimulating sympathetic nerve endings can release HA and NE from the sympathetic nerve endings. We first suggested that HA is likely to be a new sympathic neurotransmitter that has not yet been recognized, and proposes the hypothesis that HA participates in the negative feedback regulation of sympathetic neurotransmission. However, does the coexistence of HA and NE in sympathetic neurons are universal? What is the subcellular localization of HA in sympathetic neurons and whether HA is released from sympathetic neurons to follow the classics The release of neurotransmitter vesicles? These are questions that must be answered by the final definition of HA as a new sympathetic neurotransmitter. Based on the above problems, this study uses multiple immunofluorescence markers, anterograde tracing and laser confocal microscopy, to observe the sympathetic ganglion and sympathetic nerve endings of HA in different species of animals. Distribution and coexistence with NE; the subcellular localization of HA in sympathetic nerve endings and cultured sympathetic ganglion cells was observed by pre embedding immunoelectron microscopy, and on the primary cultured SCG cells of newborn guinea pigs, FM1-43 fluorescent dyes were used to study the release of HA synaptic vesicles and the kinetics of movement, which finally confirmed that HA was a new sympathetic nerve. The research in this field is of great theoretical significance to reveal the new function of sympathetic nerve, to understand the pathogenesis of the disease related to the disorder of sympathetic nervous disorder, and to find new potential therapeutic targets for potential treatment.
Result
1. coexistence of histamine and NE in the sympathetic nervous system of different animals
In this study, immunofluorescence double labeling and laser confocal microscopy were used to detect the coexistence of HA and NE in the sympathetic nerve endings of mice and guinea pigs and the sympathetic nerve terminals of the mesenteric arteries in mouse SCG, dog SCG and abdominal sympathetic ganglion neurons, and in the SCG of mice and dogs, the double standard rate of HA in the NE like immunoreactive neurons was respectively in mice and dogs. For 70% and 40%, the double standard rate of HA in NE like immun-positive neurons in the abdominal segment of the dog was 60%. in the vas deferens of mice and guinea pigs, and on the mesenteric artery specimens, the double standard rate of HA in the NE like immun-positive nerve fibers was 80% and 30%. respectively in the local microinjection of SCG in guinea pig SCG (Biotinylated dextranamine, BDA). A guinea pig heart specimen was taken to observe the HA. results in the sympathetic fibers and terminals projected from SCG to the heart by immunofluorescence three markers. The results showed that the BDA tracer projected into the sympathetic fibers of the heart, 20% of the tracer fibers were HA like immunoreactive, and 10% of the tracer fibers presented HA and NE like immunoreaction. The results indicated that HA was widely distributed in the sympathetic nervous system of different species of animals at the cellular level, and coexisted with NE, providing a direct morphological evidence for the definition of HA as a new sympathetic neurotransmitter.
2. subcellular localization of histamine in sympathetic nerve terminals and cultured SCG neurons
In the innervation of the sympathetic nerve endings of the guinea pig's vas deferens and the primary cultured guinea pig SCG neurons, the immuno electron microscopy showed that the HA like immunoreactive substance was located in the small vesicles with a diameter of about 50 nm, and that the HA positive vesicles accounted for more than 90% of the total vesicles, and the large vesicles (diameter 100 nm) and individual small vesicles were not H. A immunoreactive substances. The results showed that HA mainly existed in the vesicles of the sympathetic neurons. This result provides a direct morphological evidence for the definition of HA as a new sympathetic neurotransmitter at the subcellular level.
3. the kinetics of histamine synaptic vesicle circulation in SCG neurite outgrowth
Using FM1-43 fluorescent dye and HA immunofluorescence staining, the release kinetics of HA vesicles and the movement process of HA vesicles were observed on the SCG neurites in the cultured guinea pigs. The laser confocal microscope imaging and statistical analysis were made. The results of decolorization (Destaining) showed that the red fluorescence signal intensity of HA in the protuberance of the SCG God and the FM1-43 green in the protuberance of the SCG God. The intensity of the fluorescence signal increased with the increase of the depolarization time, and showed a gradual weakening. Both showed significant positive correlation (r = 0.989, P 0.01). It showed that the release of HA followed the general rule of the kinetics of vesicle release. The red fluorescence intensity and FM1-43 representing the HA were determined by the fixed cells at different time points of depolarization. The results of green fluorescence intensity indicate that the red fluorescence intensity of HA is stronger than the green fluorescence intensity of FM1-43. Due to the depolarization conditions used in this study, the FM1-43 fluorescence signal mainly reflects the release of circulating vesicles. The difference between the fluorescence intensity of HA and FM1-43 suggests that the vesicles stored on the HA at the nerve sites may exist. The results of Fluorescence recovery after photobleaching (FRAP) combined with immunohistochemical study showed that the diffusion rate of HA vesicles at SCG neurites was 0.09 u m2/s, and the other vesicles of 0.08 u m2/ s.HA vesicles were not significantly worse than other vesicles. Different.
Conclusion:
1. HA is ubiquitous in the sympathetic nervous system of many animals and coexists with the classical sympathetic neurotransmitter NE.
2. HA is mainly stored in the sympathetic synaptic vesicles.
The release of HA vesicles in 3. sympathetic neurons follows the classical neurotransmitter vesicle cycle dynamics. The storage of HA vesicles may be divided into release vesicles and reserve vesicles.
【學(xué)位授予單位】:第四軍醫(yī)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2007
【分類號(hào)】:R363
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