Objective: To study sympathetic-sensory coupling in chronically compressed dorsal root ganglion (DRG) neurons in rats. Methods: In chronically compressed DRG model, the spontaneous activity of single fiber from the in...Objective: To study sympathetic-sensory coupling in chronically compressed dorsal root ganglion (DRG) neurons in rats. Methods: In chronically compressed DRG model, the spontaneous activity of single fiber from the injured DRG neuron was recorded, and lumbar sympathetic trunk was electrical stimulated to study the sympathetic modulation of spontaneous activities in injured DRG neurons. Results: Fifty-seven percent of spontaneous active neurons of injured DRG responded to sympathetic stimulation. The responses included simple excitation, excitation followed by inhibition and simple inhibition. The responses enhanced with the increase of sympathetic stimulation time. The responses to sympathetic stimula- tion could be blocked by intravenously injection of phentolamine, a-adrenorecepor antagonist. Fifty-three percent of injured DRG responded to norepinephrine (NE). The responses to NE were similar to those induced by sympathetic stimulation. Conclusion: Sympathetic-sensory coupling is virtually present in chronic compressed DRG neurons. NE released from sympathetic nerve terminals acts on a-adrenorecepor to influence spontaneous activities of injured DRG neurons.展开更多
Previous studies have shown that sympathetic nerves are related to certain types of pain, and this phenomenon is referred to as sympathetic-sensory coupling. Chronic pain resulting from nerve injury can be exacerbated...Previous studies have shown that sympathetic nerves are related to certain types of pain, and this phenomenon is referred to as sympathetic-sensory coupling. Chronic pain resulting from nerve injury can be exacerbated by sympathetic stimulation or relieved by sympathetic inhibition. In the present study, the correlation between pain and sympathetic nerves was analyzed in patients with severe pain in lower limbs, as we^l as in a chronically compressed dorsa~ root ganglion ~CCD） rat model （model of low back pain and sciatica）. Patients with severe pain in the lower limbs underwent chemical lumbar sympathectomy （CLS）, and the analgesic effects of CLS were compared with painkillers. Results demonstrated significantly relieved lower limb pain following CLS, and the analgesic effects of CLS were superior to those seen with painkillers. In the CCD rat model, dorsal root ganglion neuronal activity significantly increased as a result of electrical stimulation to the sympathetic nerves. These results suggest that sympathetic nerves are closely associated with pain and sympathetic-sensory coupling is likely in lower limb pain in both patients and rat models of CCD.展开更多
AIM To investigate whether the arcuate nucleus (ARC) could modulate gastric motility, and if so, what are the mechanisms or pathways.METHODS Wistar rats, anaesthetized with urethan, parameters of stimulation and elect...AIM To investigate whether the arcuate nucleus (ARC) could modulate gastric motility, and if so, what are the mechanisms or pathways.METHODS Wistar rats, anaesthetized with urethan, parameters of stimulation and electrolytic lesion sites were determined according to the Paxinos and Watson 'ATLAS of rat brain in steriotaxic coordinate'. Intragastric pressure (IGP) and gastric motility were measured by Reybould′s method.RESULTS Electrical stimulation of ARC could obviously decrease the IGP by 42.2%±5.4%, n=15, P＜0.01, and the phasic gastric contractions disappeared. The analysis showed that the locus coeruleus (LC) and dorsal raphe (DR) nuclei may be involved in central, but without the invovement of β-endorphinergic neurons rich in the ARC, while in periphery, the peripheral neural pathways are both vagus and sympathetic nerves. The fibers in vagus may be non-cholinergic. Humoral factors may also be involved. At the receptor level, Tonic action of adrenergic nerve in the stomach is mainly inhibitory; β-receptors, which may be present on the stomach wall and mediate inhibition; and α-receptors, which come into play through vagus, mediate inhibition, but those present on the smooth muscle mediate sympathetic excitation. Microinjection of TRH into ARC could significantly increase the IGP by 183.02% (0.53kPa±0.08kPa vs 1.5kPa±0.6kPa, n=10, P＜0.001), the rate and amplitude of phasic gastric contraction were also increased (3cpm vs 6cpm-8cpm). The peripheral pathway of such excitatory effects were transmitted with cholinergic vagus nerve mediated by M-receptor.CONCLUSION ARC could modulate gastric motility biphasically, inhibitory and excitatory, depending on the nature of stimuli.展开更多
Objective The relationship between compressed dorsal root ganglion （DRG） neurons and firing pattern and sensitivity of neurons was studied in chronically the Hindmarsh-Rose （HR） neuronal model. Methods Spontane- o...Objective The relationship between compressed dorsal root ganglion （DRG） neurons and firing pattern and sensitivity of neurons was studied in chronically the Hindmarsh-Rose （HR） neuronal model. Methods Spontane- ous activities from single fibers of chronically compressed DRG neurons in rats were recorded, and divided into periodic and non-periodic firing patterns. The sensitivity of the two kinds of firing pattern neuron to sympathetic stimulation （SS） was compared. Result It was found that 27.3% of periodic firing neurons and 93.2% of non-periodic firing neurons responded to SS respectively （ periodic vs non-periodic, P 〈 0.01 ）. The responses to SS with different stimulation time were greater non-periodic firing neurons than periodic firing neurons （P 〈 0.01 ）. The non-periodic firing neurons obviously responded to SS. After the firing pattern of these neurons transformed to periodic firing pattern, their responses to SS disappeared or decreased obviously. The HR neuronal model exhibited a significantly greater response to perturbation in non-periodic （chaotic） firing pattern than in periodic firing pattern. Conelusion The non-periodic firing neurons with deterministic chaos are more sensitive to external stimuli than the periodic firing neurons.展开更多
2008407 Effects of sympathetic nerve stimulation on connexin43 and ventricular arrhythmias during acute myocardial ischemia: experiment with rats. HU Xiaorong(胡笑容), et al. Dept Cardiol, Renmin Hosp, Wuhan Univ, Wuh...2008407 Effects of sympathetic nerve stimulation on connexin43 and ventricular arrhythmias during acute myocardial ischemia: experiment with rats. HU Xiaorong(胡笑容), et al. Dept Cardiol, Renmin Hosp, Wuhan Univ, Wuhan 430060. Natl Med J China 2008;88(24):1707-1710. Objective To investigate the effects of sympathetic nerve stimulation (SNS) on connexin43 (Cx43) and ventricular arrhythmias during acute myocardial ischemia (MI).展开更多
It is well known that main viscera generally receive dual innervation from sympathetic and parasympathetic nerves and their roles modulating activities of viscora show antagonism in physiological nature, but there is ...It is well known that main viscera generally receive dual innervation from sympathetic and parasympathetic nerves and their roles modulating activities of viscora show antagonism in physiological nature, but there is little information about where展开更多
Background:A common assumption with autonomic assessment is that one branch opposes the other.With independent measures of parasympathetic (P) and sympathetic (S) ac tivity,based on concurrent time-frequency analysis ...Background:A common assumption with autonomic assessment is that one branch opposes the other.With independent measures of parasympathetic (P) and sympathetic (S) ac tivity,based on concurrent time-frequency analysis of respiratory activity and heart rate variability,this assumption has been challenged.Clinical observations of unprovoked P-excess during S-stimulation have been associated with treatable,abnormal responses.Method:Serial autonomic profiling of 12,967 patients was performed using the P&S method (ANX-3.0 Autonomic Monitor by ANSAR Medical Technologies,Inc.,Philadelphia,PA) over a five-year period.Treatment protocols are very low-dose and depend on patient history.For cardiovascular disease patients,Carvedilol was prescribed.For non-CVD patients,Nortriptyline was prescribed.In some cases where end-organ effects were not yet presented or relieved,patients were weaned of therapy once PE was relieved.Alternative therapies included Specific Chiropractic Adjustment,better known in the literature as Chiropractic Manipulative Therapy and intensive zero-impact,cardiovascular exercise.Results:PE patients present with normal HR and BP and no other apparent symptoms at rest.However,they reported symptoms of:sleep difficulties,palpitations,poor peripheral circulation,general malaise,depression (often with anxiety or ADD-like symptoms),frequent headache or migraines,menopause difficulties in women,hypothyroidism,cognitive difficulties,gastrointestinal upset,persistent weight-gain,and dizziness after standing.Conclusion:Normalizing PE,regardless of method,stabilizes the patient,relieves symptoms,improves quality of life,and improves patient outcomes.展开更多
Recent studies on neuroanatomy have demonstrated that the sympathetic pregan-glionie neurons in the intermediolateral cell column of the spinal cord and parasympa-thetic preganglionic neurons in the medulla are main s...Recent studies on neuroanatomy have demonstrated that the sympathetic pregan-glionie neurons in the intermediolateral cell column of the spinal cord and parasympa-thetic preganglionic neurons in the medulla are main sites of the termination of monoamine-containing neurons, especially noradrenergie neurons (NA-neuron) and seroto-nergic neurons (5-HT-neuron), of which the cell bodies are situated in the caudal brainstem. Dense monoaminergic terminations in the primary autonomic centers suggested that they might play some important physiological actions. In this study, anattempt is made to study the influence of the monoaminergic neurons in the caudal brain stem on the outflows of sympathetic and parasympathetic neurons.展开更多
The centrifugal control of exteroceptors, particularly the efferent influence of sympathetic nerves on receptors has been well documented. Loewenstein and Chernetski observed that the activity of tactile receptors of ...The centrifugal control of exteroceptors, particularly the efferent influence of sympathetic nerves on receptors has been well documented. Loewenstein and Chernetski observed that the activity of tactile receptors of the skin could be facilitated by sympathetic nerves. Santini et al. recently confirmed that the sympathetic nerves were distributed to the vicinity of sensory nerve endings, and the afferent展开更多
基金Supported by National Natural Science Foundation of China, No. 39970242
文摘Objective: To study sympathetic-sensory coupling in chronically compressed dorsal root ganglion (DRG) neurons in rats. Methods: In chronically compressed DRG model, the spontaneous activity of single fiber from the injured DRG neuron was recorded, and lumbar sympathetic trunk was electrical stimulated to study the sympathetic modulation of spontaneous activities in injured DRG neurons. Results: Fifty-seven percent of spontaneous active neurons of injured DRG responded to sympathetic stimulation. The responses included simple excitation, excitation followed by inhibition and simple inhibition. The responses enhanced with the increase of sympathetic stimulation time. The responses to sympathetic stimula- tion could be blocked by intravenously injection of phentolamine, a-adrenorecepor antagonist. Fifty-three percent of injured DRG responded to norepinephrine (NE). The responses to NE were similar to those induced by sympathetic stimulation. Conclusion: Sympathetic-sensory coupling is virtually present in chronic compressed DRG neurons. NE released from sympathetic nerve terminals acts on a-adrenorecepor to influence spontaneous activities of injured DRG neurons.
基金the Natural Science Foundation of Guangdong Province,No. 05300503
文摘Previous studies have shown that sympathetic nerves are related to certain types of pain, and this phenomenon is referred to as sympathetic-sensory coupling. Chronic pain resulting from nerve injury can be exacerbated by sympathetic stimulation or relieved by sympathetic inhibition. In the present study, the correlation between pain and sympathetic nerves was analyzed in patients with severe pain in lower limbs, as we^l as in a chronically compressed dorsa~ root ganglion ~CCD） rat model （model of low back pain and sciatica）. Patients with severe pain in the lower limbs underwent chemical lumbar sympathectomy （CLS）, and the analgesic effects of CLS were compared with painkillers. Results demonstrated significantly relieved lower limb pain following CLS, and the analgesic effects of CLS were superior to those seen with painkillers. In the CCD rat model, dorsal root ganglion neuronal activity significantly increased as a result of electrical stimulation to the sympathetic nerves. These results suggest that sympathetic nerves are closely associated with pain and sympathetic-sensory coupling is likely in lower limb pain in both patients and rat models of CCD.
文摘AIM To investigate whether the arcuate nucleus (ARC) could modulate gastric motility, and if so, what are the mechanisms or pathways.METHODS Wistar rats, anaesthetized with urethan, parameters of stimulation and electrolytic lesion sites were determined according to the Paxinos and Watson 'ATLAS of rat brain in steriotaxic coordinate'. Intragastric pressure (IGP) and gastric motility were measured by Reybould′s method.RESULTS Electrical stimulation of ARC could obviously decrease the IGP by 42.2%±5.4%, n=15, P＜0.01, and the phasic gastric contractions disappeared. The analysis showed that the locus coeruleus (LC) and dorsal raphe (DR) nuclei may be involved in central, but without the invovement of β-endorphinergic neurons rich in the ARC, while in periphery, the peripheral neural pathways are both vagus and sympathetic nerves. The fibers in vagus may be non-cholinergic. Humoral factors may also be involved. At the receptor level, Tonic action of adrenergic nerve in the stomach is mainly inhibitory; β-receptors, which may be present on the stomach wall and mediate inhibition; and α-receptors, which come into play through vagus, mediate inhibition, but those present on the smooth muscle mediate sympathetic excitation. Microinjection of TRH into ARC could significantly increase the IGP by 183.02% (0.53kPa±0.08kPa vs 1.5kPa±0.6kPa, n=10, P＜0.001), the rate and amplitude of phasic gastric contraction were also increased (3cpm vs 6cpm-8cpm). The peripheral pathway of such excitatory effects were transmitted with cholinergic vagus nerve mediated by M-receptor.CONCLUSION ARC could modulate gastric motility biphasically, inhibitory and excitatory, depending on the nature of stimuli.
基金This work was supported by the National Natural Science Foundation of China （30030040）.
文摘Objective The relationship between compressed dorsal root ganglion （DRG） neurons and firing pattern and sensitivity of neurons was studied in chronically the Hindmarsh-Rose （HR） neuronal model. Methods Spontane- ous activities from single fibers of chronically compressed DRG neurons in rats were recorded, and divided into periodic and non-periodic firing patterns. The sensitivity of the two kinds of firing pattern neuron to sympathetic stimulation （SS） was compared. Result It was found that 27.3% of periodic firing neurons and 93.2% of non-periodic firing neurons responded to SS respectively （ periodic vs non-periodic, P 〈 0.01 ）. The responses to SS with different stimulation time were greater non-periodic firing neurons than periodic firing neurons （P 〈 0.01 ）. The non-periodic firing neurons obviously responded to SS. After the firing pattern of these neurons transformed to periodic firing pattern, their responses to SS disappeared or decreased obviously. The HR neuronal model exhibited a significantly greater response to perturbation in non-periodic （chaotic） firing pattern than in periodic firing pattern. Conelusion The non-periodic firing neurons with deterministic chaos are more sensitive to external stimuli than the periodic firing neurons.
文摘2008407 Effects of sympathetic nerve stimulation on connexin43 and ventricular arrhythmias during acute myocardial ischemia: experiment with rats. HU Xiaorong(胡笑容), et al. Dept Cardiol, Renmin Hosp, Wuhan Univ, Wuhan 430060. Natl Med J China 2008;88(24):1707-1710. Objective To investigate the effects of sympathetic nerve stimulation (SNS) on connexin43 (Cx43) and ventricular arrhythmias during acute myocardial ischemia (MI).
基金Project supported by the Science Fund of Academia Sinica
文摘It is well known that main viscera generally receive dual innervation from sympathetic and parasympathetic nerves and their roles modulating activities of viscora show antagonism in physiological nature, but there is little information about where
文摘Background:A common assumption with autonomic assessment is that one branch opposes the other.With independent measures of parasympathetic (P) and sympathetic (S) ac tivity,based on concurrent time-frequency analysis of respiratory activity and heart rate variability,this assumption has been challenged.Clinical observations of unprovoked P-excess during S-stimulation have been associated with treatable,abnormal responses.Method:Serial autonomic profiling of 12,967 patients was performed using the P&S method (ANX-3.0 Autonomic Monitor by ANSAR Medical Technologies,Inc.,Philadelphia,PA) over a five-year period.Treatment protocols are very low-dose and depend on patient history.For cardiovascular disease patients,Carvedilol was prescribed.For non-CVD patients,Nortriptyline was prescribed.In some cases where end-organ effects were not yet presented or relieved,patients were weaned of therapy once PE was relieved.Alternative therapies included Specific Chiropractic Adjustment,better known in the literature as Chiropractic Manipulative Therapy and intensive zero-impact,cardiovascular exercise.Results:PE patients present with normal HR and BP and no other apparent symptoms at rest.However,they reported symptoms of:sleep difficulties,palpitations,poor peripheral circulation,general malaise,depression (often with anxiety or ADD-like symptoms),frequent headache or migraines,menopause difficulties in women,hypothyroidism,cognitive difficulties,gastrointestinal upset,persistent weight-gain,and dizziness after standing.Conclusion:Normalizing PE,regardless of method,stabilizes the patient,relieves symptoms,improves quality of life,and improves patient outcomes.
文摘Recent studies on neuroanatomy have demonstrated that the sympathetic pregan-glionie neurons in the intermediolateral cell column of the spinal cord and parasympa-thetic preganglionic neurons in the medulla are main sites of the termination of monoamine-containing neurons, especially noradrenergie neurons (NA-neuron) and seroto-nergic neurons (5-HT-neuron), of which the cell bodies are situated in the caudal brainstem. Dense monoaminergic terminations in the primary autonomic centers suggested that they might play some important physiological actions. In this study, anattempt is made to study the influence of the monoaminergic neurons in the caudal brain stem on the outflows of sympathetic and parasympathetic neurons.
文摘The centrifugal control of exteroceptors, particularly the efferent influence of sympathetic nerves on receptors has been well documented. Loewenstein and Chernetski observed that the activity of tactile receptors of the skin could be facilitated by sympathetic nerves. Santini et al. recently confirmed that the sympathetic nerves were distributed to the vicinity of sensory nerve endings, and the afferent
