The thalamostriatal pathway is implicated in Parkinson's disease(PD); however, PD-related changes in the relationship between oscillatory activity in the centromedian-parafascicular complex(CM/Pf, or the Pf in rod...The thalamostriatal pathway is implicated in Parkinson's disease(PD); however, PD-related changes in the relationship between oscillatory activity in the centromedian-parafascicular complex(CM/Pf, or the Pf in rodents) and the dorsal striatum(DS) remain unclear.Therefore, we simultaneously recorded local field potentials(LFPs) in both the Pf and DS of hemiparkinsonian and control rats during epochs of rest or treadmill walking. The dopamine-lesioned rats showed increased LFP power in the beta band(12 Hz–35 Hz) in the Pf and DS during both epochs, but decreased LFP power in the delta(0.5 Hz–3 Hz) band in the Pf during rest epochs and in the DS during both epochs, compared to control rats. In addition,exaggerated low gamma(35 Hz–70 Hz) oscillations after dopamine loss were restricted to the Pf regardless of the behavioral state. Furthermore, enhanced synchronization of LFP oscillations was found between the Pf and DS after the dopamine lesion. Significant increases occurred in the mean coherence in both theta(3 Hz–7 Hz) and beta bands,and a significant increase was also noted in the phase coherence in the beta band between the Pf and DS during rest epochs. During the treadmill walking epochs, significant increases were found in both the alpha(7 Hz–12 Hz)and beta bands for two coherence measures. Collectively,dramatic changes in the relative LFP power and coherence in the thalamostriatal pathway may underlie the dysfunction of the basal ganglia-thalamocortical network circuits in PD, contributing to some of the motor and non-motor symptoms of the disease.展开更多
The present study was undertaken to investigate whether M-cholinoceptors in caudate nucleus (Cd) were implicated in cortical sensorimotor area I (SmI) originating descending modulation of activities in thalamic parafa...The present study was undertaken to investigate whether M-cholinoceptors in caudate nucleus (Cd) were implicated in cortical sensorimotor area I (SmI) originating descending modulation of activities in thalamic parafascicular nuclei (Pf) in acupuncture analgesia (AA). It was found that following bilateral microinjection of atropine into Cd head electroacupuncture (EA) (n=12) or glutamate (Glu) applied at SmI (n=12) did not affect the nociceptive responses of Pf neurons (P>0. 05),while in the saline control groups EA (n=11) or Glu at SmI (n=12) obviously inhibited nociceptive responses of Pf neurons (P<0. 05). There were significant differences in the effect of EA or Glu at SmI between atropine and saline groups (ANOVA, P<0. 05). Together with our previous findings demonstrating the participation of SmI originating descending modulation of Pf neurons in AA, the present investigation indicates that M-cholinoceptors are involved in mediating SmI originating descending modulation of Pf neurons in AA.展开更多
BACKGROUND： Vagal nerve fibers have many projections to the central nervous system. The anti-epileptic effects of vagus nerve stimulation （VNS） are associated with the thalamus, insular cortex, and other brain regi...BACKGROUND： Vagal nerve fibers have many projections to the central nervous system. The anti-epileptic effects of vagus nerve stimulation （VNS） are associated with the thalamus, insular cortex, and other brain regions. OBJECTIVE： To validate the inhibitory effects of vagus nerve stimulation on firing activities of parafascicular nucleus （Pf） neurons in rats. DESIGN, TIME, AND SETTING： The experiment was performed in the Electrophysiological Laboratory of Department of Neurobiology, Liaoning Medical University between September 2006 and September 2007 with multiple-factor self-controlled design. MATERIALS： Twenty-two healthy adult male Sprague Dawley rats were obtained for this experiment. Main instruments： A320R constant electrical stimulation was made by United States World Precision Instruments, Spike2 Biological Signal Processing Systems was provided by British CED Company. METHODS： Under general anesthesia, the left cervical vagus nerve of rats was separated by approximately 1.0 cm. A stimulation electrode was deployed on the vagus nerve, with various settings for VNS parameters. MAIN OUTCOME MEASURES： ① Firing rates of Pf before and after various VNS parameters were measured according to effect （R） ≥ 20%： excited effect, R ≤ -20%： inhibited effect, -20% 〈 R 〈 20%： no effect. ② Firing rates of excited Pf neurons after various VNS parameters were measured. RESULTS： ① One rat died prior to recording, another was recorded in the wrong brain location, but the remaining 20 rats were included in the final analysis. ② A total of 221 Pf neurons in healthy rats were recorded. The spontaneous firing rats were （6.70 ± 0.56） Hz and varied between 0.34-52.5 Hz. The spontaneous firing rates were significantly increased in 146 neurons （66.1%）, increasing from （5.36 ± 0.59） Hz to （8.22 ± 0.81） Hz （P 〈 0.01）. A total of 40 （18.1%） neurons did not respond, and 35 （15.8%） neurons were inhibited. ③ The excitation rates of Pf neurons did not increase with increasing current intensity from 3.0 mA to 5.0 mA. ④ When the current intensity was set to 3.0-4.0 mA, excitation rates of Pf neurons decreased with increasing stimulation frequency of 30 -50 Hz. The excitation ratios were not reduced by an intensity of 5.0 mA. CONCLUSION： VNS may result in excited Pf neurons that may inhibit cerebral cortical activities.展开更多
Many research works through out the world show that the preoptic area(POA) is a region concerned with analgesia. Electric stimulation to this region could enhance markedly pain threshold and exert an analgesic effect....Many research works through out the world show that the preoptic area(POA) is a region concerned with analgesia. Electric stimulation to this region could enhance markedly pain threshold and exert an analgesic effect. Central 5-hydroxytryptamine (5-HT) plays an important role in pain mediation. Acupuncture could accelerate the synthe-展开更多
基金supported by the Science Technological Project of Shandong Province (2018CXGC1502 and 2016GSF201058)the National Natural Science Foundation of China (31571104 and 81501149)
文摘The thalamostriatal pathway is implicated in Parkinson's disease(PD); however, PD-related changes in the relationship between oscillatory activity in the centromedian-parafascicular complex(CM/Pf, or the Pf in rodents) and the dorsal striatum(DS) remain unclear.Therefore, we simultaneously recorded local field potentials(LFPs) in both the Pf and DS of hemiparkinsonian and control rats during epochs of rest or treadmill walking. The dopamine-lesioned rats showed increased LFP power in the beta band(12 Hz–35 Hz) in the Pf and DS during both epochs, but decreased LFP power in the delta(0.5 Hz–3 Hz) band in the Pf during rest epochs and in the DS during both epochs, compared to control rats. In addition,exaggerated low gamma(35 Hz–70 Hz) oscillations after dopamine loss were restricted to the Pf regardless of the behavioral state. Furthermore, enhanced synchronization of LFP oscillations was found between the Pf and DS after the dopamine lesion. Significant increases occurred in the mean coherence in both theta(3 Hz–7 Hz) and beta bands,and a significant increase was also noted in the phase coherence in the beta band between the Pf and DS during rest epochs. During the treadmill walking epochs, significant increases were found in both the alpha(7 Hz–12 Hz)and beta bands for two coherence measures. Collectively,dramatic changes in the relative LFP power and coherence in the thalamostriatal pathway may underlie the dysfunction of the basal ganglia-thalamocortical network circuits in PD, contributing to some of the motor and non-motor symptoms of the disease.
文摘The present study was undertaken to investigate whether M-cholinoceptors in caudate nucleus (Cd) were implicated in cortical sensorimotor area I (SmI) originating descending modulation of activities in thalamic parafascicular nuclei (Pf) in acupuncture analgesia (AA). It was found that following bilateral microinjection of atropine into Cd head electroacupuncture (EA) (n=12) or glutamate (Glu) applied at SmI (n=12) did not affect the nociceptive responses of Pf neurons (P>0. 05),while in the saline control groups EA (n=11) or Glu at SmI (n=12) obviously inhibited nociceptive responses of Pf neurons (P<0. 05). There were significant differences in the effect of EA or Glu at SmI between atropine and saline groups (ANOVA, P<0. 05). Together with our previous findings demonstrating the participation of SmI originating descending modulation of Pf neurons in AA, the present investigation indicates that M-cholinoceptors are involved in mediating SmI originating descending modulation of Pf neurons in AA.
文摘BACKGROUND： Vagal nerve fibers have many projections to the central nervous system. The anti-epileptic effects of vagus nerve stimulation （VNS） are associated with the thalamus, insular cortex, and other brain regions. OBJECTIVE： To validate the inhibitory effects of vagus nerve stimulation on firing activities of parafascicular nucleus （Pf） neurons in rats. DESIGN, TIME, AND SETTING： The experiment was performed in the Electrophysiological Laboratory of Department of Neurobiology, Liaoning Medical University between September 2006 and September 2007 with multiple-factor self-controlled design. MATERIALS： Twenty-two healthy adult male Sprague Dawley rats were obtained for this experiment. Main instruments： A320R constant electrical stimulation was made by United States World Precision Instruments, Spike2 Biological Signal Processing Systems was provided by British CED Company. METHODS： Under general anesthesia, the left cervical vagus nerve of rats was separated by approximately 1.0 cm. A stimulation electrode was deployed on the vagus nerve, with various settings for VNS parameters. MAIN OUTCOME MEASURES： ① Firing rates of Pf before and after various VNS parameters were measured according to effect （R） ≥ 20%： excited effect, R ≤ -20%： inhibited effect, -20% 〈 R 〈 20%： no effect. ② Firing rates of excited Pf neurons after various VNS parameters were measured. RESULTS： ① One rat died prior to recording, another was recorded in the wrong brain location, but the remaining 20 rats were included in the final analysis. ② A total of 221 Pf neurons in healthy rats were recorded. The spontaneous firing rats were （6.70 ± 0.56） Hz and varied between 0.34-52.5 Hz. The spontaneous firing rates were significantly increased in 146 neurons （66.1%）, increasing from （5.36 ± 0.59） Hz to （8.22 ± 0.81） Hz （P 〈 0.01）. A total of 40 （18.1%） neurons did not respond, and 35 （15.8%） neurons were inhibited. ③ The excitation rates of Pf neurons did not increase with increasing current intensity from 3.0 mA to 5.0 mA. ④ When the current intensity was set to 3.0-4.0 mA, excitation rates of Pf neurons decreased with increasing stimulation frequency of 30 -50 Hz. The excitation ratios were not reduced by an intensity of 5.0 mA. CONCLUSION： VNS may result in excited Pf neurons that may inhibit cerebral cortical activities.
文摘Many research works through out the world show that the preoptic area(POA) is a region concerned with analgesia. Electric stimulation to this region could enhance markedly pain threshold and exert an analgesic effect. Central 5-hydroxytryptamine (5-HT) plays an important role in pain mediation. Acupuncture could accelerate the synthe-
