摘要
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.
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.
