The immediate early gene c fos is rapidly and transiently expressed in neurons in response to stimulation. The aim of the present study is to observe the effec ts of acupuncture on c fos expression of periaqueductal g...The immediate early gene c fos is rapidly and transiently expressed in neurons in response to stimulation. The aim of the present study is to observe the effec ts of acupuncture on c fos expression of periaqueductal gray(PAG), nucleus raph e magnus (NRM)and dorsal raphe nucleus(DRN) in carrageenan inflammation rats.Rats were divided into control, carrageenan inflammation and acupuncture groups. Except control group, each rat was received a unilateral injection of carrageen an (Sigma, 2 mg/100 μL per paw) into the hind paw. The results showed that the nociceptive threshold of control and inflammation rats were 13.34±2.11 sec and 1.74±0.22 sec indicating that the hyperalgesia was induced by carrageena n. The number of the labeled Fos LI neurons in PAG, NRM and DRN was significant ly increased (18.90±1.79 to 44.25±2.91, P<0.001, 2.57±0.84 to 9.60 ±1.88, P<0.05 and 15.33±1.59 to 31.39±3.55,P<0.001 ,respe ctively). Electroacupuncture (EA) unilateral "Zusanli"(ST 36) and "Kunlun"(BL 60) acupoints(2 and 60 Hz alternately,1～ 3 mA, 30 min) significantly elevated the nociceptive threshold of the carrageena n injected paws(P<0.05). At the same time, in the EA treated rats the number of labeled Fos LI neurons was significantly decreased in PAG and DRN (44 .25±2.91 to 17.86±1.63,P<0.01, 31.39±3.55 to 18.27±2.02,P< 0.05), but not in NRM(9.60±1.88 to 8.83±2.21,P>0.05). The re sults indicate that the EA supressed the carrageenan inflammation induced Fos ex pression in PAG and DRN, but not in NRM in rats.展开更多
Interleukin 1β has been reported to be involved in pain modulation in central n ervous systems. As the spinal cord is a major region in which nociceptive input is processed and modulated, we examined the effect of in...Interleukin 1β has been reported to be involved in pain modulation in central n ervous systems. As the spinal cord is a major region in which nociceptive input is processed and modulated, we examined the effect of intrathecal injection of i nterleukin 1β on the nociception in carrageenan injected rats using behavior a nd Fos study. The results showed that: ① intrathecally administered interleu kin 1β (1 ng,10 ng and 100 ng) could dose dependently increase the thermal n ociceptive threshold of carrageenan inflammed rats. Intrathecally administered interleukin 1β 10 ng could significantly increase the paw withdrawal latency , peaked at 15 min and lasted for more than 30 min. Electroacupuncture (EA) unilat eral (ipsilateral to carrageenan injection paw) "Zusanli"(ST 36) and "Kunlun "(BL 60) acupoints (2 and 60 Hz alternately,1～3 mA,30 min) significantly eleva ted the nociception threshold of the carrageenan injected paws. When 10 ng inte rleukin 1β was intrathecally injected 5 min before the beginning of EA, the ef fect of EA analgesia was markedly potentiated. ② The number of Fos LI neurons in the ipsilateral spinal dorsal horn was significantly increased in laminae Ⅰ ～Ⅱ and laminae Ⅴ～Ⅵ in carrageenan injected rats. Intrathecal administratio n of interleukin 1β could suppress the expression of Fos LI in laminae Ⅰ～Ⅱ , but not in laminae Ⅲ～Ⅳ or laminae Ⅴ～Ⅵ. The number of Fos LI positive n eurons both in laminae Ⅰ～Ⅱ and in laminae Ⅴ～Ⅵ in EA treated rats was sign ificantly less than that of vehicle treated rats. When 10 ng interleukin 1β wa s intrathecally injected 5 min before the beginning of EA, the number of Fos LI positive neurons both in laminae Ⅰ～Ⅱ and in laminae Ⅴ～Ⅵ was markedly le ss than either of those in EA treated rats or in interleukin 1β treated rats. The results suggest that interleukin 1β in spinal level could produce antinoci ceptive effect and strengthen acupuncture analgesia in inflammatory rat.展开更多
In the previous work, we found that DAD 2 receptors in the spinal cord could me diat e significant anti hyperalgesic effect. But the mechanism is not clear. In the present experiments, the intrathecal injection and fl...In the previous work, we found that DAD 2 receptors in the spinal cord could me diat e significant anti hyperalgesic effect. But the mechanism is not clear. In the present experiments, the intrathecal injection and fluorescent in situ hybridiza tion (FISH) wi th fluorescentimmunohistochemical (FIH) double staining were used to observe the possible relationship between the anti hyperalgesic effects mediated by D 2 r eceptors and central opioid system. First, the effect of i.t. 5 mM naloxone on the anti hyperalgesia of i.t. D 2 rec eptor agonist LY171555 was examined, the results showed that naloxone produced c omplete antagonism on the anti hyperalgesia mediated by D 2 receptors in the s pinal cord, and suggested that opioid receptors may be activated when the D 2 r eceptors in the spinal cord mediated anti hyperalgesia. FISH with FIH double staining was used to look for the direct relationship betwe en D 2 receptors and the opioid system in the spinal cord. In dorsal horn, we o bserved the colocalization of D 2 mRNA and ENK neurons. The results showed that D 2 receptor mRNA and ENK IR double labeled cells were significantly increas ed at 8 hr after i.t. carrageenan. From these results, we concluded that the anti hyperalgesic effect mediat ed by D 2 receptors in the spinal cord is related to the opioid system, D 2 r eceptors may produce a direct action on ENK interneurons.展开更多
文摘The immediate early gene c fos is rapidly and transiently expressed in neurons in response to stimulation. The aim of the present study is to observe the effec ts of acupuncture on c fos expression of periaqueductal gray(PAG), nucleus raph e magnus (NRM)and dorsal raphe nucleus(DRN) in carrageenan inflammation rats.Rats were divided into control, carrageenan inflammation and acupuncture groups. Except control group, each rat was received a unilateral injection of carrageen an (Sigma, 2 mg/100 μL per paw) into the hind paw. The results showed that the nociceptive threshold of control and inflammation rats were 13.34±2.11 sec and 1.74±0.22 sec indicating that the hyperalgesia was induced by carrageena n. The number of the labeled Fos LI neurons in PAG, NRM and DRN was significant ly increased (18.90±1.79 to 44.25±2.91, P<0.001, 2.57±0.84 to 9.60 ±1.88, P<0.05 and 15.33±1.59 to 31.39±3.55,P<0.001 ,respe ctively). Electroacupuncture (EA) unilateral "Zusanli"(ST 36) and "Kunlun"(BL 60) acupoints(2 and 60 Hz alternately,1～ 3 mA, 30 min) significantly elevated the nociceptive threshold of the carrageena n injected paws(P<0.05). At the same time, in the EA treated rats the number of labeled Fos LI neurons was significantly decreased in PAG and DRN (44 .25±2.91 to 17.86±1.63,P<0.01, 31.39±3.55 to 18.27±2.02,P< 0.05), but not in NRM(9.60±1.88 to 8.83±2.21,P>0.05). The re sults indicate that the EA supressed the carrageenan inflammation induced Fos ex pression in PAG and DRN, but not in NRM in rats.
文摘Interleukin 1β has been reported to be involved in pain modulation in central n ervous systems. As the spinal cord is a major region in which nociceptive input is processed and modulated, we examined the effect of intrathecal injection of i nterleukin 1β on the nociception in carrageenan injected rats using behavior a nd Fos study. The results showed that: ① intrathecally administered interleu kin 1β (1 ng,10 ng and 100 ng) could dose dependently increase the thermal n ociceptive threshold of carrageenan inflammed rats. Intrathecally administered interleukin 1β 10 ng could significantly increase the paw withdrawal latency , peaked at 15 min and lasted for more than 30 min. Electroacupuncture (EA) unilat eral (ipsilateral to carrageenan injection paw) "Zusanli"(ST 36) and "Kunlun "(BL 60) acupoints (2 and 60 Hz alternately,1～3 mA,30 min) significantly eleva ted the nociception threshold of the carrageenan injected paws. When 10 ng inte rleukin 1β was intrathecally injected 5 min before the beginning of EA, the ef fect of EA analgesia was markedly potentiated. ② The number of Fos LI neurons in the ipsilateral spinal dorsal horn was significantly increased in laminae Ⅰ ～Ⅱ and laminae Ⅴ～Ⅵ in carrageenan injected rats. Intrathecal administratio n of interleukin 1β could suppress the expression of Fos LI in laminae Ⅰ～Ⅱ , but not in laminae Ⅲ～Ⅳ or laminae Ⅴ～Ⅵ. The number of Fos LI positive n eurons both in laminae Ⅰ～Ⅱ and in laminae Ⅴ～Ⅵ in EA treated rats was sign ificantly less than that of vehicle treated rats. When 10 ng interleukin 1β wa s intrathecally injected 5 min before the beginning of EA, the number of Fos LI positive neurons both in laminae Ⅰ～Ⅱ and in laminae Ⅴ～Ⅵ was markedly le ss than either of those in EA treated rats or in interleukin 1β treated rats. The results suggest that interleukin 1β in spinal level could produce antinoci ceptive effect and strengthen acupuncture analgesia in inflammatory rat.
文摘In the previous work, we found that DAD 2 receptors in the spinal cord could me diat e significant anti hyperalgesic effect. But the mechanism is not clear. In the present experiments, the intrathecal injection and fluorescent in situ hybridiza tion (FISH) wi th fluorescentimmunohistochemical (FIH) double staining were used to observe the possible relationship between the anti hyperalgesic effects mediated by D 2 r eceptors and central opioid system. First, the effect of i.t. 5 mM naloxone on the anti hyperalgesia of i.t. D 2 rec eptor agonist LY171555 was examined, the results showed that naloxone produced c omplete antagonism on the anti hyperalgesia mediated by D 2 receptors in the s pinal cord, and suggested that opioid receptors may be activated when the D 2 r eceptors in the spinal cord mediated anti hyperalgesia. FISH with FIH double staining was used to look for the direct relationship betwe en D 2 receptors and the opioid system in the spinal cord. In dorsal horn, we o bserved the colocalization of D 2 mRNA and ENK neurons. The results showed that D 2 receptor mRNA and ENK IR double labeled cells were significantly increas ed at 8 hr after i.t. carrageenan. From these results, we concluded that the anti hyperalgesic effect mediat ed by D 2 receptors in the spinal cord is related to the opioid system, D 2 r eceptors may produce a direct action on ENK interneurons.
