Objectives : This study was carried out to evaluate analgesic effects of Zanthoxylum bungeanum Maxim (ZM) pharmacopuncture on formalin-induced pains in Sprague-Dawley (SD) rats and ICR-mice. Methods : The subjects were divided 8 weeks aged rats with constant pain sensitivity into five groups; normal (treated with normal saline at Taegye (KI3) and before injected with normal saline at hindpaw), Con-1 (treated with normal saline at KI3 before injected with formalin at hindpaw), Lido-1 (treated with lidocaine at KI3), ZMWG-1 (treated with Hot water extraction pharmacopuncture of Zanthoxylum bungeanum Maxim at KI3), ZMEG-1 (treated with ethanol extraction pharmacopuncture of Zanthoxylum bungeanum Maxim at KI3). After 35 minutes, we measured ultrasonic vocalization (USV) and enzyme activities of both Aspartate aminotransferase (AST), Alanine aminotransferase (ALT) in rat serum. In addition, Tail flick test is performed by injecting ICR mice at 5 weeks of age. And it classified into 4 groups (Con-2, Lido-2, ZMWG-2, ZMEG-2) according to the kind of drug (normal saline, lidocaine, ZMW, ZME). After each drug injection, we examined the reaction by placing the tail in water at $50^{\circ}C$. Results : ZME had analgesic effects in the early and late phase of USV during the formalin test. There were no significant differences between ZMEG-1 and Lido-1 in early and late phase of USV. Also, No significant differences observed in serum AST and ALT activity in ZMWG-1 and ZMEG-1 compared with Con-1. For tail-flick test, analgesic effect on warmth significantly increased in Lido-2 and ZMEG-2 compare to that of Con-2. Conclusion : ZME pharmacopuncture had analgesic effects on formalin-induced pain without liver toxicity. Also, tail-flick test suggest that ZME pharmacopuncture could be useful technique on analgesic effect on warmth and treatment of pains.
Objective : In the present study, the effect of electroacupuncture (EA) applied to several acupoints and non-acupoint in CFA-induced knee arthritis was examined. Methods : A common source of persistent pain in humans is arthritis. Arthritis was induced by injection of CFA $125\;{\mu}l$ into knee joint cavity under enflurane anesthesia. The rat subsequently showed swelling of the ankle and a reduced stepping force of the affected limb for the next several days. The reduced stepping force of the limb was presumably due to a painful knee. EA was applied to either of $LR_2,\;LI_4$, or non-acupoint on the contralateral forelimb for 30 min under gaseous anesthesia. After the termination of EA, behavioral tests measuring stepping force were periodically conducted during the next 4 h. Results : EA applied to $LR_2$ point produced a significant improvement of stepping force of the affected foot lasting for at least 2 h. However, neigher $LI_4$ point nor non-point produced any significant increase of weight bearing force. The improvement of stepping pressure was interpreted as an analgesic effect. The analgesic effect was specific to the acupuncture point since the analgesic effect on CFA-induced knee arthritic pain model could not be mimicked by EA applied to a point, $LI_4$ or non-acupoint. In addition, both NO production and iNOS protein expression increased by arthritis were suppressed by EA applied to $LR_2$ point. Conclusion : These data suggest that EA produces a potent analgesic effect in the rat model of CFA-induced knee arthritis. This analgesic effect is produced by applying EA to an acupoint at opposite side from the painful area in a stimulus point-specific way.
Objective : Sono-acupoint (SA) therapy is a new therapeutic technique that combined with acupuncture points, herbal medicine and ultrasound therapy. This study was carried out to investigate the analgesic and anti-inflammatory effects of sono-acupoint therapy. Methods : We performed the tail-flick test with normal rats to examine the tail-flick latency (TFL), and the Freund's adjuvant-induced arthritis rat model to examine the edema, skin temperature and serum concentration of c-reactive protein and rheumatoid factor (RF). Herbal SA (HSA) treatment was performed at bilateral Zusanli (ST36) with the hanbang-gel made of several selected herbal drugs in Sprague-Dawley rats (male, $250{\pm}30g$). General SA (GSA) treatment was performed at bilateral Zusanli (ST36) with the gel used in ultrasound therapy. In arthritis rat model, Freund's adjuvant (50mg/ml) was injected in dorsal part of right foot, and these treatments were performed after 15 days. Results : TFL was lengthened after SA treatments. Skin temperature and RF concentration that were the evidence of arthritis in rats were decreased by HSA treatment (P < 0.05). Conclusion : These results indicate that HSA has the analgesic and anti-inflammatory effects in rats, and further developments will produce the advance of this new therapeutic skill.
Objectives : To investigate the role of Meridian flow on acupuncture effect, we observed the therapeutic effects of electroacupuncture (EA) after Meridian blocking with pressure in arthritic rats. Methods : To make reliable and local monoarthritis, $40{\;}{\mu}l$ complete Freund's adjuvant was injected into the tibio-tarsal joint. EA was applied on acupoint GB30 while 5 Pascal pressure was added to the middle of the Gall bladder Meridian around GB31 between acupoint GB30 and arthritic foci (ipsilateral meridian blocking: IB) or opposite part of IB (contralateral part blocking: CB). To observe the change of arthritis, extension and flexion pain scores and circumferential differences were evaluated once a week. Results : EA stimulation without blocking reduced arthritic pain significantly. IB abolished the acupuncture effects and there was no statistical difference with the arthritic control group, whereas the CB group still showed the therapeutic effects of acupuncture. Conclusions : This finding strongly supports that the Meridian blocking with local pressure reduced the therapeutic effect of EA.
Awareness effect of aquapuncture with dexamethasone on GV-26 was studied in tiletamine/zolazapam anesthetized six healthy crossbred dogs using a randomized cross-over experimental study design. After anesthesia by tiletamine/zolazapam, 0.1 mg dexamethasone was injected on GV-26 at 20 min in the experimental group. For the control group, 0.1 mg dexamethasone was injected on the quadriceps femoralis. A significant difference was evident in the sedation score between groups at 60 and 90 min (p < 0.05). A significant difference was also evident in the analgesia score at 50 and 60 min (p < 0.05). At 90 min, all dogs in the experimental group responded strongly to pain (p < 0.01). Head up time, sternal recumbent time, standing time, and walking time was shorter in the experimental group, but the difference from the control group was statistically significant only for head up time and walking time (p < 0.05). GV-26 acupuncture with dexamethasone is useful for awareness effects after anesthesia.
Objectives : Electroacupuncture (EA)-induced analgesia has been known to be mediated through the activation of opioid, noradrenergic and serotonergic receptors. However, little study on serotonergic mechanism has been performed in an animal model of chronic pain. The present study was designed to elucidate the type of serotonergic receptors responsible for EA analgesia in the chronic pain model. Methods : In rats with complete Freund's: adjuvant-induced inflammation and spinal nerve injury, spinal wide dynamic range (WDR) cell responses to graded electrical stimulation of afferent C fiber were recorded before and after spinal application of selective 5-hydroxytryptamine (5-HT) receptor antagonists. EA stimulation (2Hz, 0.5msec, 3mA) was applied to the contralateral Zusanli point for 30 min. Results : In both models of chronic pain, WDR cell responses were greatly inhibited after EA stimulation. EA-induced inhibition of WDR celt responses was significantly attenuated by spinal application of non-selective 5-HT receptor antagonist, dihydroergocristine Of 5-HT receptor antagonists tested, 5-HT1A (WAY 100635) and 5-HT2 (LY53857) receptor antagonists strongly reduced an ability of EA stimulation to inhibit WDR cell responses. However, 5-HT1B (GR55562) and 5-HT3 (LY278584) receptor antagonists also had weak but significant blocking action on EA-induced inhibitory effect on chronic pain. Conclusions : Dorsal hem cell responses, afferent C fiber stimulation, chronic pain, electroacupuncture, serotonergic receptors.
Objectives : DaeBangPungTang(DBPT) is one of the prescriptions used for the treatment of knee arthritis in oriental medicine. The present study aimed to examine the analgesic effect of DBPT on a rat model of carrageenan-induced arthritis, and the relations between DBPT-induced analgesia and endogenous nitric oxide(NO) and inducible NO synthase (iNOS), cyclooxygenase-2 (COX-2), and c-Fos protein expression in the spinal cord. Methods : Carrageenan-induced arthritis rat model was used to test the effect of DBPT as a chronic pain model. After the induction of arthritis, rats subsequently showed a reduced stepping force of the affected limb for at least tile next 4 days. The reduced stepping force of the limb was presumably due to a painful knee, since oral infection of indomethacin produced temporary improvement of weight bearing. DBPT dissolved in normal saline was minted several acupoints. After the treatment, behavioral tests measuring stepping force were periodically conducted during the next 12 hours. Results : DBPT produced significant improvement of stepping force of the hindlimb affected by the arthritis lasting at least 9 hours. The magnitude of this improvement was equivalent to that obtained after an oral injection of 3mg/kg of indomethacin and this improvement of stepping force was interpreted as an analgesic effect. DBPT produced the improvement of stepping force of the affected hindlimb in a dose-dependent manner. Both NO production and iNOS, COX-2 protein expression increased by arthritis were suppressed by DBPT. DBPT on combination with electroacupuncture (EA) produced more powerful and longer lasting improvement of stepping force of the hindlimb affected by the arthritis than either DBPT or EA did. Conclusion : The present study suggest that DBPT produces a potent analgesic effect on the chronic hee arthritis pain model in the rat and that DBPT-induced analgesia modulate endogenous NO through the suppression of iNOS/COX-2 protein expression.
Obiecnves : The purpose of this study was to examine the analgesic effect of moxi-tar on a rat model of carrageenan-induced arthritis and the relations between moxi-tar-induced analgesia and endogenous NO and iNOS, cyclooxygenase-2 (COX-2), and c-Fos protein expression in the spinal cord. Methods : Carrageenan-induced arthritis rat model was used to test the effect of moxi-tar as a chronic pain model. After the induction of arthritis, rats subsequently showed a reduced stepping force of the affected limb for at least the next 4 days. The reduced stepping force of the limb was presumably due to a painful knee, since oral injection of indomethacin produced temporary improvement of weight bearing. Moxi-tar dissolved in ethyl alcohol was injected several acupoints. After the treatment, behavioral tests measuring stepping force were periodically conducted during the next 12 hours. Results : Moxi-tar produced significant improvement of stepping force of the hindlimb affected by the arthritis lasting at least 9 hours. The magnitude of this improvement was equivalent to that obtained after an oral injection of 3 mg/kg of indomethacin and this improvement of stepping force was interpreted as an analgesic effect. Moxi-tar produced the improvement of stepping force of the affected hindlimb in a dose-dependent manner. Both NO production and iNOS, COX-2 protein expression increased by arthritis were suppressed by moxi-tar. moxi-tar on combination with electroacupuncture (EA) produced more powerful and longer lasting improvement of stepping force of the hindlimb affected by the arthritis than either moxi-tar or EA did. Conclusion : The present study suggest that moxi-tar produces a potent analgesic effect on the chronic knee arthritis pain model in the rat and that moxi-tar-induced analgesia modulate endogenous NO through the suppression of iNOS/COX-2 protein expression.
Objectives : Electroacupuncture(EA) has been used effectively in producing analgesia on ankle sprain pain of humans and animals. Currently to examine the underlying mechanisms of the EA-induced analgesia, the effects of EA on weight-bearing forces(WBR) were examined at ankle sprain classified as grade 3 in rats. Methods : The severe ankle sprain classified as grade 3 was induced surgically by ankle ligament injury in the Sprague-Dawley rats. WBR of the affected foot were examined to evaluate effects and mechanism of EA(2 Hz, 1 ms pulse width, 2 mA intensity, for 15 min) which was applied to either SI6, GB34, or GB39 acupoints. The rats were pretreated with naltrexone(10 mg/kg, i.p.) as an opioid receptor antagonist or phentolamine(5 mg/kg, i.p) as an ${\alpha}$-adrenoceptor antagonist at 30 min before EA. Results : The daily repeat EA at either SI6, GB34, or GB39 showed significant analgesic effects on the severe ankle sprain. Particularly, daily EA at GB34 showed more potent analgesic effect than the others. In addition, the naltrexone pretreatment completely blocked the analgesic effect of EA at GB34, indicating the involvement of the endogenous opioid system in mediating the effect of EA at GB34. However, the phentolamine pretreament blocked analgesic effects of EA at either SI6 or GB39, indicating the involvement of ${\alpha}$-adrenoceptors in mediating the effect of EA at either SI6 or GB39. Conclusions : These data suggest that EA-induced analgesia on ankle sprain pain is mediated through either endogenous opioids or ${\alpha}$-adrenoceptors dependant on acupoint specific pattern.
Although there are many reports on the bovine electroacupuncture anesthesia, its application to clinical cases needs much to be verified. In order to apply the electroacupuncture anesthesia to bovine species, a new anesthesia technique, which is safe and effective, must be developed. In the present study, 11 meridian points were selected and 11 kinds of meridian points were prescribed to develop an effective and safe electroacupucture methods in the bovine species. The results obtained are summarized as fellows : 1. When the maximun electric current (30Hz at 5.3-5.6V ) was applied, anesthesia was attained with the signs of tetany and tremor : When the electric current was continued for 15-20 minutes, the signs of tetany and tremor diminished markedly. 2. If the electric current was adjusted to 30Hz at 3.5-4.0V and continued, the tetany and tremor disappeared. The skin was slackened, thus suitable for surgical operation. The continuation of anesthesia could be regulated at operator's own will. 3. The same anesthesia effect could be attained by using any one meridian point when the points were symmetrical. 4. Transient changes of clinical signs and blood pictures were noted during the stages of acupuncture anesthesia. However, the red blood cell counts, white blood cell counts and hematocrit values were always within the normal range.
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