Preventive effect of Guizhi decoction on myocardial injury after chemical sympathectomy / 中国病理生理杂志

[ ABSTRACT] AIM:To investigate the preventive effect of Guizhi decoction on myocardial injury after chemical sympathectomy induced by 6-hydroxydopamine (6-OHDA).METHODS:Wistar rats (n=54) were randomly divided in-to 6 groups.Methycobal and Guizhi decoction ( with different proportions between Ramulus Cinnamomi and Radix paeoniae Alba at 2∶1, 1∶2 or 1∶1) were pre-administered to the rats.Immunohistochemical method was used to observe the cardiac sympathetic nerve distribution.The contents of tyrosine hydroxylase (TH), choline acetylaminotransferase (ChAT) and growth-associated protein 43 (GAP-43) in the left ventricle were measured by ELISA.The serum levels of myocardial en-zymes and morphology of myocardial tissues were also observed.RESULTS:6-OHDA successfully induced cardiac sympa-thetic denervation as the contents of TH and GAP-43 in the left ventricle declined significantly.Compared with model group, the content of TH was elevated in both methycobal group and Guizhi decoction groups, while the content of GAP-43 was elevated only in Guizhi decoction groups.The serum levels of myocardial enzymes and the histopathological changes of the cardiac tissues were deteriorated after injection of 6-OHDA, indicating that the myocardial injury was established. Methycobal and Guizhi decoction normalized the abnormal change.Guizhi decoctions at 2∶1 and 1∶1 showed the best effi-cacy.CONCLUSION:6-OHDA-induced sympathetic denervation causes myocardial injury.Guizhi decoction with the proportions between Ranulus Cinnamomi and Radix paeoniae Alba at 2∶1 and 1∶1 effectively alleviate the myocardial injury after cardiac sympathetic denervation induced by 6-OHDA.

The Effect of Chemical Sympathectomy on Moxibustion-Induced Immunomodulation in the Rat Spleen

BACKGROUND: To investigate the role of sympathetic nervous system (SNS) in moxibustion-induced immunomodulation, the effects of chemical sympathectomy on moxibustion-induced changes in splenic NK cell cytotoxicity, T and B cell proliferation were studied in Sprague-Dawley male rats. METHODS: Chemical sympathectomy was achieved with intraperitoneal injection of 6-hydroxydopamine 50 mg/kg/day for 3 successive days. Direct moxibustion (6-minute interval, 9 moxa ball, each of which weighing 0.007 g and burning for 40 seconds) was applied on unilateral anterior tibial muscle region where Zusanli (ST36) acupoint is located, once a day for 7 successive days. NK cell cytotoxicity was measured by 4hr-51Cr release assay. Mitogen-induced lymphocyte proliferation was analyzed by [3H]-thymidine incorporation assay. RESULTS: NK cell cytotoxicity was suppressed by moxibustion, more in sympathectomized rats than in vehicle-treated rats. T cell proliferation induced by concanavalin A was not affected by moxibustion. B cell proliferation induced by lipopolysaccharide showed no significant change in vehicle- treated rats, but an increase in sympathectomized rats by moxibustion. Sympathectomy alone induced augmentation of NK cell cytotoxicity and suppression of T cell proliferation. CONCLUSION: These results suggest that SNS has no direct relation with moxibution-induced immunomodulation but has an important role in the mechanism to keep the homeostasis of immune system by tonically inhibiting excessive changes of various immune components.

The Effects of Sympathectomy by 6-Hydroxydopamine and Pretreatment of Testosterone on the Contractility of the Vas Deferens in Rats / 대한비뇨기과학회지

PURPOSE: The chemical sympathectomy is now widely performed procedure for vascular diseases of extremities. But it has been reported that this procedure may produce ejaculatory failure in men. We investigated the changes of the contractility of the vas deferens after chemical sympathectomy by 6-hydroxydopamine, and whether these changes can be recovered by the pretreatment of testosterone. MATERIALS AND METHODS: The rats were divided into 5 groups, which were 1) control 2) 6-hydroxydopamine 100mg group 3) 6-hydroxydopamine 100mg + testosterone100mg group 4) 6-hydroxydopamine 200mg group 5) 6-hydroxydopamine 200mg + testosterone 100mg group. 6-hydroxydopamine was injected intraperitoneally in each group at day 1, 3, 5 and killed at day 6. Testosterone was Injected intraperitoneally 30 minutes prior to 6-hydroxydopamine injection at day 1 . The vas deferns was quickly dissected out and the contractilities by electrical field stimulation, phenylephrine, acetylcholine and KCI were compared with control group. RESULTS: In prostatic vas, the phasic contractions were reduced only in 6-hydroxy- dopamine 200mg group and recovered incompletely by testosterone. Tonic contractions in prostatic vats were reduced in 6-hydroxydopamine looms group and 6-hydroxydopamine 100mg+testosterone 100mg group at 4, 8, 16Hz field stimulation and there was no significant difference between the two groups. The contractilies in 6-hydroxydopamine 200mg group and 6-hydroxydopamine 200mg+testosterone 100mg group were reduced at all frequencies, and testosterone pretreatment group showed slightly recovered contractility at 32, 64Hz, but less than those of control. In epididymal vas, the phasic and tonic contractions were reduced in all groups compared to control except in 6-hydroxydopamine 100mg+testosterone looms group at 32, 64Hz. The effects of 6-hydroxydopamine on phenylephrine or acetylcholine induced contraction showed supersensitivity, however, testosterone pretreatments had no effects on their supersensitivity. In the response to KCI, there was no difference in all the experimental groups. CONCLUSIONS: It seems that chemical sympathectomy results in decreased contraction of the vas deferens, which is the main cause of ejaculatory failure. Although there is some protective effect by testosterone pretreatment, but it is thought that it is not so sufficient to prevent ejaculatory failure. But we suggest that there are possibilities of protective effect of testosterone by altering the dose and time of administration.

Effects of Chemical Sympathectomy in the Causalgiform Pain Produced by Unilateral Partial Ligation of Sciatic Nerve in Rats / 대한마취과학회지

We produced the cauaalgiform pain by unilateral 1/3-1/2 ligation of sciatic nerve in rats.. Withdrawal thresholds to non-noxious stimulation were reduced(mechanical allodynia), and withdrawal thresholds to heat stimulation were reduced(heat hyperalgesia) too. After that, we injected 50 mg/kg guanethidine intraperitoneally for the study of the effects of chemical sympathectomy in postopertive 7th day, 37th day respectively. The results were as follows 1) Mechanical allodynia was alleviated partially in 12 hours, first day after sympathectomy. 2) Heat hypera1gesia was alleviated completely in first day to 4th day after sympathectomy, and reappeared after 5th day.