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Study on the Analgesic Effect and Mechanism of Gutongtie Paste on Model Rats with Formaldehyde-in-duced Pain / 中国药房
China Pharmacy ; (12): 1766-1769, 2017.
Article in Chinese | WPRIM | ID: wpr-512362
ABSTRACT

OBJECTIVE:

To study the analgesic effect and mechanism of Gutongtie paste on model rats with formaldehyde-in-duced pain.

METHODS:

60 SD rats were randomly divided into blank group,model group,Gutongtie paste low-dose,medi-um-dose,high-dose groups(0.594,1.188. 2.376 g/paste,containing crude drug 0.48,0.96,1.92 g)and prednisone acetate group (ig,0.0054 g/kg,external bonding matrix). Model rats with pain was induced by formaldehyde method and immediately adminis-trated after modeling. Electronic tenderness instrument was adopted to determine the pain threshold of rats'ankle joint after adminis-tration of 1,2,3,4,6 h. After 6 h,blood sample 0.3 mL was taken from abdominal aorta then rats were sacrificed. Enzyme linked immunosorbent assay (ELISA) was conducted to determine the β-endorphin (β-EP),prostaglandin E2 (PGE2) contents;spectrophotometry was used to determine nitric oxide(NO)content in rats'serum and inflammatory tissue;and radioimmunoassay was adopted to detect the substance P content in rats'serum,inflammatory tissue and brain tissue.

RESULTS:

Compared with be-fore modeling,pain thresholds in model group at each period were significantly decreased (P<0.05 or P<0.01). Compared with blank group,PGE2,NO of rats,substance P content in inflammatory tissue and brain tissue in model group were significantly in-creased (P<0.05 or P<0.01). Compared with model group,pain thresholds in Gutongtie paste groups at corresponding time points were increased,PGE2 and substance P contents in inflammatory tissue and brain tissue were decreased (P<0.05 or P<0.01);β-EP and NO contents in serum in Gutongtie paste medium-dose,high-dose groups(P<0.05 or P<0.01),NO contents in serum in Gutongtie paste high-dose group were decreased(P<0.05).

CONCLUSIONS:

Gutongtie paste has a certain analgesic and anti-inflammatory effect,and the mechanism may be related to reducing PGE2, NO, substance P contents, increasing β-EP content.

Full text: Available Index: WPRIM (Western Pacific) Language: Chinese Journal: China Pharmacy Year: 2017 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Language: Chinese Journal: China Pharmacy Year: 2017 Type: Article