Role of Ca2+/calmodulin-dependent protein kinaseⅡin chronic inflamnmtory pain in mice
- VernacularTitle:脊髓钙-钙调素依赖性蛋白激酶Ⅱ在小鼠慢性炎性痛中的作用
- Author:
Fang LUO
;
Yuke TIAN
- Publication Type:Journal Article
- Keywords:
Spinal cord;
ca2+/calmodulin-dependent protein kinase;
Pain
- From:
Chinese Journal of Anesthesiology
2008;28(5):406-408
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the role of ca2+/calmodulin-dependent protein kinase II(CaMKII)in chronic inflammatory pain in mice.Methods Forty healthy male ICR mice weighing 20-25 g were randomly divided into 5 groups(n=8 each):group A control;group B chronic inflammation;group C KN92:group D KN93 30 nmol and group E KN93 45 nmo1.Chronic inflammatory pain was produced by injecting complete Freund's adjuvant(CFA) 20 ul into the dorsal surface of left hind paw in group B,C,D and E.In group A normal saline 20 ul was injected instead of CFA.On the 1st and 3rd day after CFA injection group D,E and Creceived intrathecal administration of specific CaMK Ⅱ inhibitor KN93 30 and 45 nmol and KN92 45 nmol(aninactive analog of KN93).in 5 ul respectively.Mechanical and thermal pain threshold to von Frey hair and radiantheat stimulation were determined at 30 min before CFA injection (To,baseline),30 min before(T1) and 30 min after IT.administration (T2) on the 1st day after CFA injection and at 30 min after IT administration(T3) on the 3rd day after CFA injection.The mice were immediately killed by C02 anesthesia after the last determination of pain threshold.The lumbar segment of the spinal cord Was then removed for determination of the expression of p-CaMK Ⅱ a by Western blotting.Results The thermal and mechanical pain threshold Was significantly decreasedat T1-3 in group B,C and D but only at T1 in group E as compared with the baseline values and group A.Thermal and mechanical pain threshold were significantly hisher at T2.3 in group E than in group B.p-CaMKⅡa expression in the spinal cord was significantly higher in group B,C and D than in group A but there was no significant difference in p-CaMKⅡa between group A and E.The p-CaMKII a expression in the spinal cord was significantyly lower in group E than in group B.Conclusion CaMK Ⅱ is involved in the development of chronic inflammatory pain.
