Effects of exogenous adrenomedullin on expressions of IL-4 and IFN-γ in the early period of mechanical renal trauma of the rats / 中华创伤杂志

ABSTRACT

Objective To observe the effects of exogenous adrenomedullin(ADM)on expressions of IL-4 and IFN-γ following mechanical renal trauma in the rats. Methods A total of 104 healthy adult plain grade Wistar rats were,randomly divided into four groups,ie,normal control group(eight rats),simple trauma group(32 rats),prevention group(32 rats,injected with ADM before trauma)and treatment group(32 rats,injected with ADM after trauma).The experimental model of rat with mechanical renal trauma was prepared by striking the ridge of the left rib area with free dropping forrous hammer in all groups except for the control group.Ten minutes before and after mechanical renal trauma,ADM ly.All rats were sacrificed by draining out all the blood in their hearts at 1,6,12 and 24 hours after mechanical renal trauma.Then,the renal tissues were removed and fixed with 10% formalin for observing the positive expressions of IL-4 and IFN-γ by means of SABC staining. Results Compared with the simple trauma group,the positive expression of IL-4 in the prevention group Wag observed at 1 hour,gradually increased at 6 and 12 hours and reached the peak at 24 hours after mechanical renal trauma,with statistical difference(P<0.05).The positive expression of IL-4 in the treatment group WaS increased at one hour and reached the peak at 6 hours after mechanical renal trauma,with statistical difference(P<0.05).Compared with the simple trauma group,the IFN-γ expression in the prevention group was,increased at 6 and 24 hours but decreased at 12 hour,while that in the treatment group was decreased significantly at 1,12 and 24 hours.Compared with the normal control group,the IFN-γ expression in the treatment group was significantly decreased at 1 and 12 hours.The IFN-γ expression in the treatment group was lower than that in the prevention group at every time points,with statistical difference(P<0.05). Conclusions Preventive and therapeutic administration of exogenous ADM can enhance the expression of IL-4.IL-4 and IFN-γ play an antagonistic role in repair ofthe renal injury.The primary role of exogenous ADM is the dynamic regulation of IFN-γ expression.