OBJECTIVETo investigate the effects of TNF-alpha, TNF-beta and the acceptor expression about mechanical renal trauma with extraneous ADM.

METHODSThere were 104 healthy adult plain grade Wistar rat, randomly divided into four groups:8 in the group of control, 32 in the group of trauma, 32 in the group injected ADM before trauma, 32 in the group injected ADM post trauma. The experimental model of rat kidney with mechanical trauma was prepared by striking the area of rat skin reflecting by kidney with free dropping ferrous hammer in the last three groups. ADM (0.1 nmol/kg) administrated by intraperitoneal injection at 10 minutes before trauma or post trauma respectively in injected groups. All rats were executed by drawing-out all the blood in their hearts. Renal tissue was investigated to study positive expression of TNF-alpha, TNF-beta, TNFR after SABC stained.

RESULTSTNF-alpha expression:the TNF-alpha expression of trauma group was more positive than it of control group in the wound early time. The expression of group injected post trauma was less than it of trauma group at 1 h (P < 0.01). The expression of group injected before trauma was less than it of trauma group at 6 h (P < 0.05) TNF-beta expression: the TNF-beta expression of trauma group was less than it of control group at 1 h and 6 h (P < 0.05). The TNF-beta expression of group injected post trauma was more positive than it of trauma group at the same time of 1 h and 6 h (P < 0.01). TNFR expression: the TNFR expression of trauma group was less than it of control group at 6 h (P < 0.01). The TNFR expression of group injected before trauma was more positive than it of trauma group in the at the same time of 1 h and 6 h (P < 0.01).

CONCLUSIONSThe TNFR can regulate the TNF-alpha and the TNF-beta in dynamic balancing. The regulation of TNFR is main to TNF-alpha. What the TNF-beta participated in renal trauma mainly is the anti-damage process. ADM can reduce the expression of TNF-alpha. ADM increases the expression of TNF-beta and TNFR.