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The azaspirane SKF 105685 (N,N-dimethyl-8, 8-dipropyl-2-azaspiro (4.5) decane-2-propanamine dihydrochloride) has been shown to attenuate or reverse the course of immunologic disease in several animal models, possibly through the induction of nonspecific suppressor activity. To investigate its effects on immune-mediated renal disease, SKF 105685 was administered by gavage to rats with kidney allografts. Six days after transplantation, GFR (inulin clearance, 1.46 +/- 0.27 versus 0.41 +/- 0.15 mL/min per kg; P &lt; 0.005) and RPF (p-aminohippurate clearance, 5.48 +/- 0.98 versus 1.99 +/- 0.72 mL/min per kg; P &lt; 0.01) were significantly higher in SKF 105685-treated rats compared with vehicle-treated control rats. In addition, mononuclear inflammatory cell infiltrates were significantly reduced in SKF 105685-treated animals compared with controls. Treatment also reduced renal production of thromboxane B2 (81 +/- 22 versus 424 +/- 76 pg/min per mg of protein; P &lt; 0.0005), prostaglandin E2 (612 +/- 165 versus 2,059 +/- 351 pg/min per mg of protein; P &lt; 0.005), and 6-keto prostaglandin F1 alpha (217 +/- 56 versus 943 +/- 186 pg/min per mg of protein; P &lt; 0.005), but interleukin-1 beta mRNA levels within kidney allografts were not affected by treatment. Thus, the azaspirane SKF 105685 is a novel immunosuppressive agent that substantially ameliorates renal allograft rejection in the rat. Although the mechanism of action is unknown, the beneficial effects of SKF 105685 in rejection may relate to its ability to induce suppressor activity and/or its effects on eicosanoid production.

The azaspirane SKF 105685 ameliorates renal allograft rejection in rats.