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Malononitrilamides and tacrolimus additively prevent acute rejection in rat cardiac allografts.

Abstract：

:The novel immunosuppressive agents malononitrilamides (MNA) 279 and 715 are derivatives of A77 1726, the primary metabolite of leflunomide. The effects of these agents have been previously demonstrated in rat skin and cardiac allo- and xenotransplant models. The aim of this study was to evaluate the combination of MNA and tacrolimus in a high-responder rat cardiac allotransplant model. Graft survival was evaluated following 10 days of post-transplant oral therapy of MNA or tacrolimus alone and the drugs combined in PVG recipients of DA grafts. An iso-effect curve of single and combined drugs was constructed. Histological changes in grafts were evaluated at 10 days. MNA (20 mg/kg) or tacrolimus (2.4 mg/kg) alone prolonged graft survival with median survival of 14 and 13.5 days, respectively. Combined therapy of MNA (10 mg/kg) and tacrolimus 1.6 mg/kg likewise resulted in a median survival of 13.25 days and an iso-effect curve for these doses was constructed. Another iso-effect curve for median graft survival of 18-19 days, including MNA (10 mg/kg) + tacrolimus (3.2 mg/kg) in combination, MNA (30 mg/kg) alone and tacrolimus (4.8 mg/kg) alone, was constructed and both isoboles showed a straight line, demonstrating additive effects (zero interaction). In addition, histological analysis of grafts confirmed the benefit of the drug combination. No additional toxicity was noted with combined therapy. Optimal doses of MNA or tacrolimus had comparative effects on graft survival and histological changes, and a combination of the two drugs was beneficial with respect to both these parameters. The iso-effect curves verified additive effects of the drug combination.

journal_name

Transpl Immunol

journal_title

Transplant immunology

authors

Qi Z,Simanaitis M,Ekberg H

doi

10.1016/s0966-3274(99)80036-7

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

169-75

issue

3

eissn

0966-3274

issn

1878-5492

pii

S0966-3274(99)80036-7

journal_volume

7

pub_type

杂志文章

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