Effective antiplatelet therapy does not prolong transgenic pig to baboon cardiac xenograft survival.

Abstract:

BACKGROUND:Microvascular thrombosis is a prominent characteristic of delayed xenograft rejection, therefore the effects of antiplatelet therapy with aspirin and clopidogrel on long-term cardiac xenograft function was investigated in a heterotopic pig-to-baboon cardiac transplant model. METHODS:Donor hearts from human CD46 transgenic pigs were transplanted heterotopically to baboons. The recipients received immunosuppression that included tacrolimus, sirolimus, corticosteroids, anti-CD20 monoclonal antibody and TPC, an alpha-galactosyl-polyethylene glycol conjugate. In group 1 (n = 9) in addition to immunosuppression, the recipients received combination therapy consisting of aspirin (80 mg/day) and clopidogrel (75 mg/day) beginning 2 days after transplant and continuing until cessation of graft function. Antiaggregatory efficacy was evaluated by platelet aggregation assay. In group 2 (n = 9) antiplatelet drugs were not given. RESULTS:Functional assays confirmed inhibition of platelet aggregation in group 1 suggesting sufficient systemic effects of the treatment. However, anticoagulant therapy did not result in significant prolongation of xenograft function (group 1: median survival 22 days, range 15 to 30 days; group 2: median survival 15 days, range 4 to 53 days). Histologic analysis at rejection revealed no difference in the level of platelet containing thrombi between the groups. CONCLUSIONS:Inhibition of platelet aggregation by a combination of aspirin and clopidogrel did not have a significant impact on the length of xenograft survival or on the development of microvascular thrombosis in this pig-to-primate model.

journal_name

Xenotransplantation

journal_title

Xenotransplantation

authors

Schirmer JM,Fass DN,Byrne GW,Tazelaar HD,Logan JS,McGregor CG

doi

10.1111/j.1399-3089.2004.00159.x

subject

Has Abstract

pub_date

2004-09-01 00:00:00

pages

436-43

issue

5

eissn

0908-665X

issn

1399-3089

pii

XEN159

journal_volume

11

pub_type

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