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Co-stimulation blockade targeting CD154 and CD28/B7 modulates the induced antibody response after a pig-to-baboon cardiac xenograft.

Abstract：

BACKGROUND:The induced antibodies against Galalpha1,3Gal (Gal) and non-Gal epitopes may contribute to delayed xenograft rejection (DXR). We asked whether blockade of the CD40/CD154 and CD28/B7 co-stimulatory pathways modulates the baboon elicited antibody response to pig Gal and non-Gal antigens. METHODS:Eighteen baboons received heterotopic heart transplants from pigs transgenic for human decay-accelerating factor (n = 13) or membrane cofactor protein (n = 5). Ten reference ''conventional therapy'' animals received cyclosporin A, cyclophosphamide and mycophenolate mofetil, with (n = 4) or without (n = 6) anti-CD20. Eight ''co-stimulation blockade'' animals received anti-CD154 mAb (IDEC-131) and anti-thymocyte globulin, with (n = 4) or without (n = 4) anti-CD20; two of these animals also received CTLA4-Fc. Anti-alphaGal IgG and IgM, anti-non-Gal antibodies and graft histology were assessed serially. RESULTS:Excluding two early graft failures, median graft survival with conventional therapy was 15 days (range 6 to 36 days, n = 8). Anti-Gal IgG antibody remained low through day 6 to 10, only one graft failure was accompanied by significant rise in anti-Gal IgG, and the anti-non-Gal response was weak (n = 2) or absent (n = 7). However many recipients succumbed with infection (n = 4) or coagulopathy (n = 2); DXR and ICOS+ T cells were prevalent in long-surviving grafts. With co-stimulation blockade, excluding three early graft failures, median graft survival was 7 days (range 6 to 11 days, n = 5). This regimen was very well tolerated, but increased anti-Gal antibody titer within 14 days was associated with graft failure in four of six animals. Although an anti-non-Gal response was present in three of six animals during IDEC-131 monotherapy (one strong, two weak), it was absent in both cases with additional CTLA4-Fc treatment. CONCLUSIONS:As used here, CD154 blockade alone does not completely prevent induction of Gal and non-Gal anti-pig antibodies. Our preliminary data suggest that other co-stimulation pathways, including CD28/B7 and ICOS, are sufficient to mediate high-titer anti-non-Gal antibody to porcine antigens in baboons, and contribute significantly to the pathogenesis of DXR.

journal_name

Xenotransplantation

journal_title

Xenotransplantation

authors

Wu G,Pfeiffer S,Schröder C,Zhang T,Nguyen BN,Lea W,Kelishadi S,Atkinson JB,Schuurman HJ,White DJ,Azimzadeh AM,Pierson RN 3rd

doi

10.1111/j.1399-3089.2005.00221.x

subject

Has Abstract

pub_date

2005-05-01 00:00:00

pages

197-208

issue

eissn

0908-665X

issn

1399-3089

pii

XEN221

journal_volume

pub_type

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Co-stimulation blockade targeting CD154 and CD28/B7 modulates the induced antibody response after a pig-to-baboon cardiac xenograft.