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Effects of cryopreservation on the immunogenicity of porcine arterial allografts in early stages of transplant vasculopathy.

Abstract：

BACKGROUND:The number of revascularization procedures including coronary and lower extremity bypass, have increased greatly in the last decade. It suggests a growing need for vascular grafts. Cryopreserved allografts could represent a viable alternative but their immunologic reactivity remains controversial. METHODS:71 pigs (40 recipients and 31 donors) were used. Two femoral grafts per recipient animal were implanted for 3, 7, and 30 days. Types of grafts: fresh autograft as a control graft (n=19), fresh allograft (n=31) and cryopreserved allograft (n=30). Histological and immunohistochemical studies were performed. RESULTS:Fresh allografts compared to autografts showed intimal inflammatory infiltration at 3 days (328 vs. 0 macrophages/mm2; P<0.05) and 7 days (962 vs. 139 T lymphocytes/mm2; P<0.05) post-transplantation. At 30 days, there was a loss of endothelial cells, presence of luminal thrombus and aneurismal lesions (total area=15.8 vs. 8.4 mm2; P<0.05). Cryopreservation did not reduce these lesions nor modify endothelial nitric oxide synthase (eNOS) expression nor modify the number of animals that developed anti-SLA antibodies. Moreover, at 7 days, cryopreserved allografts compared to fresh allografts showed a higher expression of P-selectin (5 out of 5 vs. 1 out of 5; P<0.05) and, at 30 days, a greater inflammatory reactivity (2692 vs. 1107 T lymphocytes/mm2 in media; P<0.05) with a trend towards a higher presence of multinucleated giant cells than in the fresh ones. CONCLUSIONS:The cryopreservation method used maintained immunogenicity of allografts and increased the inflammatory reactivity found in fresh allografts up to 30 days of vascular transplantation.

journal_name

Cryobiology

journal_title

Cryobiology

authors

Solanes N,Rigol M,Khabiri E,Castellà M,Ramírez J,Roqué M,Agustí E,Roig E,Pérez-Villa F,Segalés J,Pomar JL,Engel P,Massaguer A,Martorell J,Rodríguez JA,Sanz G,Heras M

doi

10.1016/j.cryobiol.2005.06.006

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

130-41

issue

eissn

0011-2240

issn

1090-2392

pii

S0011-2240(05)00095-7

journal_volume

pub_type

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Effects of cryopreservation on the immunogenicity of porcine arterial allografts in early stages of transplant vasculopathy.