An in vivo model of hyperacute rejection: Characterization and evaluation of the effect of transgenic human complement inhibitors

Marirosa Mora, Massimo Lazzeri, Giovanni Marsicano, Lubbertus C F Mulder, Laura Carraresi, Alessandro Pieri, Alessio Benanchi, Daniela Grifoni, Sandra Nuti, Paolo Bruzzone, Mario Comporti, Raffaello Cortesini, Mara Rossini

Research output: Contribution to journalArticlepeer-review

Abstract

Hyperacute rejection (HAR) occurring after transplantation within phylogenetically distant species is a severe reaction triggered by preexisting xenoreactive antibodies and complement activation, leading to the destruction of the donor organ. Expression of human complement inhibitors in transgenic pig organs prolongs the survival of xenograft in experimental models. Moreover, the extent of protection from hyperacute rejection is dependent on the level and site of expression of the transgenic molecules and, probably, on the combination of different molecules. In this regard a small animal model to test the efficacy of expression vectors and different human molecules could be very advantageous. A murine model developed in our laboratory was characterized by measurement of several parameters characteristic of HAR in the livers of control and transgenic mice expressing transgenic human DAF (CD55) or MCP (CD46) at the end of 2 h of perfusion with human plasma and after 1 day. The parameters studied were heamatological values of hepatic functions (GOT and GPT), induction of pro-inflammatory molecules and histopathological evaluation. Cytokines (IL-1α, IL-1β, IL-6) induction and exposure of P-selectin on the endothelial cell surface, was only observed in control animals after 2 h of perfusion, as an early event. GOT and GPT values increase drammatically after 2 h perfusion and 1 day after the treatment according to the histopathological observation of liver damage. On the contrary, the livers of hDAF or hMCP transgenic mice, under the same treatment were significantly protected although the extent of this protection is dependent on the level of expression of transgenic human molecules.

Original languageEnglish
Pages (from-to)205-213
Number of pages9
JournalTransgenic Research
Volume9
Issue number3
DOIs
Publication statusPublished - 2000

Keywords

  • hDAF
  • hMCP
  • Human complement inhibitors
  • Hyperacute rejection
  • IL-1α IL-1β
  • IL-6
  • P-selection
  • Transgenic mice
  • Xenotransplantation

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Biotechnology
  • Food Science

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