Volume 27, Issue 3 pp. 726-734
Article
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Transgenic expression of a CD46 (membrane cofactor protein) minigene: Studies of xenotransplantation and measles virus infection

Bruce R. Thorley

Corresponding Author

Bruce R. Thorley

The Austin Research Institute, Heidelberg, Australia

Austin Research Institute, Studley Road, Heidelberg, Victoria 3084, Australia Fax: +61-3-9287-0666Search for more papers by this author
Julie Milland

Julie Milland

The Austin Research Institute, Heidelberg, Australia

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Dale Christiansen

Dale Christiansen

The Austin Research Institute, Heidelberg, Australia

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Marc B. Lanteri

Marc B. Lanteri

The Austin Research Institute, Heidelberg, Australia

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Beth McInnes

Beth McInnes

The Austin Research Institute, Heidelberg, Australia

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Ingrid Moeller

Ingrid Moeller

University of Melbourne Department of Medicine, Austin and Repatriation Medical Centre, Heidelberg, Australia

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Pierre Rivailler

Pierre Rivailler

Laboratoire d'Immunobiologie Moléculaire, Ecole Supérieure de Lyon, UMR 49, CNRS, Lyon, France

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Branka Horvat

Branka Horvat

Laboratoire d'Immunobiologie Moléculaire, Ecole Supérieure de Lyon, UMR 49, CNRS, Lyon, France

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Chantal Rabourdin-Combe

Chantal Rabourdin-Combe

Laboratoire d'Immunobiologie Moléculaire, Ecole Supérieure de Lyon, UMR 49, CNRS, Lyon, France

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Denis Gerlier

Denis Gerlier

Immunité et Infections Virales, IVMC, CNRS-UCBL, UMR 5537, Faculté de Médecine Lyon-RTH Laënnec, Lyon, France

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Ian F. C. McKenzie

Ian F. C. McKenzie

The Austin Research Institute, Heidelberg, Australia

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Bruc. E. E. Loveland

Bruc. E. E. Loveland

The Austin Research Institute, Heidelberg, Australia

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First published: 05 December 2005
Citations: 52

Abstract

CD46 (membrane cofactor protein) is a human cell-surface regulator of activated complement and a receptor for the measles virus. A CD46 transgenic mouse line with an expression pattern similar to that of human tissues has been produced, to develop an animal model of (i) the control of complement activation by complement regulators in hyperacute rejection of xenografts, and (ii) measles virus infection. The mouse line was made using a CD46 minigene that includes promoter sequence and the first two introns of genomic CD46, which was coinjected into mouse ova with chicken lysozyme matrix attachment region DNA. A high level of CD46 expression in homozygotic transgenic mice was obtained with spleen cells having approximately 75% of the level found on human peripheral blood mononuclear cells. CD46 was detected in all tissues examined by immunohistochemistry, radioimmunoassay and Western blotting, showing that these mice were suitable for transplantation and measles virus infection studies. It also indicated that the transgene included the important regulatory elements of the CD46 promoter. Transgenic spleen cells were significantly protected in vitro from human complement activated by either the classical or alternative pathways and from alternative pathway rat complement. Furthermore, transgenic mouse hearts transplanted to rats regulated complement deposition in an in vivo model of antibody-dependent hyperacute xenograft rejection. Similar to human lymphocytes, transgenic lymphoblasts could be infected in vitro with measles virus; infected cells expressed viral proteins and produced infectious viral particles. The data demonstrate the suitability of this minigene for obtaining high-level CD46 expression sufficient for enhanced resistance of transgenic cells to complement attack and for obtaining wide tissue distribution of CD46, analogous to human tissues and, therefore, useful for comparative studies.

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