Abstract
Given the prominent position of pig endothelial cells in pig-to-human xenotransplantation and the role of classical and nonclassical MHC class I proteins in T and NK cell recognition, the expression of pig MHC (SLA) class I genes in a pig aortic endothelial cell line (AOC cells) was examined. Using a primer corresponding to a highly conserved region of exon 4, RT-PCR analysis of SLA class I expression in AOC cells revealed not only expression of the classical SLA class I (SLA-1, -2, and -3) genes, but also SLA class I transcripts corresponding to SLA nonclassical class I (class Ib) genes SLA-6 and SLA-8. Further analysis of SLA class Ib expression in porcine aortic endothelial cells using SLA class I gene-specific primers confirmed SLA-6 and SLA-8 expression and also demonstrated expression of SLA-7. While SLA-6 has been relatively well characterized, no data regarding bona fide SLA-7 and SLA-8 transcripts have been reported. Therefore, cDNAs containing the complete open reading frames of SLA-6, -7, and -8 were obtained. Compared to an SLA-1 protein sequence, the predicted SLA-7 and -8 protein sequences exhibited most sequence divergence in α1, α2, and cytoplasmic domains. Expression of SLA-6, -7, and -8 was examined by RT-PCR using RNA prepared from a variety of tissues. SLA-6 transcripts were detected in every tissue examined. Except for brain, SLA-8 transcripts were similarly widespread. SLA-7 exhibited more limited tissue distribution.
References
Ando A, Kawata H, Shigenari A, Anzai T, Ota M, Katsuyama Y, Sada M, Goto R, Takeshima SN, Aida Y, Iwanaga T, Fujimura N, Suzuki Y, Gojobori T, Inoko H (2003) Genetic polymorphism of the swine major histocompatibility complex (SLA) class I genes SLA-1, -2 and -3. Immunogenetics 55:583–593
Bjorkman PJ, Saper MA, Samraoui B, Bennett WS, Strominger JL, Wiley DC (1987a) Structure of the human class I histocompatibility antigen, HLA-A2. Nature 329:506–512
Bjorkman PJ, Saper MA, Samraoui B, Bennett WS, Strominger JL, Wiley DC (1987b) The foreign antigen binding-site and T-cell recognition regions of class I histocompatibility antigens. Nature 329:512–518
Carrillo A, Chamorro S, Rodriguez-Gago M, Alvarez B, Molina MJ, Rodriguez-Barbosa JI, Sanchez A, Ramirez P, Munoz A, Dominguez J, Parrilla P, Yelamos J (2002) Isolation and characterization of immortalized porcine aortic endothelial cell lines. Vet Immunol Immunopathol 89:91–98
Chardon P, Rogel-Gaillard C, Cattolico L, Duprat S, Vaiman M, Renard C (2001) Sequence of the swine major histocompatibility complex region containing all nonclassical class I genes. Tissue Antigens 57:55–65
Ehrlich R, Lifshitz R, Pescovitz MD, Rudikoff S, Singer DS (1987) Tissue-specific expression and structure of a divergent member of a class I MHC gene family. J Immunol 139:593–602
Renard C, Chardon P, Viman M (2003) The phylogenetic history of the MHC class I gene families in pig, including a fossil gene predating mammalian radiation. J Mol Evol 57:420–434
Acknowledgements
This work was supported in part by the Office of Research and Development, Department of Veterans Affairs and NIH AI49885 (MDC) and AI054324 (CNG-B). We are grateful to Dr. Jose Yelamos for providing AOC cells and Dr. Christine Renard for sharing unpublished data.
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The nucleotide sequence data reported in this paper have been submitted to the GenBank nucleotide sequence database and have been assigned the accession numbers AY463535–AY463542
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Crew, M.D., Phanavanh, B. & Garcia-Borges, C.N. Sequence and mRNA expression of nonclassical SLA class I genes SLA-7 and SLA-8 . Immunogenetics 56, 111–114 (2004). https://doi.org/10.1007/s00251-004-0676-z
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DOI: https://doi.org/10.1007/s00251-004-0676-z