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Parasar P, Wilhelm A, Rutigliano HM, Thomas AJ, Teng L, Shi B, Davis WC, Suarez CE, New DD, White KL, Davies CJ. Expression of bovine non-classical major histocompatibility complex class I proteins in mouse P815 and human K562 cells. Res Vet Sci 2016; 107:161-170. [PMID: 27473990 DOI: 10.1016/j.rvsc.2016.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 05/20/2016] [Accepted: 06/06/2016] [Indexed: 11/16/2022]
Abstract
Major histocompatibility complex class I (MHC-I) proteins can be expressed as cell surface or secreted proteins. To investigate whether bovine non-classical MHC-I proteins are expressed as cell surface or secreted proteins, and to assess the reactivity pattern of monoclonal antibodies with non-classical MHC-I isoforms, we expressed the MHC proteins in murine P815 and human K562 (MHC-I deficient) cells. Following antibiotic selection, stably transfected cell lines were stained with H1A or W6/32 antibodies to detect expression of the MHC-I proteins by flow cytometry. Two non-classical proteins (BoLA-NC1*00501 and BoLA-NC3*00101) were expressed on the cell surface in both cell lines. Surprisingly, the BoLA-NC4*00201 protein was expressed on the cell membrane of human K562 but not mouse P815 cells. Two non-classical proteins (BoLA-NC1*00401, which lacks a transmembrane domain, and BoLA-NC2*00102) did not exhibit cell surface expression. Nevertheless, Western blot analyses demonstrated expression of the MHC-I heavy chain in all transfected cell lines. Ammonium-sulfate precipitation of proteins from culture supernatants showed that BoLA-NC1*00401 was secreted and that all surface expressed proteins where shed from the cell membrane by the transfected cells. Interestingly, the surface expressed MHC-I proteins were present in culture supernatants at a much higher concentration than BoLA-NC1*00401. This comprehensive study shows that bovine non-classical MHC-I proteins BoLA-NC1*00501, BoLA-NC3*00101, and BoLA-NC4*00201 are expressed as surface isoforms with the latter reaching the cell membrane only in K562 cells. Furthermore, it demonstrated that BoLA-NC1*00401 is a secreted isoform and that significant quantities of membrane associated MHC-I proteins can be shed from the cell membrane.
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Affiliation(s)
- Parveen Parasar
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; Center for Integrated BioSystems, 4700 Old Main Hill, Utah State University, Logan, UT, USA
| | - Amanda Wilhelm
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; Center for Integrated BioSystems, 4700 Old Main Hill, Utah State University, Logan, UT, USA
| | - Heloisa M Rutigliano
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; School of Veterinary Medicine, 4815 Old Main Hill, Utah State University, Logan, UT, USA
| | - Aaron J Thomas
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; Center for Integrated BioSystems, 4700 Old Main Hill, Utah State University, Logan, UT, USA
| | - Lihong Teng
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; Center for Integrated BioSystems, 4700 Old Main Hill, Utah State University, Logan, UT, USA
| | - Bi Shi
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; Center for Integrated BioSystems, 4700 Old Main Hill, Utah State University, Logan, UT, USA
| | - William C Davis
- Department of Veterinary Microbiology and Pathology, P.O. Box 647040, Washington State University, Pullman, WA, USA
| | - Carlos E Suarez
- USDA-ARS Animal Disease Research Unit, P.O. Box 646630, Washington State University, Pullman, WA, USA
| | - Daniel D New
- Department of Veterinary Microbiology and Pathology, P.O. Box 647040, Washington State University, Pullman, WA, USA
| | - Kenneth L White
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; School of Veterinary Medicine, 4815 Old Main Hill, Utah State University, Logan, UT, USA; Center for Integrated BioSystems, 4700 Old Main Hill, Utah State University, Logan, UT, USA
| | - Christopher J Davies
- Department of Animal, Dairy and Veterinary Sciences, 4815 Old Main Hill, Utah State University, Logan, UT, USA; School of Veterinary Medicine, 4815 Old Main Hill, Utah State University, Logan, UT, USA; Center for Integrated BioSystems, 4700 Old Main Hill, Utah State University, Logan, UT, USA.
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