Abstract:
BACKGROUND:Human CD58 is an adhesion molecule that interacts with CD2 on lymphocytes. We describe here an antibody that blocks responses of human peripheral blood mononuclear cells (PBMCs) to porcine cells and reacts with a porcine protein with homology to CD58. METHODS:Antibodies were isolated with a screen for inhibition of the human antiporcine response. One of these antibodies was used for immunoaffinity purification of a protein that was identified by molecular weight determination, endoglycosidase sensitivity, and microsequencing analysis as a porcine homologue of CD58. RESULTS:The antigen recognized by this antibody was a cell surface protein of relative molecular mass (Mr)=45,000 containing N-linked carbohydrate chains. Immunoaffinity purification of this protein and microsequencing revealed homology to sheep CD58 as well as sequences that were common to this protein and both sheep and human CD58. The protein was widely distributed on porcine cells, including lymphocytes, endothelial cells, muscle cells, and neuronal cells. This antibody efficiently inhibited lysis of porcine targets by human PBMCs in addition to preventing proliferation of the human PBMCs in response to the porcine cells. CONCLUSIONS:The CD2 interaction with porcine cells is important for the efficient recognition of porcine tissue, and inhibition of the human antiporcine immune response with the antibody is likely to be caused by the disruption of the human CD2 interaction with this porcine homologue of CD58. The antibody may prove to be useful for the blocking of this interaction without interfering with other functions of T cells.
journal_name
Transplantationjournal_title
Transplantationauthors
Crosby K,Yatko C,Dersimonian H,Pan L,Edge ASdoi
10.1097/01.tp.0000120377.57543.d8subject
Has Abstractpub_date
2004-04-27 00:00:00pages
1288-94issue
8eissn
0041-1337issn
1534-6080pii
00007890-200404270-00028journal_volume
77pub_type
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