Abstract:
:Blood cells express a cell membrane protein, termed homologous restriction factor 20 (HRF20) and identical to CD59, that can inhibit complement C5b-9 insertion into their membranes. In this report, we investigated by immunohistochemistry whether CD59 was present on cells in human atherosclerotic lesions since membranous C5b-9(m) has been found in lesions. Using a monoclonal anti-CD59 antibody, a cellular CD59 staining pattern was apparent in nearly all lesion specimens. CD59 stain co-localised with macrophage (CD14), T lymphocyte (CD7), endothelial cell (anti-factor VIII related antigen) and smooth muscle cell cytoskeletal-specific antigens (anti-alpha actin and muscle myosin). Endothelial cells always exhibited a more intense stain than the other cell types. CD59 antigen was not localised to any one area of the lesions. Usually CD59-positive cells occurred in clusters rather than as randomly spaced individual cells. CD59 did not stain all cells of the lesion and in particular did not appear to stain all smooth muscle cells. Areas of CD59-negative cells were sometimes observed to exhibit a cellular C5b-9 staining pattern. C5b-9 deposits were also observed in CD59-positive regions. Normal saphenous vein stained strongly for CD59 at the endothelial lining and weakly in the media. Capillaries in atherosclerotic intima always stained strongly for CD59. We conclude that HRF20 is constitutively expressed on endothelium and is under regulatory control in smooth muscle cells. Cellular C5b-9 attack in atherosclerotic lesions is therefore most likely to occur on smooth muscle cells.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Seifert PS,Roth I,Schmiedt W,Oelert H,Okada N,Okada H,Bhakdi Sdoi
10.1016/0021-9150(92)90060-tkeywords:
subject
Has Abstractpub_date
1992-10-01 00:00:00pages
135-45issue
2-3eissn
0021-9150issn
1879-1484pii
0021-9150(92)90060-Tjournal_volume
96pub_type
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