期刊
JOURNAL OF EXPERIMENTAL MEDICINE
卷 198, 期 7, 页码 999-1010出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20030380
关键词
mimetic; inflammation; endothelia; antibody; phage display
资金
- NHLBI NIH HHS [R01 HL054229, HL 54229] Funding Source: Medline
- NIDCR NIH HHS [P01 DE013499, DE 13499] Funding Source: Medline
- NIDDK NIH HHS [R29 DK050189, R37 DK050189, R01 DK050189, DK 50189] Funding Source: Medline
Neutrophil migration across mucosal epithelium during inflammatory episodes involves the precise orchestration of a number a cell surface molecules and signaling pathways. After successful migration to the apical epithelial surface, apically localized epithelial proteins may serve to retain PMN at the lumenal surface. At present, identification of apical epithelial ligands and their PMN counter-receptors remain elusive. Therefore, to define the existence of apical epithelial cell surface proteins involved in PMN-epithelial interactions, we screened a panel of antibodies directed against epithelial plasma membranes. This strategy identified one antibody (OE-1) that both localized to the apical cell membrane and significantly inhibited PMN transmigration across epithelial monolayers. Microsequence analysis revealed that OE-1 recognized human decay-accelerating factor (DAF, CD55). DAF is a highly glycosylated, 70-80-kD, glycosylphosphatidyinositol-linked protein that functions predominantly as an inhibitor of autologous complement lysis. DAF suppression experiments using antisense oligonucleotides or RNA interference revealed that DAF may function as an antiadhesive molecule promoting the release of PMN from the lumenal surface after transmigration. Similarly, peptides corresponding to the antigen recognition domain of OE-1 resulted in accumulation of PMN on the apical epithelial surface. The elucidation of DAF as an apical epithelial ligand for PMN provides a target for novel anti-inflammatory therapies directed at quelling unwanted inflammatory episodes.
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