Identification of ocular cicatricial pemphigoid antibody binding site(s) in human beta4 integrin.

Abstract:

PURPOSE:To identify specific site(s) on human ss4 molecule to which sera from ocular cicatricial pemphigoid (OCP) patients bind and to determine its role in the process of blister formation. METHODS:Clone the fragments representing the extracellular and intracellular domain of ss4 molecule from normal human conjunctival mRNA into an expression vector; map the region to which sera from OCP patients bind by Western blot analysis. Determine the role of the immunodominant region in pathogenesis by demonstrating the ability of the rabbit antibody to the immunodominant region to produce separation of basement membrane zone (BMZ) from the basal epithelial layer when incubated with normal human conjunctiva in an in vitro organ culture model. RESULTS:Majority of the OCP sera tested bound to the C-terminal end of the intracellular domain (IC3.0) of the human ss4 integrin. Further subcloning of IC3.0 demonstrated that a smaller fragment extending from 1489 aa to 1572 aa (IC3.4) was responsible for this binding. This region may have multiple antibody binding sites. Antibody to human IC3.0 and IC3.4 produced in rabbit, resulted in BMZ separation, histologically identical with that observed when normal human conjunctiva was cultured with OCP sera in an human conjunctival organ culture model. CONCLUSIONS:These observations identify IC3.4 as the antibody binding site for sera of OCP patients and suggest a possible role for it in blister formation. Indirectly it highlights certain important aspects of the structural and functional dynamics of the biology of the hemidesmosomes and basement membranes.

authors

Kumari S,Bhol KC,Simmons RK,Razzaque MS,Letko E,Foster CS,Razzaque Ahmed A

keywords:

subject

Has Abstract

pub_date

2001-02-01 00:00:00

pages

379-85

issue

2

eissn

0146-0404

issn

1552-5783

journal_volume

42

pub_type

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