Extracellular N-domain alone can mediate specific heterophilic adhesion between members of the carcinoembryonic antigen family, CEACAM6 and CEACAM8.

Abstract:

:The domain(s) responsible for the specific heterophilic adhesion between two members of the carcinoembryonic antigen (CEA) family, CEACAM6 and CEACAM8, both of which with three extracellular domains, were investigated using Chinese hamster ovary (CHO) transfectants expressing chimeric antigens. Using a chimeric antigen in which the N-domain, a sole extracellular domain, of CEACAM3 was substituted with that of CEACAM6, it was shown that the N-domain of CEACAM6 alone was able to mediate specific adhesion to CEACAM8. Furthermore, the chimeric antigen was shown to bind significantly to chimeric CEA whose N-domain was substituted with that of CEACAM8, but not to unsubstituted CEA. These results demonstrate that the N-domain alone is sufficient and other domains of CEACAM6 or CEACAM8 are not required for this specific binding. We therefore propose a model of heterophilic interaction between the N-domains, which is distinct from that of CEA-CEA homophilic binding.

authors

Oikawa S,Sugiyama M,Kuroki M,Kuroki M,Nakazato H

doi

10.1006/bbrc.2000.3858

subject

Has Abstract

pub_date

2000-11-30 00:00:00

pages

564-8

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(00)93858-0

journal_volume

278

pub_type

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