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.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Oikawa S,Sugiyama M,Kuroki M,Kuroki M,Nakazato Hdoi
10.1006/bbrc.2000.3858subject
Has Abstractpub_date
2000-11-30 00:00:00pages
564-8issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(00)93858-0journal_volume
278pub_type
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