Adhesion molecule expression by the FRTL-5 rat thyroid cell line.
We have examined the expression and function of rat CD54, a homologue of human intercellular adhesion molecule-1 (ICAM-1), by the continuously growing rat thyroid cell line FRTL-5. Approximately 10% of FRTL-5 cells express CD54 under basal conditions and this is not influenced by thyrotrophin. Expression of CD54 is increased by cytokines (gamma-interferon, tumour necrosis factor, interleukin-1) and by an activator of C-kinase, phorbol 12-myristate 13-acetate. Blocking ICAM-1 with a monoclonal antibody directed against this molecule significantly (P less than 0.01) reduced the binding of splenic lymphocytes to FRTL-5 cells but inhibition was consistently greater (P less than 0.01) in the presence of antibodies against a rat homologue of lymphocyte function-associated antigen-1, the receptor on T cells for ICAM-1. In no case was complete blocking of cluster formation observed. These results show that a pure line of rat thyroid cells can express an ICAM-1 homologue and this is directly enhanced by cytokines. Expression of this homologue is partially responsible for lymphocyte adhesion to thyroid cells, which is likely to be a major event in T cell recognition of thyroid antigens in autoimmune thyroiditis.
Tandon
N
N
Department of Medicine, University of Cambridge Clinical School, Addenbrooke's Hospital.
Dinsdale
C
C
Tamatani
T
T
Miyasaka
M
M
Weetman
A P
AP
D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D015703:Antigens, CD / Q000096:biosynthesis*; D001327:Autoimmune Diseases / Q000276:immunology; D015815:Cell Adhesion Molecules / Q000096:biosynthesis*; D002460:Cell Line; D016207:Cytokines / Q000494:pharmacology; D018799:Intercellular Adhesion Molecule-1; D016169:Lymphocyte Function-Associated Antigen-1 / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D051381:Rats; D013268:Stimulation, Chemical; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D013959:Thyroid Diseases / Q000276:immunology; D013961:Thyroid Gland / Q000166:cytology / Q000187:drug effects / Q000276:immunology / Q000378:metabolism*
D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D015815:Cell Adhesion Molecules; D016207:Cytokines; D016169:Lymphocyte Function-Associated Antigen-1; D018799:Intercellular Adhesion Molecule-1; D013755:Tetradecanoylphorbol Acetate