THE THYROTROPHIN RECEPTOR IN GUINEA-PIG THYROID HOMOGENATE: INTERACTION WITH THE LONG-ACTING THYROID STIMULATOR

in Journal of Endocrinology
Authors:
S. W. MANLEY
Search for other papers by S. W. MANLEY in
Current site
Google Scholar
PubMed
Close
,
J. R. BOURKE
Search for other papers by J. R. BOURKE in
Current site
Google Scholar
PubMed
Close
, and
R. W. HAWKER
Search for other papers by R. W. HAWKER in
Current site
Google Scholar
PubMed
Close
Restricted access
Rent on DeepDyve

Sign up for journal news

SUMMARY

Immunoglobulin G (IgG) prepared from sera containing the long-acting thyroid stimulator (LATS) inhibited the receptor binding of 125I-labelled thyrotrophin (TSH) in a particulate fraction of guinea-pig thyroid homogenate. This inhibition was shown to involve a binding interaction between IgG containing LATS and the receptor with a diminution in the number, but not affinity, of sites available for binding of TSH. Studies of dissociation kinetics and gel filtration of receptor—TSH complexes indicated that IgG containing LATS did not combine with receptors occupied by TSH. The data provide evidence that LATS and TSH bind to the same receptor site.

 

  • Collapse
  • Expand