Science, Vol 203, Issue 4380, 544-547
Copyright © 1979 by American Association for the Advancement of Science
Radioimmunoassay of the insulin receptor: a new probe of receptor structure and function
LC Harrison,
J Flier,
A Itin,
CR Kahn,
and
J Roth
A sensitive and specific radioimmunoassay for the insulin receptor has been developed employing receptor autoantibodies from the serum of a patient with insulin-resistant diabetes. The assay detects insulin binding sites at concentrations as low as 0.1 nanomolar; distinguishes between receptors originating from human placental membranes, human lymphoblastoid cells, and mouse liver membranes; and measures the receptor independently of its binding function. Down-regulation, or loss of binding after exposure to insulin, is associated with loss of immunoreactive receptor.