[Effect of total hormone concentration on the determination of amount of binding in the hormone/receptor interaction between erythrocytes and insulin].
The interaction of erythrocytes and [125I]insulin/insulin were studied up to a total insulin concentration of 409 mumol/l. Assuming a single class receptor model the evaluation of receptor affinity Ka and concentration R0 may be performed either by non-linear regression analyses with iteration procedures of R0, Ka and U (nonspecific binding), or by a linear regression analysis of the initial part of the Scatchard plot. Nonlinear fitting of data to a two class receptor model gives results that are reliable only for the high affinity receptor site. The non-definable step of R0 determination leads to uncertainties in results determined by the negative cooperativity model. From the results of this investigation and from considerations of signal modulation by receptor occupancy, some recommendations have been formulated for the evaluation of binding parameters; these should contribute to an improvement in the comparability of studies on the interactions of erythrocytes and insulin.
D004912:Erythrocytes / Q000378:metabolism*; D006801:Humans; D007328:Insulin / Q000031:analogs & derivatives* / Q000097:blood / Q000494:pharmacology*; D007700:Kinetics; D008433:Mathematics; D011972:Receptor, Insulin / Q000187:drug effects / Q000378:metabolism*; D012044:Regression Analysis
D007328:Insulin; C008147:insulin, iodo-; D011972:Receptor, Insulin
Zum Einfluss der totalen Hormonkonzentration auf die Ermittlung von Bindungskenngrössen bei der Hormon/Receptor-Wechselwirkung zwischen Erythrocyten und Insulin.