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- W8840807 abstract "In the present study we examined the kinetics of binding of iodinated COOH-terminal octapeptide of cholecystokinin (125I-CCK-8) to its receptors on dispersed acini prepared from guinea pig pancreas. At 37 degrees C, binding of 125I-CCK-8 reached a steady state after 60 min of incubation. Dissociation of bound 125I-CCK-8 was biphasic, indicating that the labeled peptide binds in two distinct states: a rapidly dissociating state and a slowly dissociating state. Binding of 125I-CCK-8 in the rapidly dissociating state was maximal within 3 min of incubation, did not depend on incubation temperature or cellular energy metabolism, could be stripped by 0.5 M potassium thiocyanate, and showed accelerated dissociation with CCK-8 or dibutyrylguanosine 3',5'-cyclic monophosphate (Bt2cGMP). Binding of 125I-CCK-8 in the slowly dissociating state was maximal after 60 min of incubation, was decreased by reducing the incubation temperature or inhibiting cellular energy metabolism, was not stripped by 0.5 M potassium thiocyanate, and did not show accelerated dissociation with CCK-8 or Bt2cGMP. Increasing the concentration of 125I-CCK-8 increased the fraction of radioactivity bound in the rapidly dissociating state. When binding of 125I-CCK-8 reached a steady state, nearly all of the bound radioactivity was in the slowly dissociating state. Computer analysis of the inhibition of 125I-CCK-8 by CCK-8 under experimental conditions where the rapidly dissociating state predominates demonstrated a complete loss of high-affinity binding sites.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W8840807 date "1988-07-01" @default.
- W8840807 modified "2023-10-13" @default.
- W8840807 title "Kinetics of binding of cholecystokinin to pancreatic acini" @default.
- W8840807 doi "https://doi.org/10.1152/ajpgi.1988.255.1.g106" @default.
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