Summary
Peptides may act on the same receptor they regulate or on another receptor by causing regulations via receptor interactions. These receptor regulations include changes of receptor affinity and capacity. Receptor capacity is regulated by internalization, recycling, degradation, synthesis, and modification of bioavailability without migration of the receptor. Examples for those regulations, mostly based on experiments with isolated pancreatic acini from the rat, mouse, or guinea pig, are given.
For the CCK receptor these examples include complex regulations of this receptor by CCK itself, bringing into discussion the hypothesis of negative cooperativity and the two-site receptor model, desensitization of the receptor by CCK, in vivo CCK influences on its receptor, and insulin receptor/CCK receptor interactions. For the insulin receptor the physiological significance of “up and down regulation” of this receptor by insulin itself is discussed. For the IGF receptors and the EGF receptor CCK-induced, Ca2+-mediated regulation of receptor internalization are another type of regulation with unknown physiological and pathophysiological significance. Finally CCK-induced, Ca2+-mediated regulation of somatostatin receptor capacity and affinity are mentioned.
It is postulated that those regulations play an important role in influencing the biological effect of hormones and that knowledge about them may improve our understanding of pathophysiology.
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Abbreviations
- CCK:
-
Cholecystokinin
- IGF:
-
insulin like growth factor
- mRNA:
-
messenger-Ribonukleinsäure
- MW:
-
Molekulargewicht
- VIP:
-
vasoactive intestinal peptide
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Mössner, J., Fischbach, W. Regulation der Azinuszellrezeptoren des Pankreas durch Peptide. Klin Wochenschr 64, 489–498 (1986). https://doi.org/10.1007/BF01713055
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DOI: https://doi.org/10.1007/BF01713055