NDLI: Adrenoceptors in avian and fish pigment cells

Content Provider	Springer Nature Link
Author	Filadelfi, Ana C. Rodrigues, Paula Castrucci, Ana L. Visconti, Maria
Copyright Year	2002
Abstract	Very little is known about the neurohumoral control of avian pigmentation and about adrenergic subtypes mediating catecholaminergic-controlled color change in nonmelanophore pigment cells of poikilothermic vertebrates. To determine the adrenoceptor subtypes in avian melanocytes and fish GEM-81 competitive binding assays were performed with the following radioactive ligands and their cold ligand counterparts: [3H]prazosin and benoxathian or unlabeled prazosin; [3H]rauwolscine and idazoxan or yohimbine; [3H]propranolol and metoprolol or ICI 118,551 and [125I]iodocyanopindolol and ICI 118,551. Our results suggest that: α1-adrenoceptors [K i=1.38 µM; maximum displacement (md)=80%, benoxathian), α2-adrenoceptors (K i=0.21 µM; md=82%, idazoxan), and β2-adrenoceptors (K i=7.3 µM; md=73%, ICI 118,551) are expressed in avian melanocytes, and that α2-adrenoceptors (K i=1.24 nM, idazoxan, K i=59 nM, yohimbine, md=65%, idazoxan and yohimbine; K i=0.19 nM, md=69%, prazosin), β1-adrenoceptors (K i=22.2 µM, md=75%, metoprolol), and β2-adrenoceptors (K i=32.2 µM, md=92%, ICI 118,551) are expressed in GEM-81 erythrophoroma cells. This may be the first study to show the presence of adrenoceptors in avian melanocytes and one of a few characterizing adrenoceptor subtypes in teleost nonmelanophore pigment cells.
Starting Page	599
Ending Page	606
Page Count	8
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	172
Issue Number	7
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-08-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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