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Characterisation of melatonin binding sites in the eye of the Japanese quail (Coturnix japonica).

Abstract：

:Melatonin binding sites were examined in the quail eye using 2-[125]iodomelatonin. Radioreceptor assays indicated similar binding sites in membrane preparations of neural retina (NR) and choroid-retinal pigment epithelium (C-RPE) eye components. In both tissues binding of the radioligand was specific, saturable, and of high affinity [Kd values NR 50.8 +/- 19.5 pM, C-RPE 98.2 +/- 35.4 pM, mean +/- SEM (n = 4)] and low capacity (Bmax values NR 12.4 +/- 2.7 fmol/mg protein, C-RPE 21.5 +/- 3.2 fmol/mg protein). Kinetic studies demonstrated that association of 2-[125I]iodomelatonin was rapid and further that this binding was reversible upon the addition of 1 microM melatonin. The order of pharmacological potencies of various indoles tested in 2-[125I]iodomelatonin displacement studies was melatonin > 6-chloromelatonin > 6-hydroxymelatonin > N-acetylserotonin > 5-methoxytryptophol > 5-hydroxytryptamine > 5-methoxytryptamine (5-hydroxytryptamine > 5-methoxytryptophol for C-RPE). Studies with guanine nucleotides indicated that the signal transduction mechanism of the binding site may involve a G-protein linkage. This melatonin binding site displays several pharmacological similarities with those investigated in the retina of other species and with those previously characterised in the quail brain.

journal_name

Gen Comp Endocrinol

journal_title

General and comparative endocrinology

authors

James K,Skene DJ,Lucini V,Stankov B,Arendt J

doi

10.1006/gcen.1995.1148

subject

Has Abstract

pub_date

1995-11-01 00:00:00

pages

188-96

issue

2

eissn

0016-6480

issn

1095-6840

pii

S0016-6480(85)71148-3

journal_volume

100

pub_type

杂志文章

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