Abstract
These studies investigated the characteristics and regional distribution of 2-[125I]iodomelatonin binding in Djungarian hamster brain. The results showed that 2-[125I]iodomelatonin labels two types of binding sites, which resemble the ML-1 and ML-2 melatonin subtypes previously described in other tissues. The 2-[125I]iodomelatonin binding site identified in whole brain membranes has a nanomolar affinity (Kd = 1.48 ± 0.26 nM) and biochemical and pharmacological characteristics identical to those of the ML-2 site of Syrian hamster whole brain. The 2-[125I]iodomelatonin site in the hypothalamus has a picomolar affinity (Kd = 43.4 ± 5.1 pM) and resembles the ML-1 site of chicken retina. The localization of 2-[125I]iodomelatonin labeling in autoradiographic studies of the Djungarian hamster brain includes the suprachiasmatic nuclei, the median eminence, the reuniens nucleus, and the paraventricular nucleus of the thalamus.
Original language | English (US) |
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Pages (from-to) | 1011-1018 |
Number of pages | 8 |
Journal | Endocrinology |
Volume | 125 |
Issue number | 2 |
DOIs | |
State | Published - Aug 1989 |
ASJC Scopus subject areas
- Endocrinology