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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

2-[125I]iodomelatonin-binding sites in the human kidney and the effect of guanosine 5'-O-(3-thiotriphosphate).

Putative melatonin receptors in normal kidney cortical tissues of patients with transitional cell carcinoma or renal cell carcinoma were characterized using a melatonin agonist, 2-[125I]iodomelatonin, as the radioligand. 2-[125I]Iodomelatonin-binding sites in the human kidney were stable, saturable, reversible, and of high affinity. The binding affinity was 15.2 +/- 2.5 pmol/L, and the binding density was 1.79 +/- 0.19 fmol/mg protein. The unity of the Hill coefficients and linearity of the Scatchard plots suggested that 2-[125I]iodomelatonin was bound to a single class of binding sites. Pharmacological characterization showed that these binding sites were highly specific to 2-iodomelatonin, melatonin, 6-hydroxymelatonin, and 6-chloromelatonin. Guanosine 5'-O-(3-thiotriphosphate) decreased the binding affinity and density of 2-[125I]iodomelatonin-binding sites in the kidney, suggesting that these binding sites are coupled to a G-protein. The characterization of 2-[125I]iodomelatonin-binding sites in normal kidney tissues taken from patients with transitional cell carcinoma or renal cell carcinoma suggests the existence of 2-[125I]iodomelatonin-binding sites in the human kidney cortex, which is in line with the findings of 2-[125I]iodomelatonin-binding sites in kidneys of other mammals and birds. The implication of a direct melatonin action on renal function in the human is proposed.[1]

References

  1. 2-[125I]iodomelatonin-binding sites in the human kidney and the effect of guanosine 5'-O-(3-thiotriphosphate). Song, Y., Tam, P.C., Poon, A.M., Brown, G.M., Pang, S.F. J. Clin. Endocrinol. Metab. (1995) [Pubmed]
 
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