High membrane permeability for melatonin

Haijie Yu, Eamonn J Dickson, Seung Ryoung Jung, Duk Su Koh, Bertil Hille

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

The pineal gland, an endocrine organ in the brain, synthesizes and secretes the circulating night hormone melatonin throughout the night. The literature states that this hormone is secreted by simple diffusion across the pinealocyte plasma membrane, but a direct quantitative measurement of membrane permeability has not been made. Experiments were designed to compare the cell membrane permeability to three indoleamines: melatonin and its precursors N-acetylserotonin (NAS) and serotonin (5-HT). The three experimental approaches were (1) to measure the concentration of effluxing indoleamines amperometrically in the bath while cells were being dialyzed internally by a patch pipette, (2) to measure the rise of intracellular indoleamine fluorescence as the compound was perfused in the bath, and (3) to measure the rate of quenching of intracellular fura-2 dye fluorescence as indoleamines were perfused in the bath. These measures showed that permeabilities of melatonin and NAS are high (both are uncharged molecules), whereas that for 5-HT (mostly charged) is much lower. Comparisons were made with predictions of solubility-diffusion theory and compounds of known permeability, and a diffusion model was made to simulate all of the measurements. In short, extracellular melatonin equilibrates with the cytoplasm in 3.5 s, has a membrane permeability of ~1.7 μm/s, and could not be retained in secretory vesicles. Thus, it and NAS will be "secreted" from pineal cells by membrane diffusion. Circumstances are suggested when 5-HT and possibly catecholamines may also appear in the extracellular space passively by membrane diffusion.

Original languageEnglish (US)
Pages (from-to)63-76
Number of pages14
JournalJournal of General Physiology
Volume147
Issue number1
DOIs
StatePublished - 2016
Externally publishedYes

Fingerprint

Melatonin
Permeability
Serotonin
Baths
Membranes
Fluorescence
Cell Membrane
Hormones
Cell Membrane Permeability
Pineal Gland
Fura-2
Secretory Vesicles
Extracellular Space
Solubility
Catecholamines
Cytoplasm
Coloring Agents
Brain
N-acetylserotonin

ASJC Scopus subject areas

  • Physiology

Cite this

High membrane permeability for melatonin. / Yu, Haijie; Dickson, Eamonn J; Jung, Seung Ryoung; Koh, Duk Su; Hille, Bertil.

In: Journal of General Physiology, Vol. 147, No. 1, 2016, p. 63-76.

Research output: Contribution to journalArticle

Yu, Haijie ; Dickson, Eamonn J ; Jung, Seung Ryoung ; Koh, Duk Su ; Hille, Bertil. / High membrane permeability for melatonin. In: Journal of General Physiology. 2016 ; Vol. 147, No. 1. pp. 63-76.
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