Profiling Endogenous Opioid Peptide Release from Adrenal Chromaffin Cells
Jenna M Berger1, J Dylan Denison1, A Chathuri De Alwis1
1Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States.
ACS Chemical Neuroscience
|May 6, 2026
Summary
This study introduces a new method to measure opioid peptide and catecholamine release from adrenal cells. It reveals complex release patterns and diverse peptide forms, advancing our understanding of opioid signaling.
Area of Science:
- Neuroscience
- Biochemistry
- Cell Biology
Background:
- The adrenal medulla releases catecholamines and opioid peptides, but their release kinetics and forms are not fully understood.
- Direct measurement of opioid peptide release and characterization of released forms remain understudied.
Purpose of the Study:
- To develop and apply a workflow for real-time measurement of catecholamine (CA) and enkephalin (ENK) release kinetics.
- To profile the diversity of opioid peptide forms released from adrenal chromaffin cells.
- To investigate the temporal complexity of opioid peptide signaling.
Main Methods:
- Fast-scan cyclic voltammetry for real-time electrochemical detection of CA and ENK release.
- Tandem mass spectrometry (LC-MS) for profiling released opioid peptides.
- Single chromaffin cell analysis of exocytotic release from dense-core vesicles.
Main Results:
- Enkephalin release occurred on two distinct time scales: a fast phase concurrent with CA release and a slower phase.
- Proenkephalin-derived peptides are the dominant forms in the adrenal peptidome.
- Extended M-ENK variants (e.g., YGGFM-RF, YGGFM-RGL) and other peptides (Peptide E, BAM-18, BAM-22) were actively released upon stimulation.
Conclusions:
- Opioid peptide release from adrenal chromaffin cells is temporally complex and involves diverse peptide forms.
- The developed workflow provides a versatile tool for studying opioid signaling in physiological systems.
- This research enhances understanding of the chemical diversity and temporal dynamics of opioid signaling molecules.
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