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Updated: Jun 8, 2026
High-resolution Spatiotemporal Analysis of Receptor Dynamics by Single-molecule Fluorescence Microscopy
Published on: July 25, 2014
Fluorescent Peptide Tracers for Simultaneous Oxytocin Receptor Activation and Visualization
Monika Perisic Böhm1,2, Predrag Kalaba1, Rachel S Gormal3
1Institute of Biological Chemistry, Faculty of Chemistry, University of Vienna, Vienna, Austria.
Abstract:
The oxytocin receptor (OTR) regulates critical physiological functions and has been implicated in a range of diseases, including psychiatric and neurodevelopmental disorders such as autism spectrum disorder. However, a lack of reliable molecular tools hampers the progress in understanding OTR's mechanistic roles in (patho)physiological processes. In this work, we addressed this gap and developed potent, selective, and bright fluorescent peptide tracers that enable precise spatial and functional investigations of OTR actions. Our tracers showed efficient OTR labeling, activation, and internalization in cellular bioassays in both live and fixed overexpression and primary cell systems, including those subjected to immunocytochemical protocols, highlighting their versatility as reliable new imaging tools. Additionally, they facilitated single-molecule tracking of OTR with live-cell super-resolution microscopy and were able to separate OTR-positive cells from mixed oxytocin and vasopressin receptor-containing cell populations via fluorescence-activated cell sorting, underscoring their wider scope for live-cell applications. In summary, we developed versatile fluorescent tracers based on the endogenous ligand oxytocin for both live-cell and post-hoc imaging that have additional functional capabilities beyond traditional antibody labeling, offering new avenues to explore OTR's role in health and disease.
Insights
Researchers developed novel fluorescent peptide tracers for the oxytocin receptor (OTR). These tools enable precise imaging and functional studies of OTR, advancing research into OTR
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- The oxytocin receptor (OTR) plays a crucial role in physiological functions and is linked to diseases like autism spectrum disorder.
- Existing molecular tools for studying OTR are limited, hindering research into its roles in health and disease.
Purpose of the Study:
- To develop novel, reliable molecular tools for investigating oxytocin receptor (OTR) function and localization.
- To create fluorescent peptide tracers for precise spatial and functional analysis of OTR actions.
Main Methods:
- Development of potent, selective, and bright fluorescent peptide tracers based on oxytocin.
- Testing tracers in cellular bioassays (live and fixed cells, overexpression and primary systems).
- Utilizing live-cell super-resolution microscopy for single-molecule tracking and fluorescence-activated cell sorting (FACS).
Main Results:
- Fluorescent tracers demonstrated efficient OTR labeling, activation, and internalization in various cell systems.
- Tracers are compatible with immunocytochemical protocols, showing versatility for imaging.
- Single-molecule tracking and FACS successfully analyzed OTR dynamics and cell populations.
Conclusions:
- Novel fluorescent tracers provide versatile tools for both live-cell and post-hoc imaging of OTR.
- These tracers offer functional capabilities beyond traditional methods, enabling new research avenues.
- The developed tools will advance the understanding of OTR's role in physiological processes and diseases.
