UQ creates light-activated oxytocin switch
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- University of Queensland researchers built a molecular 'light switch' for oxytocin that releases the neuropeptide when activated by light at a specific wavelength, letting researchers observe effects on individual synapses, neurons, and neuronal circuits.
- Professor Markus Muttenthaler of UQ's Institute for Molecular Bioscience said the tool fills a gap — scientists previously lacked ways to study oxytocin's effects without interference from neighboring brain areas.
- The photocaged probes can be activated at the individual cell level with high precision and produce no toxic by-products, according to the researchers.
- The study, published in Angewandte Chemie International Edition, also targets vasopressin, a closely related neuropeptide involved in similar signaling pathways.
- Oxytocin plays a key role in trust, bonding, parenting, emotional regulation, empathy, learning, and memory, with signaling changes linked to autism, anxiety, depression, addiction, PTSD, schizophrenia, and psychotic disorders.
- Muttenthaler said the same strategy can be adapted to study many other neuropeptides, placing the work within a wider effort to understand how the brain communicates — including in tissues where genetic approaches are difficult or impossible.
Why it matters: The tool gives researchers a way to isolate oxytocin's effects on specific brain regions for the first time without relying on genetic engineering, potentially opening new therapeutic pathways for conditions like autism, PTSD, and schizophrenia where oxytocin signaling is disrupted. Its adaptability to other neuropeptides broadens the reach well beyond social behavior, giving neuroscience a generally applicable optochemical probe.
