Katrina Choe

Oxytocin neurons in the anterior and posterior paraventricular nucleus have distinct behavioral functions and electrophysiological profiles Neuropsychopharmacology - Oxytocin neurons in the anterior and posterior paraventricular nucleus have distinct behavioral functions and electrophysiological profiles

#ThisWeekInNPP

This study reports that manipulating oxytocin synthesis in anterior vs posterior paraventricular hypothalamic neurons produced opposing effects on social approach, while electrophysiological differences revealed functional heterogeneity

Save the date for the annual "Neural Circuits and Behaviour" satellite conference at the Canadian Association for Neuroscience annual meeting, cohosted by @franklandlab.bsky.social and myself on May 18, 2026. We have a great speaker lineup and will be selecting 4 trainees talks from our registrants!

What can you discover with one powerful, streamlined pipeline for 3D #SpatialBiology?

Researchers in @katrinachoe.bsky.social's lab used whole-brain labeling, clearing, imaging, and ML-based cell detection to quantify OXT+ neurons across part of the hypothalamus called the PVN 🧵 (1/4)

You’ve helped shape our lab in every way possible. Forever grateful for your contributions and also so many fun memories ❤️

I am so proud to announce that I successfully defended my PhD yesterday in front of all the amazing exam members, family and lab family! Being the 1st PhD in the lab wasn't easy but so rewarding! Thank you @katrinachoe.bsky.social for making me love oxytocin so much and for believing in me🥂🥳

Yesterday marked a huge milestone for our lab - our first PhD defense ever, and a successful one! Couldn’t be prouder of Dr. Sandoval. Congratulations @katycelina.bsky.social 🎉 🥳

Heading to San Diego to attend #SfN25! Excited to witness some jaw-dropping neuroscience 😲 Reach out if you’ll be there, would love to say hi!

What a tragic loss.. My deepest condolences

Thanks for your visit, awesome talk as always! @drjkhokhar.bsky.social

Can’t wait for @drjkhokhar.bsky.social’s visit tomorrow! Don’t miss his talk at 2:30pm, PC 155!

Seminar room with Charles Bourque introducing keynote speaker Quentin Pittman

Fantastic weekend at the Hypothalamic Mechanisms Retreat organized by @katrinachoe.bsky.social & Mijail Rojas-Carvajal ! Unfortunately didnt take too many pictures apart from the 'family tree' but it was so nice to share lots of unpublished work and get some critical feedback!

#eNeuro: Using fiber photometry in mice, @katycelina.bsky.social‬, Rychlik, and @katrinachoe.bsky.social‬ show oxytocin neurons and astrocytes respond to social and stress cues differently depending on the situation and sex of the animal. @mcmastermedia.bsky.social‬
vist.ly/3n7y6tc

Awesome news -congrats Jibran!

Assistant or associate professor-researcher in Neuroscience related to neurological disorders and/or neural regeneration and precision health Description  The Neuroscience Research Axis of the CRCHUM and the Department of Neuroscience of the UdeM are inviting applications for a position of assistant or associate professor-researcher in neur...

Call for an Assistant / Associate Prof. just opened at the @crchum.bsky.social in the Neuroscience Axis !

www.chumontreal.qc.ca/en/emplois/a...

I am delighted to share a new review article from Aishwarya Patwardhan and me, titled "The Social Salience Network Hypothesis of Autism: Disrupted Network Activity, Oxytocin Signaling, and Implications for Social Symptoms" published in Progress in Neurobiology! doi.org/10.1016/j.pn...

Thanks Maithe!

Thanks Ciaran! See you at CAN

Thanks Argel!

Thanks Stephen

Thanks Caroline 🥰

Finally, thanks to Andrea Lawson from @mcmastermedia.bsky.social for this nice writeup on our study! brighterworld.mcmaster.ca/articles/bra...

This one is especially meaningful - the first paper from our lab led by the first PhD student @katycelina.bsky.social and the first MSc student Joshua Rychlik. So proud of their hard work, and thankful for everyone who helped along the way including our funding sources ❤️

Thrilled to share that our paper is published! With this study, we reveal calcium dynamics of PVN oxytocin neurons and astrocytes in mice during social investigation and looming shadow threat, simultaneously imaged in vivo using two-colour fiber photometry. 🐭 🧠 🟢 🔴 www.eneuro.org/content/12/5...

Jam-packed past few weeks celebrating @katycelina.bsky.social’s paper acceptance, a new paper submission, hosting Dr. Toru Takumi, and attending #SOBP2025 in Toronto with @neuroash.bsky.social @siyaoneuro.bsky.social and #SONA2025 at @westernu.bsky.social with (almost) the whole lab crew! 🥳🍾🤩

So proud of you! 👏🥰

It was so nice to catch up! Your kitty isn’t the only one drooling over the mountain of crabs 🤤🏔️ 🦀

We are looking for an outstanding postdoctoral researcher to join our team at McGill University. The Sjöström lab studies neocortical circuits, with a focus on synaptic plasticity, NMDA receptor signaling, 2-photon optogenetics, and advanced 2-photon imaging. We are particularly interested in candidates with strong expertise in whole-cell patch-clamp electrophysiology and/or 2-photon imaging, and a solid track record of relevant publications. Applicants should be experienced with whole-cell recordings and/or cutting-edge imaging approaches. Responsibilities will include performing experiments, analyzing and presenting data locally and internationally, writing manuscripts, and occasionally mentoring junior lab members. Our lab is based at the Research Institute of the McGill University Health Centre, in vibrant, multicultural Montreal—a city that offers exceptional quality of life. McGill and its neighbouring universities form one of the most dynamic neuroscience communities in the world. For examples of our current directions, see: • Chou et al The Innovation 2025, www.cell.com/the-innovation/fulltext/S2666-6758(24)00173-5 • Wong et al Neuron 2024, www.cell.com/neuron/fulltext/S0896-6273(23)00767-5 The position is fully funded with a competitive salary. Candidates are also expected to apply for external funding, for which we provide strong support. Opportunities are available for both Canadian and international applicants. To apply, please send a Letter of Intent, CV, brief research statement, and contact information for three referees to Dr. Jesper Sjöström (jesper.sjostrom@mcgill.ca). In the subject line, include "Postdoc" followed by your name. Application deadline: July 31, 2025. Website: http://plasticity.muhc.mcgill.ca McGill University is committed to diversity and equity in employment.

🧪 The Sjöström Lab in Montreal is looking for a postdoc! We study cortical circuits, synaptic plasticity, and NMDAR signalling using custom 2-photon microscopy and optogenetics. We seek candidates with strong patch-clamp and/or 2-photon imaging expertise, and a relevant publication track record.

I have an opening in my lab for a postdoctoral fellow to work on projects that relate to the mechanisms of neurotransmitter release by dopamine neurons and/or on how inflammatory signals infuence the functionning of these neurons. Please share.

Fun times at #SOBP2025 with @gisellavetere.bsky.social @franklandlab.bsky.social Sheena Josselyn, Satoshi Kida, and Jessie Muir

A hypothalamic circuit underlying the dynamic control of social homeostasis Nature - New data on brain-wide circuits centred around two interconnected hypothalamic neuron populations provide significant mechanistic insights into the emergence of social need during social...

A hypothalamic circuit underlying the dynamic control of social homeostasis rdcu.be/ei6To - the neuroscience of loneliness... (in mice) 🐭😥