Brain‐wide mapping of efferent projections of glutamatergic (Onecut3<sup>+</sup>) neurons in the lateral mouse hypothalamus
(2023) Acta Physiologica — Vol. 238, n° 3, p. 1 (2023)
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FC-2023-Brain-widemappingofefferentprojectionsofglutamatergicOnecut3neuronsinthelateralmousehypothalamus.pdf
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- Authors
Keimpema, Erik 
- Abstract
- Aim This study mapped the spatiotemporal positions and connectivity of Onecut3+ neuronal populations in the developing and adult mouse brain. Methods We generated fluorescent reporter mice to chart Onecut3+ neurons for brain-wide analysis. Moreover, we crossed Onecut3-iCre and Mapt-mGFP (Tau-mGFP) mice to visualize axonal projections. A dual Cre/Flp-dependent AAV construct in Onecut3-iCre cross-bred with Slc17a6-FLPo mice was used in an intersectional strategy to map the connectivity of glutamatergic lateral hypothalamic neurons in the adult mouse. Results We first found that Onecut3 marks a hitherto undescribed Slc17a6+/Vglut2+ neuronal cohort in the lateral hypothalamus, with the majority expressing thyrotropin-releasing hormone. In the adult, Onecut3+/Vglut2+ neurons of the lateral hypothalamus had both intra- and extrahypothalamic efferents, particularly to the septal complex and habenula, where they targeted other cohorts of Onecut3+ neurons and additionally to the neocortex and hippocampus. This arrangement suggests that intrinsic reinforcement loops could exist for Onecut3+ neurons to coordinate their activity along the brain's midline axis. Conclusion We present both a toolbox to manipulate novel subtypes of hypothalamic neurons and an anatomical arrangement by which extrahypothalamic targets can be simultaneously entrained.
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Citations
Zupančič, M., Tretiakov, E., Máté, Z., Erdélyi, F., Szabó, G., Clotman, F., Hökfelt, T., Harkany, T., & Keimpema, E. (2023). Brain‐wide mapping of efferent projections of glutamatergic (Onecut3<sup>+</sup>) neurons in the lateral mouse hypothalamus. Acta Physiologica, 238(3), 1. https://doi.org/10.1111/apha.13973 (Original work published 2023)