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Dominance hierarchies are key to social organization in group-living species, requiring individuals to recognize their own and others' ranks. This is particularly complex for intermediate-ranking animals, who navigate interactions with higher- and lower-ranking individuals. Using in situ hybridization, we examined how the brains of intermediate-ranked mice in hierarchies respond to dominant and subordinate stimuli by labeling activity-induced immediate early genes and neuronal markers.
View Article and Find Full Text PDFProgressive iron overload in middle-aged mice impairs olfactory function, triggers lipid oxidation and induces apoptosis.
Front Pharmacol
December 2024
Laboratory of Experimental Animal Disease Model, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China.
Introduction: This study aims to investigate the progressive impact of chronic iron overload on the olfactory bulb, a region significantly affected in early neurodegenerative diseases like Parkinson's and Alzheimer's. The focus is on understanding how iron accumulation leads to oxidative stress, mitochondrial dysfunction, and neuronal damage over time in middle-aged mice.
Method: The mice were continuously administered FC for a duration of 16 weeks, and the olfactory behavior of the mice was observed at intervals of 4 weeks.
Impact of posterior septectomy on olfaction in endoscopic endonasal transsphenoidal surgery.
PLoS One
January 2025
Department of Otolaryngology-Head and Neck Surgery, Seoul Saint Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
Background: Endoscopic endonasal transsphenoidal surgery is widely used to resect pituitary adenomas, yet its impact on olfactory function after resection of the posterosuperior nasal septum remains a concern. To optimize surgical techniques to preserve olfactory function, it is essential to understand the relationship between the extent of septal resection and olfactory outcomes.
Methods: This retrospective study analyzed 295 patients who underwent pituitary adenoma surgery.
Social odors drive hippocampal CA2 place cell responses to social stimuli.
Prog Neurobiol
December 2024
Center for Learning and Memory, The University of Texas at Austin, Austin, TX 78712; Department of Neuroscience, The University of Texas at Austin, Austin, TX 78712; Institute for Neuroscience, The University of Texas at Austin, Austin, TX 78712. Electronic address:
Hippocampal region CA2 is essential for social memory processing. Interaction with social stimuli induces changes in CA2 place cell firing during active exploration and sharp wave-ripples during rest following a social interaction. However, it is unknown whether these changes in firing patterns are caused by integration of multimodal social stimuli or by a specific sensory modality associated with a social interaction.
View Article and Find Full Text PDFAssociative learning of non-nestmate cues improves enemy recognition in ants.
Curr Biol
December 2024
Department of Evolutionary Biology and Ecology, Institute of Biology I, University of Freiburg, Hauptstraße 1, 79104 Freiburg, Germany. Electronic address:
Recognition protects biological systems at all scales, from cells to societies. Social insects recognize their nestmates by colony-specific olfactory labels that individuals store as neural templates in their memory. Throughout an ant's life, learning continuously shapes the nestmate recognition template to keep up with the constant changes in colony labels.
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