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Ahmed SR, Liu E, Yip A, Lin Y, Balaban E, Pompeiano M. Novel localizations of TRPC5 channels suggest novel and unexplored roles: A study in the chick embryo brain. Dev Neurobiol 2021; 82:41-63. [PMID: 34705331 DOI: 10.1002/dneu.22857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 08/16/2021] [Accepted: 10/14/2021] [Indexed: 11/06/2022]
Abstract
Mammalian TRPC5 channels are predominantly expressed in the brain, where they increase intracellular Ca2+ and induce depolarization. Because they augment presynaptic vesicle release, cause persistent neural activity, and show constitutive activity, TRPC5s could play a functional role in late developmental brain events. We used immunohistochemistry to examine TRPC5 in the chick embryo brain between 8 and 20 days of incubation, and provide the first detailed description of their distribution in birds and in the whole brain of any animal species. Stained areas substantially increased between E8 and E16, and staining intensity in many areas peaked at E16, a time when chick brains first show organized patterns of whole-brain metabolic activation like what is seen consistently after hatching. Areas showing cell soma staining match areas showing Trpc5 mRNA or protein in adult rodents (cerebral cortex, hippocampus, amygdala, cerebellar Purkinje cells). Chick embryos show protein staining in the optic tectum, cerebellar nuclei, and several brainstem nuclei; equivalent areas in the Allen Institute mouse maps express Trpc5 mRNA. The strongest cell soma staining was found in a dorsal hypothalamic area (matching a group of parvicellular arginine vasotocin neurons and a pallial amygdalohypothalamic cell corridor) and the vagal motor complex. Purkinje cells showed strong dendritic staining at E20. Unexpectedly, we also describe neurite staining in the septum, several hypothalamic nuclei, and a paramedian raphe area; the strongest neurite staining was in the median eminence. These novel localizations suggest new unexplored TRPC5 functions, and possible roles in late embryonic brain development.
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Affiliation(s)
- Sharifuddin Rifat Ahmed
- Department of Psychology, McGill University, Montreal, Quebec, Canada.,Faculté de médecine, Université de Montréal, Montréal, QC, H3T 1J4, Canada
| | - Elise Liu
- Department of Psychology, McGill University, Montreal, Quebec, Canada.,Institute du Cerveau - ICM, Paris Brain Institute, Paris, 75013, France
| | - Alissa Yip
- Department of Psychology, McGill University, Montreal, Quebec, Canada
| | - Yuqi Lin
- Department of Psychology, McGill University, Montreal, Quebec, Canada.,Institute of Medical Science, University of Toronto, Toronto, ON, M5S 1A8, Canada
| | - Evan Balaban
- Department of Psychology, McGill University, Montreal, Quebec, Canada.,Department of Bioengineering and Aerospace Engineering, Carlo III University of Madrid, Avda. de la Universidad 30, Leganés, Madrid, E-28911, Spain
| | - Maria Pompeiano
- Department of Psychology, McGill University, Montreal, Quebec, Canada.,Department of Bioengineering and Aerospace Engineering, Carlo III University of Madrid, Avda. de la Universidad 30, Leganés, Madrid, E-28911, Spain
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