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Expression of the cold thermoreceptor TRPM8 in rodent brain thermoregulatory circuits
Author(s) -
Ordás Purificación,
HernándezOrtego Pablo,
Vara Hugo,
FernándezPeña Carlos,
Reimúndez Alfonso,
MorenillaPalao Cruz,
GuadañoFerraz Ana,
Gomis Ana,
Hoon Mark,
Viana Félix,
Señarís Rosa
Publication year - 2021
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/cne.24694
Subject(s) - trpm8 , biology , neuroscience , transient receptor potential channel , sensory system , electrophysiology , central nervous system , in situ hybridization , thermoreceptor , brainstem , anatomy , trpv1 , receptor , gene expression , biochemistry , gene
The cold‐ and menthol‐activated ion channel transient receptor potential channel subfamily M member 8 (TRPM8) is the principal detector of environmental cold in mammalian sensory nerve endings. Although it is mainly expressed in a subpopulation of peripheral sensory neurons, it has also been identified in non‐neuronal tissues. Here, we show, by in situ hybridization (ISH) and by the analysis of transgenic reporter expression in two different reporter mouse strains, that TRPM8 is also expressed in the central nervous system. Although it is present at much lower levels than in peripheral sensory neurons, we found cells expressing TRPM8 in restricted areas of the brain, especially in the hypothalamus, septum, thalamic reticular nucleus, certain cortices and other limbic structures, as well as in some specific nuclei in the brainstem. Interestingly, positive fibers were also found traveling through the major limbic tracts, suggesting a role of TRPM8‐expressing central neurons in multiple aspects of thermal regulation, including autonomic and behavioral thermoregulation. Additional ISH experiments in rat brain demonstrated a conserved pattern of expression of this ion channel between rodent species. We confirmed the functional activity of this channel in the mouse brain using electrophysiological patch‐clamp recordings of septal neurons. These results open a new window in TRPM8 physiology, guiding further efforts to understand potential roles of this molecular sensor within the brain.