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Ca(2+)-activated Cl(-) currents in the murine vomeronasal organ enhance neuronal spiking but are dispensable for male-male aggression.

Item Type:Article
Title:Ca(2+)-activated Cl(-) currents in the murine vomeronasal organ enhance neuronal spiking but are dispensable for male-male aggression.
Creators Name:Münch, J. and Billig, G. and Huebner, C.A. and Leinders-Zufall, T. and Zufall, F. and Jentsch, T.J.
Abstract:Ca(2+)-activated Cl(-) currents have been observed in many physiological processes, including sensory transduction in mammalian olfaction. The olfactory vomeronasal (or Jacobson's) organ (VNO) detects molecular cues originating from animals of the same species or from predators. It then triggers innate behaviors such as aggression, mating, or flight. In the VNO, Ca(2+)-activated Cl(-) channels (CaCCs) are thought to amplify the initial pheromone-evoked receptor potential by mediating a depolarizing Cl(-) efflux. Here, we confirmed the co-localization of the Ca(2+)-activated Cl(-) channels anoctamin 1 (Ano1, also called TMEM16A) and Ano2 (TMEM16B) in microvilli of apically and basally located vomeronasal sensory neurons (VSNs) and their absence in supporting cells of the VNO. Both channels were expressed as functional isoforms capable of giving rise to Ca(2+)-activated Cl(-) currents. While these currents persisted in the VNOs of mice lacking Ano2, they were undetectable in olfactory neuron-specific Ano1 knock-out mice irrespective of the presence of Ano2. The loss of Ca(2+)-activated Cl(-) currents resulted in diminished spontaneous and drastically reduced pheromone-evoked spiking of VSNs. Although this indicated an important role of anoctamin channels in VNO signal amplification, the lack of this amplification did not alter VNO-dependent male-male territorial aggression in olfactory Ano1/Ano2 double knock-out mice. We conclude that Ano1 mediates the bulk of Ca(2+)-activated Cl(-) currents in the VNO and that Ano2 plays only a minor role. Furthermore, vomeronasal signal amplification by CaCCs appears to be dispensable for the detection of male-specific pheromones and for near-normal aggressive behavior in mice.
Keywords:TMEM16A, TMEM16B, Electrophysiology, Chloride Channel, Patch Clamp, Signal Transduction, Neurobiology, Animals, Mice
Source:Journal of Biological Chemistry
ISSN:1083-351X
Publisher:American Society for Biochemistry and Molecular Biology (U.S.A.)
Volume:293
Number:26
Page Range:10392-10403
Date:29 June 2018
Official Publication:https://doi.org/10.1074/jbc.RA118.003153
External Fulltext:View full text on PubMed Central
PubMed:View item in PubMed

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