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Brain Struct Funct. 2018 Apr;223(3):1537-1564. doi: 10.1007/s00429-017-1559-z. Epub 2017 Nov 22.

Modulation of thalamocortical oscillations by TRIP8b, an auxiliary subunit for HCN channels.

Author information

1
Institut für Physiologie I, Westfälische Wilhelms-Universität, 48149, Münster, Germany. zobeiri@uni-muenster.de.
2
Institut für Physiologie I, Westfälische Wilhelms-Universität, 48149, Münster, Germany.
3
Davee Department of Neurology and Clinical Neurosciences and Department of Physiology, Feinberg School of Medicine, Northwestern University, 60611Chicago, USA.
4
Department of Neurology and Institute of Translational Neurology, Westfälische Wilhelms-Universität, 48149, Münster, Germany.
5
Institute of Complex Systems, Zelluläre Biophysik (ICS-4), Forschungszentrum Jülich, 52425, Jülich, Germany.
6
Donders Centre for Cognition, Radboud University, 6500, Nijmegen, The Netherlands.
7
Institut für Physiologie I, Westfälische Wilhelms-Universität, 48149, Münster, Germany. tbudde@uni-muenster.de.

Abstract

Hyperpolarization-activated cyclic nucleotide-gated cation (HCN) channels have important functions in controlling neuronal excitability and generating rhythmic oscillatory activity. The role of tetratricopeptide repeat-containing Rab8b-interacting protein (TRIP8b) in regulation of hyperpolarization-activated inward current, I h, in the thalamocortical system and its functional relevance for the physiological thalamocortical oscillations were investigated. A significant decrease in I h current density, in both thalamocortical relay (TC) and cortical pyramidal neurons was found in TRIP8b-deficient mice (TRIP8b-/-). In addition basal cAMP levels in the brain were found to be decreased while the availability of the fast transient A-type K+ current, I A, in TC neurons was increased. These changes were associated with alterations in intrinsic properties and firing patterns of TC neurons, as well as intrathalamic and thalamocortical network oscillations, revealing a significant increase in slow oscillations in the delta frequency range (0.5-4 Hz) during episodes of active-wakefulness. In addition, absence of TRIP8b suppresses the normal desynchronization response of the EEG during the switch from slow-wave sleep to wakefulness. It is concluded that TRIP8b is necessary for the modulation of physiological thalamocortical oscillations due to its direct effect on HCN channel expression in thalamus and cortex and that mechanisms related to reduced cAMP signaling may contribute to the present findings.

KEYWORDS:

Delta oscillations; HCN channels; I A; In vivo; Knockout mice; TRIP8b; Thalamocortical oscillations

PMID:
29168010
PMCID:
PMC5869905
DOI:
10.1007/s00429-017-1559-z
[Indexed for MEDLINE]
Free PMC Article

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