Structural Changes and Lack of HCN1 Channels in the Binaural Auditory Brainstem of the Naked Mole-Rat (Heterocephalus glaber). 2016

Nikodemus Gessele, and Elisabet Garcia-Pino, and Damir Omerbašić, and Thomas J Park, and Ursula Koch
Neurophysiology, Institute of Biology, Freie Universität Berlin, Berlin, Germany.

Naked mole-rats (Heterocephalus glaber) live in large eu-social, underground colonies in narrow burrows and are exposed to a large repertoire of communication signals but negligible binaural sound localization cues, such as interaural time and intensity differences. We therefore asked whether monaural and binaural auditory brainstem nuclei in the naked mole-rat are differentially adjusted to this acoustic environment. Using antibody stainings against excitatory and inhibitory presynaptic structures, namely the vesicular glutamate transporter VGluT1 and the glycine transporter GlyT2 we identified all major auditory brainstem nuclei except the superior paraolivary nucleus in these animals. Naked mole-rats possess a well structured medial superior olive, with a similar synaptic arrangement to interaural-time-difference encoding animals. The neighboring lateral superior olive, which analyzes interaural intensity differences, is large and elongated, whereas the medial nucleus of the trapezoid body, which provides the contralateral inhibitory input to these binaural nuclei, is reduced in size. In contrast, the cochlear nucleus, the nuclei of the lateral lemniscus and the inferior colliculus are not considerably different when compared to other rodent species. Most interestingly, binaural auditory brainstem nuclei lack the membrane-bound hyperpolarization-activated channel HCN1, a voltage-gated ion channel that greatly contributes to the fast integration times in binaural nuclei of the superior olivary complex in other species. This suggests substantially lengthened membrane time constants and thus prolonged temporal integration of inputs in binaural auditory brainstem neurons and might be linked to the severely degenerated sound localization abilities in these animals.

UI MeSH Term Description Entries
D008810 Mice, Inbred C57BL One of the first INBRED MOUSE STRAINS to be sequenced. This strain is commonly used as genetic background for transgenic mouse models. Refractory to many tumors, this strain is also preferred model for studying role of genetic variations in development of diseases. Mice, C57BL,Mouse, C57BL,Mouse, Inbred C57BL,C57BL Mice,C57BL Mice, Inbred,C57BL Mouse,C57BL Mouse, Inbred,Inbred C57BL Mice,Inbred C57BL Mouse
D001933 Brain Stem The part of the brain that connects the CEREBRAL HEMISPHERES with the SPINAL CORD. It consists of the MESENCEPHALON; PONS; and MEDULLA OBLONGATA. Brainstem,Truncus Cerebri,Brain Stems,Brainstems,Cerebri, Truncus,Cerebrus, Truncus,Truncus Cerebrus
D006624 Hippocampus A curved elevation of GRAY MATTER extending the entire length of the floor of the TEMPORAL HORN of the LATERAL VENTRICLE (see also TEMPORAL LOBE). The hippocampus proper, subiculum, and DENTATE GYRUS constitute the hippocampal formation. Sometimes authors include the ENTORHINAL CORTEX in the hippocampal formation. Ammon Horn,Cornu Ammonis,Hippocampal Formation,Subiculum,Ammon's Horn,Hippocampus Proper,Ammons Horn,Formation, Hippocampal,Formations, Hippocampal,Hippocampal Formations,Hippocampus Propers,Horn, Ammon,Horn, Ammon's,Proper, Hippocampus,Propers, Hippocampus,Subiculums
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001306 Auditory Pathways NEURAL PATHWAYS and connections within the CENTRAL NERVOUS SYSTEM, beginning at the hair cells of the ORGAN OF CORTI, continuing along the eighth cranial nerve, and terminating at the AUDITORY CORTEX. Auditory Pathway,Pathway, Auditory,Pathways, Auditory
D014020 Tissue Extracts Preparations made from animal tissues or organs (ANIMAL STRUCTURES). They usually contain many components, any one of which may be pharmacologically or physiologically active. Tissue extracts may contain specific, but uncharacterized factors or proteins with specific actions. Extracts, Tissue
D015153 Blotting, Western Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes. Immunoblotting, Western,Western Blotting,Western Immunoblotting,Blot, Western,Immunoblot, Western,Western Blot,Western Immunoblot,Blots, Western,Blottings, Western,Immunoblots, Western,Immunoblottings, Western,Western Blots,Western Blottings,Western Immunoblots,Western Immunoblottings
D018613 Microscopy, Confocal A light microscopic technique in which only a small spot is illuminated and observed at a time. An image is constructed through point-by-point scanning of the field in this manner. Light sources may be conventional or laser, and fluorescence or transmitted observations are possible. Confocal Microscopy,Confocal Microscopy, Scanning Laser,Laser Microscopy,Laser Scanning Confocal Microscopy,Laser Scanning Microscopy,Microscopy, Confocal, Laser Scanning,Confocal Laser Scanning Microscopy,Confocal Microscopies,Laser Microscopies,Laser Scanning Microscopies,Microscopies, Confocal,Microscopies, Laser,Microscopies, Laser Scanning,Microscopy, Laser,Microscopy, Laser Scanning,Scanning Microscopies, Laser,Scanning Microscopy, Laser
D019577 Mole Rats Any of several burrowing rodents of the families MURIDAE and Bathyergidae, found in eastern Europe, Africa, and Asia. They have short limbs, small eyes with permanently closed lids, and no tail. Three genera SPALAX (Muridae), Heterocephalus (Bathyergidae) and Cryptomys (Bathyergidae) are used frequently as experimental animals in biomedical research. (From Walker's Mammals of the World, 6th ed) Cryptomys,Heterocephalus,Mole-Rats,Molerats,Mole Rat,Mole-Rat,Molerat,Rat, Mole,Rats, Mole
D064428 Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels A subgroup of cyclic nucleotide-regulated ION CHANNELS of the superfamily of pore-loop cation channels that are opened by hyperpolarization rather than depolarization. The ion conducting pore passes SODIUM, CALCIUM, and POTASSIUM cations with a preference for potassium. Hyperpolarization Cyclic-Nucleotide Gated Ion Channels,HCN Pacemaker Channels,HCN1 Channel,HCN2 Channel,HCN2 Potassium Channel,HCN3 Channel,HCN4 Channel,Hyperpolarization Activated Cyclic Nucleotide-Gated Potassium Channel 2,Hyperpolarization Cyclic-Nucleotide Gated Cation Channel 1,Hyperpolarization Cyclic-Nucleotide Gated Cation Channel 3,Hyperpolarization Cyclic-Nucleotide Gated Cation Channel 4,Hyperpolarization-Activated Cation Channel,I(h) Cation Channels,I(h) Channels,Ih Cation Channels,Potassium-Sodium Hyperpolarization-Activated Cyclic Nucleotide-Gated Channel 2,Cation Channel, Hyperpolarization-Activated,Cation Channels, Ih,Channel, HCN1,Channel, HCN2,Channel, HCN2 Potassium,Channel, HCN3,Channel, HCN4,Channel, Hyperpolarization-Activated Cation,Channels, HCN Pacemaker,Channels, Ih Cation,Hyperpolarization Activated Cation Channel,Hyperpolarization Activated Cyclic Nucleotide Gated Channels,Hyperpolarization Activated Cyclic Nucleotide Gated Potassium Channel 2,Hyperpolarization Cyclic Nucleotide Gated Cation Channel 1,Hyperpolarization Cyclic Nucleotide Gated Cation Channel 3,Hyperpolarization Cyclic Nucleotide Gated Cation Channel 4,Hyperpolarization Cyclic Nucleotide Gated Ion Channels,Pacemaker Channels, HCN,Potassium Channel, HCN2,Potassium Sodium Hyperpolarization Activated Cyclic Nucleotide Gated Channel 2

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