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Gestreau C, Heitzmann D, Thomas J, Dubreuil V, Bandulik S, Reichold M, Bendahhou S, Pierson P, Sterner C, Peyronnet-Roux J, Benfriha C, Tegtmeier I, Ehnes H, Georgieff M, Lesage F, Brunet JF, Goridis C, Warth R, Barhanin J. Task2 potassium channels set central respiratory CO2 and O2 sensitivity. Proc Natl Acad Sci U S A 2010; 107:2325-30. [PMID: 20133877 PMCID: PMC2836670 DOI: 10.1073/pnas.0910059107] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Task2 K(+) channel expression in the central nervous system is surprisingly restricted to a few brainstem nuclei, including the retrotrapezoid (RTN) region. All Task2-positive RTN neurons were lost in mice bearing a Phox2b mutation that causes the human congenital central hypoventilation syndrome. In plethysmography, Task2(-/-) mice showed disturbed chemosensory function with hypersensitivity to low CO(2) concentrations, leading to hyperventilation. Task2 probably is needed to stabilize the membrane potential of chemoreceptive cells. In addition, Task2(-/-) mice lost the long-term hypoxia-induced respiratory decrease whereas the acute carotid-body-mediated increase was maintained. The lack of anoxia-induced respiratory depression in the isolated brainstem-spinal cord preparation suggested a central origin of the phenotype. Task2 activation by reactive oxygen species generated during hypoxia could silence RTN neurons, thus contributing to respiratory depression. These data identify Task2 as a determinant of central O(2) chemoreception and demonstrate that this phenomenon is due to the activity of a small number of neurons located at the ventral medullary surface.
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MESH Headings
- Animals
- Animals, Newborn
- Brain Stem/pathology
- Brain Stem/physiology
- Brain Stem/physiopathology
- Carbon Dioxide/physiology
- Chemoreceptor Cells/pathology
- Chemoreceptor Cells/physiology
- Disease Models, Animal
- Female
- Homeodomain Proteins/genetics
- Homeodomain Proteins/physiology
- Humans
- Hypercapnia/physiopathology
- Hypoxia/physiopathology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Mutant Strains
- Oxygen/physiology
- Plethysmography, Whole Body
- Potassium Channels, Tandem Pore Domain/deficiency
- Potassium Channels, Tandem Pore Domain/genetics
- Potassium Channels, Tandem Pore Domain/physiology
- Pregnancy
- Respiratory Center/physiology
- Respiratory Physiological Phenomena
- Sleep Apnea, Central/etiology
- Sleep Apnea, Central/genetics
- Sleep Apnea, Central/physiopathology
- Transcription Factors/deficiency
- Transcription Factors/genetics
- Transcription Factors/physiology
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Affiliation(s)
- Christian Gestreau
- Department of Neurovegetative Physiology, Centre National de la Recherche Scientifique, Université Paul Cézanne, 13397 Marseille, France;
| | - Dirk Heitzmann
- Institute of Physiology, University of Regensburg, 93053 Regensburg, Germany;
- Department of Internal Medicine, Nephrologyand Rheumatology, University of Muenster, 48149 Muenster, Germany;
| | - Joerg Thomas
- Department of Anaesthesiology, University of Ulm, 89075 Ulm, Germany;
| | - Véronique Dubreuil
- Département de Biologie, Ecole Normale Supérieure, Centre National de la Recherche Scientifique, 75005 Paris, France; and
| | - Sascha Bandulik
- Institute of Physiology, University of Regensburg, 93053 Regensburg, Germany;
| | - Markus Reichold
- Institute of Physiology, University of Regensburg, 93053 Regensburg, Germany;
| | - Saïd Bendahhou
- Transport Ionique Aspects Normaux et Pathologiques, Centre National de la Recherche Scientifique, and Faculté des Sciences, Université de Nice Sophia Antipolis, 06108 Nice Cedex, France
| | - Patricia Pierson
- Transport Ionique Aspects Normaux et Pathologiques, Centre National de la Recherche Scientifique, and Faculté des Sciences, Université de Nice Sophia Antipolis, 06108 Nice Cedex, France
| | - Christina Sterner
- Institute of Physiology, University of Regensburg, 93053 Regensburg, Germany;
| | - Julie Peyronnet-Roux
- Department of Neurovegetative Physiology, Centre National de la Recherche Scientifique, Université Paul Cézanne, 13397 Marseille, France;
| | - Chérif Benfriha
- Department of Neurovegetative Physiology, Centre National de la Recherche Scientifique, Université Paul Cézanne, 13397 Marseille, France;
| | - Ines Tegtmeier
- Institute of Physiology, University of Regensburg, 93053 Regensburg, Germany;
| | - Hannah Ehnes
- Institute of Physiology, University of Regensburg, 93053 Regensburg, Germany;
| | - Michael Georgieff
- Department of Anaesthesiology, University of Ulm, 89075 Ulm, Germany;
| | - Florian Lesage
- Institut de Pharmacologie Moléculaire et Cellulaire, Centre National de la Recherche Scientifique, and Université de Nice Sophia Antipolis, 06560 Valbonne, France;
| | - Jean-Francois Brunet
- Département de Biologie, Ecole Normale Supérieure, Centre National de la Recherche Scientifique, 75005 Paris, France; and
| | - Christo Goridis
- Département de Biologie, Ecole Normale Supérieure, Centre National de la Recherche Scientifique, 75005 Paris, France; and
| | - Richard Warth
- Institute of Physiology, University of Regensburg, 93053 Regensburg, Germany;
| | - Jacques Barhanin
- Transport Ionique Aspects Normaux et Pathologiques, Centre National de la Recherche Scientifique, and Faculté des Sciences, Université de Nice Sophia Antipolis, 06108 Nice Cedex, France
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