The role of TASK-2 channels in CO2 sensing in zebrafish (Danio rerio).

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
N KoudrinaK M Gilmour

Abstract

Peripheral chemosensitivity in fishes is thought to be mediated by serotonin-enriched neuroepithelial cells (NECs) that are localized to the gills of adults and the integument of larvae. In adult zebrafish (Danio rerio), branchial NECs are presumed to mediate the cardiorespiratory reflexes associated with hypoxia or hypercapnia, whereas in larvae, there is indirect evidence linking cutaneous NECs to hypoxic hyperventilation and hypercapnic tachycardia. No study yet has examined the ventilatory response of larval zebrafish to hypercapnia, and regardless of developmental stage, the signaling pathways involved in CO2 sensing remain unclear. In the mouse, a background potassium channel (TASK-2) contributes to the sensitivity of chemoreceptor cells to CO2. Zebrafish possess two TASK-2 channel paralogs, TASK-2 and TASK-2b, encoded by kcnk5a and kcnk5b, respectively. The present study aimed to determine whether TASK-2 channels are expressed in NECs of larval zebrafish and whether they are involved in CO2 sensing. Using immunohistochemical approaches, TASK-2 protein was observed on the surface of NECs in larvae. Exposure of larvae to hypercapnia caused cardiac and breathing frequencies to increase, and these responses were blunted in f...Continue Reading

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Citations

Feb 14, 2021·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·M C Hughes, S F Perry

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Methods Mentioned

BETA
antisense oligonucleotide
PCR
PCRs
electrophoresis
gene knockout

Software Mentioned

Nikon Elements
SigmaPlot
Primer Quest
CyberLink Power Director
ImageJ
SPSS
OligoAnalyzer
ImageLab

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