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Brain Res. 1998 May 25;794(1):162-5.

K+-current modulated by PO2 in type I cells in rat carotid body is not a chemosensor.

Author information

1
Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6085, USA.

Abstract

According to the membrane channel hypothesis of carotid body O2 chemoreception, hypoxia suppresses K+ currents leading to cell depolarization, [Ca2+]i rise, neurosecretion, increased neural discharge from the carotid body. We show here that tetraethylammonium (TEA) plus 4-aminopyridine (4-AP) which suppressed the Ca2+ sensitive and other K+ currents in rat carotid body type I cells, with and without low [Ca2+]o plus high [Mg2+]o, did not essentially influence low PO2 effects on [Ca2+]i and chemosensory discharge. Thus, hypoxia may suppress the K+ currents in glomus cells but K+ current suppression of itself does not lead to chemosensory excitation. Therefore, the hypothesis that K+-O2 current is linked to events in chemoreception is not substantiated. K+-O2 current is an epiphemenon which is not directly linked with O2 chemoreception.

PMID:
9630601
DOI:
10.1016/s0006-8993(98)00276-5
[Indexed for MEDLINE]

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