Universität zu Köln

Turzo, Maurizio, Spoehr, Fabian A., Felix, Lasitschka, Weigand, Markus A. and Busch, Cornelius J. . Kv7 channel inhibition increases hypoxic pulmonary vasoconstriction in endotoxemic mouse lungs. Exp. Lung Res.. PHILADELPHIA: TAYLOR & FRANCIS INC. ISSN 1521-0499

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Abstract

Purpose Hypoxic pulmonary vasoconstriction (HPV) regulates regional pulmonary blood flow in order to match regional ventilation to preserve arterial oxygenation. HPV is impaired in patients with sepsis or acute respiratory distress syndrome (ARDS). Endotoxemic mice show reduced HPV and recent evidence suggests a central role of voltage gated potassium channel 7 (Kv7) in regulating HPV. Therefore, we tested the hypothesis if Kv7 is induced and inhibition of Kv7 increases HPV in endotoxemia. Materials and Methods Isolated lungs of LPS-pretreated and untreated animals were perfused with and without specific inhibitors of Kv7 (linopirdine (LI) 0, 0.1, 1 and 10 mu M) or Kv7.1 (HMR1556 100 nM). Pulmonary artery pressure (PAP) during normoxic (FiO(2)0.21) as well as hypoxic (FiO(2)0.01) ventilation were obtained. Expressions of Kv7 composing (KCNQ1-5) as well as auxiliary subunits (KCNE1-5) were measured in mouse lungs with and without endotoxemia. Results HPV was impaired in lungs from LPS mice (16 +/- 7% vs 105 +/- 13% control, p < 0.05). Perfusion of control lungs with 10 mu M LI or 100 nM HMR1556 did not affect HPV (LI 105 +/- 12% vs 105 +/- 13% vehicle, HMR1556 100 +/- 6% vs 98 +/- 26%, P = NS). In LPS mice perfusion with 10 mu M LI (74.2 +/- 7% vs. 16 +/- 7% vehicle, P < 0.05) or HMR1556 100 nM augmented HPV (74 +/- 28% vs. 15 +/- 17% vehicle, P < 0.05). KCNQ1, 4 and 5 gene- and protein expressions as well as KCNE1, 2 and 4 gene expressions were unaltered in endotoxemic lungs. KCNE3 gene and protein expressions were increased in lungs of LPS treated mice (3.1 +/- 1.3-fold and 1.8 +/- 0.3-fold, respectively, P < 0.05 for both). Conclusions Endotoxemia does not alter KCNQ1, 4 and 5 gene and protein expressions but increases pulmonary KCNE3 gene and protein expression. In isolated perfused endotoxemic mouse lungs, perfusion with 10 mu M LI or 100 nM HMR1556 augments HPV.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Turzo, Maurizio UNSPECIFIED UNSPECIFIED UNSPECIFIED Spoehr, Fabian A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Felix, Lasitschka UNSPECIFIED UNSPECIFIED UNSPECIFIED Weigand, Markus A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Busch, Cornelius J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-318954
DOI:	10.1080/01902148.2020.1818888
Journal or Publication Title:	Exp. Lung Res.
Publisher:	TAYLOR & FRANCIS INC
Place of Publication:	PHILADELPHIA
ISSN:	1521-0499
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language KCNQ POTASSIUM CHANNELS; NITRIC-OXIDE SYNTHASE; SELECTIVE-INHIBITION; SUBUNIT EXPRESSION; K(V)7 CHANNELS; BETA-SUBUNIT; K+ CHANNEL; MODULATION; RESPONSES; ARTERIES Multiple languages Respiratory System Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31895