The new HNO donor, 1-nitrosocyclohexyl acetate, increases contractile force in normal and β-adrenergically desensitized ventricular myocytes

TY - JOUR

T1 - The new HNO donor, 1-nitrosocyclohexyl acetate, increases contractile force in normal and β-adrenergically desensitized ventricular myocytes

AU - El-Armouche, Ali

AU - Wahab, Azadeh

AU - Wittköpper, Katrin

AU - Schulze, Thomas

AU - Böttcher, Felix

AU - Pohlmann, Lutz

AU - King, S Bruce

AU - DuMond, Jenna F

AU - Gerloff, Christian

AU - Böger, Rainer H

AU - Eschenhagen, Thomas

AU - Carrier, Lucie

AU - Donzelli, Sonia

N1 - Copyright © 2010 Elsevier Inc. All rights reserved.

PY - 2010/11/12

Y1 - 2010/11/12

N2 - Contractile dysfunction and diminished response to -adrenergic agonists are characteristics for failing hearts. Chemically donated nitroxyl (HNO) improves contractility in failing hearts and thus may have therapeutic potential. Yet, there is a need for pharmacologically suitable donors. In this study we tested whether the pure and long acting HNO donor, 1-nitrosocyclohexyl acetate (NCA), affects contractile force in normal and pathological ventricular myocytes (VMs) as well as in isolated hearts. VMs were isolated from mice either subjected to isoprenaline-infusion (ISO; 30 g/g per day) or to vehicle (0.9% NaCl) for 5 days. Sarcomere shortening and Ca2+ transients were simultaneously measured using the IonOptix system. Force of contraction of isolated hearts was measured by a Langendorff-perfusion system. NCA increased peak sarcomere shortening by+40-200% in a concentration-dependent manner (EC50 55 M). Efficacy and potency did not differ between normal and chronic ISO VMs, despite the fact that the latter displayed a markedly diminished inotropic response to acute -adrenergic stimulation with ISO (1 M). NCA (60 M) increased peak sarcomere shortening and Ca2+ transient amplitude by 200% and 120%, respectively, suggesting effects on both myofilament Ca2+ sensitivity and sarcoplasmic reticulum (SR) Ca2+ cycling. Importantly, NCA did not affect diastolic Ca2+ or SR Ca2+ content, as assessed by rapid caffeine application. NCA (45 M) increased force of contraction by 30% in isolated hearts. In conclusion, NCA increased contractile force in normal and -adrenergically desensitized VMs as well as in isolated mouse hearts. This profile warrants further investigations of this HNO donor in the context of heart failure.

AB - Contractile dysfunction and diminished response to -adrenergic agonists are characteristics for failing hearts. Chemically donated nitroxyl (HNO) improves contractility in failing hearts and thus may have therapeutic potential. Yet, there is a need for pharmacologically suitable donors. In this study we tested whether the pure and long acting HNO donor, 1-nitrosocyclohexyl acetate (NCA), affects contractile force in normal and pathological ventricular myocytes (VMs) as well as in isolated hearts. VMs were isolated from mice either subjected to isoprenaline-infusion (ISO; 30 g/g per day) or to vehicle (0.9% NaCl) for 5 days. Sarcomere shortening and Ca2+ transients were simultaneously measured using the IonOptix system. Force of contraction of isolated hearts was measured by a Langendorff-perfusion system. NCA increased peak sarcomere shortening by+40-200% in a concentration-dependent manner (EC50 55 M). Efficacy and potency did not differ between normal and chronic ISO VMs, despite the fact that the latter displayed a markedly diminished inotropic response to acute -adrenergic stimulation with ISO (1 M). NCA (60 M) increased peak sarcomere shortening and Ca2+ transient amplitude by 200% and 120%, respectively, suggesting effects on both myofilament Ca2+ sensitivity and sarcoplasmic reticulum (SR) Ca2+ cycling. Importantly, NCA did not affect diastolic Ca2+ or SR Ca2+ content, as assessed by rapid caffeine application. NCA (45 M) increased force of contraction by 30% in isolated hearts. In conclusion, NCA increased contractile force in normal and -adrenergically desensitized VMs as well as in isolated mouse hearts. This profile warrants further investigations of this HNO donor in the context of heart failure.

KW - Acetates

KW - Animals

KW - Cells, Cultured

KW - Heart Ventricles

KW - Male

KW - Mice

KW - Mice, Inbred C57BL

KW - Muscle Contraction

KW - Myocytes, Cardiac

KW - Nitric Oxide Donors

KW - Nitrogen Oxides

KW - Nitroso Compounds

U2 - 10.1016/j.bbrc.2010.10.030

DO - 10.1016/j.bbrc.2010.10.030

M3 - SCORING: Journal article

C2 - 20946877

VL - 402

SP - 340

EP - 344

JO - BIOCHEM BIOPH RES CO

JF - BIOCHEM BIOPH RES CO

SN - 0006-291X

IS - 2

M1 - 2

ER -