TY - JOUR
T1 - First Clinical Study with AP30663 - a KCa2 Channel Inhibitor in Development for Conversion of Atrial Fibrillation
AU - Gal, Pim
AU - Klaassen, Erica S.
AU - Bergmann, Kirsten R.
AU - Saghari, Mahdi
AU - Burggraaf, Jacobus
AU - Kemme, Michiel J.B.
AU - Sylvest, Christina
AU - Sørensen, Ulrik
AU - Bentzen, Bo H.
AU - Grunnet, Morten
AU - Diness, Jonas G.
AU - Edvardsson, Nils
PY - 2020/11
Y1 - 2020/11
N2 - Pharmacological cardioversion of atrial fibrillation (AF) is frequently inefficacious. AP30663, a small conductance Ca2+ activated K+ (KCa2) channel blocker, prolonged the atrial effective refractory period in preclinical studies and subsequently converted AF into normal sinus rhythm. This first-in-human study evaluated the safety and tolerability, and pharmacokinetic (PK) and pharmacodynamic (PD) effects were explored. Forty-seven healthy male volunteers (23.7 ± 3.0 years) received AP30663 intravenously in ascending doses. Due to infusion site reactions, changes to the formulation and administration were implemented in the latter 24 volunteers. Extractions from a 24-hour continuous electrocardiogram were used to evaluate the PD effect of AP30663. Data were analyzed with a repeated measure analysis of covariance, noncompartmental analysis, and concentration-effect analysis. In total, 33 of 34 adverse events considered related to AP30663 exposure were related to the infusion site, mild in severity, and temporary in nature, although full recovery took up to 110 days. After formulation and administration changes, the local infusion site reaction remained, but the median duration was shorter despite higher dose levels. AP30663 displayed a less than dose proportional increase in peak plasma concentration (Cmax) and a terminal half-life of around 5 hours. In healthy volunteers, no effect of AP30663 was observed on electrocardiographic parameters, other than a concentration-dependent effect on the corrected QT Fridericia’s formula interval (+18.8 ± 4.3 ms for the highest dose level compared with time matched placebo). In conclusion, administration of AP30663, a novel KCa2 channel inhibitor, was safe and well-tolerated systemically in humans, supporting further development in patients with AF undergoing cardioversion.
AB - Pharmacological cardioversion of atrial fibrillation (AF) is frequently inefficacious. AP30663, a small conductance Ca2+ activated K+ (KCa2) channel blocker, prolonged the atrial effective refractory period in preclinical studies and subsequently converted AF into normal sinus rhythm. This first-in-human study evaluated the safety and tolerability, and pharmacokinetic (PK) and pharmacodynamic (PD) effects were explored. Forty-seven healthy male volunteers (23.7 ± 3.0 years) received AP30663 intravenously in ascending doses. Due to infusion site reactions, changes to the formulation and administration were implemented in the latter 24 volunteers. Extractions from a 24-hour continuous electrocardiogram were used to evaluate the PD effect of AP30663. Data were analyzed with a repeated measure analysis of covariance, noncompartmental analysis, and concentration-effect analysis. In total, 33 of 34 adverse events considered related to AP30663 exposure were related to the infusion site, mild in severity, and temporary in nature, although full recovery took up to 110 days. After formulation and administration changes, the local infusion site reaction remained, but the median duration was shorter despite higher dose levels. AP30663 displayed a less than dose proportional increase in peak plasma concentration (Cmax) and a terminal half-life of around 5 hours. In healthy volunteers, no effect of AP30663 was observed on electrocardiographic parameters, other than a concentration-dependent effect on the corrected QT Fridericia’s formula interval (+18.8 ± 4.3 ms for the highest dose level compared with time matched placebo). In conclusion, administration of AP30663, a novel KCa2 channel inhibitor, was safe and well-tolerated systemically in humans, supporting further development in patients with AF undergoing cardioversion.
UR - http://www.scopus.com/inward/record.url?scp=85088564258&partnerID=8YFLogxK
U2 - https://doi.org/10.1111/cts.12835
DO - https://doi.org/10.1111/cts.12835
M3 - Article
C2 - 32725783
SN - 1752-8054
VL - 13
SP - 1336
EP - 1344
JO - Clinical and Translational Science
JF - Clinical and Translational Science
IS - 6
ER -