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Postnatal developmental changes in the sensitivity of L-type Ca2+ channel to inhibition by verapamil in a mouse heart model
- Source :
- Pediatric Research. 83:1207-1217
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- BackgroundIn the clinical setting, verapamil is contraindicated in neonates and infants, because of the perceived risk of hypotension or bradyarrhythmia. However, it remains unclear whether there is an age-dependent difference in the sensitivity of cardiac L-type Ca2+ channel current (ICa,L) to inhibition by verapamil.MethodsVentricular myocytes were enzymatically dissociated from the hearts of six different age groups (0, 7, 14, 21, 28 days, and 10-15 weeks) of mice, using a similar Langendorff-perfusion method. Whole-cell patch-clamp technique was applied to examine the sensitivity of ICa,L to inhibition, by three classes of structurally different L-type Ca2+ channel antagonists.ResultsVerapamil, nifedipine, and diltiazem concentration-dependently blocked the ventricular ICa,L in all six age groups. However, although nifedipine and diltiazem blocked ventricular ICa,L with a similar potency in all age groups, verapamil more potently blocked ventricular ICa,L in day 0, day 7, day 14, and day 21 mice, than in day 28, and 10-15-week mice.ConclusionIn a mouse heart model, ventricular ICa,L before the weaning age (~21 days of age) exhibited a higher sensitivity to inhibition by verapamil than that after the weaning age, which may explain one possible mechanism associated with the development of verapamil-induced hypotension in human neonates and infants.
- Subjects :
- 0301 basic medicine
medicine.medical_specialty
Voltage-dependent calcium channel
business.industry
03 medical and health sciences
Dose–response relationship
030104 developmental biology
Endocrinology
Nifedipine
Internal medicine
Pediatrics, Perinatology and Child Health
cardiovascular system
Medicine
Weaning
Verapamil
Myocyte
Diltiazem
business
Perfusion
medicine.drug
Subjects
Details
- ISSN :
- 15300447 and 00313998
- Volume :
- 83
- Database :
- OpenAIRE
- Journal :
- Pediatric Research
- Accession number :
- edsair.doi...........b75b51ac06ad4ca03db18ac497064ac8