Inotropic effect of increasing concentration of Ca2+ in the fetal rat heart with retinoic acid-induced malformations.

Abstract:

:Cardiac malformations (pulmonary trunk stenosis, ventricular septal defect, and double outlet right ventricle) were induced by the administration of two doses of retinoic acid (RA) to Wistar rats on d 13 of pregnancy. Contractile performance of the isolated perfused rat heart and its inotropic response to Ca2+ (0.6-10.0 mmol.L-1) was studied in 20-d-old fetuses. The body weight of RA-exposed fetuses was significantly lower compared with controls. RA negatively influenced the contractile parameters of the fetal rat heart. The most pronounced effect was, except at a Ca2+ concentration of 2.5 mmol.L-1, observed at developed force at all other concentrations. Simultaneously, the sensitivity to Ca2+, expressed as the Ca2+ concentration at which 30% of maximum was attained, ws significantly lower in RA-exposed hearts. This implies that the malformed heart is more dependent on the extracellular sources of Ca2+.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Ostádalová I,Pexieder T,Ostádal B,Kolár F

doi

10.1203/00006450-199512000-00011

subject

Has Abstract

pub_date

1995-12-01 00:00:00

pages

892-5

issue

6

eissn

0031-3998

issn

1530-0447

journal_volume

38

pub_type

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