Effect of pressure overload on cardiac Ca2+ antagonist binding sites of guinea pig. Comparison with the adaptational response of the hypertrophied rat heart.

Abstract:

STUDY OBJECTIVE:The aim was to determine if the adaptational process of the cardiac calcium channel to pressure overload observed in rat heart also occurs in species characterised by a higher sensitivity to external calcium than in the rat. This adaptation occurs via a maintained density of dihydropyridine receptors and calcium current in hypertrophied rat heart. DESIGN:The guinea pig was chosen and the dissociation constant (Kd), association and dissociation rate constants (k+1,k-1), and maximal number (Bmax) of the dihydropyridine receptors were measured through binding of [3H]PN 200-110 to crude sarcolemma fractions from control and hypertrophied guinea pig left ventricle. EXPERIMENTAL MATERIAL:Hypertrophy of the left ventricle was obtained by stenosis of the abdominal aorta in guinea pigs. MEASUREMENTS AND MAIN RESULTS:Hypertrophy reached at least 50% in 15% of the surviving animals. No significant differences in the binding of [3H]PN 200-110 to the dihydropyridine receptor were observed between control and hypertrophied left ventricle microsomal preparations: Kd = 1.59(SEM 0.22) and 1.17(0.36) nM; Bmax = 225(18) and 213(4) fmol.mg-1 of protein; k-1 = 2.30(0.26) and 2.00(0.13) min-1 x 10(-2); k+1 = 3.8(0.7) and 3.5(0.3) nM-1.min-1 x 10(-2) respectively. CONCLUSIONS:In guinea pig as in rat, the total number of dihydropyridine receptors per left ventricle increased proportionately to the hypertrophy. This is consistent with an unchanged density of the cardiac Ca2+ channels in the hypertrophied guinea pig heart as previously shown in hypertrophied rat heart.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Primot I,Mayoux E,Oliviero P,Charlemagne D

doi

10.1093/cvr/25.10.875

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

875-80

issue

10

eissn

0008-6363

issn

1755-3245

journal_volume

25

pub_type

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