Myocardial beta adrenoceptor and voltage sensitive calcium channel changes in a canine model of chronic heart failure
Effects of chronic heart failure upon receptor binding and cardiac function were studied in mongrel dogs. Heart failure was induced by three to seven, graded, sequential, intracoronary microembolizations performed 1 to 3 weeks apart. Depressed systolic and diastolic left ventricular function, reduce...
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Veröffentlicht in: | Journal of molecular and cellular cardiology 1992-11, Vol.24 (11), p.1361-1369 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Effects of chronic heart failure upon receptor binding and cardiac function were studied in mongrel dogs. Heart failure was induced by three to seven, graded, sequential, intracoronary microembolizations performed 1 to 3 weeks apart. Depressed systolic and diastolic left ventricular function, reduced cardiac output, increased systemic vascular resistance, increased plasma norepinephrine concentration, left ventricular hypertrophy, and dilation were associated with the development of heart failure in this model. Three months after the last embolization, the density and affinity of myocardial beta adrenoceptors and voltage sensitive calcium channels were quantified by analyzing saturation isotherms of specific radioligand binding. [
3H]Dihydroalprenolol and [
3H]nitrendipine bound specifically and with high affinity to cardiac beta adrenoceptors and calcium channels, respectively. Scatchard transformation of the specific binding of these radioligands in membranes prepared following intracoronary embolization demonstrated a 47% decrease in the density of [
3H]dihydroalprenolol binding sites (605 ± 20 fmol/mg, normal,
vs. 323 ± 18 fmol/mg, failed;
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ISSN: | 0022-2828 1095-8584 |
DOI: | 10.1016/0022-2828(92)93100-X |