The Effects of Beta Amyloid Peptide 1-42 on Isolated Rat Hearts and Ileum Smooth Muscle.
Pharmacology
; 98(5-6): 261-266, 2016.
Article
em En
| MEDLINE
| ID: mdl-27529557
ABSTRACT
Neurotoxic beta amyloid peptides (ßAPs) are involved in the pathogenesis of Alzheimer disease. ßAP1-42 may also play a role in the regulation of cardiovascular functions. Therefore, we investigated the possible effects of ßAP1-42 on isolated rat heart and ileum. The hearts were perfused with modified Krebs-Henseleit solution. Left ventricular developed pressure (LVDP), maximal rate of pressure development of left ventricle (+dP/dtmax), heart rate, coronary flow, monophasic action potential amplitude (MAPamp), MAP duration at 90% repolarization (MAP90) and contractions of ileum were measured. One, 10 and 100 nmol/l doses of ßAP1-42 significantly decreased LVDP, +dP/dtmax and heart rate. The dose of 1 nmol/l did not change coronary flow, but 10 and 100 nmol/l doses significantly reduced it. All doses of ßAP1-42 did not alter MAPamp, but increased MAP90. ßAP1-42 (1, 10, 100, 1,000 nmol/l) also did not influence ileum contractions. We suggest that ßAP1-42 produces negative inotropic and negative chronotropic effects with an increase in MAP duration. Furthermore, ßAP1-42 at high doses decreases coronary flow.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fragmentos de Peptídeos
/
Peptídeos beta-Amiloides
/
Coração
/
Íleo
/
Músculo Liso
Limite:
Animals
Idioma:
En
Revista:
Pharmacology
Ano de publicação:
2016
Tipo de documento:
Article