Sabina Frascarelli

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Thyroxine (T(4)) is the predominant form of thyroid hormone (TH). Hyperthyroidism, a condition associated with excess TH, is characterized by increases in metabolic rate, core body temperature and cardiac performance. In target tissues, T(4) is enzymatically deiodinated to 3,5,3'-triiodothyronine (T(3)), a high-affinity ligand for the nuclear TH receptors(More)
Receptors for growth hormone secretagogues have been identified in cardiac tissue, but their functional role is unknown. We have investigated the effect of different growth hormone secretagogues on contractile performance and on the susceptibility to ischemic injury, in isolated working rat hearts. In particular, we tested the endogenous secretagogue(More)
3-iodothyronamine (T1AM) is a novel relative of thyroid hormone, able to interact with specific G protein-coupled receptors, known as trace amine-associated receptors. Significant functional effects are produced by exogenous T1AM, including a negative inotropic and chronotropic effect in cardiac preparations. This work was aimed at estimating endogenous(More)
This work was aimed at determining the cardioprotective effect of digitalis glycosides in rat heart, and to relate it with Na, K-ATPase inhibition and ERK1/2 activation. Isolated working rat hearts were perfused in the presence of ouabain or digoxin, which were used at concentrations ranging from 10 to 10 M. The hearts were then subjected to 30 minutes of(More)
3-iodothyronamine (T1AM) is an endogenous compound which shares structural and functional features with biogenic amines and is able to interact with a specific class of receptors, designed as trace amine associated receptors. T1AM has significant physiological effects in mammals and produces a reversible, dose-dependent negative inotropic and chronotropic(More)
3-Iodothyronamine T1AM is a novel endogenous thyroid hormone derivative that activates the G protein-coupled receptor known as trace anime-associated receptor 1 (TAAR1). In the isolated working rat heart and in rat cardiomyocytes, T1AM produced a reversible, dose-dependent negative inotropic effect (e.g., 27+/-5, 51+/-3, and 65+/-2% decrease in cardiac(More)
We investigated whether acute and chronic administration of zofenopril, an angiotensin converting enzyme inhibitor, may modulate the expression of genes which are involved in the pathophysiology of myocardial ischemia and heart failure. We used an acute and a chronic model. In the former isolated rat hearts were perfused for 120 min in the presence or in(More)
Trace amine-associated receptors, a novel class of G-protein coupled receptors which respond to trace amines but not to classical biogenic amines, have been found to be expressed in heart. Therefore, we investigated the cardiac effects of the trace amines p-tyramine, beta-phenylethylamine, octopamine, and tryptamine. Isolated rat hearts were perfused in the(More)
3-iodothyronamine (T(1)AM) is a novel endogenous relative of thyroid hormone, able to interact with trace amine-associated receptors, a class of plasma membrane G protein-coupled receptors, and to produce a negative inotropic and chronotropic effect. In the isolated rat heart 20-25 microM T(1)AM decreased cardiac contractility, but oxygen consumption and(More)
Ghrelin, the natural ligand of the GH secretagogue (GHS) receptor, was originally isolated from the stomach and detected in several tissues, but a systematic study of its tissue distribution has not been performed. In the present investigation, we evaluated ghrelin gene expression (by RT-PCR technique) and ghrelin protein concentration (by enzyme(More)