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ANG-(1-7) improves the function of the remodeling heart. Although this peptide is generated directly within the myocardium, the effects of ANG-(1-7) on cardiac fibroblasts that play a critical role in cardiac remodeling are largely unknown. We tested the hypothesis that specific binding of ANG-(1-7) to cardiac fibroblasts regulates cellular functions that(More)
Intracellular microelectrode techniques were used to examine the effects of mucosal or serosal acidification on intracellular pH (pHi) in gastric surface epithelial cells. Necturus antrum was mounted in a modified Ussing chamber, and pHi was determined from the difference between the potentials recorded by intracellular conventional and pH-sensitive(More)
Angiotensin (Ang) II plays an important role in post-myocardial infarction (MI) cardiac remodeling. The Ang II type 1 (AT(1)) receptor which mediates most Ang II effects is upregulated on non-myocytes in the post-MI heart. We have shown that pro-inflammatory cytokines increase AT(1) receptor density on cardiac fibroblasts through a mechanism involving(More)
By use of microelectrode techniques the electrical resistances of the cell membranes and paracellular pathways of surface epithelium in Necturus antrum were determined under control conditions (Ringer solutions containing 106.6 mM Na+, 91.4 mM Cl-) and during exposure to mucosal solutions containing high Na+ and Cl- concentrations. Resistances were(More)
OBJECTIVE Persistently elevated levels of inflammatory cytokines such as tumor necrosis factor (TNF)alpha after acute myocardial infarction (MI) may contribute to maladaptive ventricular remodeling. The aim of the present study was to examine the effects of immunomodulatory therapy with recombinant soluble TNF receptor (TNFR:Fc) or intravenous(More)
The surface epithelial cells of the gastric mucosa transport Na+ from lumen to serosa. The first step in this process is the entry of Na+ through an amiloride-sensitive Na+ channel at the apical membrane. The exact function(s) of this Na+ transport are unknown, but it has been suggested that it might help the stomach to withstand an acid load. The present(More)
Intracellular microelectrode techniques were employed to examine the effects of luminal aspirin and acetic acid on intracellular pH and cell membrane potential in the surface epithelial cells of Necturus antrum. Antral mucosa was mounted in a modified Ussing chamber, and intracellular pH was determined from the difference between the potentials recorded by(More)
The effects of low doses of luminal ethanol on the amiloride-sensitive apical membrane potential of Necturus antral mucosa were studied using conventional microelectrode techniques. Luminal ethanol (0.250-4.0% vol/vol) caused a dose-dependent hyperpolarization of the apical membrane potential (Vmc), an increase in transepithelial resistance (Rt) and(More)