Willmann Liang

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A rat model of ovariectomy-induced voiding dysfunction was established and the effects of ovariectomy and subsequent estrogen replacement on the affinity of muscarinic receptors in the rat bladder were determined. Voiding frequency and spatial distribution patterns were documented in sham-operated (control), and ovariectomized (placebo- or estrogen-treated)(More)
The roles played by K(+) channels in the urothelium (UE) and detrusor smooth muscle (DSM) in regulating agonist-induced bladder contraction is not known at present. Thus, the effects in carbachol (CCh)-induced contraction in UE-intact (+UE) and UE-denuded (-UE) rat detrusor strips pretreated with K(+)-channel blockers were investigated here. The(More)
In this study, we identified ryanodine receptors (RyRs) as a component of a cytosolic Ca(2+) removal pathway in freshly isolated rabbit aortic endothelial cells. In an earlier article, we reported that the sarco(endo)plasmic reticulum Ca(2+)-ATPase (SERCA) and Na(+)/Ca(2+) exchanger (NCX) function in series to extrude cytosolic Ca(2+) to the extracellular(More)
Endothelial dysfunction often precedes Type 2 diabetes-associated cardiovascular complications. One important cause of endothelial dysfunction is oxidative stress, which can lead to reduced nitric oxide (NO) bioavailability. In this study, we examined the effects of ramipril (an angiotensin-converting enzyme inhibitor, ACEI) on reactive oxygen species (ROS)(More)
Valvular myofibroblasts (VMFs) are present in large numbers in the cardiac valve. Although the functional roles of VMFs in vivo remain to be determined, evidence suggests the cells' ability to contract in vitro. Since Ca2+ is important in the contractility of many cell types, we examined Ca2+ responses induced by different agonists in normal and rheumatic(More)
Valvular myofibroblasts (VMFs), being the most predominant cells in the cardiac valve, perform a variety of functions to maintain normal valvular physiology. These functions, such as contraction, proliferation, and wound repair, are all directly or indirectly mediated by intracellular Ca(2+) concentrations ([Ca (2+)](i)). Knowing how [Ca(2+)](i) is(More)
In this study, we examined histamine-induced calcium signaling in cultured human valvular myofibroblasts (hVMFs), which are the most prominent interstitial cells in cardiac valves mediating valvular contraction, extracellular matrix secretion, and wound repair. Despite the functional importance of VMFs in cardiac valves, the cellular-signaling pathways,(More)
This teaching article uses the report by Kwan et al., "Effects of methacholine, thapsigargin, and La(3+) on plasmalemmal and intracellular Ca(2+) transport in lacrimal acinar cells," where the effects of Ca(2+)-mobilizing agents in regulating Ca(2+) fluxes were examined under various conditions. Upper-level undergraduate and new graduate students in(More)
This teaching paper utilizes the materials presented by Dr. Fabiato in his review article entitled "Calcium-induced release of calcium from the cardiac sarcoplasmic reticulum." In the review, supporting evidence of calcium-induced calcium release (CICR) is presented. Data concerning potential objections to the CICR theory are discussed as well. In closing,(More)
Liang W. Teaching calcium-induced calcium release in cardiomyocytes using a classic paper by Fabiato. Adv Physiol Educ 32: 1–10, 2008; doi:10.1152/advan.00090.2007.—This teaching paper utilizes the materials presented by Dr. Fabiato in his review article entitled “Calcium-induced release of calcium from the cardiac sarcoplasmic reticulum.” In the review,(More)
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