Search results for " Smooth Muscle"
showing 10 items of 105 documents
Rapamycin vermindert die Neointimaausbildung nach vaskulärer Schädigung
2003
Background: Proliferation and migration of vascular smooth muscle cells (SMCs) mark the key processes in the development of bypass graft disease and during neointima formation in restenosis after angioplasty. Growth factors are potent SMC mitogens as they are involved in SMC proliferation and in extracellular matrix (ECM) synthesis. Based on these premises, we examined the effect of the proliferation inhibitor rapamycin in human SMC culture and in a rabbit vascular injury model. Materials and methods: Injection of rapamycin or its vehicle was performed with an infusion-balloon catheter directly into the vessel wall during vascular injury. The intima/media ratio was determined histologicall…
Involvement of PKC and NF-κB in Nitric Oxide Induced Apoptosis in Human Coronary Artery Smooth Muscle Cells
2001
Apoptosis of vascular smooth muscle cells is critically involved in progression of atherosclerosis and may prevent intimal hyperplasia in restenosis and vascular remodeling. Nitric oxide (NO) is known to induce apoptosis, but the signaling pathways still remain unclear. We investigated p53 accumulation, protein kinase C (PKC) activation and nuclear transcription factor (NF-kappaB) binding activity as possible signaling mechanisms of NO-induced apoptosis. Apoptosis was induced dose-dependently with the NO-donors sodiumnitroprusside (SNP: 232+/-48%) and SIN-1 (241+/-90% of actinomycin D induced apoptosis; means +/- SEM, *por =0.05 vs. control) in HSMC. Inhibition of PKC significantly attenuat…
Current understanding of somatic stem cells in leiomyoma formation.
2014
Objective To provide a detailed summary of current scientific knowledge of somatic stem cells (SSCs) in murine and human myometrium and their putative implication in leiomyoma formation, as well as to establish new therapeutic options. Design Pubmed and Scholar One manuscripts were used to identify the most relevant studies on SSCs and their implications in human myometrium and leiomyomas. Setting University research laboratory–affiliated infertility clinic. Patient(s) Not applicable. Intervention(s) Not applicable. Main Outcome Measure(s) Not applicable. Result(s) Despite numerous publications on SSCs, it was not until 2007 that scientific evidence based on the use of 5-bromo-2′-deoxyuridi…
Therapeutic targets for overactive bladder other than smooth muscle
2015
For a long time, our concepts of regulation of urinary bladder function in health and disease as well as of the target structures of therapeutics have focused on detrusor smooth muscle cells. However, other structures including urothelium, afferent nerves and bladder blood vessels may also be important in pathophysiology and its treatment.Based on a selective review of literature, we discuss the role of urothelium, afferent nerve fibers and bladder blood vessels in bladder pathophysiology and as targets for treatment.There is solid evidence now that multiple anatomical structures within the urinary bladder contribute to the regulation of its function and hence may be targets for established…
A novel in vitro model for the study of plaque development in atherosclerosis
2006
SummaryFor the study of atherogenesis in vitro, coculture systems have been devised, in which two or more cell types can be cultured in close contact to each other. Herein, we describe a novel in vitro model that aims at the simulation of the morphology ofa normal muscular artery allowing for the study of the initial events in atherosclerosis. Usinga modified fibrin gel as a scaffold for the coculture of endothelial cells (ECs) and smooth muscle cells (SMCs), we generated an autologous in vitro model with a multilayer growth of SMCs (intima-like structure) covered by an endothelium. The production of extracellular matrix (ECM) could be visualized histologically and verified by (i) ascorbic-…
Subendothelial infiltration of neutrophil granulocytes and liberation of matrix-destabilizing enzymes in an experimental model of human neo-intima.
2008
SummaryIt was the objective of this study to examine the role of human neutrophil granulocytes (PMN) in an in-vitro model of human neo-intima developed for the study of atherosclerosis. Human granulocytes were subjected to a co-culture model of human endothelial and smooth muscle cells. Subendothelial lipid accumulation was achieved by addition of native LDL to the culture medium. Tissue samples were analyzed by immunohistochemistry and scanning/transmission electron microscopy, and culture supernatants were examined for the presence of interleukin- 8 (IL-8), MCP-1, GRO-α, elastase and matrixmetalloproteinase-8 (MMP-8). Following addition of 2 mg/ml LDL, adherence, transmigration and infilt…
The Participation of the Complement System in Atherosclerotic Vascular Disease
1991
Atherosclerosis is a vascular disease of large and medium-sized arteries wherein the tunica intima becomes thickened due to lipid accumulation, mostly cholesterol and its esters, smooth muscle cell proliferation, and increased deposition of connective tissue matrix. A major risk factor in the development of this disease is hypercholesterolemia arising from elevated levels of low density lipoproteins (LDL). The earliest recognizable lesion, which may be a precursor to the fibrofatty plaque, is the fatty streak. It is predominantly composed of monocyte-derived macrophage foam cells, i.e. cells ladened with intracellular lipid droplets. Hence, a fundamental aspect of atherogenesis is the insud…
Calcitonin gene-related peptide partly protects cultured smooth muscle cells from apoptosis induced by an oxidative stress via activation of ERK1/2 M…
2003
Abstract Oxidative stress induced by a glucose/glucose oxidase (G/GO) generator system dose-dependently decreased the viability of cultured vascular smooth muscle cells (VSMC) as estimated by MTT assay. Cell death was induced in 40% of cells exposed to 0.2 IU/ml of the free radical generating mixture. Annexin-V labeling, Hoechst staining together with DNA laddering demonstrated that apoptosis was responsible for this cell loss. Pretreatment of the cells with 10−8 M calcitonin gene-related peptide (CGRP) significantly attenuated the damaging effect of the oxidative stress. Indeed, cell viability was estimated to be 80% in CGRP-treated group, instead of 60% in absence of CGRP treatment. This …
Association between reduced bronchodilatory effect of deep inspiration and loss of alveolar attachments.
2005
Abstract Background We have previously shown that the bronchodilatory effect of deep inspiration is attenuated in individuals with COPD. This study was designed to investigate whether the impairment in this effect is associated with loss of alveolar attachments. Methods We measured deep inspiration (DI)-induced bronchodilation in 15 individuals with and without COPD (67 ± 2.2 yrs of age, mean ± SEM) undergoing lobar resection for peripheral pulmonary nodule. Prior to surgery, we measured TLCO and determined the bronchodilatory effect of deep inspiration after constricting the airways with methacholine. The number of destroyed alveolar attachments, as well as airway wall area and airway smoo…
Clinical implications of airway hyper-responsiveness in COPD
2006
COPD represents one of the leading causes of mortality in the general population. This study aimed at evaluating the relationship between airway hyperresponsiveness (AHR) and COPD and its relevance for clinical practice. We performed a MEDLINE search that yielded a total of 1919 articles. Eligible studies were defined as articles that addressed specific aspects of AHR in COPD, such as prevalence, pathogenesis, or prognosis. AHR appears to be present in at least one out of two individuals with COPD. The occurrence of AHR in COPD is influenced by multiple mechanisms, among which impairment of factors that oppose airway narrowing plays an important role. The main determinants of AHR are reduct…