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At least 343 records · Page 19Linked to original sources

PubMed2005

Morphological, electrophysiological and coupling characteristics of bone marrow-derived mononuclear cells-an in vitro-model.

OBJECTIVE: Transplantation of bone marrow-derived mononuclear cells (BMC) may be suitable to prevent myocardial remodeling and improve left ventricular function after myocardial infarction. However, it is unknown whether or not cardiomyocytes and BMCs can form functioning cell-to-cell coupling and develop adequate electrophysiological properties. METHODS: BMCs were isolated from minipig leg bones, treated with 5-azacytidine (10 microM) for 24 h, cultured for 7 days and labeled with a fluoroscopic dye (DIL). BMCs were cocultured with spontaneously beating cardiomyocytes of neonatal rats. On days 4, 7 and 14 cocultured cells were analyzed. Immunhistochemistry (Connexin 43, alpha-actinin) was used to assess cardiomyogenic differentiation. Action potential characteristics were recorded in whole cell patch clamp mode and to investigate intercellular communication a second gap junction permeable fluoroscopic dye was brought into BMCs by microinjection (Lucifer yellow, LY). RESULTS: From day 7 in coculture BMCs beated synchronously with neonatal rat cardiomyocytes. On day 14, 55.9% of BMCs expressed alpha-actinin and 98.3% were positive for gap junction protein connexin 43. BMC action potential duration (APD90) was mean 11.1 ms with dV/dt(max) of 26.8 V/s and similar to atrial cardiac type. However, microinjection of LY revealed only little dye transfer into adjacent rat cardiomyocytes. CONCLUSIONS: Cocultured BMCs have the potential for early expression of muscle specific proteins in about 60% after 14 days and for cardiac gap junction proteins. Synchronous beating indicates an effective electromechanical coupling. In this heterologous setting we could prove only weak metabolic coupling.

Actinin↗

PubMed2005

Living patches engineered from human umbilical cord derived fibroblasts and endothelial progenitor cells.

OBJECTIVE: A major shortcoming in contemporary congenital heart surgery is the lack of viable replacement materials with the capacity of growth and regeneration. Here we focused on living autologous patches engineered from human umbilical cord derived fibroblasts and endothelial progenitor cells (EPCs) as a ready-to-use cell source for paediatric cardiovascular tissue engineering. METHODS: EPCs were isolated from 20 ml fresh umbilical cord blood by density gradient centrifugation and myofibroblasts were harvested from umbilical cord tissue. Cells were differentiated and expanded in vitro using nutrient media containing growth factors. Before seeding, cell-phenotypes were assessed by immuno-histochemistry. Biodegradable patches fabricated from synthetic polymers (PGA/P4HB) were seeded with myofibroblasts followed by endothelialization with EPCs. All patches were cultured in a perfusion bioreactor. A subgroup of patches was additionally stimulated by cyclic strain. Analysis of the neo-tissues comprised histology, immuno-histochemistry, extracellular matrix (ECM) analysis and biomechanical testing. RESULTS: Endothelial phenotypes of EPCs before seeding were confirmed by Ac-Dil-LDL, CD 31, von-Willebrand-Factor and eNOS staining. Histology of the seeded patches demonstrated layered viable tissue formation in all samples. The cells in the newly formed tissues expressed myofibroblast markers, such as desmin and alpha-SMA. The EPCs derived neo-endothelia showed constant endothelial phenotypes (CD 31, vWF). major constituents of ECM such as collagen and proteoglycans were biochemically detected. Stress-strain properties of the patches showed features of native-analogous tissues. CONCLUSIONS: Living tissue engineered patches can be successfully generated from human umbilical cord derived myofibroblasts and EPCs. This new cell source may enable the tissue engineering of versatile, living, autologous replacement materials for congenital cardiac interventions.

Biocompatible Materials↗

PubMed2004

Transplantation of corneas reconstructed with cultured adult human corneal endothelial cells in nude rats.

PURPOSE: The feasibility of corneal reconstruction with cultured adult human corneal endothelial cells (HCEC) was examined in a nude rat model. METHODS: Endothelial cells were removed from the corneas of Lewis rats using a sterile cotton swab. Cultured adult HCEC labelled with a fluorescent marker chloromethyl-benzamidodialkylcarbocyanine (CM-Dil) were seeded onto the denuded Descemet's membrane. Then the corneas were centrifuged, incubated for 2 days, and transplanted into the eyes of nude rats using the penetrating keratoplasty technique (HCEC group). Control nude received corneas denuded of endothelium and without HCEC. The operated eyes were observed for 28 days after transplantation, and then were subjected to histological and fluorescein microscopic examination. RESULTS: The mean corneal thickness was significantly smaller in the HCEC group than in the control group throughout the observation period. The corneal endothelial cell density of the grafts at 28 days postoperatively ranged from 2425 to 3250 cells mm(-2) (mean+/-sd, 2744+/-337 cells mm(-2)). Fluorescein microscopy at 28 days after surgery showed numerous DiI-labelled cells on the posterior corneal surface in the HCEC group. Frozen sections showed a monolayer of DiI-labelled cells on Descemet's membrane. CONCLUSIONS: Cultured adult HCEC function well and maintain corneal transparency for 1 month after transplantation in nude rats.

Adult↗

PubMed2004

Protective effect of diltiazem on cyanide-induced neurotoxicity in Wistar strain rats.

Cyanide is a well-established poison known for its rapid lethal action and toxicity. The central nervous system is one of the main target sites for cyanide toxicity. Cyanide not only alters brain biogenic amine levels but also the intracellular calcium levels in the neuronal cells. In the present study the role of calcium channel blocker diltiazem (DIL) in cyanide induced biogenic amine changes was evaluated in the Wistar strain rats. The protective effect of diltiazem pretreatment and diltiazem treatment along with cyanide on the dopaminergic system and the serotonergic system in the corpus striatum were studied. Diltiazem pretreatment was found to prevent cyanide induced changes in both the amines in the corpus striatum. These results suggest that diltiazem may mitigate the harmful effects of cyanide by interfering with influx of calcium ions and release of the biogenic amines.

Animals↗

PubMed2004

Source apportionment of trace metals in surface waters of a polluted stream using multivariate statistical analyses.

Surface water samples were collected from ten previously selected sites of the polluted Dil Deresi stream, during two field surveys, December 2001 and April 2002. All samples were analyzed using ICP-AES, and the concentrations of trace metals (Al, As, Ba, Cd, Co, Cr, Cu, Fe, Pb, Sn and Zn) were determined. The results were compared with national and international water quality guidelines, as well as literature values reported for similar rivers. Factor analysis (FA) and a factor analysis-multiple regression (FA-MR) model were used for source apportionment and estimation of contributions from identified sources to the concentration of each parameter. By a varimax rotated factor analysis, four source types were identified as the paint industry; sewage, crustal and road traffic runoff for trace metals, explaining about 83% of the total variance. FA-MR results showed that predicted concentrations were calculated with uncertainties lower than 15%.

Environmental Monitoring↗

PubMed2006

The distribution and sources of heavy metals in Izmit Bay surface sediments affected by a polluted stream.

Dil Deresi stream is a highly contaminated stream passing through the most heavily industrialized area of Izmit Bay. In this research, surface sediments in the <63-microm fraction collected from 34 sites at western part of Izmit Bay, Northeastern Marmara Sea, Turkey were analyzed by ICP-AES for Al, As, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, Pb, Sn and Zn. Metal concentrations were compared with the marine sediment quality standards (SQS) and literature data to assess the pollution status of the sediments. Enrichment factors (EFs) were calculated to assess whether the concentrations observed represent background or contaminated levels. The analysis revealed three groups of elements: (1) Sn is the most enriched element; (2) As, Cd, Pb and Zn are minor enriched elements; and (3) Co, Cr, Cu, Fe, Mg, Mn and Ni are at background concentrations. The distribution maps of the concentrations and enrichment factors for all heavy metals were also produced as a contour plot based on Geographic Information System (GIS) technology.

Environmental Monitoring↗

PubMed2005

Exacerbation of rheumatoid arthritis following Helicobacter pylori eradication: disruption of established oral tolerance against heat shock protein?

A 62-year-old Japanese woman with RA received an eradication therapy against Helicobacter pylori in November 1999. Eight weeks later, successful eradication was confirmed by negative results for rapid urease test, pathologic findings, and a fall in anti-H. pylori IgG antibody titer. During the course, parameters for RA activity were exacerbated: C-reactive protein 1.1-4.2 mg/dL, rheumatoid arthritis precipitation antigen 2560-5120 dils., erythrocyte sedimentation rate 52-123 mm/h, and complements CH50 50 to over 60 U/mL. Lansbury index increased from 70% to 105%. Two more weeks later, the patient noticed right shoulder pain. She also complained of bilateral gonalgia two months later, and physical examination revealed increased fluid in the knee joints. Prednisolone was required to control the disease activity. The results of this case suggested that RA patients might experience a deleterious effect on the disease activity following H. pylori eradication possibly through disruption of the established oral tolerance against stress protein such as mycobacterial heat shock protein 65.

Administration, Oral↗

PubMed2006

Hypoxia-induced mitogenic factor enhances angiogenesis by promoting proliferation and migration of endothelial cells.

Our previous studies have indicated that hypoxia-induced mitogenic factor (HIMF) has angiogenic properties in an in vivo matrigel plug model and HIMF upregulates expression of vascular endothelial growth factor (VEGF) in mouse lungs and cultured lung epithelial cells. However, whether HIMF exerts angiogenic effects through modulating endothelial cell function remains unknown. In this study, mouse aortic rings cultured with recombinant HIMF protein resulted in enhanced vascular sprouting and increased endothelial cell spreading as confirmed by Dil-Ac-LDL uptake, von Willebrand factor and CD31 staining. In cultured mouse endothelial cell line SVEC 4-10, HIMF dose-dependently enhanced cell proliferation, in vitro migration and tubulogenesis, which was not attenuated by SU1498, a VEGFR2/Flk-1 receptor tyrosine kinase inhibitor. Moreover, HIMF stimulation resulted in phosphorylation of Akt, p38 and ERK1/2 kinases in SVEC 4-10 cells. Treatment of mouse aortic rings and SVEC 4-10 cells with LY294002, but not SB203580, PD098059 or U0126, abolished HIMF-induced vascular sprouting and angiogenic responses. In addition, transfection of a dominant-negative mutant of phosphatidylinositol 3-kinase (PI-3K), Deltap85, blocked HIMF-induced phosphorylation of Akt, endothelial activation and tubulogenesis. These results indicate that HIMF enhances angiogenesis by promoting proliferation and migration of endothelial cells via activation of the PI-3K/Akt pathways.

Animals↗

PubMed2005

Use of recombinant adeno-associated viral vectors as a tool for labeling bone marrow cells.

We have tested the feasibility of using recombinant adeno-associated virus (rAAV) vectors as a tool for labeling bone marrow (BM) cells in vivo. We infected BM cells of donor FVB mice with rAAV vectors containing the lacZ gene for 2 h. We then injected the rAAV-infected cells to lethally irradiated-recipient FVB mice. Peripheral blood (PB), BM and spleen harvested at 4 weeks after BM transplant (BMT) demonstrated stable engraftment in beta-galactosidase (beta-gal) expression. In contrast, Dil-labeling displayed only a faint signal 4 weeks after BMT. To analyze the kinetics of BM cells, we injected vascular endothelial growth factor (VEGF), which promotes mobilization of BM cells. Administration of VEGF protein significantly increased the rAAV-mediated beta-gal expression in PB and BM of recipient mice. Moreover, when myocardial infarction was induced in BMT mice, the ischemic area exhibited significant beta-gal staining in rAAV-labeled BMT group. rAAV vectors programmed stable transduction in BM cells in vivo through rapid infection. rAAV appears to represent a useful vector for labeling BM cells ex vivo prior to BMT for analysis of cardiovascular therapeutic purposes.

Animals↗

PubMed1998

Intraocular inflammation and the diffuse infiltrative lymphocytosis syndrome.

PURPOSE: To report a case of bilateral panuveitis associated with diffuse infiltrative lymphocytosis syndrome (DILS). METHODS: Case report. A 35-year-old woman with known human immunodeficiency virus (HIV) infection developed bilateral uveitis with retinal periphlebitis in association with diffuse infiltrative lymphocytosis syndrome. RESULTS: Detailed comprehensive examination and investigations were performed and recognized causes of panuveitis excluded. CONCLUSION: To the best of our knowledge, we report the first case of retinal findings associated with diffuse infiltrative lymphocytosis syndrome.

Adult↗

PubMed1981

Measurement of rotational motion in membranes using fluorescence recovery after photobleaching.

A method has been developed for the measurement of the rotational motion of membrane components. In this method fluorescent molecules whose transition dipole moments lie in a given direction are preferentially destroyed with a short intense burst of polarized laser radiation. The fluorescence intensity, excited with a low intensity observation beam of polarized laser radiation, changes with time as the remaining fluorescent molecules rotate. The feasibility of the method has been demonstrated in a study of the rotation of the fluorescent lipid probe, dil ([bis,-2-(N-octadecyl-3,3-dimethyl-1-benzo[b]pyrrole]-trimethincyanine iodide) incorporated into membranes composed of distearoylphosphatidylcholine (DSPC) or dipalmitoylphosphatidylcholine (DPPC) and 0.20 mol% cholesterol, below the main chain-melting transition temperatures of the phosphatidylcholines. Rotation times in the 0.6-800 s range were observed. The fluorescence recovery (or decay) curves are in satisfactory agreement with theoretical calculations.

Cholesterol↗

PubMed1994

Automated detection and tracking of individual and clustered cell surface low density lipoprotein receptor molecules.

We have developed a technique to detect, recognize, and track each individual low density lipoprotein receptor (LDL-R) molecule and small receptor clusters on the surface of human skin fibroblasts. Molecular recognition and high precision (30 nm) simultaneous automatic tracking of all of the individual receptors in the cell surface population utilize quantitative time-lapse low light level digital video fluorescence microscopy analyzed by purpose-designed algorithms executed on an image processing work station. The LDL-Rs are labeled with the biologically active, fluorescent LDL derivative dil-LDL. Individual LDL-Rs and unresolved small clusters are identified by measuring the fluorescence power radiated by the sub-resolution fluorescent spots in the image; identification of single particles is ascertained by four independent techniques. An automated tracking routine was developed to track simultaneously, and without user intervention, a multitude of fluorescent particles through a sequence of hundreds of time-lapse image frames. The limitations on tracking precision were found to depend on the signal-to-noise ratio of the tracked particle image and mechanical drift of the microscope system. We describe the methods involved in (i) time-lapse acquisition of the low-light level images, (ii) simultaneous automated tracking of the fluorescent diffraction limited punctate images, (iii) localizing particles with high precision and limitations, and (iv) detecting and identifying single and clustered LDL-Rs. These methods are generally applicable and provide a powerful tool to visualize and measure dynamics and interactions of individual integral membrane proteins on living cell surfaces.

Algorithms↗

PubMed1996

Electrofusion between heterogeneous-sized mammalian cells in a pellet: potential applications in drug delivery and hybridoma formation.

High-efficiency electrofusion between cells of different sizes was achieved by application of fusing electric pulses to cells in centrifuged pellets. Larger target cells (Chinese hamster ovary or L1210 cells) were stacked among smaller human erythrocytes or erythrocyte ghosts by sequential centrifugation at 700 g to form five-tier pellets in a specially designed centrifugation-electrofusion chamber. The membranes of erythrocytes and ghost were labeled with fluorescent membrane dye (1,1' dioctadecyl-3,3,3'3'-tetramethylindocarbocyanine (Dil)), and the contents of ghosts were loaded with water-soluble fluorescent dye (42-kDa fluorescein isothiocyanate dextran (FITC-dextran)), to monitor heterogeneous cell fusion. Fusion efficiency was assayed by the extent of either membrane dye mixing or contents (FITC-dextran) mixing with target cells. Four rectangular electric pulses at 300 V and 80 microseconds each were found to give the optimal fusion results of approximately 80% heterogeneous fusion by the content-mixing assay and approximately 95% by the membrane-dye-mixing assay. Cell viability remained greater than 80% after electrofusion. Because of the electric breakdown of cell membranes at the beginning of the pulse, the pellet resistance and hence the partial voltage across the pellet reduced rapidly during the remaining pulse time. This voltage redistribution favored the survival of fused cells. The limited colloidal-osmotic swelling of cells in pellets enhanced cell-cell contact and increased the pellet resistance after each pulse. As a result, the partial voltage across the pellet was restored when the next pulse was applied. This redistribution of pulse voltage in the pellet system permitted the breakdown of cell membranes at a lower applied voltage threshold than that required for electrofusion of cells in suspension or in dielectrophoretic cell chains. The cell viability and soluble dye retention within cells (FITC-dextran) remained at the same high levels for 3 h when the cells were incubated in respective culture media with serum at 37 degrees C. Viability and dye retention decreased significantly within 30 min when cells were incubated in phosphate-buffered saline without serum. The pellet technique was applied to form hybridomas by fusion of larger SP2/0 murine myelomas with smaller naive mouse lymphocytes. An optimum of 173 +/- 70 hypoxanthine aminopterin thymidine (HAT)-selected clones of the hybridomas was obtained from 40,000 SP2/0 cells and 1.5 x 10(6) lymphocytes used in each trial. This high-efficiency fusion technique may be adapted to mediate drug and gene transfer to target cells ex vivo as well as to form hybrid cells with limited cell sources.

Animals↗

PubMed1996

Fluorescence resonance energy transfer analysis of lipopolysaccharide in detergent micelles.

Bacterial endotoxins or lipopolysaccharides (LPS), cell wall components of gram-negative bacteria, are involved in septic shock. LPS consists of a lipid A tail attached to core and O-antigen polysaccharides, but little is known about the supramolecular structure of LPS in blood. We have developed an approach to locate donor and acceptor probes in sulfobetaine palmitate detergent micelles using steady-state and time-resolved fluorescence resonance energy transfer. C18-fluorescein and several LPS species of varying molecular weight labeled with fluorescein isothiocyanate (FITC-LPS) were the donor probes. Acceptor probes were 1,1-dilinoleyl-3,3,3',3'-tetramethyl indocarbocyanine perchlorate (Fast C18-Dil, Ro approximately 68 A), and octadecyl B rhodamine chloride (C18-Rhd, Ro approximately 58 A). With either acceptor, the transfer was of similar high efficiency when FITC-LPS Salmonella minnesota Re 595 (2,500 mol wt, lacking both core and O-antigen) or C18-fluorescein were the fluorescent donor probes. Thus, the donor FITC-LPS with short polysaccharide chain S. minnesota Re 595 and the control donor C18-fluorescein appear to be close to the micelle surface. The transfer efficiency decreased as the molecular weight of the LPS increased. Separation distances between the longest FITC-LPS, S. minnesota (20,000 mol wt, with a long O-antigen), and the micelle were estimated to be 1.5 Ro or more (approximately 100 A), consistent with an extended conformation for the longer O-antigen polysaccharide chain in the detergent.

Animals↗

PubMed2003

Temporal patterns of bone marrow cell differentiation following transplantation in doxorubicin-induced cardiomyopathy.

OBJECTIVE: Recent studies have suggested benefits of bone marrow cell transplantation for the regeneration of ischemic cardiac tissue. To extend the potential of cell transplantation, we assessed this treatment in a mouse model of acute nonischemic doxorubicin-induced cardiomyopathy. METHODS: To allow detection of engrafted cells, we used transgenic mice expressing the nuclear-located LacZ under the control of either desmin or vimentin promoters, which identify muscle lineage and mesenchymal cells, respectively. All transplanted cells were also labeled with the fluorescent dye DIL. One week after the administration of doxorubicin (15 mg/kg), mice were intramyocardially injected with either allogeneic unpurified bone marrow cells (6 x 10(6) in 30 microl, n=59) or purified sca-1(pos) cells (4 x 10(5) in 30 microl, n=22). In parallel, control normal mice received only unpurified bone marrow cells (n=28). Hearts were harvested at serial intervals until 2 weeks after transplantation and analyzed by immunohistochemistry to assess the degree of engraftment and transplanted cell differentiation. RESULTS: In control mice, no differentiation of bone marrow cells was detected. In contrast, unpurified bone marrow cells grafted into diseased myocardium featured two successive phases of cell differentiation. The first yielded cells with a mesenchymal phenotype (44.1+/-10.1 cells/3 x 10(-2) mm(3) at 2 days), was transient and lasted 1 week. The second phase was characterized by cells with a muscular phenotype detected in a small number of cells (5.6+/-2.3 cells/3 x 10(-2) mm(3) at 7 days). Two weeks after transplantation, some of these cells appeared phenotypically close to cardiomyocytes, as evidenced by morphology and positive staining for myosin binding protein C, vinculin and myosin heavy chain. In sca-1(pos) hematopoietic progenitor grafted mice hearts, no transdifferentiation into cardiac cells was detected at any time point. CONCLUSION: These data support the hypothesis of the potential for a myogenic differentiation of bone marrow cells following engraftment in a nonischemic model of global cardiomyopathy. Bone marrow-derived cells amenable to cardiac differentiation are present in total unpurified bone marrow but not in the sca-1(pos) hematopoietic progenitor cell population. However, the very small number of transdifferentiated cells raises concerns over their functional efficacy.

Animals↗

PubMed1998

The ontogeny of innervation of the human pylorus.

PURPOSE: The aim of this study was to document the vagal innervation and expression of neuropeptides, neuronal nitric oxide synthase (nNOS), and neural cell adhesion molecule (NCAM) in the neuromuscular system of the developing human pylorus. METHODS: Specimens of human pylorus (n = 54; age range, 8 weeks' gestation to 6 months postnatal) were studied. Vagal innervation was determined by Dil autofluorescence. A wide range of neuropeptides, NCAM, and the neural isoform of NOS were examined by immunohistochemistry. RESULTS: Vagal innervation was first recognized in the myenteric plexus in the 12-week-old fetus as was vasoactive intestinal polypeptide (VIP) expression. Neuropeptides were present from 8 weeks' gestation and appeared to be expressed progressively from the adventitia toward the mucosa and showed an adultlike profile by 23 weeks' gestation. A craniocaudal pattern of expression was noted for VIP and nNOS. Alpha smooth muscle actin was expressed by muscle fibers of the muscularis propria from 8 weeks and the muscularis mucosae by 14 weeks. All the isoforms of NCAM examined were expressed from 8 weeks in the muscularis propria and by 12 weeks in the submucosa. CONCLUSION: The expression of the antigens studied correlated with the gestational age and development of the pylorus.

Embryonic and Fetal Development↗

PubMed1999

Impact of different low-density lipoprotein (LDL) receptor mutations on the ability of LDL to support lymphocyte proliferation.

Based on the demand for cholesterol for membrane formation, we determined the ability of low-density lipoprotein (LDL) to support proliferation in lymphocytes bearing different LDL receptor mutations, which were treated "in vitro" with lovastatin to inhibit endogenous cholesterol synthesis. Peripheral lymphocytes were isolated from two patients with homozygous familial hypercholesterolemia (FH), one homozygote for the mutation N804K (FH(Colmenar)) in exon 17, herein described for the first time, and a compound heterozygote carrying the mutations D280G and G528V, which determine a transport-defective biochemical phenotype. Flow cytometric analysis with 1,1'-dioctadecyl-3,3,3,3'-tetramethylindocarbocyanineperchlorate (Dil)-LDL showed normal LDL binding but defective internalization in lymphocytes from case 1, whereas in lymphocytes from case 2 both LDL binding and internalization were affected. Studies with mitogen-stimulated lymphocytes demonstrated that despite the different phenotype, the ability of LDL to support proliferation was impaired in both cases to a similar extent. These results indicate that internalization of the LDL particle is required for expression of the mitogenic effect of LDL.

Adolescent↗

PubMed2006

[Muscular complications of human immunodeficiency virus (HIV) infection in the era of effective anti-retroviral therapy].

Introduction of highly active antiretroviral therapy (HAART) has dramatically modified the natural history of HIV disease, but lengthening the survival of HIV-infected individuals has been associated with an increasing prevalence of iatrogenic conditions. Muscular complications of HIV infection are classified as follows: (1) HIV-associated myopathies and related conditions including polymyositis, inclusion-body myositis, nemaline myopathy, diffuse infiltrative lymphocytosis syndrome (DILS), HIV-wasting syndrome, vasculitis, myasthenic syndromes, and chronic fatigue; (2) iatrogenic conditions including mitochondrial myopathies, HIV-associated lipodystrophy syndrome, and immune restoration syndrome; (3) opportunistic infections and tumor infiltrations of skeletal muscle; and (4) rhabdomyolysis. These features are described in the present review.

AIDS-Related Opportunistic Infections↗