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Induction of tumor necrosis factor production from monocytes stimulated with mannuronic acid polymers and involvement of lipopolysaccharide-binding protein, CD14, and bactericidal/permeability-increasing factor.

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Well-defined polysaccharides, such as beta1-4-linked D-mannuronic acid (poly[M]) derived from Pseudomonas aeruginosa, induce monocytes to produce tumor necrosis factor (TNF) through a pathway involving membrane CD14. In this study we have investigated the effects of soluble CD14 (sCD14),

Involvement of CD14 and beta2-integrins in activating cells with soluble and particulate lipopolysaccharides and mannuronic acid polymers.

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Lipopolysaccharide (LPS) and related bacterial products can be recognized by host inflammatory cells in a particulate, bacterium-bound form, as well as in various soluble, released forms. In the present study we have compared the mechanisms used by LPS, detoxified LPS (DLPS), and mannuronic acid

Targeting of circulating Th17 cells by β-D-mannuronic acid (M2000) as a novel medication in patients with rheumatoid arthritis.

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OBJECTIVE This study aimed at investigating the inhibitory effect of β-D-mannuronic acid (M2000) on the Th17 circulating levels and IL-17 a related cytokine in rheumatoid arthritis (RA) patients. METHODS The study included 27 patients with RA who had failed response to treatment. All patients were

Similar mechanisms of action of defined polysaccharides and lipopolysaccharides: characterization of binding and tumor necrosis factor alpha induction.

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Little has been reported about the effects of different polysaccharides on cytokine production from human monocytes. In this study, we show that several well-defined polysaccharides, including polymers with different sizes of beta 1-4-linked D-mannuronic acid (poly-M, high-M alginate, and M-blocks)

An in vitro assessment for evaluating the efficiency of β-d-mannuronic acid (M2000) in myelodysplastic syndrome.

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β-d-Mannuronic acid (M2000), a novel non-steroidal anti-inflammatory drug (NSAID) with immunosuppressive properties, has been previously shown to exhibit potential therapeutic effects on autoimmune diseases. Immunosuppression therapy has been a standard approach for myelodysplastic syndrome (MDS)

Involvement of toll-like receptor (TLR) 2 and TLR4 in cell activation by mannuronic acid polymers.

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The alginate capsule produced by the human pathogen Pseudomonas aeruginosa is composed mainly of mannuronic acid polymers (poly-M) that have immunostimulating properties. Poly-M shares with lipopolysaccharide the ability to stimulate cytokine production from human monocytes in a CD14-dependent

Long-term reversal of diabetes by the injection of immunoprotected islets.

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The intraperitoneal injection of insulin-producing islets immunoprotected by an alginate-poly(amino acid) membrane is a potential method of reversing diabetes without the need for lifelong immunosuppression. Previous attempts to demonstrate this technology in large animals have failed, preventing

The involvement of CD14 in stimulation of cytokine production by uronic acid polymers.

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In this study the molecular mechanisms behind the stimulatory activities of the uronic acid polymers poly mannuronic acid (poly M), high M alginate and oxidized cellulose (C60XY) were investigated and compared with lipopolysaccharide (LPS). The cytokine-inducing abilities of the uronic acid polymers

Alginate polylysine microcapsules as immune barrier: permeability of cytokines and immunoglobulins over the capsule membrane.

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Transplantation of pancreatic islets in alginate polylysine microcapsules is a potential useful method for treating type I diabetes. In this study, the permeability for alginate-polylysine microcapsules to cytokines an immunoglobulines has been investigated by a newly developed method. Magnetic

The effect of host factors and capsule composition on the cellular overgrowth on implanted alginate capsules.

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Microencapsulation of islets of Langerhans in alginate/poly-L-lysine (PLL)/alginate capsules may provide a method for transplantation in the absence of immunosuppression. The aim of this study was to investigate the problem of overgrowth on implanted capsules with regard to the composition of the

Microcapsules made by enzymatically tailored alginate.

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Alginate is widely used for encapsulation of cells. Alginate is a linear block copolymer consisting of mannuronic acid (M) and guluronic acid (G). It has been shown that enzymes known as C-5 epimerases convert M to G in the polymer chain, giving rise to novel alginates with tailored properties. One

In vitro and in vivo characterization of nonbiomedical- and biomedical-grade alginates for articular chondrocyte transplantation.

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Alginate is a key hydrogel for cartilage tissue engineering. Here, we systematically evaluated four biomedical- and two nonbiomedical-grade alginates for their capacity to support the in vitro culture and in vivo transplantation of articular chondrocytes. Chondrocytes in all ultrapure alginates

TNF production from peripheral blood mononuclear cells in diabetic patients after stimulation with alginate and lipopolysaccharide.

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Microencapsulated pancreatic Langerhans islets in calcium alginate gels have been used as an implantable bio-artificial pancreas in the treatment of diabetes mellitus, but with limited success due to overgrowth of the capsule with fibroblasts and phagocytes. The authors earlier demonstrated that

Induction of cytokine production from human monocytes stimulated with alginate.

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Alginates are polysaccharides with gel-forming properties composed of 1,4-linked beta-D-mannuronic acid (M), alpha-L-guluronic acid (G), and alternating (MG) blocks. Alginate can be used as a matrix for implanted cells in vivo. In this study, we have examined the ability of alginates and their

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