Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P15088 (mast cell)
 14,925 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Rat peritoneal mast cells were separated by using density gradients of PVP-coated silica particles (Percoll). Mast cells were either isolated on preformed Percoll gradients or cell separation was made simultaneously with the gradient formation. Both procedures resulted in mast cell suspensions of 95 to 99 per cent purity. As tested by Ruthenium red staining and electron microscopy, the isolated mast cells showed a very good preservation of cell structure and reacted easily to the degranulating agent Compound 48/80. Practically all mast cells could be recovered from the peritoneal cell suspension. Percoll was found to be superior to earlier isolation procedures by giving a practically pure and intact mast cell suspension and by avoiding cell aggregation.
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PMID:Rapid separation of rat peritoneal mast cells with Percoll. 624 64

Rat mast cells from peritoneal washings were purified by centrifugation on a medium containing silica particles coated with PVP (Percoll). By isopycnic centrifugation on continuous Percoll gradients, the buoyant density of mast cells ranged from 1.09 to 1.17 and was consistently lower in mast cells from younger rats than in mast cells from older rats. In suspensions uncontaminated with blood, the mast cells could be isolated by a simple centrifugation procedure based on density differences (step I). Contaminating red blood cells were removed by a second short centrifugation of velocity gradient type, using a linear Percoll gradient of low density. The mast cell purity was 91-98% and the recovery 63-100%. Purified mast cells reacted normally in a viability test employing fluorescein diacetate, retained amines and heparin, and reacted normally with amine release following incubation with Polymyxin B or antigen (immunised rats). Electron microscopy revealed excellent ultrastructural preservation of the mast cells and infrequent uptake of Percoll particles by endocytosis.
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PMID:Isolation of rat peritoneal mast cells by centrifugation on density gradients of Percoll. 746 42

A liposomal hydrogel with 3% povidone-iodine (PVP-ILH, Repithel) has shown clinical benefit in settings where inflammation and/or reactive oxygen species are thought to impede wound healing (e.g., burns, chronic wounds and in smokers). This in vitro study investigated whether PVP-ILH is able to reduce inflammatory events responsible for the impairment of the wound healing process in such patients. Therefore, the following assays were conducted with PVP-ILH (and derived control hydrogels to identify the component responsible for the effect): inhibition of reactive oxygen species production by human polymorphonuclear neutrophils (PMNs) and in a cell-free system, oxygen consumption assay of PMNs (prior to oxidative burst), inhibition of human complement (limiting the generation of complement factors), mast cell degranulation, nitric oxide production by murine macrophages and TNF-alpha production by human monocytes/macrophages. Where toxicity could cause cell inhibition, cell viability was assessed. PVP-ILH and its components interacted in our series of bioassays at various stages in the inflammation cascade. Scavenging of superoxide anions was the most pronounced effect. Furthermore, povidone-iodine inhibited PMN production of reactive oxygen species (inhibition of oxygen consumption) and a mast cell inhibitory (stabilising) activity was observed. Based on these results, the clinically observed, beneficial wound healing effects of PVP-ILH may also be attributed to an impediment of inflammatory activity, mainly by iodine's free radical scavenging. Controlling oxidative stress in the wound may be of great importance, especially since further reactions as, e.g., the formation of peroxynitrite from NO and ROS are prevented.
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PMID:Anti-inflammatory properties of a liposomal hydrogel with povidone-iodine (Repithel) for wound healing in vitro. 1837 99

Inflammation of the eye is a usual clinical condition that can implicate any part of the eye. The nomenclature of variety of such inflammations is based on the ocular part involved. These diseases may jeopardize normal functioning of the eye on progression. In general, corticosteroids, antihistamines, mast cell stabilizers and non-steroidal anti-inflammatory drugs (NSAIDs) are used to treat inflammatory diseases/disorders of the eye. There have been several attempts via different approaches of drug delivery to overcome the low ocular bioavailability resulting from shorter ocular residence time. The features like safety, ease of elimination and ability to sustain drug release have led to application of biopolymers in ocular therapeutics. Numerous polymers of natural origin such as gelatin, collagen, chitosan, albumin, hyaluronic acid, alginates etc. have been successfully employed for preparation of different ocular dosage forms. Chitosan is the most explored biopolymer amongst natural biopolymers because of its inherent characteristics. The emergence of synthetic biopolymers (like PVP, PACA, PCL, POE, polyanhydrides, PLA, PGA and PLGA) has also added new dimensions to the drug delivery strategies meant for treatment of ophthalmic inflammations. The current review is an endeavor to describe the utility of a variety of biomaterials/polymers based drug delivery systems as carrier for anti-inflammatory drugs in ophthalmic therapeutics.
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PMID:Overview of biopolymers as carriers of antiphlogistic agents for treatment of diverse ocular inflammations. 2728 77