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

Heparan sulfate 6-O-sulfotransferase (HS6ST) is an enzyme involved in heparan sulfate (HS) biosynthesis that transfers a sulfate residue to position 6 of the GlcNAc/GlcNSO(3) residues of HS, and it consists of three isoforms. Heparin, the highly sulfated form of HS, resides in connective tissue mast cells and is involved in the storage of mast cell proteases (MCPs). However, it is not well understood which isoform(s) of HS6ST participates in 6-O-sulfation of heparin and how the 6-O-sulfate residues in heparin affect MCPs. To investigate these issues, we prepared fetal skin-derived mast cells (FSMCs) from wild type (WT) and HS6ST-deficient mice (HS6ST-1(-/-), HS6ST-2(-/-), and HS6ST-1(-/-)/HS6ST-2(-/-)) and determined the structure of heparin, the protease activity, and the mRNA expression of each MCP in cultured FSMCs. The activities of tryptase and carboxypeptidase-A were decreased in HS6ST-2(-/-)-FSMCs in which 6-O-sulfation of heparin was decreased at 50% of WT-FSMCs and almost lost in HS6ST-1(-/-)/HS6ST-2(-/-)-FSMCs, which lacked the 6-O-sulfation in heparin nearly completely. In contrast, chymase activity was retained even in HS6ST-1(-/-)/HS6ST-2(-/-)-FSMCs. Each MCP mRNA was not decreased in any of the mutant FSMCs. Western blot analysis showed that tryptase (mMCP-6) was almost absent from HS6ST-1(-/-)/HS6ST-2(-/-)-FSMCs indicating degradation/secretion of the enzyme protein. These observations suggest that both HS6ST-1 and HS6ST-2 are involved in 6-O-sulfation of heparin and that the proper packaging and storage of tryptase, carboxypeptidase-A, and chymase may be regulated differently by the 6-O-sulfate residues in heparin. It is thus likely that 6-O-sulfation of heparin plays important roles in regulating MCP functions.
 ...
PMID:Heparan sulfate 6-O-sulfotransferase isoform-dependent regulatory effects of heparin on the activities of various proteases in mast cells and the biosynthesis of 6-O-sulfated heparin. 2322 49

To gain insight for the role of mast cell-produced heparin in the regulation of epidermal homeostasis and skin pigmentation, we have investigated the effect of heparin on melanosome uptake and proinflammatory responses in normal human epidermal keratinocytes (NHEKs). We quantified phagocytic activity of NHEKs with uptake of melanosomes or fluorescent microspheres. Heparin exhibited the inhibitory effect on keratinocyte phagocytosis through blocking PI3k/Akt and MEK/ERK signaling pathways. In fact, the heparin-treated NHEKs showed impaired activation of Akt and ERK during phagocytosis, whereas PI3k and MEK inhibitors significantly suppressed melanosome uptake by NHEKs. In addition, the inflammation marker cycloxygenase-2 (COX-2) expression and prostaglandin E2 (PGE2 ) production were induced during phagocytosis, while these effects were downregulated in the presence of heparin. Our observations suggest that heparin may play an antiphagocytic and anti-inflammation role in epidermis of human skin.
...
PMID:Heparin inhibits melanosome uptake and inflammatory response coupled with phagocytosis through blocking PI3k/Akt and MEK/ERK signaling pathways in human epidermal keratinocytes. 2496 76

Heparin, a member of a family of molecules called glycosaminoglycans, is biosynthesized in mucosal mast cells. This important anticoagulant polysaccharide is primarily produced by extraction of the mast cell-rich intestinal mucosa of hogs. There is concern about our continued ability to supply sufficient heparin to support the worldwide growth of advanced medical procedures from the static population of adult hogs used as food animals. While the intestinal mucosa of adult pigs is rich in anticoagulant heparin (containing a few hundred milligrams per animal), little is known about how the content of heparin changes with animal age. Using sophisticated mass spectral analysis we discovered that heparin was largely absent from the intestinal mucosa of piglets. Moreover, while the related, nonanticoagulant heparan sulfate glycosaminoglycan was present in significant amounts we found little chondroitin sulfate E also associated with mast cells. Histological evaluation of piglet intestinal mucosa showed a very low mast cell content. Respiratory mast cells have been reported in baby pigs suggesting that there was something unique about the piglets used in the current study. These piglets were raised in the relatively clean environment of a university animal facility and treated with antibiotics over their lifetime resulting in a depleted microbiome that greatly reduced the number of mast cells and heparin content of the intestinal mucosal in these animals. Thus, from the current study it remains unclear whether the lack of intestinal mast cell-derived heparin results from the young age of these animals or their exposure to their depleted microbiome.
 ...
PMID:Surprising absence of heparin in the intestinal mucosa of baby pigs. 2774 71

Anaphylaxis is a life-threatening allergic reaction. It is triggered by the release of pro-inflammatory cytokines and mediators from mast cells and basophils in response to immunologic or non-immunologic mechanisms. Mediators that are released upon mast cell activation include the highly sulfated polysaccharide and inorganic polymer heparin and polyphosphate (polyP), respectively. Heparin and polyP supply a negative surface for factor XII (FXII) activation, a serine protease that drives contact system-mediated coagulation and inflammation. Activation of the FXII substrate plasma kallikrein leads to further activation of zymogen FXII and triggers the pro-inflammatory kallikrein-kinin system that results in the release of the mediator bradykinin (BK). The severity of anaphylaxis is correlated with the intensity of contact system activation, the magnitude of mast cell activation, and BK formation. The main inhibitor of the complement system, C1 esterase inhibitor, potently interferes with FXII activity, indicating a meaningful cross-link between complement and kallikrein-kinin systems. Deficiency in a functional C1 esterase inhibitor leads to a severe swelling disorder called hereditary angioedema (HAE). The significance of FXII in these disorders highlights the importance of studying how these processes are integrated and can be therapeutically targeted. In this review, we focus on how FXII integrates with inflammation and the complement system to cause anaphylaxis and HAE as well as highlight current diagnosis and treatments of BK-related diseases.
 ...
PMID:Factor XII-Driven Inflammatory Reactions with Implications for Anaphylaxis. 2896 16

Mast cell take active part in immune system of body, clinical manifestations are closely related to hypersensitivity. Reactions and potent biological mediators released by these cells are responsible for different clinical manifestation like allergic reaction. Frequent and important sites of these allergic reactions occur in-upper aero digestive tract, nasal, pharyngeal and respiratory allergies. The study aims to demonstrate different types of heparin in mast cells having role in tonsillitis. Present work is to study distribution and histochemical nature of mast cells in human palatine tonsil in patients suffering from chronic tonsillitis. 20 cases were studied during the study. Diagnosis was done on clinical criteria-Anterior pillar flushing. Expulsion of cheesy material from the tonsillar crypts on pressing with tongue depressor. Palpable jugulodigastric group of lymph nodes. Dissected Tonsillar material fixed into fixative-staining done. For qualitative histological observation Harris Haemotoxylene with eosin used as counter stain. Normal Histological study of mast cell like size, shape, granules were done. Distribution of mast cells in different parts of Tonsillar Tissue was observed. Histochemical study of mast cells to determine nature of reactive substance was done. Tonsil contains mucous glands, no granular tissue in present study of chronic inflammatory reactions feasible in form of fibrosis, lymphatic infiltration in epithelium. Morphology of mast cells with toluidine blue at pH 2 and 4.4 gave better picture. Mast cells had varied shape and size in different places and points of same field of focus, oval, elongated, fusiform, pleomorphic in shape. Nucleus is central ill-defined masked by granules. Cytoplasm contains mast cell granules that stained blue with Alcian blue stain, purple to bluish purple with toluidine blue. Distribution of mast cells in present study: Mast cells were found at all places mostly concentrated at capsules. Lamina propria-1-2/hpf, capsule-4-5/hpf, connective tissue septa-1-2/hpf. Histochemical Feature- In present study, histochemical study remained confined to connective tissue septa of mast cells and biochemical nature of Heparin contained in it. In present work, the identification of mast cells is based on metachromatic reactions of its granules with acidified toluidine blue at pH 2 and buffered toluidine blue at pH 4.4 to identify mast cell granules containing higher and lower sulphates of heparin.
 ...
PMID:Histological and Histochemical Observations on Mast Cell and Glands in Chronic Tonsillitis. 3174 25


<< Previous 1 2 3 4 5 6