Glycosaminoglycan synthesis in mouse mastocytoma.
Ontology highlight
ABSTRACT:
SUBMITTER: Helting T
PROVIDER: S-EPMC1178415 | biostudies-other | 1972 Feb
REPOSITORIES: biostudies-other
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Project description:Expression changes for tryptophan hydroxylase 1 (TPH1), the rate-limiting enzyme in serotonin synthesis, by environmental glutamine (GLN) were examined in mouse mastocytoma-derived P815-HTR cells. GLN-treated cells exhibited a robust increase in TPH1 mRNA after a 6 h exposure to GLN. 6-Diazo-5-oxo-L-norleucine (DON), a glutamine-utilizing glutaminase inhibitor, significantly inhibited the GLN-induction of TPH1 mRNA. Nuclear run-on assays and mRNA decay experiments demonstrated that the primary mechanism leading to increased TPH1 mRNA levels was not due to transcriptional changes, but rather due to increased TPH1 RNA stability induced by GLN. Treatment with GLN also led to activation of p38 MAP kinase, but not p42/44 MAPK. In addition, SB203580, a p38 MAP kinase specific inhibitor, completely abolished the GLN-mediated increase of TPH1 mRNA levels, suggesting the pathway stabilizing TPH1 mRNA might be mediated by the activated p38 MAP kinase pathway. Additionally, SB203580 significantly reduced the stability of TPH1 mRNA, and this reduction of the stability was not affected by GLN in the culture medium, implying a sequential signaling from GLN being mediated by p38 MAP kinase, resulting in alteration of TPH1 mRNA stability. TPH1 mRNA stability loss was also dependent on de novo protein synthesis as shown by treatment of cells with a transcriptional/translational blocker. We provide evidence that TPH1 mRNA levels are increased in response to increased exogenous GLN in mouse mastocytoma cells via a stabilization of TPH1 mRNA due to the activity of the p38 MAP kinase.
| S-EPMC9884262 | biostudies-literature
Project description:1. Heparin was prepared from mouse mastocytoma tissue by mild procedures, including extraction of mast-cell granules with 2m-potassium chloride, precipitation of the extracted polysaccharide with cetylpyridinium chloride from 0.8m-potassium chloride and finally digestion of the isolated material with testicular hyaluronidase. The resulting product (fraction GE(H)) represented approx. 40% of the total heparin content of the tissue. 2. Fraction GE(H) was fractionated by gel chromatography on Sepharose 4B into three subfractions, with average molecular weights ( M(w)) of approx. 60000-70000 (highly polydisperse material), 26000 and 9000 respectively. Treatment of each of the subfractions with alkali or with papain did not affect their behaviour on gel chromatography. Amino acid and neutral sugar analyses indicated that the two low-molecular-weight fractions consisted largely of single polysaccharide chains lacking the carbohydrate-protein linkage region. It was suggested that these heparin molecules had been degraded by an endopolysaccharidase. 3. Pulse labelling in vivo of mastocytoma heparin with [(35)S]sulphate showed initial labelling of large molecules followed by a progressive shift of radioactivity toward fractions of lower molecular weight. Further, heparin-depolymerizing activity was demonstrated by incubating (35)S-labelled heparin in vitro with a mastocytoma 10000g-supernatant fraction. Appreciable degradation of the polysaccharide occurred, as demonstrated by gel chromatography. In contrast, no depolymerization was observed on subjecting (14)C-labelled chondroitin sulphate to the same procedure.
| S-EPMC1178276 | biostudies-other
Project description:We report the transcriptome sequencing results of the mouse mastocytoma cell line P815. After ESR1-specific shRNA vectors (SH) or the negative control vectors (NC) were transfected, the transcriptome in P815 after estrogen stimulation. We also detected the transcriptome of P815 cells after estrogen stimulation with the administration of estrogen receptor inhibitors Tamoxifen and ICI-182780.
2021-09-14 | GSE181773 | GEO
Project description:Biosynthesis and functions of glycosaminoglycan (GAG) chains are complex and remain elusive. To better understand the factors that regulate the biosynthesis and functions, fluorophore-tagged xylosides carrying two different linkages between fluorophore and xylose residue were synthesized and evaluated for their ability to prime GAG chains such as heparan sulfate (HS), chondroitin sulfate (CS), and dermatan sulfate (DS) in various cell lines. These in vitro studies resulted in the identification of fluorophore-tagged xylosides that prime high molecular weight GAG chains. Primed GAG chains carrying a fluorophore group has several advantages for studying the factors that regulate the biosynthesis, analyzing intact fine structures at low detection limits, and setting the stage for studying structure-function relations of GAG chains of cellular origin.
| S-EPMC3983138 | biostudies-literature
Project description:Pulse-labelling of mouse mastocytoma cell cultures, established from ascites fluid, with inorganic [35S]sulphate for 1 h yielded labelled heparin proteoglycan containing polysaccharide chains of Mr 60,000-100,000. After chase incubation for 24 h most of the 35S appeared in intracellular polysaccharide fragments similar in size to commercially available heparin, Mr 5000-25,000, as indicated by gel chromatography. Products isolated from cultures after 6 h of chase incubation consisted of partially degraded free polysaccharide chains and, in addition, residual proteoglycans that were of smaller size than the proteoglycans initially pulse-labelled. The polysaccharide chains released by alkali treatment from the residual chase-incubated proteoglycans were of the same size as the chains derived from proteoglycans after 1 h of pulse labelling. These results suggest that the intracellular degradation of heparin proteoglycan to polysaccharide fragments is initiated by release of intact polysaccharide chains, probably by action of a peptidase, and is pursued through cleavage of these chains by an endoglycosidase. An endoglucuronidase with stringent substrate specificity [Thunberg, Bäckström, Wasteson, Ogren & Lindahl (1982) J. Biol. Chem. 257, 10278-10282] has previously been implicated in the latter step. Cultures of more purified mastocytoma cells (essentially devoid of macrophages) did not metabolize [35S]heparin proteoglycan to polysaccharide fragments, but instead accumulated free intact polysaccharide chains, i.e. the postulated intermediate of the complete degradation pathway. When such purified cells were co-cultured with adherent mouse peritoneal cells, presumably macrophages, formation of polysaccharide fragments was observed. It is tentatively proposed that the expression of endoglucuronidase activity by the mast cells depends on collaboration between these cells and macrophages.
| S-EPMC1148290 | biostudies-other
Project description:The complete nucleotide sequence of a mouse mastocytoma proteoglycan core protein mRNA was determined. The mRNA, estimated to contain 1.1 kb, encodes a protein with an Mr of 16715. A 21-amino acid-residue region of the protein is composed of alternating serine and glycine residues. Southern-blot analysis of mouse genomic DNA with cDNA containing sequences corresponding to the Ser-Gly repeat region revealed more than 15 gene fragments. Hybridization with a probe corresponding to the N-terminal portion of the core protein identified two fragments, and cDNA covering the C-terminal part of the core protein and the 3' untranslated part of the mRNA hybridized to a single fragment. Antibodies against the core protein, obtained after immunization of rabbits with a fusion protein, reacted with both chondroitin sulphate proteoglycans and heparin proteoglycans produced by the tumour. In immunoblotting of a microsomal fraction from the mastocytoma, the antiserum recognized a single protein (Mr 17,000), which probably represents the core protein before glycosylation.
| S-EPMC1133396 | biostudies-other
Project description:Proteoglycans (PGs), biosynthetically labelled with [35S]sulphate, were isolated from mouse mastocytoma tissue. Chromatography on antithrombin (AT)-Sepharose resulted in the separation of the 35S-labelled PGs into three fractions: PGs with no affinity for the gel (NA-PGs), PGs with low affinity (LA-PGs), and PGs with high affinity (HA-PGs) for antithrombin. Whereas NA-PGs contained almost exclusively chondroitin sulphate (CS), the AT-binding PGs contained 80-85% heparin and 15-20% CS. [35S]CS-containing macromolecules obtained from the HA-PG fraction after removal of the heparin polysaccharide chains were rechromatographed on AT-Sepharose. A majority of these 35S-labelled macromolecules no longer showed affinity for AT. These experiments indicate that the [35S]CS recovered in the AT-binding PGs is present in hybrid PGs. Polysaccharide chain-length determination demonstrated that the heparin chains were somewhat larger (M(r) approximately 30,000) than the CS chains in the NA-PGs (M(r) approximately 25,000). CS chains in the hybrid PGs were slightly smaller (M(r) approximately 20,000). Characterization of the sulphated CS disaccharides from NA- and HA-PGs showed that they contained similar amounts (20%) of disulphated disaccharides of [GlcA-GalNAc(4,6-di-OSO3)] type. The monosulphated CS-disaccharides were O-sulphated at C-4 of the galactosamine units. Analysis by gel chromatography of the [35S]CS components isolated from HA-PGs after heparinase treatment showed that a major portion of these contained one CS chain only. Calculations of the number of CS and heparin chains in AT-binding PGs, based on polysaccharide composition and polysaccharide chain length, indicate that all heparin-containing PGs are hybrids.
| S-EPMC1136143 | biostudies-other
Project description:Heparin (HP), an important anticoagulant polysaccharide, is produced in a complex biosynthetic pathway in connective tissue-type mast cells. Both the structure and size of HP are critical factors determining the anticoagulation activity. A murine mastocytoma (MST) cell line was used as a model system to gain insight into this pathway. As reported, MST cells produce a highly sulfated HP-like polysaccharide that lacks anticoagulant activity (Montgomery RI, Lidholt K, Flay NW, Liang J, Vertel B, Lindahl U, Esko JD. 1992. Stable heparin-producing cell lines derived from the Furth murine mastocytoma. Proc Natl Acad Sci USA 89:11327-11331). Here, we show that transfection of MST cells with a retroviral vector containing heparan sulfate 3-O-sulfotransferase-1 (Hs3st1) restores anticoagulant activity. The MST lines express N-acetylglucosamine N-deacetylase/N-sulfotransferase-1, uronosyl 2-O-sulfotransferase and glucosaminyl 6-O-sulfotransferase-1, which are sufficient to make the highly sulfated HP. Overexpression of Hs3st1 in MST-10H cells resulted in a change in the composition of heparan sulfate (HS)/HP and CS/dermatan sulfate (DS) glycosaminoglycans. The cell-associated HS/HP closely resembles HP with 3-O-sulfo group-containing glucosamine residues and shows anticoagulant activity. This study contributes toward a better understanding of the HP biosynthetic pathway with the goal of providing tools to better control the biosynthesis of HP chains with different structures and activities.
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Project description:Chondrodysplasias with multiple dislocations form a group of severe disorders characterized by joint laxity and multiple dislocations, severe short stature of pre- and post-natal onset, hand anomalies, and/or vertebral anomalies. The majority of chondrodysplasias with multiple dislocations have been associated with mutations in genes encoding glycosyltransferases, sulfotransferases, and transporters implicated in the synthesis or sulfation of glycosaminoglycans, long and unbranched polysaccharides composed of repeated disaccharide bond to protein core of proteoglycan. Glycosaminoglycan biosynthesis is a tightly regulated process that occurs mainly in the Golgi and that requires the coordinated action of numerous enzymes and transporters as well as an adequate Golgi environment. Any disturbances of this chain of reactions will lead to the incapacity of a cell to construct correct glycanic chains. This review focuses on genetic and glycobiological studies of chondrodysplasias with multiple dislocations associated with glycosaminoglycan biosynthesis defects and related animal models. Strong comprehension of the molecular mechanisms leading to those disorders, mostly through extensive phenotypic analyses of in vitro and/or in vivo models, is essential for the development of novel biomarkers for clinical screenings and innovative therapeutics for these diseases.
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Project description:The influenza A viruses (IAVs) cause acute respiratory infection in both humans and animals. As a member of the initial lines of host defense system, the role of mast cells during IAV infection has been poorly understood. Here, we characterized for the first time that both avian-like (α-2, 3-linked) and human-like (α-2, 6- linked) sialic acid (SA) receptors were expressed by the mouse mastocytoma cell line (P815). The P815 cells did support the productive replication of H1N1 (A/WSN/33), H5N1 (A/chicken/ Henan/1/04) and H7N2 (A/chicken/Hebei/2/02) in vitro while the in vivo infection of H5N1 in mast cells was confirmed by the specific staining of nasal mucosa and lung tissue from mice. All the three viruses triggered the infected P815 cells to produce pro-inflammatory cytokines and chemokines including IL-6, IFN-γ, TNF-α, CCL-2, CCL-5, and IP-10, but not the antiviral type I interferon. It was further confirmed that TLR3 pathway was involved in P815 cell response to IAV-infection. Our findings highlight the remarkable tropism and infectivity of IAV to P815 cells, indicating that mast cells may be unneglectable player in the development of IAV infection.
| S-EPMC5226950 | biostudies-literature