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Oligodendrocytes are a type of glial cell, non-neuronal cells in the central nervous system.They arise during development from oligodendrocyte precursor cells (OPCs), [8] which can be identified by their expression of a number of antigens, including the ganglioside GD3, [9] [10] [11] the NG2 chondroitin sulfate proteoglycan, and the platelet-derived growth factor-alpha receptor subunit (PDGF ...
Oligodendrocyte progenitor cells (OPCs), also known as oligodendrocyte precursor cells, NG2-glia, O2A cells, or polydendrocytes, are a subtype of glia in the central nervous system named for their essential role as precursors to oligodendrocytes and myelin. [1] They are typically identified in the human by co-expression of PDGFRA and CSPG4.
Pentagalloylglucose, or more specificially 1,2,3,4,6-penta-O-galloyl-β-D-glucose, is the pentagallic acid ester of glucose. It is a gallotannin and the precursor of ellagitannins. [1] Pentagalloylglucose can precipitate proteins, [2] including human salivary α-amylase. [3]
Glycogen is a highly branched structure, consisting of the core protein Glycogenin, surrounded by branches of glucose units, linked together. [ 2 ] [ 12 ] The branching of glycogen increases its solubility, and allows for a higher number of glucose molecules to be accessible for breakdown at the same time. [ 2 ]
It is responsible for the low level of basal glucose uptake required to sustain respiration in all cells. Levels in cell membranes are increased by reduced glucose levels and decreased by increased glucose levels. GLUT1 expression is upregulated in many tumors. GLUT2: Is a bidirectional transporter, allowing glucose to flow in 2 directions.
Glucose transporters are classified into three groups based on sequence similarity, with a total of 14 members.All GLUT proteins share a common structure: 12 transmembrane segments, a single N-linked glycosylation site, a large central cytoplasmic linker, and both N- and C-termini located in the cytoplasm. [3]
The second phase is a slow release of newly formed vesicles that are triggered regardless of the blood sugar level. Glucose enters the beta cells and goes through glycolysis to form ATP that eventually causes depolarization of the beta cell membrane (as explained in Insulin secretion section of this article). The depolarization process causes ...
Amylopectin / ˌ æ m ɪ l oʊ ˈ p ɛ k t ɪ n / is a water-insoluble [1] [2] polysaccharide and highly branched polymer of α-glucose units found in plants. It is one of the two components of starch, the other being amylose. Relation of amylopectin to starch granule. Plants store starch within specialized organelles called amyloplasts. To ...