DOOKIE, S., 2010. Transglutaminase in the life and death of the pancreatic β-cell. PhD, Nottingham Trent University.
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Tissue transglutaminase (TG2) is a ubiquitous enzyme that catalyses both the Ca2+-dependent formation of protein cross-links via intermolecular isopeptide bonds, and the Ca2+-independent hydrolysis of GTP. The multifunctional nature of the TG2 protein has been reported in numerous intracellular mechanisms, cell-surface associations, and extracellular matrix (ECM) interactions. In the pancreas, the expression of TG may be fundamental to the insulin-secretion function of β-cells, and associated diabetic disorders. The functional roles of TG2 in the pancreas were investigated in the present study using in vitro models of rat pancreatic insulinoma β-cells (BRIN-BD11), and ex vivo islet of Langerhans models from human, rat, TG2(-/-) knockout mice and their wild-type counterparts. The importance of ECM-associated TG2 in the maintenance of β-cell survival and function was also investigated using an in vitro human urinary bladder carcinoma support matrix (5637 cells). Biochemical analysis of both clonal BRIN-BD11 and islet β-cells showed a thiol-dependent TG2 activity mechanism that was reciprocally regulated by Ca2+ and GTP.
|Divisions:||Schools > School of Science and Technology|
|Depositing User:||EPrints Services|
|Date Added:||09 Oct 2015 09:36|
|Last Modified:||09 Oct 2015 09:36|
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