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• W2564270310 abstract "Uncoupling protein 2 (UCP2) has been suggested to inhibit mitochondrial production of reactive oxygen species (ROS) by decreasing the mitochondrial membrane potential. Experimental acute pancreatitis is associated with increased UCP2 expression, whereas UCP2 deficiency retards regeneration of aged mice from acute pancreatitis. Here, we have addressed biological and molecular functions of UCP2 in pancreatic stellate cells (PSCs), which are involved in pancreatic wound repair and fibrogenesis.PSCs were isolated from 12 months old (aged) UCP2-/- mice and animals of the wild-type (WT) strain C57BL/6. Proliferation and cell death were assessed by employing trypan blue staining and a 5-bromo-2'-deoxyuridine incorporation assay. Intracellular fat droplets were visualized by oil red O staining. Levels of mRNA were determined by RT-PCR, while protein expression was analyzed by immunoblotting and immunofluorescence analysis. Intracellular ROS levels were measured with 2', 7'-dichlorofluorescin diacetate. Expression of senescence-associated beta-galactosidase (SA beta-Gal) was used as a surrogate marker of cellular senescence.PSCs derived from UCP2-/- mice proliferated at a lower rate than cells from WT mice. In agreement with this observation, the UCP2 inhibitor genipin displayed dose-dependent inhibitory effects on WT PSC growth. Interestingly, ROS levels in PSCs did not differ between the two strains, and PSCs derived from UCP2-/- mice did not senesce faster than those from corresponding WT cells. PSCs from UCP2-/- mice and WT animals were also indistinguishable with respect to the activation-dependent loss of intracellular fat droplets, expression of the activation marker alpha-smooth muscle actin, type I collagen and the autocrine/paracrine mediators interleukin-6 and transforming growth factor-beta1.A reduced proliferative capacity of PSC from aged UCP2-/- mice may contribute to the retarded regeneration after acute pancreatitis. Apart from their slower growth, PSC of UCP2-/- mice displayed no functional abnormalities. The antifibrotic potential of UCP2 inhibitors deserves further attention." @default.
• W2564270310 created "2017-01-06" @default.
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• W2564270310 date "2016-12-01" @default.
• W2564270310 modified "2023-09-24" @default.
• W2564270310 title "Uncoupling protein 2 deficiency reduces proliferative capacity of murine pancreatic stellate cells" @default.
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• W2564270310 doi "https://doi.org/10.1016/s1499-3872(16)60154-6" @default.
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• W2564270310 hasPublicationYear "2016" @default.
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