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• W1991436817 abstract "During winter hibernation, grizzly bears (Ursus arctos horribilis) do not eat but instead rely on internal fat stores as a primary source of metabolic energy. The resulting seasonal fluctuations in appetite and body mass make the grizzly bear a naturally occurring animal model for human conditions such as obesity and anorexia. An in vitro model of hibernating bear stem cells might enhance our understanding of processes such as stem cell proliferation and differentiation. Mesenchymal stem cells, derived from bone marrow and adipose tissue among others, differentiate into adipocytes and might play important roles in energy metabolism. In the current study, we examined the in vitro viability and morphology of mesenchymal stem cells isolated from grizzly bear adipose tissue (ADSC) and bone marrow (BMSC); these ADSC and BMSCs underwent adipogenic differentiation for 0, 7, 14, 21, and 28 days. Bone marrow stem cells and ADSC were isolated using mechanical disaggregation, collagenase digestion, centrifugation, and plating onto tissue culture polystyrene. Cell viability and proliferation was quantified using the colony forming unit assay and a hemocytometer. Both stem cell types were differentiated into adipocytes using 10 μM insulin, 1 μM dexamethasone, and 0.5 mM isobutylmethylxanthine (all Sigma- Aldrich, St. Louis, MO, USA) with the addition of 10% fetal bovine (FBS) or bear serum from the active feeding period. Adipogenic differentiation was confirmed using Oil Red O and quantified using ImageJ. Statistical analysis was performed using an unpaired t-test between treatments of the same time point. All cells were isolated within 28 h of tissue harvest. Adipose-derived stem cells formed an average of 11 colonies (0.011%), whereas BMSC formed 1.5 colonies (0.0015%) per 100 000 cells. Doubling time forADSC was approximately 54 h in 10% FBS. BothADSC and BMSC had an initial spindle-shaped morphology, which gradually became more rounded during adipogenic differentiation. For bear serum at Day 28, ADSC had a significantly (P < 0.01) greater stained area per cell than did BMSC. In summary, both types of mesenchymal stem cells successfully differentiated into adipocytes and maintained viability. In conclusion, grizzly bear mesenchymal stem cells canbesuccessfully isolated, expanded, and differentiated in culture. These results allow for future studies using the bear as an in vitro model for fat metabolism during hibernation and active periods. This work was partially supported by the Carle Foundation Hospital, the Intel Scholar’s Research Program, USDA Multi-State Research Project W1171, and the Illinois Regenerative Medicine Institute (IDPH # 63080017). In addition, the authors would like to thank Agatha Luszpak for support with the analysis." @default.
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• W1991436817 date "2010-01-01" @default.
• W1991436817 modified "2023-10-12" @default.
• W1991436817 title "390 ISOLATION AND ADIPOGENESIS OF GRIZZLY BEAR MESENCHYMAL STEM CELLS" @default.
• W1991436817 doi "https://doi.org/10.1071/rdv22n1ab390" @default.
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