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• W2058903869 abstract "Gravity acts permanently on organisms as either static or dynamic stimulation. Understanding the influence of gravitational and mechanical stimuli on biological systems is an intriguing scientific problem. More than two decades of life science studies in low g, either real or modeled by clinostats, as well as experimentation with devices simulating different types of controlled mechanical stimuli, have shown that important biological functions are altered at the single cell level. Here, we show that the human leukemic line FLG 29.1, characterized as an osteoclastic precursor model, is directly sensitive to gravitational unloading, modeled by a random positioning machine (RPM). The phenotypic expression of cytoskeletal proteins, osteoclastic markers, and factors regulating apoptosis was investigated using histochemical and immunohistochemical methods, while the expression of the corresponding genes was analyzed using RT-PCR. A quantitative bone resorption assay was performed. Autofluorescence spectroscopy and imaging were applied to gain information on cell metabolism. The results show that modeled hypogravity may trigger both differentiation and apoptosis in FLG 29.1 cells. Indeed, when comparing RPM versus 1 × g cultures, in the former we found cytoskeletal alterations and a marked increase in apoptosis, but the surviving cells showed an osteoclastic-like morphology, overexpression of osteoclastic markers and the ability to resorb bone. In particular, the overexpression of both RANK and its ligand RANKL, maintained even after return to 1 × g conditions, is consistent with the firing of a differentiation process via a paracrine/autocrine mechanism. J. Cell. Biochem. 98: 65–80, 2006. © 2005 Wiley-Liss, Inc." @default.
• W2058903869 created "2016-06-24" @default.
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• W2058903869 date "2006-01-01" @default.
• W2058903869 modified "2023-10-18" @default.
• W2058903869 title "Modeled gravitational unloading triggers differentiation and apoptosis in preosteoclastic cells" @default.
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• W2058903869 doi "https://doi.org/10.1002/jcb.20747" @default.
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