Abstract
Ovariectomy (OVX)-induced bone loss has been linked to increased bone turnover and higher bone matrix collagen degradation as the result of osteoclast activation. However, the role of degraded collagen matrix in the fate of resident bone-forming cells is unclear. In this report, we show that OVX-induced bone loss is associated with profound decreases in collagen 1 and Sirt1. This was accompanied by increases in expression and activity of the senescence marker collagenase and expression of p16/p21 in bone. Feeding a diet supplemented with blueberries (BB) to pre-pubertal rats throughout development or only prior to puberty [postnatal day 21 (PND21) to PND34] prevents OVX-induced effects on expression of these molecules at PND68. In order to provide more evidence and gain a better understanding on the association between bone collagen matrix and resident bone cell fate, in vitro studies on the cellular senescence pathway using primary calvarial cells and three cell lines (ST2 cells, OB6, and MLO-Y4) were conducted. We found that senescence was inhibited by collagen in a dose–response manner. Treatment of cells with serum from OVX rats accelerated osteoblastic cell senescence pathways, but serum from BB-fed OVX rats had no effect. In the presence of low collagen or treatment with OVX rat serum, ST2 cells exhibited higher potential to differentiate into adipocytes. Finally, we demonstrated that bone cell senescence is associated with decreased Sirt1 expression and activated p53, p16, and p21. These results suggest that (1) a significant prevention of OVX-induced bone cell senescence from adult rats can occur after only 14 days consumption of a BB-containing diet immediately prior to puberty, and (2) the molecular mechanisms underlying this effect involves, at least in part, prevention of collagen degradation.
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Acknowledgments
We would like to thank the following people for their technical assistance: Matt Ferguson, Trae Pittman, and Tammy Dallari. This study was supported by ARS CRIS #6251-51000-005-03S.
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Supplemental Table 1
Real-time reverse-transcription polymerase chain reaction (RT-PCR) primer sequences (DOC 62 kb)
Supplemental Table 2
Senescence-associated beta-galactosidase (SABG) activity in OB6 cells (PPT 128 kb)
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Zhang, J., Lazarenko, O.P., Blackburn, M.L. et al. Blueberry consumption prevents loss of collagen in bone matrix and inhibits senescence pathways in osteoblastic cells. AGE 35, 807–820 (2013). https://doi.org/10.1007/s11357-012-9412-z
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DOI: https://doi.org/10.1007/s11357-012-9412-z