Abstract
Several studies have evidenced that in aging, osteoblast functional activity is impaired: osteoblast proliferation is slower and matrix deposition is less efficient. Because peroxisome-proliferator-activated receptor γ2 (PPARγ2) and fatty acids are important inhibitory signals in osteoblast development, we have investigated in human primary osteoblasts obtained from patients of different ages, the influence of retinoic acid and calcitriol on enzymes involved in differentiative (PPARγ2, β-catenin, and insulin-like growth factor 1) and metabolic (carnitine palmitoyltransferase 1) intracellular pathways, and on transglutaminase 2, as enzyme fundamental for stabilizing the newly deposited extracellular matrix in bone. Retinoic acid and calcitriol influenced, respectively, proliferation and differentiation of osteoblasts, and an increase in PPARγ2 expression was observed following retinoic acid administration, whereas a decrease was observed following calcitriol administration. Aging widely influenced all parameters analyzed (the proliferation, differentiation, and new matrix deposition are significantly reduced in aged osteoblasts), with the exception of PPARγ2, which we found to be constitutively overexpressed and not modulated by retinoic acid or calcitriol administration. Our findings show the impaired ability of aged osteoblasts to perform adequate functional response and draw attention to the therapeutic approaches for bone healing in elderly patients.
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The research work was supported by University of Eastern Piedmont funds (ex 60 %) and MIUR funds (PRIN 2012 prot. 201288JKYY).
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The authors declare they have no conflict of interest.
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M. Bosetti and M. Sabbatini contributed equally to this work.
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Bosetti, M., Sabbatini, M., Calarco, A. et al. Effect of retinoic acid and vitamin D3 on osteoblast differentiation and activity in aging. J Bone Miner Metab 34, 65–78 (2016). https://doi.org/10.1007/s00774-014-0642-2
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DOI: https://doi.org/10.1007/s00774-014-0642-2