The present research examines the effects of 4-nonylphenol (4-NP) on mouse primary calvarial osteoblasts (COBs). Incubation of the cells with 4-NP at 10(-5)M and 10(-6)M striking decreased osteoblasts viability and phosphatidylserine (PS) exposure, measured by Annexin V, was greatly enhanced. In addition, an up-regulation of Bax/Bcl2 ratio with a drop in ΔΨm and an increase of cleaved caspase 9 and 3 was found, suggesting that the alkylphenol induced osteoblast death via the mitochondrial-dependent apoptotic pathway. Interestingly, treatment with 4-NP was also able to increase cleaved caspase 8 in parallel with the truncated active Bid (t-Bid) suggesting that 4-NP-mediated apoptosis depends on cross talk between the extrinsic and intrinsic pathways. It is of relevance, that the apoptotic effects of 4-NP overcame 17-β-Estradiol (17-β E(2)) induced-survival on osteoblasts. Also, the alkylphenol interfered with 17-β E(2) regulated estrogen receptors expression.

4-Nonylphenol triggers apoptosis and affects 17-Beta-Estradiol receptors in calvarial osteoblasts

SABBIETI, Maria Giovanna;AGAS, DIMITRIOS;PALERMO, Francesco Alessandro;MOSCONI, Gilberto;SANTONI, Giorgio;AMANTINI, Consuelo;FARFARIELLO, Valerio;MARCHETTI, Luigi
2011

Abstract

The present research examines the effects of 4-nonylphenol (4-NP) on mouse primary calvarial osteoblasts (COBs). Incubation of the cells with 4-NP at 10(-5)M and 10(-6)M striking decreased osteoblasts viability and phosphatidylserine (PS) exposure, measured by Annexin V, was greatly enhanced. In addition, an up-regulation of Bax/Bcl2 ratio with a drop in ΔΨm and an increase of cleaved caspase 9 and 3 was found, suggesting that the alkylphenol induced osteoblast death via the mitochondrial-dependent apoptotic pathway. Interestingly, treatment with 4-NP was also able to increase cleaved caspase 8 in parallel with the truncated active Bid (t-Bid) suggesting that 4-NP-mediated apoptosis depends on cross talk between the extrinsic and intrinsic pathways. It is of relevance, that the apoptotic effects of 4-NP overcame 17-β-Estradiol (17-β E(2)) induced-survival on osteoblasts. Also, the alkylphenol interfered with 17-β E(2) regulated estrogen receptors expression.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11581/219261
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