Crocin protects against dexamethasone‑induced osteoblast apoptosis by inhibiting the ROS/Ca2+‑mediated mitochondrial pathway

Nie,Zhigang; Deng,Shuang; Zhang,Lei; Chen,Sen; Lu,Qiang; Peng,Hao

doi:10.3892/mmr.2019.10267

Crocin protects against dexamethasone‑induced osteoblast apoptosis by inhibiting the ROS/Ca2+‑mediated mitochondrial pathway

Authors:
- Zhigang Nie
- Shuang Deng
- Lei Zhang
- Sen Chen
- Qiang Lu
- Hao Peng
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Affiliations: Department of Orthopedics, Renmin Hospital of Wuhan University, Wuhan, Hubei 430060, P.R. China
Published online on: May 22, 2019 https://doi.org/10.3892/mmr.2019.10267
Pages: 401-408
Copyright: © Nie et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Osteoblast apoptosis has been identified as an important event in the development of glucocorticoid (GC)‑induced osteoporosis and osteonecrosis of the femoral head. Crocin, a bioactive ingredient of saffron, has been demonstrated to induce antiapoptotic effects on numerous types of cell in vitro; however, the effects of crocin on the dexamethasone (Dex)‑induced apoptosis of osteoblasts remain unclear. In the present study, the protective effects of crocin during Dex‑induced apoptosis of MC3T3‑E1 osteoblasts, and the underlying mechanisms, were investigated. MTT and Annexin V‑FITC/PI flow cytometry assays were performed to evaluate the viability and apoptosis of cells, respectively. The mitochondrial transmembrane potential, reactive oxygen species (ROS), intracellular Ca2+ levels and apoptosis‑associated protein expression were assessed via flow cytometry, fluorescence microscopy and western blotting. It was demonstrated that crocin pretreatment inhibited Dex‑induced apoptosis of osteoblasts in a dose‑dependent manner. Crocin reversed Dex‑induced decreases in the mitochondrial transmembrane potential, and increases in ROS and intracellular Ca2+ levels. Furthermore, crocin upregulated the expression levels of B‑cell lymphoma-2 (Bcl‑2) and mitochondrial cytochrome c (Cyt C), and downregulated those of cleaved caspase‑9, cleaved caspase‑3, Bcl‑2‑associated X protein and cytoplasmic Cyt C. N‑acetylcysteine, a ROS inhibitor, and 1,2‑bis(2‑aminophenoxy)ethane‑N,N,N',N'‑tetraacetic acid, a calcium chelator, attenuated Dex‑induced osteoblast apoptosis, whereas H2O2 and ionomycin, a calcium ionophore that increases intracellular calcium levels, reversed the antiapoptotic effects of crocin on Dex‑treated osteoblasts. These results indicated that crocin may protect osteoblasts from Dex‑induced apoptosis by inhibiting the ROS/Ca2+‑mediated mitochondrial pathway, thus suggesting that crocin has potential value as a treatment for GC‑induced bone diseases.

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