کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1931804 1050563 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elevated extracellular calcium increases expression of bone morphogenetic protein-2 gene via a calcium channel and ERK pathway in human dental pulp cells
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Elevated extracellular calcium increases expression of bone morphogenetic protein-2 gene via a calcium channel and ERK pathway in human dental pulp cells
چکیده انگلیسی

Dental pulp cells, which have been shown to share phenotypical features with osteoblasts, are capable of differentiating into odontoblast-like cells and generating a dentin-like mineral structure. Elevated extracellular Ca2+Cao2+ has been implicated in osteogenesis by stimulating the proliferation and differentiation of osteoblasts; however, the role of Cao2+ signaling in odontogenesis remains unclear. We found that elevated Cao2+ increases bone morphogenetic protein (BMP)-2 gene expression in human dental pulp cells. The increase was modulated not only at a transcriptional level but also at a post-transcriptional level, because treatment with Ca2+ increased the stability of BMP-2 mRNA in the presence of actinomycin D, an inhibitor of transcription. A similar increase in BMP-2 mRNA level was observed in other human mesenchymal cells from oral tissue; periodontal ligament cells and gingival fibroblasts. However, the latter cells exhibited considerably lower expression of BMP-2 mRNA compared with dental pulp cells and periodontal ligament cells. The BMP-2 increase was markedly inhibited by pretreatment with an extracellular signal-regulated kinase (ERK) inhibitor, PD98059, and partially inhibited by the L-type Ca2+ channels inhibitor, nifedipine. However, pretreatment with nifedipine had no effect on ERK1/2 phosphorylation triggered by Ca2+, suggesting that the Ca2+ influx from Ca2+ channels may operate independently of ERK signaling. Dental pulp cells do not express the transcript of Ca2+-sensing receptors (CaSR) and only respond slightly to other cations such as Sr2+ and spermine, suggesting that dental pulp cells respond to Cao2+ to increase BMP-2   mRNA expression in a manner different from CaSR and rather specific for Cao2+ among cations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 394, Issue 4, 16 April 2010, Pages 1093–1097
نویسندگان
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