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首页> 外文期刊>Journal of bone and mineral research: the official journal of the American Society for Bone and Mineral Research >Human osteoblastic cells propagate intercellular calcium signals by two different mechanisms.
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Human osteoblastic cells propagate intercellular calcium signals by two different mechanisms.

机译:人成骨细胞通过两种不同的机制传播细胞间钙信号。

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摘要

Effective bone remodeling requires the coordination of bone matrix deposition by osteoblastic cells, which may occur via soluble mediators or via direct intercellular communication. We have previously identified two mechanisms by which rat osteoblastic cell lines coordinate calcium signaling among cells: autocrine activation of P2 (purinergic) receptors leading to release of intracellular calcium stores, and gap junction-mediated communication resulting in influx of extracellular calcium. In the current work we asked whether human osteoblastic cells (HOB) were capable of mechanically induced intercellular calcium signaling, and if so, by which mechanisms. Upon mechanical stimulation, human osteoblasts propagated fast intercellular calcium waves, which required activation of P2 receptors and release of intracellular calcium stores but did not require calcium influx or gap junctional communication. After the fast intercellular calcium waves were blocked, we observed slower calcium waves that were dependent on gap junctional communication and influx of extracellular calcium. These results show that human osteoblastic cells can propagate calcium signals from cell to cell by two markedly different mechanisms and suggest that these two pathways may serve different purposes in coordinating osteoblast functions.
机译:有效的骨重塑需要成骨细胞协调骨基质的沉积,这可能通过可溶性介质或直接的细胞间通讯发生。我们以前已经确定了大鼠成骨细胞系协调细胞间钙信号传导的两种机制:P2(嘌呤能)受体的自分泌激活导致细胞内钙存储的释放,间隙连接介导的通讯导致细胞外钙的流入。在当前的工作中,我们询问人类成骨细胞(HOB)是否能够机械诱导细胞间钙信号传导,如果能够,则通过哪种机制。在机械刺激下,人类成骨细胞传播快速的细胞间钙波,这需要激活P2受体并释放细胞内钙存储,但不需要钙流入或间隙连接通讯。在快速的细胞间钙波被阻断后,我们观察到了较慢的钙波,这取决于间隙连接通讯和细胞外钙的流入。这些结果表明,人类成骨细胞可以通过两种明显不同的机制将钙信号从一个细胞传播到另一个细胞,这表明这两种途径在协调成骨细胞功能方面可能发挥不同的作用。

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