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Elevation of extracellular Ca2+ induces store-operated calcium entry via calcium-sensing receptors: a pathway contributes to the proliferation of osteoblasts

AIMS: The local concentration of extracellular Ca(2+) ([Ca(2+)]o) in bone microenvironment is accumulated during bone remodeling. In the present study we investigated whether elevating [Ca(2+)]o induced store-operated calcium entry (SOCE) in primary rat calvarial osteoblasts and further examined the... Full description

Journal Title: PLoS ONE Vol.9(9), p.e107217
Main Author: Fen Hu
Other Authors: Leiting Pan , Kai Zhang , Fulin Xing , Xinyu Wang , Imshik Lee , Xinzheng Zhang , Jingjun Xu
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1932-6203 ; DOI: 10.1371/journal.pone.0107217
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title: Elevation of extracellular Ca2+ induces store-operated calcium entry via calcium-sensing receptors: a pathway contributes to the proliferation of osteoblasts
format: Article
creator:
  • Fen Hu
  • Leiting Pan
  • Kai Zhang
  • Fulin Xing
  • Xinyu Wang
  • Imshik Lee
  • Xinzheng Zhang
  • Jingjun Xu
subjects:
  • Sciences (General)
ispartof: PLoS ONE, Vol.9(9), p.e107217
description: AIMS: The local concentration of extracellular Ca(2+) ([Ca(2+)]o) in bone microenvironment is accumulated during bone remodeling. In the present study we investigated whether elevating [Ca(2+)]o induced store-operated calcium entry (SOCE) in primary rat calvarial osteoblasts and further examined the contribution of elevating [Ca(2+)]o to osteoblastic proliferation. METHODS: Cytosolic Ca(2+) concentration ([Ca(2+)]c) of primary cultured rat osteoblasts was detected by fluorescence imaging using calcium-sensitive probe fura-2/AM. Osteoblastic proliferation was estimated by cell counting, MTS assay and ATP assay. Agonists and antagonists of calcium-sensing receptors (CaSR) as well as inhibitors of phospholipase C (PLC), SOCE and voltage-gated calcium (Cav) channels were applied to study the mechanism in detail. RESULTS: Our data showed that elevating [Ca(2+)]o evoked a sustained increase of [Ca(2+)]c in a dose-dependent manner. This [Ca(2+)]c increase was blocked by TMB-8 (Ca(2+) release inhibitor), 2-APB and BTP-2 (both SOCE blockers), respectively, whereas not affected by Cav channels blockers nifedipine and verapamil. Furthermore, NPS2143 (a CaSR antagonist) or U73122 (a PLC inhibitor) strongly reduced the [Ca(2+)]o-induced [Ca(2+)]c increase. The similar responses were observed when cells were stimulated with CaSR agonist spermine. These data indicated that elevating [Ca(2+)]o resulted in SOCE depending on the activation of CaSR and PLC in osteoblasts. In addition, high [Ca(2+)]o significantly promoted osteoblastic proliferation, which was notably reversed by BAPTA-AM (an intracellular calcium chelator), 2-APB, BTP-2, TMB-8, NPS2143 and U73122, respectively, but not affected by Cav channels antagonists. CONCLUSIONS: Elevating [Ca(2+)]o induced SOCE by triggering the activation of CaSR and PLC. This process was involved in osteoblastic proliferation induced by high level of extracellular Ca(2+) concentration.
language: eng
source:
identifier: E-ISSN: 1932-6203 ; DOI: 10.1371/journal.pone.0107217
fulltext: fulltext_linktorsrc
issn:
  • 1932-6203
  • 19326203
url: Link


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titleElevation of extracellular Ca2+ induces store-operated calcium entry via calcium-sensing receptors: a pathway contributes to the proliferation of osteoblasts
creatorFen Hu ; Leiting Pan ; Kai Zhang ; Fulin Xing ; Xinyu Wang ; Imshik Lee ; Xinzheng Zhang ; Jingjun Xu
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descriptionAIMS: The local concentration of extracellular Ca(2+) ([Ca(2+)]o) in bone microenvironment is accumulated during bone remodeling. In the present study we investigated whether elevating [Ca(2+)]o induced store-operated calcium entry (SOCE) in primary rat calvarial osteoblasts and further examined the contribution of elevating [Ca(2+)]o to osteoblastic proliferation. METHODS: Cytosolic Ca(2+) concentration ([Ca(2+)]c) of primary cultured rat osteoblasts was detected by fluorescence imaging using calcium-sensitive probe fura-2/AM. Osteoblastic proliferation was estimated by cell counting, MTS assay and ATP assay. Agonists and antagonists of calcium-sensing receptors (CaSR) as well as inhibitors of phospholipase C (PLC), SOCE and voltage-gated calcium (Cav) channels were applied to study the mechanism in detail. RESULTS: Our data showed that elevating [Ca(2+)]o evoked a sustained increase of [Ca(2+)]c in a dose-dependent manner. This [Ca(2+)]c increase was blocked by TMB-8 (Ca(2+) release inhibitor), 2-APB and BTP-2 (both SOCE blockers), respectively, whereas not affected by Cav channels blockers nifedipine and verapamil. Furthermore, NPS2143 (a CaSR antagonist) or U73122 (a PLC inhibitor) strongly reduced the [Ca(2+)]o-induced [Ca(2+)]c increase. The similar responses were observed when cells were stimulated with CaSR agonist spermine. These data indicated that elevating [Ca(2+)]o resulted in SOCE depending on the activation of CaSR and PLC in osteoblasts. In addition, high [Ca(2+)]o significantly promoted osteoblastic proliferation, which was notably reversed by BAPTA-AM (an intracellular calcium chelator), 2-APB, BTP-2, TMB-8, NPS2143 and U73122, respectively, but not affected by Cav channels antagonists. CONCLUSIONS: Elevating [Ca(2+)]o induced SOCE by triggering the activation of CaSR and PLC. This process was involved in osteoblastic proliferation induced by high level of extracellular Ca(2+) concentration.
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titleElevation of extracellular Ca2+ induces store-operated calcium entry via calcium-sensing receptors: a pathway contributes to the proliferation of osteoblasts
description

AIMS: The local concentration of extracellular Ca(2+) ([Ca(2+)]o) in bone microenvironment is accumulated during bone remodeling. In the present study we investigated whether elevating [Ca(2+)]o induced store-operated calcium entry (SOCE) in primary rat calvarial osteoblasts and further examined the contribution of elevating [Ca(2+)]o to osteoblastic proliferation. METHODS: Cytosolic Ca(2+) concentration ([Ca(2+)]c) of primary cultured rat osteoblasts was detected by fluorescence imaging using calcium-sensitive probe fura-2/AM. Osteoblastic proliferation was estimated by cell counting, MTS assay and ATP assay. Agonists and antagonists of calcium-sensing receptors (CaSR) as well as inhibitors of phospholipase C (PLC), SOCE and voltage-gated calcium (Cav) channels were applied to study the mechanism in detail. RESULTS: Our data showed that elevating [Ca(2+)]o evoked a sustained increase of [Ca(2+)]c in a dose-dependent manner. This [Ca(2+)]c increase was blocked by TMB-8 (Ca(2+) release inhibitor), 2-APB and BTP-2 (both SOCE blockers), respectively, whereas not affected by Cav channels blockers nifedipine and verapamil. Furthermore, NPS2143 (a CaSR antagonist) or U73122 (a PLC inhibitor) strongly reduced the [Ca(2+)]o-induced [Ca(2+)]c increase. The similar responses were observed when cells were stimulated with CaSR agonist spermine. These data indicated that elevating [Ca(2+)]o resulted in SOCE depending on the activation of CaSR and PLC in osteoblasts. In addition, high [Ca(2+)]o significantly promoted osteoblastic proliferation, which was notably reversed by BAPTA-AM (an intracellular calcium chelator), 2-APB, BTP-2, TMB-8, NPS2143 and U73122, respectively, but not affected by Cav channels antagonists. CONCLUSIONS: Elevating [Ca(2+)]o induced SOCE by triggering the activation of CaSR and PLC. This process was involved in osteoblastic proliferation induced by high level of extracellular Ca(2+) concentration.

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AIMS: The local concentration of extracellular Ca(2+) ([Ca(2+)]o) in bone microenvironment is accumulated during bone remodeling. In the present study we investigated whether elevating [Ca(2+)]o induced store-operated calcium entry (SOCE) in primary rat calvarial osteoblasts and further examined the contribution of elevating [Ca(2+)]o to osteoblastic proliferation. METHODS: Cytosolic Ca(2+) concentration ([Ca(2+)]c) of primary cultured rat osteoblasts was detected by fluorescence imaging using calcium-sensitive probe fura-2/AM. Osteoblastic proliferation was estimated by cell counting, MTS assay and ATP assay. Agonists and antagonists of calcium-sensing receptors (CaSR) as well as inhibitors of phospholipase C (PLC), SOCE and voltage-gated calcium (Cav) channels were applied to study the mechanism in detail. RESULTS: Our data showed that elevating [Ca(2+)]o evoked a sustained increase of [Ca(2+)]c in a dose-dependent manner. This [Ca(2+)]c increase was blocked by TMB-8 (Ca(2+) release inhibitor), 2-APB and BTP-2 (both SOCE blockers), respectively, whereas not affected by Cav channels blockers nifedipine and verapamil. Furthermore, NPS2143 (a CaSR antagonist) or U73122 (a PLC inhibitor) strongly reduced the [Ca(2+)]o-induced [Ca(2+)]c increase. The similar responses were observed when cells were stimulated with CaSR agonist spermine. These data indicated that elevating [Ca(2+)]o resulted in SOCE depending on the activation of CaSR and PLC in osteoblasts. In addition, high [Ca(2+)]o significantly promoted osteoblastic proliferation, which was notably reversed by BAPTA-AM (an intracellular calcium chelator), 2-APB, BTP-2, TMB-8, NPS2143 and U73122, respectively, but not affected by Cav channels antagonists. CONCLUSIONS: Elevating [Ca(2+)]o induced SOCE by triggering the activation of CaSR and PLC. This process was involved in osteoblastic proliferation induced by high level of extracellular Ca(2+) concentration.

pubPublic Library of Science (PLoS)
doi10.1371/journal.pone.0107217
urlhttps://doaj.org/article/c38a54fd9c22431bbee96d33809bb60b
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pagese107217
date2014-09-25