Home
Resources
Publications
BAPTA-AM, an Intracellular Calcium Chelator, Inhibits RANKL-induced Bone Marrow Macrophages Differentiation Through MEK/ERK, p38 MAPK and Akt, but Not JNK Pathways

BAPTA-AM, an Intracellular Calcium Chelator, Inhibits RANKL-induced Bone Marrow Macrophages Differentiation Through MEK/ERK, p38 MAPK and Akt, but Not JNK Pathways

Sigui Zhou, Xi Yuan, Qinghua Liu, Xiaoqi Zhang, Xuediao Pan, Linquan Zang, Lipeng Xu

Cytokine. 2010 Dec;52(3):210-4.

PMID: 20667748

Abstract:

To examine the roles of intracellular calcium in RANKL-induced bone marrow macrophages (BMMs) differentiation, the effects of intracellular calcium chelator BAPTA-AM on RANKL-induced BMMs differentiation, and the activation of its relating signal proteins (MAPKs, and the PI3K/Akt) were studied. BMMs were cultured with various concentrations of BAPTA-AM in the presence of M-CSF (25 ng/ml) and RANKL (25 ng/ml) for 7 days, osteoclastogenic ability, cytosolic free Ca(2+) concentration, osteoclast survival and the expression of phosphorylated ERK1/2, SAPK/JNK, Akt and p38 MAPK were measured by TRAP staining, spectrofluorometer and Western blotting. BAPTA-AM inhibited osteoclastogenesis and osteoclast survival of BMMs by RANKL induction. In osteoclasts without the pretreatment of BAPTA-AM, the increased response of [Ca(2+)](i) was observed within 15 min and the maximum was about 1.2 times that of control. This response was sustained for 30 min and returned to the control level at 1h after RANKL-inducing, and the increased response of [Ca(2+)](i) was completely abolished and sustained to at least 8h by BAPTA-AM. Although immunoblotting data revealed that RANKL could activate the phosphorylation of ERK1/2, SAPK/JNK, Akt and p38 MAPK, the expression of ERK1/2, Akt and p38 MAPK phosphorylation was inhibited by BAPTA-AM dose-dependently. These results revealed that BAPTA-AM inhibit osteoclastogenic ability of BMMs via suppressing the increase of [Ca(2+)](i) which lead to inhibit RANKL-induced the phosphorylation of ERK, Akt and p38 MAPK, but not JNK. This finding may be useful in the development of an osteoclastic inhibitor that targets intracellular signaling factors.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP126150978-B	BAPTA-AM		126150-97-8	Price

As a specialist in analytical chemical Products, Alfa Chemistry offers consumers a wealth of raw materials and a full range of technologies and services.

QUICK LINKS

HEADQUARTERS

Tel:

Fax:

Email: