Prostaglandin E2 activates outwardly rectifying Cl(-) channels via a cAMP-dependent pathway and reduces cell motility in rat osteoclasts.
Prostaglandin E2 activates outwardly rectifying Cl(-) channels via a cAMP-dependent pathway and reduces cell motility in rat osteoclasts.
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前列腺素 E2 通过 cAMP 依赖性途径激活外向整流 Cl(-) 通道,并降低大鼠破骨细胞的细胞运动性。
DOI:
10.1152/ajpcell.00551.2003
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发表时间:
2004
期刊:
影响因子:
--
通讯作者:
K. Okabe
中科院分区:
文献类型:
--
作者:
F. Okamoto;H. Kajiya;H. Fukushima;E. Jimi;K. Okabe
We examined changes in electrical and morphological properties of rat osteoclasts in response to prostaglandin (PG)E(2). PGE(2) (>10 nM) stimulated an outwardly rectifying Cl(-) current in a concentration-dependent manner and caused a long-lasting depolarization of cell membrane. This PGE(2)-induced Cl(-) current was reversibly inhibited by 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid (DIDS), 5-nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB), and tamoxifen. The anion permeability sequence of this current was I(-) > Br(-) approximately Cl(-) > gluconate(-). When outwardly rectifying Cl(-) current was induced by hyposmotic extracellular solution, no further stimulatory effect of PGE(2) was seen. Forskolin and dibutyryl adenosine 3',5'-cyclic monophosphate (DBcAMP) mimicked the effect of PGE(2). The PGE(2)-induced Cl(-) current was inhibited by pretreatment with guanosine 5'-O-2-(thiodiphosphate) (GDPbetaS), Rp-adenosine 3',5'-cyclic monophosphorothioate (Rp-cAMPS), N-(2-[p-bromocinnamylamino]ethyl)-5-isoquinolinesulfonamide dihydrochloride (H-89), and protein kinase A inhibitors. Even in the absence of nonosteoclastic cells, PGE(2) (1 microM) reduced cell surface area and suppressed motility of osteoclasts, and these effects were abolished by Rp-cAMPS or H-89. PGE(2) is known to exert its effects through four subtypes of PGE receptors (EP1-EP4). EP2 and EP4 agonists (ONO-AE1-259 and ONO-AE1-329, respectively), but not EP1 and EP3 agonists (ONO-DI-004 and ONO-AE-248, respectively), mimicked the electrical and morphological actions of PGE(2) on osteoclasts. Our results show that PGE(2) stimulates rat osteoclast Cl(-) current by activation of a cAMP-dependent pathway through EP2 and, to a lesser degree, EP4 receptors and reduces osteoclast motility. This effect is likely to reduce bone resorption.
影响因子:
56.9
作者:
BLAIR, HC;TEITELBAUM, SL;GLUCK, S
通讯作者:
GLUCK, S
影响因子:
4.8
作者:
Klein-Nulend,J;Raisz,LG
通讯作者:
Raisz,LG
DOI:
10.1152/ajpcell.1996.271.1.c112
发表时间:
1996
期刊:
The American journal of physiology.
影响因子:
--
作者:
Meng,XJ;Weinman,SA
通讯作者:
Weinman,SA