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:
American journal of physiology. Cell physiology
影响因子:
--
通讯作者:
K. Okabe
K. Okabe
中科院分区:
--
文献类型:
--
作者:
F. Okamoto;H. Kajiya;H. Fukushima;E. Jimi;K. Okabe

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我们检测了大鼠破骨细胞对前列腺素E(PG)的电特性和形态学特性的变化(2)。PGE(2)(>10 nM)以浓度依赖性方式刺激外向整流Cl(-)电流,引起细胞膜长时间去极化。PGE(2)诱导的Cl(-)电流可被4,4 '-二异硫氰基二苯乙烯-2,2'-二磺酸(DIDS)、5-硝基-2-(3-苯丙氨基)-苯甲酸(NPPB)和他莫昔芬可逆地抑制。该电流的阴离子渗透性顺序为I(-)> Br(-),Cl(-)>葡萄糖酸盐(-)。当低渗细胞外液诱发外向整流性Cl(-)电流时,未见PGE(2)的进一步刺激作用。毛喉素和二丁酰腺苷3 ',5'-环一磷酸(DBcAMP)模拟了PGE的作用(2)。用鸟苷5 '-O-2-(硫代二磷酸)(GDP β S)、Rp-腺苷3',5 '-环单硫代磷酸(Rp-cAMPS)、N-(2-[p-溴肉桂氨基]乙基)-5-异喹啉磺酰胺二盐酸盐(H-89)和蛋白激酶A抑制剂预处理可抑制PGE(2)诱导的Cl(-)电流。即使在非骨细胞的情况下,PGE(2)(1 μ M)减少细胞表面积和抑制破骨细胞的运动,这些作用被Rp-cAMPS或H-89消除。已知PGE(2)通过PGE受体的四种亚型(EP 1-EP 4)发挥其作用。EP 2和EP 4激动剂(分别为ONO-AE 1 -259和ONO-AE 1 -329),但EP 1和EP 3激动剂(分别为ONO-DI-004和ONO-AE-248),模拟了PGE(2)对破骨细胞的电和形态学作用。我们的研究结果表明,PGE(2)通过激活cAMP依赖性途径刺激大鼠破骨细胞Cl(-)电流,该途径通过EP 2受体,在较小程度上,EP 4受体,并降低破骨细胞的运动性。这种作用可能会减少骨吸收。
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.
DOI: 10.1126/science.2528207
发表时间: 1989-08-25
期刊: SCIENCE
影响因子: 56.9
作者:
BLAIR, HC;TEITELBAUM, SL;GLUCK, S
通讯作者: GLUCK, S
两种阴离子转运抑制剂对器官培养骨吸收的影响。
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发表时间: 1989
期刊: Endocrinology
影响因子: 4.8
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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:
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