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The sphingosine 1-phosphate receptor 5 and sphingosine kinases 1 and 2 are localised in centrosomes: Possible role in regulating cell division

机译:1-磷酸鞘氨醇受体5和鞘氨醇激酶1和2位于中心体中:在调节细胞分裂中的可能作用

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We show here that the endogenous sphingosine 1-phosphate 5 receptor (S1P(5), a G protein coupled receptor (GPCR) whose natural ligand is sphingosine 1-phosphate (S1P)) and sphingosine kinases 1 and 2 (SK1 and SK2), which catalyse formation of SIP, are co-localised in the centrosome of mammalian cells, where they may participate in regulating mitosis. The centrosome is a site for active GTP-GDP cycling involving the G-protein, G(i) and tubulin, which are required for spindle pole organization and force generation during cell division. Therefore, the presence of S1P(5) (which normally functions as a plasma membrane guanine nucleotide exchange factor, GEF) and sphingosine kinases in the centrosome might suggest that S1P(5) may function as a ligand activated GEF in regulating G-protein-dependent spindle formation and mitosis. The addition of SIP to cells inhibits trafficking of S1P(5) to the centrosome, suggesting a dynamic shuttling endocytic mechanism controlled by ligand occupancy of cell surface receptor. We therefore propose that the centrosomal S1P(5) receptor might function as an intracellular target of SIP linked to regulation of mitosis.
机译:我们在这里显示了内源性鞘氨醇1-磷酸5受体(S1P(5),G蛋白偶联受体(GPCR),其天然配体是鞘氨醇1-磷酸(S1P))和鞘氨醇激酶1和2(SK1和SK2),催化SIP形成的蛋白共定位在哺乳动物细胞的中心体中,它们可能参与调节有丝分裂。中心体是活跃的GTP-GDP循环的站点,涉及G蛋白,G(i)和微管蛋白,这是纺锤极组织和细胞分裂过程中产生力所必需的。因此,在中心体中存在S1P(5)(通常起质膜鸟嘌呤核苷酸交换因子GEF的作用)和鞘氨醇激酶的存在可能表明S1P(5)可能起配体激活的GEF的作用来调节G蛋白-依赖纺锤体形成和有丝分裂。 SIP添加到细胞抑制S1P(5)向中心体的运输,表明动态穿梭内吞机制受细胞表面受体的配体占据控制。因此,我们建议中心体S1P(5)受体可能充当SIP的细胞内靶标,与有丝分裂的调控有关。

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