首页> 外文期刊>Regulatory peptides. >Neuro-hormonal control of bone metabolism: vasoactive intestinal peptide stimulates alkaline phosphatase activity and mRNA expression in mouse calvarial osteoblasts as well as calcium accumulation mineralized bone nodules.
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Neuro-hormonal control of bone metabolism: vasoactive intestinal peptide stimulates alkaline phosphatase activity and mRNA expression in mouse calvarial osteoblasts as well as calcium accumulation mineralized bone nodules.

机译:骨骼代谢的神经激素控制:血管活性肠肽刺激小鼠颅骨成骨细胞以及钙积累矿化的骨结节中碱性磷酸酶活性和mRNA表达。

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Based upon the immunohistochemical demonstration of neuropeptides in the skeleton, including vasoactive intestinal peptide (VIP), we have addressed the question of whether neuropeptides may exert regulatory roles on bone tissue metabolism or not. In the present communication, we have investigated if VIP can affect anabolic processes in osteoblasts. Osteoblasts were isolated from neonatal mouse calvariae by time sequential enzyme-digestion and subsequently cultured for 2-28 days in the presence of VIP and other modulators of cyclic AMP formation. VIP (10(-6) M) stimulated ALP activity and calcium content. The cyclic AMP phosphodiesterase inhibitors ZK 62 711 (10(-4) M) and isobutyl-methylxanthine (10(-4) M) stimulated ALP activity and synergistically potentiated the effect of VIP. Neither VIP, nor isobutyl-methylxanthine or ZK 62 711, in the absence or presence of VIP, affected cell number. The stimulatory effect of VIP on ALP activity, in the presence of ZK 62 711, was dependent on time and concentration of VIP. The stimulatory effects of VIP and ZK 62 711 on ALP activity was seen also in cells stained for ALP. VIP (10(-6) M), in the presence of ZK 62 711 (10(-6) M), significantly enhanced mRNA for tissue non-specific ALP. VIP (10(-6) M), in the presence of ZK 62 711, stimulated cyclic AMP production. Forskolin and choleratoxin stimulated ALP activity and cyclic AMP formation in a concentration-dependent manner, without affecting cell number. VIP (10(-6) M) and ZK 62 711 (10(-5) M) stimulated, and their combination synergistically enhanced, calcium content in bone noduli. These data show that VIP, without affecting cell proliferation, can stimulate osteoblastic ALP biosynthesis and bone noduli formation by a mechanism mediated by cyclic AMP. Our observations suggest a possibility that anabolic processes in bone are under neurohormonal control.
机译:基于骨骼中神经肽(包括血管活性肠肽(VIP))的免疫组织化学显示,我们已经解决了神经肽是否可能对骨骼组织代谢发挥调节作用的问题。在本通讯中,我们研究了VIP是否会影响成骨细胞的合成代谢过程。通过时间顺序酶消化从新生小鼠颅骨中分离成​​骨细胞,随后在VIP和其他环状AMP形成调节剂的存在下培养2-28天。 VIP(10(-6)M)刺激了ALP活性和钙含量。环状AMP磷酸二酯酶抑制剂ZK 62 711(10(-4)M)和异丁基甲基黄嘌呤(10(-4)M)刺激ALP活性并协同增强VIP的作用。在不存在或存在VIP的情况下,VIP或异丁基甲基黄嘌呤或ZK 62 711都不会影响细胞数。 ZK 62 711存在时VIP对ALP活性的刺激作用取决于VIP的时间和浓度。在ALP染色的细胞中也观察到了VIP和ZK 62 711对ALP活性的刺激作用。在ZK 62711(10(-6)M)存在的情况下,VIP(10(-6)M)显着增强了组织非特异性ALP的mRNA。在ZK 62711存在下,VIP(10(-6)M)刺激了环AMP的产生。福司可林和胆碱毒素以浓度依赖性方式刺激ALP活性和环状AMP的形成,而不影响细胞数量。 VIP(10(-6)M)和ZK 62 711(10(-5)M)刺激了它们的结节中的钙含量,并且它们的组合协同增强了钙含量。这些数据表明,VIP在不影响细胞增殖的情况下,可以通过环AMP介导的机制刺激成骨细胞ALP的生物合成和结节形成。我们的观察结果表明骨骼中的合成代谢过程处于神经激素控制之下的可能性。

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