首页> 外文期刊>Cellular Oncology: Analytical Cellular Pathology >Silica Induces Changes in Cytosolic Free Calcium, Cytosolic pH, and Plasma Membrane Potential in Bovine Alveolar Macrophages
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Silica Induces Changes in Cytosolic Free Calcium, Cytosolic pH, and Plasma Membrane Potential in Bovine Alveolar Macrophages

机译:二氧化硅诱导牛肺泡巨噬细胞中胞质游离钙,胞质pH和血浆膜电位的变化

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The mineral‐dust induced activation of pulmonary phagocytes is thought to be involved in the induction of severe lung diseases. The activation of bovine alveolar macrophages (BAM) by silica was investigated by flow cytometry. Short‐term incubation (10 min) of BAM with silica gel and quartz dust particles induced increases in the cytosolic free calcium concentration ([Ca2+]i), decreases in intracellular pH (pHi), and increases in plasma membrane potential (PMP). The extent of these changes was concentration dependent, related to the type of dust and was due to Ca2+influx from the extracellular medium. An increase in [Ca2+]iwas inhibited, when extracellular Ca2+was removed. Furthermore the calcium signal was quenched by Mn2+and diminished by the calcium channel blocker verapamil. The protein kinase C specific inhibitor bisindolylmaleimide II (GF 109203 X) did not inhibit the silica‐induced [Ca2+]irise. In contrast, silica‐induced cytosolic acidification and depolarization were inhibited by GF 109203 X but not by removal of extracellular calcium. Addition of TiO2particles or heavy metal‐containing dusts had no effect on any of the three parameters. Our data suggest the existence of silica‐activated transmembrane ion exchange mechanisms in BAM, which might be involved in the specific cytotoxicity of silica by Ca2+‐dependent and independent pathways.
机译:矿物质粉尘诱导的肺吞噬细胞活化被认为与严重肺部疾病的诱发有关。通过流式细胞术研究了牛对肺泡巨噬细胞(BAM)的活化作用。 BAM与硅胶和石英尘粒的短期温育(10分钟)导致胞质游离钙浓度([Ca2 +] i)升高,细胞内pH(pHi)降低和质膜电位(PMP)升高。这些变化的程度与浓度有关,与粉尘的类型有关,并且归因于来自细胞外介质的Ca2 +流入。当去除细胞外Ca 2+时,[Ca 2+] i的增加被抑制。此外,钙信号被Mn2 +淬灭,并被钙通道阻滞剂维拉帕米减弱。蛋白激酶C特异性抑制剂bisindolylmaleimide II(GF 109203 X)不抑制二氧化硅诱导的[Ca2 +] irise。相比之下,GF 109203 X抑制了二氧化硅诱导的胞质酸化和去极化,而去除细胞外钙则没有。 TiO2颗粒或含重金属的粉尘的添加对这三个参数均没有影响。我们的数据表明BAM中存在二氧化硅激活的跨膜离子交换机制,这可能与Ca2 +依赖性和独立途径有关,从而对二氧化硅产生了特定的细胞毒性。

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