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能预测肺病存活率的蛋白质

By LabMedica International staff writers
Posted on 29 Feb 2012
血液中的一组蛋白质能预测哪些特发性肺纤维化(IPF)患者更可能在两年内死亡,哪些人又能活至少五年。

这些通过不同方法发现的血浆生物标记物能帮助医生确定哪些患者急需肺移植,而哪些患者可以稍等一段时间。

美国宾夕法尼亚州匹兹堡大学(PA, USA; www.pitt.edu)的科学家分析了241名IPF患者的92种蛋白质的浓度。他们用人类DiscoveryMAP系统(Rules-Based Medicine, Austin, TX, USA; www.rulesbasedmedicine.com)分析了92个细胞因子与化学趋化因子、基质金属蛋白酶(MMP)和凋亡标记物的浓度以及上皮损伤。

研究人员用多重微粒免疫测定估计了(MMP) MMP7和MMP1的浓度。用酶联免疫吸附测定(ELISA)评估了表面活性物质相关蛋白D (SPD)的水平。在有效组,用基于微粒的多重测定评估了细胞间粘附分子1 (ICAM1)、白细胞介素-8 (IL8)和血管细胞粘附蛋白1 (VCAM1)的浓度,又用ELISA评估了钙结合蛋白S100A12和MMP7。

高浓度的MMP7、ICAM1、IL8、VCAM1和S100A12预示了衍生组的总体存活率不良、无移植存活率不良以及无进展存活率不良。在独立有效组,所有上述五种标记物的高浓度能预测无移植存活率不良,MMP7、ICAM1和IL8能预测总体存活率,ICAM1可预测无进展存活率不良。基于这两组结果,研究小组开发了个人临床与分子死亡率预测指数(PCMI),其中包括肺功能、性别以及血液中的MMP7水平。他们发现,PCMI水平低的人最有可能活五年以上,然而,PCMI水平高的人存活期的中值是36个月。用R&D系统公司(Minneapolis, MN, USA; www.rndsystems.com)生产的ELISA测量了MMP7、MMP1和SPD的血浆浓度。用于测量S100A12的ELISA是MBL国际公司(Woburn, MA, USA; www.mblintl.com)的产品。

该研究的论文发表于2011年10月27日的《美国呼吸病与重症监护医学杂志》(American Journal of Respiratory and Critical Care Medicine)。资深作者、医学教授Naftali Kaminski大夫说:“仅凭症状很难判断哪些患者处于极度危险中。这组生物标记物的预测能力能引导我们的治疗计划。它也许还能帮助我们设计更有效的研究实验,因为我们将能更好地把实验性疗法应用于最合适的病人。”

Related Links:
University of Pittsburgh >>> www.pitt.edu
Rules-Based Medicine >>> www.rulesbasedmedicine.com
R&D Systems >>> www.rndsystems.com
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