Respiratory muscle function and hypoxic ventilatory control in patients with type I diabetes.

STUDY OBJECTIVES: The interaction among pulmonary mechanics, respiratory muscle performance, and ventilatory control in subjects with insulin-dependent diabetes mellitus has so far received little attention. We therefore decided to assess the role of central factors and peripheral factors on the ventilatory response to a hypoxic stimulus in type I diabetic patients. SUBJECTS: Eight patients in stable condition aged 19 to 48 years old, with insulin-dependent diabetes mellitus (duration of the disease, 36 to 240 months) and no history of smoking, cardiopulmonary involvement, or autonomic neuropathy; and an age- and gender-matched control group. MEASUREMENTS: In each patient, we measured the following: pulmonary volumes; diffusing capacity of the lung for carbon monoxide (D(LCO)); time and volume components of ventilation (tidal volume [V(T)] and respiratory frequency); static compliance (Clstat) and dynamic compliance (Cldyn); swings in pleural pressure (Pes) and gastric pressure (Pg); and transdiaphragmatic pressure (Pdi), obtained by subtracting Pes from Pg. Maximal inspiratory Pes and Pdi during a maximal sniff maneuver were also measured. Swings in Pes and Pdi during V(T) as a percentage of Pes and Pdi during the maximal sniff maneuver [Pessw(%Pessn) and Pdisw(%Pdisn), respectively] were both considered as a measure of central respiratory output, and the Pessw(%Pessn)/V(T) ratio was considered as an index of neuroventilatory dissociation (NVD) of the inspiratory pump. Subjects were studied at baseline and during hypoxic rebreathing. RESULTS: Pulmonary volumes and D(LCO) were normal or slightly reduced. A lower Cldyn, higher central respiratory output, and NVD were found. During hypoxic rebreathing, patients had lower V(T), similar central respiratory output, and greater NVD per unit change in arterial oxygen saturation compared with values in control subjects. An increase in dynamic elastance, computed as 1/Cldyn, during hypoxia was found in patients, but not in normal subjects, and was directly related to concurrent changes in NVD. CONCLUSIONS: We have shown that the assessment of a normal Clstat and normal routine parameters of airway obstruction does not permit the definite exclusion of the role of peripheral airway involvement in insulin-dependent diabetes mellitus. Peripheral airway involvement is likely to influence indices of hypoxic ventilator) drive by modulating a normal central motor output into a rapid and shallow pattern of ventilatory response.     

miR-210与缺血性脑卒中

脑卒中是神经系统的常见病，其中以缺血性脑卒中更为高发。MicroRNA（miRNA）作为非侵入性生物标志物，在调节细胞因子等诸多方面参与生物学调控过程^[1]。而miR-210作为其中一类，具有高度缺氧特异性。缺血性脑卒中发生后，脑组织呈缺血、缺氧状态。而大量研究表明，miR-210的表达在缺氧环境下最为显著。本文将探讨在调控缺血性脑卒中过程中，miR-210在细胞应答反应、血管新生与神经功能等各方面所发挥的效应及作用。     

红景天苷通过miRNA-210-3p/E2F3抑制非小细胞肺癌细胞的增殖和迁移

目的:探讨红景天苷（salidroside，Sal）通过miRNA-210-3p/E2F3对非小细胞肺癌（non-small cell lung cancer，NSCLC）细胞增殖和迁移的影响及作用机制。方法:通过生物信息网站分析miR-210-3p及其靶基因在肺腺癌组织和正常组织中的表达及生存影响。采用免疫组化法检测肺腺癌组织和正常组织中E2F3蛋白的表达；qRT-PCR检测NSCLC细胞中miR-210-3p和E2F3基因表达；Western blot检测NSCLC细胞中E2F3蛋白表达；CCK-8、细胞划痕及克隆形成实验分别检测红景天苷和miR-210-3p对NSCLC细胞增殖、迁移及克隆形成的影响。结果:生物信息网站显示miR-210-3p和E2F3在肺腺癌组织中高表达，且与不良预后相关。Sal以时间-浓度依赖抑制NSCLC细胞的增殖活性（P＜0.05），并显著降低NSCLC细胞的迁移及克隆形成能力（P＜0.05），而低浓度Sal对正常肺上皮细胞的增殖无明显抑制效果。miRNA-210-3p和E2F3表达在NSCLC细胞中上调（P＜0.05），Sal可抑制二者表达（P＜0.05）。与对照组比较，miR-210-3p inhibitor组E2F3表达上调（P＜0.05），miR-210-3p mimics组E2F3表达被抑制（P＜0.05），Sal与miR-210-3p mimics联用进一步抑制了miR-210-3p mimics所致的E2F3表达下调和细胞增殖和迁移的增强作用（P＜0.05）。结论:miR-210-3p和E2F3在肺腺癌中高表达，Sal可通过时间-浓度依赖负调控miRNA-210-3p/E2F3影响 NSCLC细胞的生物学行为，发挥抗癌作用。