脑缺氧对通气功能的影响

缺氧对通气功能的影响取决于缺氧的严重程度,且与缺氧的部位有关。大量的研究资料表明,中枢缺氧一般对通气功能起抑制作用。①去外周神经研究:最早于清醒猫实验发现,若将其颈动脉体神经去除,中枢缺氧引起通气减低。其它麻醉动物去神经后实验     

钾通道阻滞剂对大鼠支气管平滑肌细胞增殖的影响

目的探讨电压依赖性延迟整流钾通道(K_V)、Ca²⁺激活钾通道(K_Ca)和ATP敏感性钾通道(K_ATP)对大鼠支气管平滑肌细胞(BSMC)增殖的影响。 方法应用免疫细胞化学、MTT微量比色分析法及流式细胞术,观察K_V,K_Ca和K_ATP对培养中大鼠BSMC增殖的影响。结果K_V阻断剂4-氨基吡啶(4-AP)显著促进大鼠BSMC增殖细胞核抗原的表达,提高BSMC吸光度值,使S+G₂M期细胞数显著增多,并显著提高基础状态下BSMC内Ca²⁺浓度,而K_Ca阻断剂四乙铵(TEA)和K_ATP阻断剂格列本脲(Glib)均无此效应。 结论大鼠BSMC K_V活性的抑制,可提高细胞内Ca²⁺浓度,促进细胞的增殖,而K_Ca和K_ATP对BSMC的增殖均无明显影响。     

肺炎衣原体和汉坦病毒——新的肺炎病原体

近年来关于肺炎的病原学研究取得了一些进展,认识了一些新的病原体,本文重点介绍其中的肺炎衣原体和汉坦病毒(Hantavirus)。肺炎衣原体感染 微生物学 衣原体属是一组细胞内寄生的微生物,目前认为它包括沙眼衣原体、鹦鹉热衣原体和肺炎衣原体3种,其各自的特性见表1。3种衣原体均可在人类导致肺炎。     

参麦注射液与氨茶碱对膈肌细胞Ca2+浓度的影响

目的 :探讨参麦注射液与氨茶碱对膈肌细胞内游离Ca2 浓度的影响。方法 :体外培养大鼠膈肌细胞 ,荧光光度法测定参麦注射液与氨茶碱处理前后细胞内Ca2 浓度的变化。结果 :氨茶碱可使膈肌细胞内的Ca2 浓度明显升高(P<0.01) ,维拉帕米或预先去除培养液中Ca2 可消除该作用。参麦注射液对膈肌细胞内Ca2 浓度无明显影响(P>0.05)。缺氧24h即可致膈肌细胞内Ca2 浓度明显升高(P<0.01) ,参麦注射液对缺氧24h所致的膈肌细胞内Ca2 浓度升高有抑制作用。结论 :细胞外Ca2 是氨茶碱导致细胞内Ca2 升高的关键因素 ,氨茶碱可通过促进细胞外Ca2 内流导致细胞内Ca2 升高。参麦注射液可抑制缺氧所致的膈肌细胞内Ca2 超载 ,对细胞有一定的保护作用。以上作用分别参与了二者抗膈肌疲劳的机制     

咳嗽-肺炎-咳嗽变异型哮喘

患者男，18岁，湖北人，学生。因“反复咳嗽、咳痰3个月”入院。     

The Effect of Erigeron Breviscapus on Proliferation of Pulmonary Artery Smooth Muscle Cells in Hypoxic Porcines

Erigeron breviscapus can relax microarteries,improve microcirculation,increase tissue bloodstream,enhance heart function and decrease bloodviscosity.Presently,good curative effects on is-chemia has been achieved,but few studies have beenconducted on the treatment of hypoxic pulmonaryhypertension( HPH) .In this study,MTT and ex-pression of PCNA was used to examine the prolifera-tion of PASMC and investigate the mechanism of ef-fectof EB on HPH.1　 MATERIALSAND METHODS1 .1　 Cult…     

以PD20-PEF和PD20-FEV1作为气道反应性判定指标的比较分析

为探讨以PD20-PEF替代PD20-FEV1作为气道反应性判定指标的可行性,对64例有呼吸系统症状者和62例无症状者进行乙酰甲胆碱支气管激发试验,同步记录PEF和FEV1,计算PD20-PEF和PD20-FEV1。虽然PD20-PEF和PD20-FEV1之间有较强的直线相关关系(P<0.001),但两者之间有显著差异(P<0.005);若以PD20-FEV1作为金标准,在有症状组中以PD20-PEF作为气道反应性判定指标的敏感性(72.7%)、特异性(73.8%)、阳性符合率(59.3%)、阴性符合率(83.8%)均不甚高;在无症状组中敏感性(66.7%)和阳性符合率(40.0%)仍低,而特异性(89.2%)和阳性符合率(96.2%)较高。认为PD20-PEF作为无症状群体的流行病学筛选指标以除外气道反应性正常者可能具有一定价值,但替代PD20-FEV1作为气道反应性指标用于临床工作则欠妥当。     

Primary Culture of Alveolar Epithelial Type Ⅱ Cells and Its Bionomic Study

To establish a better method of primary culture for alveolar epithelial type Ⅱ cells (AEC Ⅱ) and to study its bionomics, alveolar epithelial type Ⅱ cells were isolated by digestion with tryp- sin and collagenase, which were then purified by plated into culture flask coated with rat immu- noglobulin G. The purified AEC Ⅱ were identified by alkaline phosphatase staining, electron mi- croscopy, immunocytochemical staining of pulmonary surfactant protein A (SPA). The SPA expres- sion and transfection characteristics were compared with those of A549 cell line. The results showed that AEC Ⅱ could be isolated by digestion with trysin and collagenase and purified by adhesive pu- rification by using IgG, with a yield of about 2–3×107, and a purity of about 75%–84 %. Cells could be quickly identified with AKP staining. AECⅡ were different from A549 cell line in terms of SPA expression and transfection characteristics. It is concluded that adhesive purification with IgG can improve the purity of AECⅡ, and AKP staining is simple in cell identification. AECⅡ can not be completely replaced by A549 cells in some studies because the differences between them, such as SPA expression.     

Increased Expression of PI-3K in Asthmatic Rat T Lymphocytes

In order to explore the expression of PI-3K in T lymphocytes of asthmatic rats and the relationship between PI-3K and activation of T lymphocytes, 24 Wistar rats were randomly divided into 4 groups: normal control group, asthmatic one-week group, asthmatic two-week group and asth-matic four-week group. T cells were purified from blood of each rat and the expression of PI-3K was observed by immunocytochemical fluorescence staining, the semiquantitative fluorescence intensity was measured by HPIAS-2000 analytic software, and the expression of IL-4 in supernatants was de-tected by ELISA. The results showed that the fluorescence intensity of T lymphocytes in asthmatic groups was significantly higher than that in normal control (P<0.001), indicating that the expression of PI-3K in T lymphocytes of asthmatic rats was significantly higher than that in those of normal controls, and the difference between acute and chronic stage asthmatic groups was significant (P<0.05). The expression levels of IL-4 protein in supernatants of asthmatic T lymphocytes were sig-nificantly higher than those in the normal controls (P<0.05). There was a significant positive correla-tion between the expression of PI-3K in T lymphocytes and the IL-4 protein expression in super-natants (r=0.583, P<0.01). It was suggested that PI-3K signal pathway may participate in the proc-esses of activation and other cytological effects of asthmatic T lymphocytes, thus may play an impor-tant roles in the pathogenesis of asthma.