The effect of arachidonic acid on the M current of NG108-15 neuroblastoma × glioma hybrid cells

The M current, I _M, a voltage-dependent non-inactivating K⁺ current, was recorded in NG108-15 neuroblastoma × glioma hybrid cells, using the whole-cell mode of the patch-clamp technique. We studied the effect of arachidonic acid, other fatty acids and inhibitors of the arachidonic acid metabolism. In relatively high concentrations (25–50 M) arachidonic acid first increased and later decreased the current, I _h, which holds the membrane potential at –30 mV and mainly flows through open M channels. It shifted the midpoint potential, V _o, of the relation between M conductance, g _M, and membrane potential, V, to more negative values and decreased the maximum conductance ¯g _M and the time constant _M. In smaller concentrations (5–10 M) arachidonic acid merely decreased I _h and ¯g _M with little effect on V _o and _M. Eicosatetraynoic acid and docosa-hexaenoic acid acted similarly to arachidonic acid whereas stearic acid had no effect. Of the three enzyme inhibitors studied, nordihydroguaiaretic acid acted similarly to arachidonic acid. i. e. caused a biphasic change in I _h. Indomethacin and quinacrine caused, respectively, a pure increase and a pure decrease of I _h and ¯g _M. Possible explanations are build-up of internally produced arachidonic acid, depletion of eicosanoid products or an inhibitory effect unrelated to arachidonic acid metabolism.     

A contribution to a new test method for dandruff-inhibiting and “keratolytic” action of drugs

Summary Free cholesterol in lipids from the scalp and hair is predominantly a constituent of epidermal lipids. Therefore, a reduction in cholesterol content induced by a drug indicates a reduction in cell turnover in the epidermis. As, according to the literature, increased cell turnover in the epidermis results in formation of dandruff, a reduction in the proportion of cholesterol should indicate inhibition of the formation of dandruff. Conversely, an increase in free cholesterol should generally indicate a keratolytic effect. So unequivocal an interpretation has not so far been possible in persons with dandruff, as it was not known whether free cholesterol was increased or decreased. In addition, this interpretation was not possible after use of antimicrobial substances, as in vitro investigations had failed to exclude microbial esterification of cholesterol on the scalp. The present investigation has shown that correlation of free cholesterol level with cell turnover is permissible in patients with dandruff, even if antimicrobial drugs are being tested.     

神农心脑康胶囊的研制及临床应用

目的：研究神农心脑康胶囊的制备和质量标准，观察临床治疗冠心病心绞痛的治疗效果。方法：用薄层色谱鉴别麝香、银杏、川芎、淫羊藿的成分，单盲临床观察40例冠心病心绞痛的患者并确定其临床治疗冠心病心绞痛的疗效标准。结果：薄层扫描法可用于鉴别其主药；经临床观察冠心病心绞痛患者，其总有效率达87．5％。结论：制备工艺合理，所得制剂质量可控，治疗冠心病心绞痛疗效显著，且无任何不良反应。     

骨疏灵胶囊的质量标准研究

目的：研究骨疏灵胶囊的质量控制标准。方法：采用薄层色谱法对制剂中的补骨脂、女贞子进行定性鉴别；并利用高效液相色谱法对制剂中的淫羊藿苷进行定量分析，以CH3CN-H2O(30：70)为流动相，流速1．0mL／min，色谱柱为C18柱，检测波长为270nm。结果：补骨脂与女贞子的薄层色谱鉴别专属性强，阴性对照无干扰；淫羊藿苷在0.0968～0.4840μgg范围内线性关系良好(r=0．9999)，平均回收率为97．27％(RSD=1．88％，n=5)。结论：该方法可为骨疏灵胶囊的质量评价提供科学依据。     

Medulloblastoma in an adult suggestive of external granule cells as its origin: A histological and immunohistochemical study

We describe a rare case of medulloblastoma in an adult woman with histological findings suggesting an origin for this neoplasm in the external granular layer or its remnants. The patient presented with cerebellar dysfunction, and neuroimaging revealed a right cerebellar mass lesion. Pathological examination of the operative specimen revealed a medulloblastoma with occasional areas of neuronal or glial differentiation. Zic protein was also detected immunohistochemically in the tumor cells. The tumor cells were mainly distributed in the subarachnoid space and extended to the cerebellar parenchyma through the perivascular space to form tumor nodules. A suggestive finding, as concerns the origin of this neoplasm, was that the tumor cells were also spread evenly along the subpial zone of the molecular layer, reminiscent of the cellular architecture of the fetal external granular layer.     

重组人白细胞介素-11对小鼠尾部表皮颗粒层形成和血清白细胞介素-2水平的影响

目的观察重组人白细胞介素-11(rhIL-11)对小鼠尾部表皮颗粒层生成和血清白细胞介素-2(IL-2)水平的影响。方法采用小鼠尾部鳞片表皮颗粒层形成模型,不同组别的小鼠给予rhIL-11或甲氨喋呤,观察其对鼠尾鳞片表皮颗粒层和血清IL-2含量的影响。结果rhIL-11可显著促进小鼠尾部鳞片表皮颗粒层形成(P<0.01),并显著抑制血清IL-2的水平(P<0.01)。结论rhIL-11可抑制角质细胞增殖分化不全和减少促发因子IL-2的生成,对银屑病具有较好的防治作用。     

益肾软肝合剂中赤芍的定性鉴别

[目的]制定益肾软肝合剂的质量标准。[方法]采用薄层色谱法对方中赤芍进行定性鉴别。[结果]供试品色谱在与对照品、对照药材色谱相应的位置上显相同颜色的斑点,且较清晰。[结论]方法灵敏、准确,专属性强,可用于本制剂的定性鉴别和质量控制。     

复方逍遥合剂中黄芩苷的薄层扫描测定

建立了薄层扫描法测定复方逍遥合剂中黄芩苷含量,并采用TLC法对黄柏、白芍、柴胡、贝母等成分进行鉴别.黄芩苷点样量在0.15～0.75μg范围内线性关系良好(r=0.9987),平均回收率99.2%(RSD 1.5%).     

视网膜光凝对糖尿病视网膜病变患者神经纤维层厚度的影响

目的：探讨分析糖尿病视网膜病变(diabetic retinopathy,DR)患者全视网膜激光光凝术(panretinal photocoagulation,PRP)治疗后1a视网膜神经纤维层(retinal nerve fiber layer,RNFL)厚度的变化。

方法：选取2014-05/2017-06在我院行PRP治疗的92例92眼DR患者,采用OCT的DISC CIRCLE程序,测量分析以视盘为中心、直径3.45mm范围DR患者PRP术前和术后1a(采用Follow-Up程序自动追踪模式)视盘周围RNFL厚度,按视盘上方(S)、下方(I)、鼻侧(N)、颞侧(T)4个象限分区所得的数值进行统计分析。

结果：DR患者PRP术后1a较术前视盘周围上方、下方、鼻侧、颞侧和全周平均RNFL厚度明显变薄,且差异有统计学意义(均P<0.05)。

结论：PRP治疗可导致视网膜RNFL变薄,临床上应充分重视和考虑RNFL的损伤,更好地保护视网膜神经细胞的机能对DR治疗具有重要意义。     

ICL植入术后黄斑区节细胞-内丛状层及视网膜厚度的变化

目的：应用OCT观察ICL植入术后黄斑区节细胞-内丛状层及中央区视网膜厚度的改变,明确ICL植入术对于眼后节的影响。

方法：前瞻性研究。最终纳入行ICL植入术患者26例41眼,平均年龄28.19±6.48岁。所有受试者均行眼轴长度(AL)、裸眼视力(UCVA)、综合验光、最佳矫正视力(BCVA)、眼压(IOP)及OCT检查。观察术前及术后的中央区视网膜厚度(CRT)和节细胞-内丛状层厚度(GCT),以及UCVA、BCVA和IOP的变化。

结果： ICL植入术后UCVA和BCVA较术前均有提高(P<0.05),而眼压无变化。术前,术后1wk,1、3mo CRT分别为273.20±25.48、274.07±27.64、277.85±25.49、275.99±24.68μm,而GCT分别为85.31±5.19、88.95±6.87、87.73±4.23、87.45±4.59μm(均P<0.05),其中CRT在术后1mo较术前有增加(P<0.01),GCT在术后1wk,1、3mo均比术前有增加(P<0.05)。GCT在术后1wk的变化与AL呈正相关(r_s=0.529, P=0.001)。

结论：ICL植入术具有良好的有效性及一定的安全性,但术后也会发生一定的黄斑区改变,需给予一定的重视。