汉防己甲素抑制三种神经递质引起的新生大鼠脑细胞内游离钙的升高

应用Ｐｕｒａ－２技术测定游离新生大鼠脑［Ｃａ２＋］ｉ浓度的技术、研究了Ｔｅｔ对静息脑［Ｃａ２＋］ｉ和３种递质引起的脑［Ｃａ２］ｉ变化的影响。Ｔｅｔ（１，１０和２０μｍｏｌ·Ｌ－１）对静息脑［Ｃａ２＋］ｉ无明显影响。Ｔｅｔ（１０μｍｏｌ·Ｌ－１）可降低Ｌ－Ｇｌｎ（０．１、１．０和１０μｍｏｌ·Ｌ－１）引起的脑（Ｃａ２＋）ｉ的升高。在Ｈａｎｋ＇ｓ液Ｃａ２＋为１．３ｍｍｏｌ·Ｌ－１时，Ｔｅｔ１０μｍｏｌ·Ｌ－１可降低Ｈｉｓ（５０和１００μｍｏｌ·Ｌ－１）和５－ＨＴ（０．１、１．０、１０和１００μｍｏｌ·Ｌ－１）引起的脑［Ｃａ２＋］ｉ的升高。但不能降低Ｈａｎｋ＇ｓ液无Ｃａ２＋时Ｈｉｓ和５－ＨＴ引起的脑［Ｃａ２＋］ｉ的升高。研究表明Ｔｅｔ可阻滞Ｌ－Ｇｉｎ、Ｈｉｓ和５－ＨＴ受体调控的钙通道。但对Ｈｉｓ和５－ＨＴ引起的细胞内贮存钙的释放并无明显影响。Ｔｅｔ的这种降低脑［Ｃａ２＋］ｉ的作用可能是其治疗脑缺血性疾病的机理之一。Ｐ＜０．０１在Ｔｅｔ１０μｍｏｌ·Ｌ－１作用下，相同浓度的细胞外液钙和Ｈｉｓ（０、５０和１００μｍｏｌ·Ｌ－１），脑［Ｃａ２＋］ｉ分别是２２１±５、２４５±５和３０２±６ｎｍｏｌ·Ｌ－１。增加了１１．８?     

Diabetic Rats Supplemented with L-Glutamine: A Study of Immunoreactive Myosin-V Myenteric Neurons and the Proximal Colonic Mucosa

We studied the neuronal density and size of myenteric neurons and the epithelial cell proliferation and crypt depth of the proximal colon in diabetic Wistar rats after supplementing them with L-glutamine (1%). The animals were divided into five groups: untreated normoglycemic (UN), L-glutamine-treated normoglycemic (NG), untreated diabetic (UD), and L-glutamine-treated diabetics 4 days (DG4) and 45 days (DG45) days after the onset of diabetes. We observed a reduction of 52.7% and 50.44% in the neuronal density of the proximal colon of the UD group compared to the UN and NG groups, respectively (P < 0.05). The neuronal density found for the DG4 (32.8%) and DG45 (28.6%) groups was higher than that of the UD group (P > 0.05). There were no significant differences (P > 0.05) when the data relative to the area of the myenteric neuron cell bodies, metaphasic index, and crypt depth in the proximal colon were compared among experimental groups.     

HPLC法测定谷氨酰胺胶囊中L-谷氨酰胺的含量

目的:建立测定谷氨酰胺胶囊中L-谷氨酰胺含量的高效液相色谱方法。方法:色谱柱为Thermo BDS HYPERSIL C₁₈柱（250 mm×4.6 mm,5μm）,流动相:己烷磺酸钠溶液（取己烷磺酸钠0.8 g,加水1 000 ml溶解,加磷酸0.5 ml,混匀）-甲醇（9:1）;流速为1.0 ml·min^-1;柱温:30℃,检测波长212 nm。结果:L-谷氨酰胺在0.1～1.0 mg·ml^-1范围内线性关系良好,r=0.999 9,平均回收率为99.3%,RSD为0.4%（n=9）。结论:本方法简单可行,结果准确,重复性好,可用于该制剂的质量控制。     

谷氨酰胺(GLN)对烧伤大鼠肠道粘膜损伤的保护作用

目的：观察肠饲谷氨酰胺（GLN）对烧伤大鼠肠粘膜的保护作用。方法：采用30%Ⅲ°烧伤大鼠早期肠道喂养模型，将20只大鼠随机分为GLN组（n =10）和NON-GLN（n =10）组，一周后处死动物，无菌取肠系膜淋巴结行细菌培养，统计细菌移位率；取门静脉血检测内毒素；对回肠粘膜行光镜检查，并用显微图像分析仪对大鼠回肠粘膜的厚度、绒毛高度和隐窝深度进行计算机图像分析。结果：GLN组大鼠回肠粘膜的厚度、绒毛高度和隐窝深度较NON-GLN组明显增加；GLN组门静脉血内毒素含量及GLN组肠系膜淋巴结细菌移位率明显低于NON-GLN组。结论：提示肠道补充GLN能有效地维护严重烧伤后肠道粘膜的结构，减少细菌移位和减少内毒素进入门静脉。