面部皮损激光术后积雪甙乳膏治疗的效果

目的观察面部皮损激光术后应用积雪甙乳膏治疗的效果。方法将61例病人的面部皮损随机分为积雪甙乳膏试验组和对照组。试验组面部皮损激光术后,创面每日应用0.5 g/L碘附消毒1次,消毒后创面涂积雪甙乳膏适量;对照组创面每日应用0.5 g/L碘附消毒1次并保持创面清洁。比较两组创面愈合时间及1月与6月后创面情况积分。结果试验组创面愈合时间明显短于对照组,差异有显著性(t=3.30,P<0.01)。两组1月后创面情况积分比较差异有显著性(t=4.04,P<0.01);两组6月后创面情况积分比较差异有显著性(t=7.81,P<0.01)。结论积雪甙乳膏具有促进创面愈合、防治病理性瘢痕形成的作用,面部皮损激光术后应用积雪甙乳膏治疗效果确切,值得进一步研究和临床应用。     

口服积雪苷和槲皮素对兔耳增生性瘢痕的影响

目的:探讨口服积雪苷和槲皮素对兔耳增生性瘢痕的影响。方法:新西兰大白兔9只,在兔耳腹侧制备标准创面(每耳4个,共72个),随机分为3组:空白对照组、积雪苷组及槲皮素组。4周后收集标本,从瘢痕横截面最高点制作切片,比较各组的瘢痕增生指数。结果:积雪苷组(1.55±0.03)与空白对照组(1.67±0.02)相比,瘢痕增生指数明显降低(17.9%),有统计学显著性差异(P=0.003)。槲皮素组(1.59±0.03)与空白对照组相比,两者瘢痕增生指数无统计学显著性差异(P=0.053)。结论:口服积雪苷可显著抑制兔耳瘢痕增生,口服槲皮素对兔耳增生性瘢痕的抑制作用尚待进一步实验证实。     

PVA-PEG physically cross-linked hydrogel film as a wound dressing: experimental design and optimization

The development of hydrogel films as wound healing dressings is of a great interest owing to their biological tissue-like nature. Polyvinyl alcohol/polyethylene glycol (PVA/PEG) hydrogels loaded with asiaticoside, a standardized rich fraction of Centella asiatica, were successfully developed using the freeze–thaw method. Response surface methodology with Box–Behnken experimental design was employed to optimize the hydrogels. The hydrogels were characterized and optimized by gel fraction, swelling behavior, water vapor transmission rate and mechanical strength. The formulation with 8% PVA, 5% PEG 400 and five consecutive freeze–thaw cycles was selected as the optimized formulation and was further characterized by its drug release, rheological study, morphology, cytotoxicity and microbial studies. The optimized formulation showed more than 90% drug release at 12?hours. The rheological properties exhibited that the formulation has viscoelastic behavior and remains stable upon storage. Cell culture studies confirmed the biocompatible nature of the optimized hydrogel formulation. In the microbial limit tests, the optimized hydrogel showed no microbial growth. The developed optimized PVA/PEG hydrogel using freeze–thaw method was swellable, elastic, safe, and it can be considered as a promising new wound dressing formulation.     

积雪草苷对大鼠心肌缺血再灌注损伤的保护作用研究

目的 研究积雪草苷(AC)对在体大鼠心肌缺血再灌注损伤的保护作用, 初步探讨其机制。方法 40只SPF级Wistar大鼠, 随机分为假手术组、心肌缺血再灌注模型组及积雪草苷低、中、高剂量组, 每组8只。积雪草苷低、中、高剂量组分别以2.5、5.0、10.0 mL/kg体质量的剂量连续ig药液14 d, 药液质量浓度1.5 mg/mL。其他各组同时点ig 0.5%羧甲基纤维素钠溶液。除假手术组外, 其他各组结扎左冠状动脉前降支, 使心肌缺血30 min, 再灌注60 min。用7020全自动生化分析仪检测血清中超氧化物歧化酶(SOD)、乳酸脱氢酶(LDH)、肌酸激酶同工酶(CK-MB)活性和丙二醛(MDA)水平;ELISA法测定血清中C反应蛋白(CRP);TUNEL法检测各组大鼠缺血心肌细胞凋亡;RT-PCR法检测B细胞白血病/淋巴瘤-2基因(Bcl-2)和与Bcl-2相关的x蛋白(Bax)的mRNA表达。结果 与模型组比较, 积雪草苷各剂量组均能降低血清中LDH、CK-MB活性及MDA的量(P<0.05), 升高血清中SOD活性(P<0.05);降低血清中CRP水平(P<0.05);降低心肌细胞凋亡指数(P<0.05);积雪草苷各组凋亡基因Bcl-2表达水平上升(P<0.05), Bax表达水平下降(P<0.05), Bcl-2/Bax比值升高(P<0.05)。结论 积雪草苷预处理能通过减少心肌细胞凋亡、抗脂质过氧化物产生及抗炎症反应等机制, 对心肌缺血再灌注损伤产生保护作用。     

积雪苷霜软膏对豚鼠皮肤色素沉着的影响

目的研究积雪苷霜软膏对皮肤色素沉着的抑制作用,为其治疗色素沉着性疾病提供实验依据。方法中波紫外线(UVB)照射豚鼠以形成皮肤色素沉着模型。造模第30日后将模型鼠分为模型组及积雪苷霜组。模型组给予赋形剂,积雪苷霜组每日涂积雪苷霜软膏,连续30日,检测皮肤组织酪氨酸(Tyr)、超氧化物歧化酶(SOD)、丙二醛(MDA)含量的变化,并运用Elivision~(TM)plus免疫组化法和图像分析法观测黑色素细胞在表皮中的分布及其分泌功能。结果模型组表皮黑色素沉着增加,Tyr、MDA含量明显升高,SOD含量降低。积雪苷霜组能减轻模型豚鼠表皮黑色素沉着,显著降低Tyr、MDA水平,升高SOD水平。结论积雪苷霜软膏对UVB诱导的豚鼠皮肤色素沉着有一定的抑制作用。     

大鼠血浆中积雪甙浓度的HPLC/MS/MS测定

建立了HPLC／MS／MS测定大鼠血浆中的积雪甙。以柴胡皂甙D为内标，采用XTerra C18柱，流动相为O．1％乙酸和含O．1％乙酸的乙腈，梯度洗脱。质谱条件为电喷雾离子源，检测方式为多反应检测，定量分析离子为m／z981．5→493（积雪甙）和803→331（柴胡皂甙D），血浆样品采用固相萃取处理。检测限为0．5ng／ml。     

Evaluation of the healing activity of hydrocotyle tincture in the treatment of wounds

The object of this study was to evaluate the healing activity of Cothyline^TM, a new formulation comprising asiaticoside as the main ingredient in combination with antiseptic adjuvants. The study has two parts: (1) a clinical phase involving the observation of patients afflicted with soiled wounds and chronic or recurrent atony which was resistant to the usual treatment, and (2) an experimental phase in which the healing action of Cothyline was evaluated by light and electron microscopic observation of the morphological changes that occurred in scarified guinea pig skin. Treatment of patients with Cothyline completely healed (64%) or improved (16%) the lesions under study. In the animal study, it was shown that changes occurred in the shape and size of the keratohyaline granules, a phenomenon observed during accelerated healing. To the best of our knowledge, this is the first time that the healing action of Cothyline has been demonstrated in an objective and controlled manner. Cothyline has the unique advantage of simultaneously acting as an antiseptic and a cicatrizant; moreover, it affects all four phases of healing. This drug constitutes a new and advantageous approach in the treatment of wounds.     

积雪草甙对兔耳增生性瘢痕TGF-β1 mRNA表达的影响

目的：通过建立兔耳腹侧增生性瘢痕的模型,探讨积雪草甙（Asiaticoside,hd）对TGF-β1 mRNA表达的影响。方法：新西兰大白兔20只（喂养过程中死亡4只）,在兔耳腹侧制备直径为1cm、深达软骨膜的圆形瘢痕93个,随机分为4组：空白对照组、得宝松组、低浓度积雪草甙组（25mg／m1）、高浓度积雪草甙组（50mg／m1）,分别于瘢痕制备3天后局部应用相应药物,2周后取材,分别测量瘢痕组织TGF-β1 mRNA的表达量。结果：积雪草甙组与空白对照组相比,TGF-β1 mRNA表达量明显降低,有明显统计学差异（P〈0．01）;积雪草甙与阳性对照组相比,二者mRNA表达量无统计学差异（P〉0．05）;积雪草甙组之间,高浓度组与低浓度组相比有统计学差异（P（0．05）。结论：较高浓度积雪草甙注射液局部注射可以减少增生性瘢痕TGF-β1mRNA的表达。     

积雪草总苷及其制剂的含量研究.Ⅰ.积雪苷霜软膏中积雪草苷和羟基积雪草苷的HPLC法测定

建立了流动相添加剂-HPLC法测定积雪苷霜软膏中积雪草苷和羟基积雪草苷的含量.采用C_(18)色谱柱,以乙腈-水(30:70,添加β-环糊精4.54 g/L)为流动相,检测波长204nm.积雪草苷和羟基积雪草苷在0.2～20μg范围内线性关系良好,平均回收率为99.20%和98.90%,RSD为1.06%和1.17%.     

Factors affecting the content of pentacyclic triterpenes in Centella asiatica raw materials

Context: Pentacyclic triterpenes, mainly, asiatic acid, madecassic acid, asiaticoside, and madecassoside are the active constituents of Centella asitica (L.) Urban. (Apiaceae). These compounds possess various pharmacological activities that have been shown to assist with wound healing and brain enrichment.

Objective: Determination of these active pentacyclic triterpenes in extracts from the various parts of C. asiatica plants harvested at different times of the year and grown in different environments.

Materials and methods: The separate plant parts selected were leaves, stolons, petioles, flowers, fruits, and nodes with roots. Dried powder from each part was extracted with ethanol by microwave-assisted extraction and subjected to determination of their content of the four pentacyclic triterpenes using a HPLC method. The effects of the places of cultivation as well as harvesting periods on the content of the four pentacyclic triterpenes in the extracts were also determined.

Results and discussion: Among the various parts of C. asiatica, the leaves contained the highest amount of pentacyclic triterpenes with a total content of pentacyclic triterpenes of 19.5 mg/g dry powder. However, the contents of the pentacyclic triterpenes in C. asiatica varied according to the place of cultivation and the harvesting period. C. asiatica collected from Trang, Thailand gave the highest content of total pentacyclic triterpenes (37.2 mg/g dry powder) when harvested in March, while those collected from Songkhla, Thailand gave the highest value (37.4 mg/g dry powder) when collected in December. C. asiatica collected from Nakornsrithammarat and Ratchaburi, Thailand gave the lowest content of total pentacyclic triterpenes in all experimental harvesting periods.