生物信息大分子功能的研究——酵母甘露聚糖对鼠Sarcoma-180瘤生长的抑制效应

酵母甘露聚糖(Mannan,简称Man)是能参与生物信息流影响生物体、特别是在糖基化方面起着重要调控作用的生物信息大分子。它是否能在抑制生物机体中肿瘤生长方面具有重要作用?研究结果表明:酵母甘露聚糖既能使患S-180瘤鼠的体质增强的同时又有抑制其体内所患S-180瘤生长的功效。Man抑制患鼠机体内的S-180瘤生长的功效(抑瘤率)随用量的增加而提高,当Man用量达360 mg(40 mg/Kg/d·9d)时,其抑瘤率达98.4%的最高水平,此时鼠体重增加1.66倍。Man的抑瘤功效有最佳适用量并存在性别敏感性,通常是雄性鼠的抑瘤率高于雌性鼠。Man抑制鼠S-180肿瘤生长的作用优于市售5-氟尿嘧啶的作用。

转录组分析揭示荷叶离褶伞菌多糖LDS-1抗小鼠S180肿瘤的分子机制

以荷叶离褶伞菌多糖LDS-1、甘露聚糖肽和空白对照作用下的小鼠S180肿瘤细胞为研究材料,运用RNA-Seq测序技术进行生物信息学分析,结果显示LDS-1组、甘露聚糖肽组和空白对照组分别获得8.27、 8.35和8.97 G的分析数据.高表达基因(FPKM>2 200)分析显示LDS-1主要通过下调Rplp1基因调控细胞分裂,将S180细胞停滞在G1期以抑制其分裂.差异基因分析结果显示LDS-1主要通过上调Alb、 Timp4、 Apoa1基因调节蛋白表达或者细胞黏连性,抑制S180肿瘤细胞迁移.KEGG(京都基因与基因组百科全书)通路富集结果显示, LDS-1抑制S180肿瘤生长的关键基因主要富集在过氧化物酶体增殖物激活受体(PPAR)信号通路中,上游Fabp3基因下调,激活下游Apoa1、Slc27a2和Adipoq等多个基因上调,调控S180细胞的脂质代谢和胆固醇代谢. LDS-1能够通过调控高表达关键基因Rplp1,差异表达关键基因Alb、 Timp4、 Apoa1,以及PPAR信号通路抑制S180肿瘤细胞的增殖分裂、能量获取和迁移侵袭.

草黄口蘑多糖对S180荷瘤小鼠抗肿瘤活性分子机制研究

多糖作为口蘑属真菌的主要功能成分之一,具有免疫调节、抗氧化及抗肿瘤等活性。为明确草黄口蘑多糖的结构特征及其对S180荷瘤小鼠抗肿瘤活性相关分子机制,该研究以草黄口蘑子实体经热水浸提法提取的草黄口蘑多糖[Tricholoma lascivum (Fr.)Gillet polysaccharide,TLG-1]为实验材料,初步解析TLG-1结构,以S180荷瘤小鼠为模型检测体内抗肿瘤活性,并采用转录组测序技术对S180肿瘤组织总RNA进行测序分析。结果表明,TLG-1重均分子质量为13 442 Da,由木糖、甘露糖、葡萄糖和半乳糖4种单糖组成,其比例为1.57∶1.45∶2.84∶4.14。TLG-1可显著抑制荷瘤小鼠S180肿瘤的生长(P<0.01),抑瘤率为53.8%。转录组测序分析显示,TLG-1能显著上调mt-Co1、Prlr、Foxa1以及下调Pitx2、Rplp1、Eef1a1及Lgals1等基因,影响S180肿瘤细胞的代谢途径,调控细胞周期并抑制上皮间质转化过程。基因本体富集分析表明,TLG-1可激活细胞因子介导的信号通路,引发细胞免疫。京都基因与基因组百科全书富集分析显示,在Jak-STAT信号通路中的Il21、Il12rb2、Il12b、Il2ra、Il2rb、Il2rg、Il15ra和Ifng等基因显著上调,通过转换肿瘤相关巨噬细胞表型及分泌干扰素-γ等,增强小鼠抗肿瘤免疫应答。该研究结果为草黄口蘑多糖的开发和利用提供了一定的理论基础。

Antitumor effect and mechanism of Gecko on human esophageal carcinoma cell lines in vitro and xenografted sarcoma 180 in Kunming mice

AIM: To investigate the anti-tumor effect of Chinese medicine Gecko on human esophageal carcinoma cell lines and xenografted sarcoma 180 in Kunming mice and its mechanism. METHODS: The serum pharmacological method was used in vitro . The growth rates of the human esophageal carcinoma cells (EC9706 or EC1) were measured by a modifi ed 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The transplanted tumor model of the mouse S180 sarcoma was established. Fifty mice were randomly divided into fi ve groups (n = 10). Three Gecko groups were treated respectively with oral administration of Gecko powder at a daily dose of 13.5 g/kg, 9 g/kg, and 4.5 g/kg. The negative group (NS group) was treated with oral administration of an equal volume of saline and the positive group (CTX group) was treated with 100 mg/kg Cytoxan by intraperitoneal injection at the fi rst day. After 2 wk of treatment, the anti-tumor activity was evaluated by tumor tissue weighing. The impact on immune organ was detected based on the thymus index, spleen index, phagocytic rate and phagocytic index. The protein expression of vascular endothelingrowth factor (VEGF) and basic fibroblast growth factor (bFGF) were detected by immunohistochemistry. The cell apoptotic rate was detected by terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) assay. RESULTS: The A value in each group treated with Gecko after 72 h was reduced signif icantly in EC9706 and in EC1. The tumor weight in each group of Gecko was decreased signifi cantly (1.087 ± 0.249 vs 2.167 ± 0.592; 1.021 ± 0.288 vs 2.167 ± 0.592; 1.234 ± 0.331 vs 2.167 ± 0.592; P < 0.01, respectively). However, the thymus index and Spleen index of mice in Gecko groups had no significant difference compared with the NS group. The immunoreactive score of VEGF and bFGF protein expression of each Gecko group by immunohistochemical staining were lowered signifi cantly. The apoptosis index (AI) of each group was increased progressively with increase of dose of Gecko by TUNEL. CONCLUSION: Gecko has anti-tumor effects in vitro and in vivo; induction of tumor cell apoptosis and the down-regulation of protein expression of VEGF and bFGF may be contributed to anti-tumor effects of Gecko.

Anticancer effect of Jinlongshe granules on in situ-transplanted human MKN-45 gastric cancer in nude mice and xenografted sarcoma 180 in Kunming mice and its mechanism

AIM： To study the antitumor effect of Chinese compound Jinlongshe （JLS） granules on sarcoma 180 and MKN-45 human gastric cancer cell lines in vivo and its mechanism. METHODS： After establishment of S180 sarcoma （S180） and MKN-45 gastric cancer model of nude mice, the tumor-bearing mice were divided into 5 groups at random. Three experimental groups were respectively given the aqueous extract of JLS granules at doses of 120 g, 60 g and 20 g/（kg per 6/wk,i.g） for 3 wk in S180 and 6 wk in nude mice model. Positive control was given cyclophosphamide （Cy） at a dose of 50 mg/（kg per 3/wk, i.g） for 3 wk in S180 models and 5-Fluorouracil （5-FU） 20 mg/（kg per 3/wk, i.g） for 3 wk in nude mice model. Negative control was given normal saline （NS） at a dose of 0.18 g/（kg per 6/wk, i.g） respectively. After 3 wk in mice bearing S180 tumor and 6 wk in nude mice model, the experimental animals were sacrificed and the masses of tumor were weighed, and the rates of tumor inhibition of each treated group were calculated respectively. To determine the antitumor mechanisms, the morphological changes, cell cycle and apoptosis were observed in MKN-45 nude mice model. Annexin V-FITC/PI double staining FCM assay was used to further determine the live cells, apoptotic cells, necrotic cells and debris. RESULTS： The inhibitory rates of JLS granules at the doses of 20 g/kg, 60 g/kg and 120 g/kg were 50.31%, 55.94% and 68.13% （P 〈 0.01） in nude mice models and 40.90%, 50.32% and 58.46% （P 〈 0.01） in S180 model. The inhibitory rate of Cy was 85.22% in S180 models and the inhibitory rate of 5-FU was 53.43% in nude mice model （P 〈 0.01）. Nuclear chromatin and margination were observed under a transmission electron microscope （TEM）. The G0/G1 phase was arrested, typical apoptotic peak appeared, the apoptotic rate was 22.81%-38.54% in three JLS granule-treated groups. Annexin V-FITC/PI double staining FCM assay showed that the apoptotic cells were 4.36%, 3.08% and 7.08% in three dosages, most cells were localized in the low right quadrant. CONCLUSION：Jinlongshe granules possess anti-tumor effects on experimental tumor models in vivo, and apoptosis induction is one of its anti-tumor mechanisms.

AUGMENTATION OF IMMUNE FUNCTIONS AND AUTOLOGOUS TUMOR-KILLING ACTIVITY BY KAPPA-SELENOCARRAGEENAN IN MICE BEARING SARCOMA 180

Objective: To study the enhancement of the immune functions and autologous tumor killing (ATK) activity by kappa selenocarrageenan (KSC) in mice bearing sarcoma 180. Methods: To measure the effects of KSC and/or Cyclophosphamide (Cy) on natural killer (NK) activity, lymphokine activated killer (LAK) activity, the produc tion of interleukin 2 (IL 2), ATK activity and the growth of sarcoma 180 (S 180 ). Results: KSC promoted NK activity, LAK activity and ATK activity in vivo , increased IL 2 production at 40 mg/kg/d×9d. It also enhanced the antitumor action of Cy (20 mg/kg/d×9d) and offset the inhibition of Cy on immunocopetent cells. The ATK activity in splenocytes of S 180 bearing mice could be induced and increased by recombinant interleukin 2 (rIL 2) in vitro . Conclusion: KSC has an up regulating effect on the immune functions and ATK activity in tumor bearing mice. It can be used as a biological response modifier (BRM) in cancer biotherapy.

Modulation of MMP-2 and TIMP-2 by low dose radiation in mice bearing S180 sarcoma

Objective To investigate the inhibition of low dose radiation （LDR） on S180 sarcomas and its modulation of MMP-2 and TIMP-2 in mice. Methods $180 subcutaneously implanted tumor model mice were randomly divided into two groups： control （N） and low dose radiation （LDR） groups. N mice were sacrificed after 12 h, whereas LDR mice were sacrificed after 12 （LDR-12 h）, 24 （LDR-24 h）, 48 （LDR-48 h）, and 72 （LDR-72 h） h. Thereafter, we measured the tumor volumes. Histopathology was performed, and P-V immunohistochemistry was applied to assess MMP-2 and TIMP-2 expression. Results Compared with the control group, the tumor growth was significantly inhibited in the LDR groups （P 〈 0.05）. MMP-2 expression was considerably reduced in LDR-24h （P 〈 0.05） and LDR-48h （P 〈 0.05）, whereas the change of TIMP-2 was not obvious in the LDR groups （P 〉 0.05） in contrast to that of the control group. Conclusion LDR can effectively suppress the growth of S180 implanted tumors by reducing MMP-2, which is associated with invasion and metastasis.

Effect of hyperthermia in combination with cryotherapy on sarcoma 180 in mice

The significant decrease in tumor recurrence caused by combined hyperthermia (local water bath) with cryotherapy has previously been shown. This study demonstrated an in vivo additive interaction of local microwave diathermy (hyperthermia, 42±0.5℃, 20 min. ) and liquid nitrogen treatment (cryotherapy,-180℃, 3 min. ) against intraperitoneally implanted sarcoma 180 in ICR mice. Local hyperthermia was produced by applicating 2450 MHz microwave to the region of the tumor without induction of significant whole body hyperthermia.Both hyperthermia and cryotherapy were delivered as a single dose individually on day 1 and day 2. The analysis of the tumor size curves showed that all of the treatments had more significant effect on sarcoma 180 than on the control group (P < 0. 0001 ). The optimal sequence of the combined therapies found in the experiment was cryotherapy→hyperthermia (CH) (P<0. 0001). Weights of the tumors excised from the mice on day 11 showed that the combined therapies (cryotherapy→hyperthermia or hyperthermia→cryotherapy) were more effective on sarcoma 180 than hyperthermia or cryotherapy used alone(P<0.01).

Fruiting increases total content of flavonoids and antiproliferative effects of Cereus jamacaru D.C. cladodes in sarcoma 180 cells in vitro

Objective: To evaluate the influence of fruiting phenological stage on total flavonoid content, antioxidant activity, and antiproliferative effects of Cereus jamacaru(C. jamacaru)(mandacaru) cladodes and fruit. Methods: Fruit and cladodes at vegetative and fruiting stage of C. jamacaru were collected. The fruit was dissected and bark, pulp, and seeds were separated. Vegetative and fruiting cladodes, together with bark, pulp, and seeds were used to obtain five hydroalcoholic extracts. The extracts were investigated for total flavonoid content, using AlCl3 colorimetric method, antioxidant activity by 2,2-diphenyl-1-picrylhydrazyl and 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) radical scavenging capacity and Fe^(2+) ion chelating activity, and in vitro antiproliferative effects(sarcoma 180 cells) by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2 H-tetrazolium bromide assay. Results: The extract of C. jamacaru cladodes at the fruiting stage showed higher flavonoid content compared to the other extracts. Seed extracts showed the highest antioxidant activity in 2,2-diphenyl-1-picrylhydrazyl and 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) assays, and the extract of cladodes at vegetative stage showed better antioxidant activity in Fe^(2+) ion chelating activity. The extract of fruiting cladodes promoted higher antiproliferative effects compared to the other extracts. Conclusions: These findings suggest that fruiting increases the content of flavonoids and antiproliferative effects of C. jamacaru cladodes. Data reinforce the potential use of C. jamacaru cladodes and fruits as natural antioxidants and potent anticancer agent.

Saponin from Tupistra chinensis Bak Inhibits NF-κB Signaling in Sarcoma S-180 Cell Mouse Xenografts

This study examined the effect of saponins from Tupistra chinensis Bak （STCB） on the growth of sarcoma S-180 cells in vitro and in mouse xenografts as well as the underlying mechanisms. Cell proliferation was assessed by MTT assay. Cell cycle distribution was determined by flow cytometry. Sarcoma S-180 tumor-bearing mice were treated with different doses of STCB with 10 μg/mL 5-fluorouracil （5-Fu） as a positive control. The activity of nuclear factor （NF）-κB was detected by gel mobility shift assay. The mRNA level of NF-κB was determined by real-time quantitative RT-PCR. The results showed that in vitro STCB inhibited the growth of S-180 cells in a concentration-dependent manner, which was accompanied by cell cycle arrest at S-phase. In vivo STCB significantly inhibited the growth of S-180 tumor mouse xenografts in a dose-dependent manner with apparent induction of cell apoptosis. Moreover, STCB inhibited the activity of NF-rd3 p65 and reduced the expression of NF-κB p65 mRNA in mouse xenografts. It was concluded that STCB inhibits the proliferation and cell cycle progression of S- 180 cells by suppressing NF-κB signaling in mouse xenografts. Our findings suggest STCB is a promising agent for the treatment of sarcoma.

The effect of low-dose total body irradiation on tumor-inhibition and signal transduction in tumor tissues of mice bearing S180 sarcoma

Objective： By studying the influence of low-dose total body irradiation to proliferating cell nuclear antigens （PCNA）, epidermal growth factor receptor （EGFR）, erythropoietin （EPO） and vascular endothelial growth factor receptor （VEGFR） of tumor tissues in mice bearing S180 sarcoma, to further explore the mechanism of low doses radiation. Methods：S180 sarcoma cells were implanted subcutaneously into 58 male Kunming mice. Randomly these mice were divided into sham-irradiation （S） group and low-dose radiation （LDR） group. 12 days after implantation, the mice in LDR group were once delivered 75 mGy total-body ^60Co y-ray irradiation, while the mice in S group were left without irradiation. Then the mice in LDR group were executed at 6 h （LDR-6h group）, 12 h （LDR-12 h group）, 24 h （LDR-24 h group）, 48 h （LDR-48 h group） and 72 h （LDR-72h group） after irradiation. Tumor tissues were weighed and histological observed. Immunohistochemical staining was used to detect the expression of PCNA, VEGF, EPO and VEGFR of tumor tissues. Results： Though there was no significant difference between LDR group and S group in tumor weight, after irradiation the expression of PCNA and EPO of tumor tissues in LDR group decreased with time. LDR-24h, LDR-48h and LDR-72h groups were all statistically significantly different from S group. The expression of EGFR and VEGFR also decreased, and LDR-24h group was the lowest （P 〈 0.05）. Conclusion： Seventy-two h after low-dose total body irradiation, there was no significant change in tumor size of mice bearing S180 sarcoma. Low-dose total body radiation decreased the expression of PCNA inhibiting tumor growth; reduced the expression of EGFR in tumor tissue impacting the signal transduction of tumor cells. The study also indicated that low-dose total body irradiation, within a certain period of time, can decrease the expression of hypoxia factor EPO and VEGFR, which may improve the situation of tumor hypoxia and radiosensitivity of tumor itself.

EFFECTS OF GALLIUM AND ITS COMBINATION WITH SELENIUM ON MOUSE S_180 SARCOMA AND BONE GALLIUM CONTENT

Kunming female mice were used and S180 sarcoma cells were transplanted subeutaneously into right anterior armpit or the mice. The mice were divided into three groups randomly, and orally administered with water, gallium chloride and GaCl3+ Na2SeO3 respectively for 2 weeks. After that,the tumors and foreleg bones were taken out for study. The experimental results showed that oral administration with gallium chloride-could inhibit the growth or S180 sarcoma in mice and the tumor morphology was changed. Selenium could accelerate the gallium entering into bone. This fact might supply a new clue to further clinical application of gallium and selenium.

绞股蓝总皂甙对小鼠S_(180)肉瘤及K_(562)细胞的抑制作用

目的 绞股蓝总皂甙 (GP)对小鼠S180 肉瘤及K562 细胞的抑制作用。方法 通过动物实验观察绞股蓝总皂甙对小鼠S180 肉瘤生长状况、肿瘤坏死面积 (TNA)与肿瘤总面积 (TTA)的比率、瘤周瘤内免疫活性细胞浸润状况及荷瘤小鼠脾脏的影响 ;通过细胞培养观察绞股蓝总皂甙对K562 细胞生长的抑制作用。结果 经重复实验证实 ,GP能显著抑制小鼠S180 肉瘤的生长 ,TNA与TTA的比率显著增加 ,瘤周尤其是瘤内淋巴细胞、巨噬细胞浸润数量明显增加 ,荷瘤小鼠脾重增加、脾白髓数目增多、体积增大。同时证实 ,GP对K562 细胞株具有明显的生长抑制作用。结论 GP的抑瘤作用主要是直接杀伤瘤细胞 。

番茄红素对S_(180)荷瘤小鼠抗肿瘤作用的实验研究

目的 研究番茄红素 (LP)的体内抗肿瘤作用。方法 通过S1 80 肉瘤建立荷瘤小鼠模型 ,给予番茄红素后观察荷瘤小鼠肿瘤生长情况及对小鼠免疫系统和抗氧化酶的影响。结果 给药后能够增强脾脏淋巴细胞增殖能力 ,提高自然杀伤细胞 (NK)活性 ,可升高小鼠血清SOD、GSH Px活性 ,降低MDA含量 (P <0 0 5 )。结论 番茄红素具有明显的抗肿瘤作用 ,其作用可能是通过提高免疫系统功能和机体的抗氧化酶活力来实现的。

小柴胡汤对小鼠肉瘤S_(180)的抑制作用和血浆内皮素的影响

目的：探讨小柴胡汤（ＸＣＨＴ）对小鼠肉瘤Ｓ１８０的抑瘤作用及机制。方法：通过体内实验，观察不同浓度ＸＣＨＴ浸膏对小鼠肉瘤Ｓ１８０的抑制作用和用放射免疫测定法（ＲＩＡ）测定荷瘤小鼠血浆内皮素（ＥＴ）含量的变化。结果：高、中和低浓度ＸＣＨＴ（１０ｇ／ｍｌ，０５ｇ／ｍｌ和０２５ｇ／ｍｌ）溶液治疗１０天后，对小鼠肉瘤Ｓ１８０有明显的抑瘤作用，抑瘤率为４７７％～５６６％。同时发现荷Ｓ１８０肉瘤小鼠血浆内皮素水平明显高于正常对照组（Ｐ＜００５），而经过高、中、低浓度ＸＣＨＴ溶液治疗后荷Ｓ１８０肉瘤小鼠血浆内皮素含量明显降低，达到正常或低于正常水平。结论：ＸＣＨＴ对小鼠肉瘤Ｓ１８０的生长具有抑制作用。

牛磺酸对小鼠移植瘤S_(180)肉瘤影响的研究

小鼠喂以基础饲料，对照组和实验组两组动物分别饮水和１％牛磺酸，进行下列实验：１．接种Ｓ１８０肉瘤后，各组又分为不注射环磷酰胺（ＣＴＸ）和注射环磷酰胺进行化疗两组。观察小鼠存活时间、肉瘤大小及抑瘤率。结果表明：补充牛磺酸的荷瘤小鼠存活时间（３５．７±２３．７）天，明显长于对照组（１８．７±５．６）天，抑瘤率为４２．２６％，牛磺酸与ＣＴＸ合用的小鼠生存至６１天仍无一例死亡，也未见到肉眼肿块，抑瘤率为１００％。对照组用ＣＴＸ小鼠存活时间（３９．８±１２．３）天，与未用ＣＴＸ小鼠无差别。２．小鼠接种艾氏腹水瘤瘤细胞后，观察瘤细胞的膜流动性。结果表明：接种艾氏腹水瘤后，牛磺酸组瘤细胞膜的荧光偏振度ｐ＝０．１０８±０．０２０、微粘度η＝０．６１８±０．１４０；而对照组ｐ＝０．１３９±０．０２０，η＝０．８７４±０．１５０，说明牛磺酸组细胞膜的流动性明显优于对照组（Ｐ＜０．０１）。３．以碳素廓清法和血清溶血素生成测定两组免疫功能。牛磺酸组小鼠的免疫功能也明显高于对照组（Ｐ＜０．０１）。以上结果证明：牛磺酸具有抑瘤效果，在用ＣＴＸ进行化疗时，具有明显的协同效应。其抑瘤效果可能与牛磺酸能加强机体免疫功能、保护细胞膜的稳定性和?

基因重组别藻蓝蛋白对小鼠S_(180)肉瘤的抑制作用

研究基因重组别藻蓝蛋白 (RAPC)的抑瘤作用 ,给皮下接种S180 瘤细胞的小鼠 ,每天分别ig及ipRAPC 13 4mg/kg ,6 7mg/kg和 3 4mg/kg ,共 10d ,第 11d处死小鼠 ,称瘤重和胸腺重 ,计数白细胞。结果表明 ,RAPC对小鼠S180 肉瘤有显著抑制作用 ,瘤重抑制率在 45 %～ 64 %之间 ,ig及ip均有效 ,对荷瘤小鼠的胸腺指数和白细胞数量无明显影响。

一株产鬼臼毒素内生真菌的分离及其代谢产物抗小鼠S180肉瘤的研究

目的从秦岭濒危药用桃儿七(Sinopodophyllum hexandrum)植株内分离出产鬼臼毒素(podophyllotoxin)的内生真菌,研究其发酵液的抑瘤活性。方法采用组织分离法分离、纯化桃儿七植株根、茎部位的内生真菌,逐一鉴定其代谢产物,筛选出能够产鬼臼毒素的内生真菌。采用动物体内抑瘤实验研究内生真菌发酵液对小鼠S180肉瘤的抑制作用,并对荷瘤小鼠眼眶取血进行白细胞及淋巴细胞计数。结果分离出一株产鬼臼毒素的内生真菌T8,鉴定为Cephalosporium sp.。T8发酵液实验动物组的肿瘤质量低于模型组,大于环磷酰胺组(P<0.05),且其抑制率低于环磷酰胺(P<0.05)。T8发酵液能够促进白细胞和淋巴细胞的增殖。结论 T8发酵液具有一定的抑制肿瘤生长的作用,经减毒处理后可以作为肿瘤治疗的辅助药物。

小柴胡汤对荷瘤鼠S_(180)细胞生长和结构影响的研究

目的：通过体内实验，探讨小柴胡汤（ＸＣＨＴ）浸膏对荷瘤鼠Ｓ１８０的抑制作用。方法：采用透射电镜观察小柴胡汤对瘤细胞生长和结构的影响。结果：高、中和低浓度ＸＣＨＴ（１０００ｇ·Ｌ－１、５００ｇ·Ｌ－１、２５０ｇ·Ｌ－１）溶液治疗后，对荷瘤鼠Ｓ１８０细胞均有明显抑制作用，抑瘤率４０１９％～５８７３％，其中以高浓度组疗效最佳。同时可见经ＸＣＨＴ治疗后各组Ｓ１８０细胞均出现凋亡的特征，表现为细胞体积变小，核固缩，胞浆和核染色质凝集，密度增高，细胞间有大量凋亡小体，其中以低浓度组为甚，而高浓度组Ｓ１８０细胞则以坏死为主。结论：ＸＣＨＴ对荷瘤鼠Ｓ１８０有明显抑制作用，可诱导Ｓ１８０细胞凋亡及坏死，其中瘤细胞以哪种死亡方式为主。

小剂量顺铂联合^(32)P玻璃微球对小鼠S180瘤细胞的细胞毒作用

【目的】研究腹腔注射小剂量顺铂联合瘤内注射32P玻璃微球对小鼠S180实体瘤细胞的细胞毒作用,通过透射电镜观察比较不同治疗对肿瘤细胞的超微结构影响。【方法】将实验动物荷S180瘤小鼠28只随机分为4组,各组7只。4组小鼠随机定为空白对照组、单纯顺铂组、单纯32P玻璃微球间质注射组和顺铂联合32P玻璃微球间质注射组,治疗两周后取出肿瘤称瘤体质量,计算各组抑瘤率。分别取各组肿瘤组织行透射电镜观察,比较不同治疗对肿瘤细胞超微结构的影响。【结果】单纯顺铂组、单纯32P玻璃微球间质注射组及顺铂联合32P玻璃微球间质注射组抑瘤率分别为47%、40%、76%。小剂量顺铂联合32P玻璃微球间质注射组与两单独治疗组抑瘤率的差异有统计学意义(P﹤0.01)。电镜观察联合组细胞死亡率达75%,绝大部分肿瘤细胞消失,呈大片坏死结构。【结论】腹腔注射小剂量顺铂联合32P玻璃微球间质注射内放射治疗对小鼠S180实体瘤细胞的细胞毒作用较单独应用有明显增强。