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1.
《黑龙江畜牧兽医》2016,(13)
为了研究咖啡酸锗对小鼠U14腹水瘤的抑制作用及作用机制,试验建立小鼠U14腹水瘤模型,观察咖啡酸锗对U14腹水瘤小鼠体质量及生命延长率的影响,MGG染色观察U14瘤细胞的形态变化,FCM检测U14瘤细胞的凋亡率,并观察细胞周期。结果表明:咖啡酸锗能改善U14腹水瘤小鼠的生存状态,提高生命延长率,以中剂量效果最佳;MGG染色可见较多凋亡的肿瘤细胞;咖啡酸锗能诱导U14肿瘤细胞凋亡,在G0~G1前出现一个明显的亚二倍体凋亡峰,使细胞周期被阻滞在S期。说明咖啡酸锗能改善荷瘤小鼠体质量,提高生命延长率,并能诱导肿瘤细胞凋亡,这可能是其发挥抗肿瘤作用的机制之一。 相似文献
2.
采用噻唑蓝（MTT）还原法测定梯度浓度的沙冬青提取物（JA1）对体外培养小鼠肝癌细胞株H22增殖的影响;同时对皮下移植肿瘤H22小鼠灌服不同剂量的JA1以检测抑瘤率,进一步采用流式细胞术、光镜和透射电子显微镜技术,检测和观察JA1对小鼠移植性肿瘤H22的诱导凋亡作用。结果显示,JA1可显著抑制体外培养小鼠肝癌H22细胞的增殖,并且这种抑制存在浓度和时间关系。同时,JA1对小鼠皮下移植性肿瘤H22也有明显的抑制作用。流式细胞分析表明,JA1灌胃试验组瘤组织细胞DNA直方图上见有明显的凋亡峰;在光镜和电镜下,JA1灌胃试验组也见有明显的瘤细胞凋亡,表明JA1对体内、外H22细胞的增殖抑制是以诱导凋亡为基础的。 相似文献
3.
《中国兽医学报》2015,(9):1483-1487
为了探讨旋毛虫A200711蛋白对BALB/c裸鼠皮下人肝癌H7402细胞实体瘤的抑制作用。本试验将BALB/c裸鼠右侧腋下注射人肝癌H7402细胞,建立裸鼠实体瘤模型。成瘤后,每2d向实体瘤中间部位多点注射0.2mL质量浓度为7.5mg/L的旋毛虫A200711蛋白,观察裸鼠一般临床症状及实体瘤生长情况;每3d称量裸鼠体质量,测量肿瘤直径,计算肿瘤的体积,绘制肿瘤生长曲线;3周后处死裸鼠,小心剥离肿瘤组织,称量肿瘤的重量,计算抑瘤率。20d后裸鼠腋部皮下均长出肿瘤结节,成瘤率为100%,平均直径3~5 mm;与模型对照组比较,注射A200711蛋白12d后裸鼠实体瘤体积明显缩小,抑瘤率达到39.67%。结果表明,旋毛虫A200711蛋白对裸鼠人肝癌细胞实体瘤的生长具有明显的抑制作用。 相似文献
4.
《动物医学进展》2020,(7)
观察云南松松塔乙醇提取物(PEA)、碱水提取醇沉物(PED)对H22肝癌小鼠的影响。将H22腹水瘤模型小鼠随机分组,灌胃给药,1次/d,治疗10 d。观察各小鼠一般状况及20 d内的死亡情况,计算生命延长率。建立H22实体瘤模型,分组及给药同前。给药第1天开始,隔天测量1次各小鼠肿瘤直径(mm),计算肿瘤体积;末次给药24 h后,取脾脏观察T细胞和B细胞刺激指数(SI)、NK细胞和CTL细胞杀伤活性;取瘤块,HE染色观察肿瘤细胞形态学变化。结果表明,PEA、PED各剂量组小鼠的生存质量较模型组提高,生命延长率最大分别为40.71%和51.33%;平均肿瘤体积较模型组显著减小,最大抑瘤率分别达50.06%和61.58%;T细胞和B细胞SI、NK细胞和CTL细胞杀伤活性较模型组显著升高。PEA、PED各剂量组正常肿瘤细胞减少,坏死面积增大,脂肪细胞增多。结果表明,PEA、PED可以提高H22肝癌小鼠的生存质量,延长生存期,抑制肿瘤生长,其机制与增强T细胞和B细胞转化能力,提高NK细胞和CTL细胞杀伤活性有关。 相似文献
5.
塞内卡病毒A(SVA)作为一种新发病病原,致病机制仍不清楚。通过显微镜观察发现,SVA感染PK-15细胞后能使细胞产生明显的细胞病变(CPE),同时伴随着严重的细胞凋亡。为了深入研究SVA诱导凋亡的情况,在验证SVA各蛋白真核质粒正常表达后,通过Annexin V-FITC/PI双染流式方法检测SVA各蛋白诱导凋亡的情况,Annexin V-FITC/PI和Hoechst染色后显微镜观察磷脂酰丝氨酸和核凝聚程度,通过Western blotting和RT-PCR技术分析SVA-VP1对凋亡通路中主要调控分子Caspase3、Caspase8和Bax蛋白质和mRNA水平的影响,发现SVA-VP1能够显著诱导细胞发生早期和晚期凋亡,并且能够促进凋亡蛋白Caspase3、Caspase8及Bax蛋白和mRNA水平的上调。本研究结果为深入研究SVA调控宿主细胞凋亡的分子机制和致病机制奠定了理论基础。 相似文献
6.
为了探讨不同炮制方法对人参皂苷含量及肝癌细胞凋亡的影响,采用HPLC法测定人参液中单体皂苷Rg1、Re、Rb1(三者合为总皂苷)和稀有皂苷Rg3的含量;MTT法检测不同人参提取液对人肝癌细胞HepG2的抑制率,用流式细胞仪检测细胞凋亡率。结果表明,在人参炮制过程中,人参总皂苷含量由0.56%下降到0.13%,稀有皂苷Rg3含量由0.17%增加到0.30%;抑制率检测结果表明,浓度为28.8 g/L时3种提取液对细胞的抑制作用最强,黑参组对肝癌细胞的抑制作用高于人参组和红参组;凋亡实验发现,黑参提取液对细胞的促进凋亡作用明显,人参提取液的促凋亡作用不明显。表明红参和黑参提取液可以抑制人肝癌细胞HepG2增殖并促进其凋亡,可能与参液中的稀有皂苷Rg3含量有关。 相似文献
7.
为探讨双启动子调控HN基因重组腺病毒Ad-mTERTp-mTyrp-HN对小鼠黑色素瘤动物模型的抑瘤作用,试验构建B16裸鼠皮下移植瘤模型,采用HEK293细胞扩增重组腺病毒,进行纯化和滴度检测。将重组腺病毒Ad-HN、Ad-mTERTp-HN、Ad-mTyrp-HN、Ad-mTERTp-mTyrp-HN、Ad-GFP和PBS通过尾静脉注射裸鼠,冰冻切片观察裸鼠肿瘤内GFP绿色荧光表达情况,通过肿瘤生长和裸鼠存活情况计算抑瘤率,探究其在体内的抗肿瘤作用。结果显示:重组腺病毒在HEK293细胞中扩增,滴度分别为10^11.250,10^12.250,10^10.625,10^12.125,10^12.250 TCID50/mL;肿瘤组织中能观察到黑色素细胞,证明皮下黑色素移植瘤模型构建成功;重组腺病毒对脏器无损伤,且在双启动子组脏器中没有观察到黑色素细胞的肝肺转移;通过尾静脉注射重组腺病毒后能够在肿瘤中观察到荧光表达;与其他组相比双启动子组重组腺病毒不但能抑制黑色素瘤的生长,而且能延长裸鼠的生存期,抑瘤率为55.5%。因此,该重组腺病毒Ad-mTERTp-mTyrp-HN具有靶向性,并且可以抑制肿瘤生长,可为黑色素瘤的治疗提供参考。 相似文献
8.
矢车菊素-3-芸香糖苷(C3R)是桑椹花青素的主要成分,研究从成熟桑椹中提取C3R对链脲佐菌素(STZ)诱导人源性胰岛β细胞凋亡的抑制作用及可能的调控机制。采用MTT法及流式细胞计数检测发现:桑椹C3R对正常胰岛β细胞株INS-1具有极显著的促增殖作用(P0.01);50μg/m L桑椹C3R液处理STZ诱导凋亡模型胰岛β细胞株INS-1 48 h后,其早期凋亡、晚期凋亡和坏死的细胞数量极显著下降(P0.01)。以经桑椹C3R液处理的STZ诱导凋亡模型胰岛β细胞的c DNA为模板,通过qRT-PCR检测细胞中的几个凋亡相关蛋白基因的转录水平变化,其中抗凋亡蛋白基因Bcl-x L的mRNA转录水平极显著上调(P0.01),促凋亡蛋白基因Bad、Bax及Caspase 8、Caspase 6基因的mRNA转录水平极显著下调(P0.01)。研究结果表明,桑椹C3R对STZ诱导的胰岛β细胞凋亡具有明显的抵抗作用,由此也证实了桑椹花青素的药用开发价值。 相似文献
9.
制备大鼠局灶性脑缺血再灌注实验模型,通过N-乙酰L-半胱氨酸（NAC）预处理对脑缺血再灌注损伤的保护作用,探索脑梗死病理过程及药物治疗途径。NAC预处理21d,利用栓线法建立大鼠大脑中动脉栓塞模型,造模后24h进行神经症状评分,TTC染色,检测血浆MDA、GSH含量,观察大脑皮质细胞凋亡情况及凋亡相关蛋白Bcl-2、Bax的表达。结果显示,通过神经症状评分和TTC染色判定大鼠局灶性脑缺血实验模型建立成功。与对照组相比,NAC预处理组（100mg·kg^-1）大鼠血浆中MDA含量显著降低（P〈0.05）,GSH含量显著升高（P〈0.05）;NAC模型组细胞凋亡率及Bax/Bcl-2比值明显低于对照组。结果表明,NAC通过改善氧化应激状态,调控凋亡蛋白Bcl-2、Bax表达,从而对大鼠脑缺血再灌注损伤具有一定的保护作用。 相似文献
10.
本试验选取9只健康处于泌乳期的奶山羊作为试验动物,按体重、泌乳量相近原则随机分为3组:对照组、SARA组和恢复组,对照组饲喂基础日粮;SARA组饲喂非纤维性碳水化合物与中性洗涤纤维比(NFC/NDF)为1.02、1.24、1.63和2.58的日粮诱导试验奶山羊发生SARA;恢复组诱导奶山羊发生SARA后自由采食青干草4周.取瘤胃黏膜上皮组织,采用增殖细胞抗原(PCNA)、原位末端标记(TUNEL)法检测瘤胃黏膜上皮增殖与凋亡的变化情况,并在透射电镜下观察细胞凋亡情况.结果表明,SARA对瘤胃上皮细胞增殖活性有抑制作用,对细胞凋亡有促进作用. 相似文献
11.
Ota J Giuliano EA Mullen SF Turk JR Lewis MR Cohn LA Moore CP Critser J 《Research in veterinary science》2007,83(3):355-359
Cryopreserved equine ocular squamous cell carcinoma (SCC) was inoculated subcutaneously into 15 athymic nude and 15 SCID mice. Xenotransplantation resulted in tumor growth in two athymic nude mice and 1 SCID mouse. Histological appearance and immunohistochemical characterization using cytokeratin 5/6 markers and p53 markers of the tumor grown in mice was in full accord with the original equine tumors. No evidence of metastasis was noted in any mouse. This model may serve as a relevant in vivo model for studying the biology of equine ocular SCC and for the testing of new therapeutic modalities. 相似文献
12.
The objective of the research was to characterize the clinical, fluorescein angiographic, pathologic and microscopic features of feline pulmonary carcinoma with ocular metastasis that resulted in ischemic chorioretinopathy. Four cats with confirmed or presumed primary pulmonary neoplasia with posterior segment metastasis were studied. The medical records from four cats with a diagnosis of bronchogenic carcinoma and intraocular metastasis were reviewed. Physical and ophthalmic examinations and thoracic radiographs were performed in all cases, and fluorescein angiography was performed in two cases. Classification of the neoplasms was determined by fine-needle aspiration and biopsies of peripheral metastatic lesions, and/or complete necropsies. All four cases had unilateral or bilateral blindness and ophthalmoscopic lesions characterized by a wedge-shaped, tan discoloration in the tapetal fundus, variable but mild serous exudation under the retina, and profoundly attenuated retinal vasculature. Painful swelling and necrosis of the distal extremities and/or mass lesions in the appendicular musculature were also present. Clinical findings, along with microscopic findings from biopsy specimens or complete postmortem examination, documented widespread metastasis of variably differentiated, neoplastic, columnar epithelial cells presumed to be of bronchial origin. Tumor cells were predominately located within the systemic vasculature, consistent with classification of angioinvasive pulmonary carcinoma. Fluorescein angiographic and histopathologic findings in the affected globes suggested that the posterior segment lesions resulted from invasion and growth of neoplastic cells within the chorioretinal vasculature, resulting in secondary ischemic necrosis of the retina and choroid. Ischemic chorioretinopathy and necrosis of the distal extremities, associated with primary bronchogenic carcinoma, appear to be a unique neoplastic syndrome in the domestic cat. 相似文献
13.
《Research in veterinary science》2008,84(3):355-359
Cryopreserved equine ocular squamous cell carcinoma (SCC) was inoculated subcutaneously into 15 athymic nude and 15 SCID mice. Xenotransplantation resulted in tumor growth in two athymic nude mice and 1 SCID mouse. Histological appearance and immunohistochemical characterization using cytokeratin 5/6 markers and p53 markers of the tumor grown in mice was in full accord with the original equine tumors. No evidence of metastasis was noted in any mouse. This model may serve as a relevant in vivo model for studying the biology of equine ocular SCC and for the testing of new therapeutic modalities. 相似文献
14.
Four cases of malignant neoplasia in captive wild birds are described: an adenocarcinoma of the adrenal gland in a Mountain duck (Tadorna tadornoides), a malignant melanoma in the thoracic cavity of a Combed duck (Sarkidiornis melanotos), a hepatocellular carcinoma with pulmonary metastasis in an Asian Purple Swamphen (Porphyrio porphyrio), and an undifferentiated carcinoma in the abdomen with metastasis to skeletal muscle in a White-Breasted Waterhen (Amaurornis phoenicurus). The tumors were diagnosed during a 1-year period and represented an incidence of neoplasia of 3.1%. These appear to be the first documented cases of a malignant adrenal gland tumor and a non-ocular melanoma in the order Anseriformes. The hepatocellular carcinoma failed to react with an immunoperoxidase stain for alphafetoprotein. 相似文献
15.
JF de Brito Galvao WC Kisseberth S Murahari S Sutayatram DJ Chew N Inpanbutr 《American journal of veterinary research》2012,73(8):1262-1272
Objective-To evaluate in vitro effects of gemcitabine alone and in combination with carboplatin on canine transitional cell carcinoma (TCC) cell lines. Sample-In vitro cultures of 5 canine TCC cell lines. Procedures-Cells were treated with gemcitabine, carboplatin, or a combination of both at various concentrations. Cell proliferation was assessed via a fluorescence-based microplate cell proliferation assay. Cell cycle was evaluated via propidium iodide staining, and apoptosis was assessed by measurement of caspase 3 and 7 enzymatic activity. Synergy between gemcitabine and carboplatin was quantified via combination index analyses. Results-Treatment of 5 canine TCC cell lines with gemcitabine or carboplatin decreased cell proliferation, increased apoptosis, and induced cell cycle arrest. Cell cycle arrest and apoptosis were markedly increased when cell lines were treated with both gemcitabine and carboplatin simultaneously or sequentially. Order of administration during sequential treatment did not consistently affect cell proliferation results in TCC cell lines. When TCC cell lines were treated with gemcitabine and carboplatin in combination at therapeutically relevant concentrations (gemcitabine concentration, < 10μM; carboplatin concentration, < 250μM), a significant decrease in cell proliferation was observed, compared with cell proliferation following treatment with gemcitabine or carboplatin alone. In combination, the effects of gemcitabine and carboplatin were synergistic in 3 of 5 cell lines and additive in the other 2. Conclusions and Clinical Relevance-Gemcitabine had antitumor effects on canine TCC cells in vitro, and the combination of gemcitabine and carboplatin had synergistic activity at biologically achievable concentrations. 相似文献
16.
Eric Klaphake Ahmed Shoieb Ed Ramsay Juergen Schumacher Linden Craig 《Journal of zoo and wildlife medicine》2005,36(1):127-130
A 19-yr-old binturong (Arctictis binturong) with acute upper respiratory disease was euthanized. Postmortem findings included hepatocellular carcinoma, pancreatic islet cell carcinoma, and renal adenocarcinoma with metastasis to the spleen, pleura, and pericardium. A link between primary hepatic and renal neoplasms has been noted in older humans. 相似文献
17.
Victoria D. Randall Carlos Souza Daniel Vanderhart Sarah Boston 《The Canadian veterinary journal. La revue veterinaire canadienne》2015,56(7):741-744
A 9-year-old spayed female dog diagnosed with hepatocellular carcinoma and hypertrophic osteopathy was negative for additional lesions on computed tomography of the thorax and abdomen. Resection of the affected liver lobe resulted in resolution of clinical signs. This is the first case of hypertrophic osteopathy secondary to hepatocellular carcinoma. 相似文献
18.
Peliod hepatocellular carcinoma was diagnosed in a domesticated ferret (Mustela putorius furo). The diagnosis was made using immunohistochemical analysis, histologic examination, and the accepted classification schemes based on histomorphologic features. Bilateral, adrenocortical hyperplasia also was evident. Speculation about a possible association between the variant of hepatocellular neoplasia diagnosed in this animal and its adrenal pathologic changes was done. 相似文献
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为建立能表达人白介素-28A(hIL-28A)基因的稳定转化家蚕卵巢细胞(BmN)系,构建了重组表达载体pIZT/V5-His-hIL-28A并转染BmN细胞,采用终浓度为300～400μg/mL的博莱霉素(zeocin)筛选2个月后,获得了稳定转化BmN细胞系。SDS-PAGE和Western blotting检测显示在稳定转化BmN细胞中表达的重组hIL-28A蛋白分子质量约为26kD;用ELISA试剂盒测定hIL-28A的表达水平约为2.035×10-5ng/个细胞。用噻唑蓝法(MTT法)检测hIL-28A的体外抗肿瘤活性,结果显示其对肺癌细胞A549、急性早幼粒细胞白血病细胞HL60、肝癌细胞BEL-7402和乳腺癌细胞M231的半数抑制浓度(IC50)分别为3.21、2.84、6.29和9.32ng/mL。研究结果表明hIL-28A可在稳定转化BmN细胞中表达,表达产物具有体外抗肿瘤活性。 相似文献