Objective To study the relationships between expressions of somatostatin receptor subtypes（SSTR1-SSTR5） and angiogenesis in colorectal cancer. Methods The expressions of SSTR1-SSTR5, VEGF, and CD34 in the paraffin sections of colorectal cancer tissues from 127 cases were detected by the standard streptavidin-peroxidase (SP) technique. CD34 was used as a marker to account microvessel density (MVD) in colorectal cancer tissues. The relationships between the expressions of SSTR1-SSTR5 and VEGF expression, or MVD were analyzed. Results The positive expression rate of SSTR1, SSTR2, SSTR3, SSTR4, and SSTR5 was 64.6% （82/127）, 36.2% （46/127）, 18.9% （24/127）, 18.9% （24/127）, and 38.6% （49/127） in colorectal cancer tissues, meanwhile, the positive expression rate of VEGF was 63.8% （81/127） and MVD was (34.67±16.62)/HP in colorectal cancer tissues. The positive expression rate of VEGF (47.8%， 22/46) and MVD 〔(29.00±15.32)/HP〕 in colorectal cancer tissues with SSTR2 positive expression were significantly lower than those in colorectal cancer tissues with SSTR2 negative expression 〔72.8%， 59/81； (37.90±16.56)/HP〕, Plt;0.05. There were no relationships between SSTR1, SSTR3, SSTR4, and SSTR5 expression and VEGF expression or MVD （Pgt;0.05）. Conclusion The positive expression of SSTR2 is related with angiogenesis in colorectal cancer tissues.
目的:探讨重组人IGF-1和生长抑素-14单独及联合应用对甲状腺相关眼病患者眼眶成纤维细胞增殖的影响。方法:体外培养甲状腺相关眼病患者眼眶成纤维细胞,采用四甲基偶氮唑盐(MTT)比色法检测不同浓度及作用时间的重组人IGF-1和生长抑素-14对细胞增殖的作用。结果:50μg/L以上浓度IGF-1对眼眶成纤维细胞有促增殖作用,5nmol/L以上浓度的SST对眼眶成纤维细胞的生长有抑制作用,均呈量效和时效关系。IGF-1和SST联合应用时, 50nmol/L以上的SST能阻断100μg/L的IGF-1促细胞增殖的作用。结论:IGF-1可刺激眼眶成纤维细胞增殖。SST能抑制眼眶成纤维细胞增殖,并能阻断IGF-1促进细胞增殖的作用,此抑制作用与浓度有关,提示SST能直接通过受体后机制抑制IGF-1诱导的眼眶成纤维细胞增殖。
【Abstract】ObjectiveTo investigate the inhibitory effects of somatostatin analogue (SSTA) on the colonic carcinoma cell growth in vitro and in vivo and its possible mechanism. MethodsThe somatostatin receptor type Ⅱ (SSTR2) mRNA of colonic carcinoma cell line HCT116 was detected by using RTPCR and hybridization in situ. The effects of octreotide (Oct) or NC-8-12 (specific agonist of SSTR2 ) on the proliferation of HCT116 was measured with MTT after HCT116 stimulated by insulin or epidermal growth factor (EGF) and incubated with Oct or NC-8-12 simultaneously for 24 hours. The expression of cyclin D1 was detected with flow cytometry. The HCT116 were implanted in nude mice subcutaneously and treated with Oct or NC-8-12. The tumor volume and tumor weight were measured according to schedule. Results①SSTR2 mRNA was detected in HCT116 and the tumor implanted in nude mice; ②Insulin and EGF increased the proliferation of HCT116 significantly, and this proliferation could be inhibited by Oct and NC-8-12 partially; ③Insulin increased the Cyclin D1 expression of HCT116, its level decreased slightly when treated with Oct or NC-8-12 but not significantly (Pgt;0.05); ④The weight and volume of implanted tumor in nude mice treated with Oct or NC-8-12 showed no significant difference compared with the control group (Pgt;0.05). ConclusionBoth Oct and NC-8-12 could inhibit the proliferation of colonic carcinoma cell line HCT116 in vitro, which indicated that SSTR2 may mediated the inhibition. Oct and NC-8-12 have no effect on the growth of implanted HCT116 in nude mice in this experiment.
【Abstract】ObjectiveTo investigate the inhibitory effects and the mechanisms of octreotide (OCT) on the growth of hepatocellular carcinoma (HCC). MethodsBel7402 HCC cells were studied for proliferative ability by MTT assay, morphology by light microscopy, adhesive and invasive ability by cell adhesion and “wound strack” experiments. Immunofluorescence flow cytometry was used for study of cMet expression and cell cycle as well. Furthermore, the effects of OCT on tumor growth metastasis were investigated in nude mice with implanted HCC. The expression of cMet in implanted tumor cells was studied by immunohistochemistry. ResultsWith OCT treatment, the proliferative ability of Bel7402 cells and cell morphology didn’t change. The adhesive and invasive ability decreased compared with no OCT treatment cells (P＜0.05). The ratio of G0/G1 cells increased markedly (P＜0.05). The proportion of Bel7402 cells expressing cMet was reduced significantly (P＜0.05). The growth of implanted tumor was inhibited with OCT treatment (P＜0.05). The intensity of cMet expression in OCT group was remarkably weaker than that in control group. In addition, no recurrence and metastasis was found in OCT group 7 weeks after curative resection of xenografts, while 3 cases in controd group were observed to have the recurrence and metastasis. The intensity of cMet immunolabeling in the metastatic tumors was higher than that in xenografts of control group, but the difference was not significant. ConclusionOCT inhibits the growth of HCC by downregulation of cMet.
To investigate the origin and releasing relation of motilin (MTL), vasoactive intestinal peptide (VIP) and somatostatin (SS) in guinea pig bile as well as its effects during gallstone formation. Guinea pig were divided into three groups: control group (50 animals), on normal diet; lithogenic group (70 animals), fed with lowprotein low fat; and recovering group (50 animals), fed with lowprotein low fat and recovering normal food after the experiment of gallstone formation. MTL, VIP and SS in the bile gallbladder tissue and portal vein plasma of the normal control group were measured with radioimmunoassay. Meanwhile the changes of the gut peptides in the bile and the bile components from different groups were also compared. Results: In control group the levels of MTL, VIP and SS in the bile were higher than those in the plasma, but, obviously lower than those in the tissues, the concentration relationship between in the bile and in the tissue was a positive correlation. In contrast to the control group, MTL concentration decreased but VIP and SS increased in the bile of the lithogenic group, the physicochemical nature of the bile also became lithogenic. In the recovering group the bile also became lithogenic, but, the concentration of those peptides and the nature of the bile all got normal. Conclusion: MTL, VIP and SS in guinea pig bile originate mainly form the gallbladder wall tissues. Food components affect the levels of the gut peptides in bile, which promote the bile lithogenic changes and gallstone formation.
【摘要】目的探讨生长抑素(somatostatin,SS)和表皮生长因子(epidermal growth factor,EGF)在银屑病治疗中的相互作用机制。方法选择2008年1月12月门诊和住院的寻常型银屑病患者68例,用放射免疫法检测正常组织和各期银屑病皮损中SS和EGF的表达。结果进行期银屑病皮损中EGF明显高于静止期、恢复期皮损和正常皮肤(P＜001);各期银屑病皮损与正常皮肤中SS差异无统计学意义(P＜005)。结论SS可能是通过抑制EGF而在银屑病的治疗中起关键作用。
ObjectiveTo detect the effect of adeno-associated-virus induced Kringles5 gene on retinal neovascularization in rats with retinopathy of prematurity (ROP), and to explore the new ways of treatment for ROP.MethodspSNAV-Kringle5-gfp carrier was constructed by subclone and adeno-associated-virus was packed to form rAAV-Kringle5-gfp. ROP model was set up under circumstances of high oxygen in 21 SD rats which were divided into experimental (21 eyes) and control group (21 eyes). Eighteen eyes from each group was used to making the histologic section of retina, and the other 3 eyes in each group was detected by polymerase chain reaction (PCR) and Western blotting. There were 5 rats in the normal control group. AAV-Kringle5-gfp with the dosage of 10 μl and titer of 2.5×1012vg/ml was injected into the eyes in experimental group, while rAAVlacZ with the same dosage and titer of 2.5×1011vg/ml was injected in to the eyes in control group. The expression of target gene in ocular tissues was observed under the fluoroscope. Twelve weeks later, the rats were executed, and the staining of Ⅷ factor related antigens in retinal vascular endothelial cells was performed and number of nucleolus of vascular endothelial cells were counted. ResultsThe plasmid of pSNAV-Kringle5-gfp was correct according to the sequence measurement; the expression of rAAV-Kringle5-gfp was found in vitreous cavity and on retina; the expression of target gene was found on the level of mRNA and protein; the number of nucleolus of vascular endothelial cells on the surface of retina was (19.954 2±3.825 7) in experimental group and (7.335 2±2.731 3) in the control group, which had significant difference between the two groups (P＜0.01）.ConclusionsAdeno-associated-virus induced Kringles5 gene can inhibit the occurrence of retinal neovascularization in patients with ROP.(Chin J Ocul Fundus Dis, 2005,21:288-291)
目的 探讨生长抑素-14肽与生长激素联合应用在预防胰十二指肠切除术后并发症发生中的作用。方法 我院1995年3月至2003年3月共收治因胆总管下段癌、十二指肠乳头癌及胰头癌行胰十二指肠切除术患者48例，对其中26例（治疗组）应用生长抑素-14肽6 mg/d（持续微量泵泵入）及生长激素8 U/d（分两次肌注）治疗，余22例为对照组，术后常规应用全肠外营养及抗生素治疗，比较两组的治疗结果。结果 术后发生并发症对照组17例（77.3%），治疗组5例（19.2%），两组比较差异有显著性意义（P＜0.05）。治疗组胰液量及胰周引流液中淀粉酶的含量明显低于对照组（P＜0.05），两组术前、术后蛋白质指标，治疗组于术后第7天基本恢复到术前水平，而对照组第10天才达到术前水平。结论 联合应用生长抑素及生长激素能有效降低胰十二指肠切除术后并发症的发生率。