Vitreoretinal toxicity of basic fibroblast growth factor

Basic fibroblast growth factor (b-FGF) is one of the multifunctional growth factors with important therapeutic potential in the field of ophthalmology. It is also implicated in pathogenesis of vitreoretinal proliferative diseases. In the present study, we evaluated its vitreoretinal toxicity by means of clinical observation, electroretinography (ERG), and histopathology after injection of different doses of b-FGF into the vitreous of rabbit eyes. Doses of b-FGF up to 2 g per eye caused no toxicity; however, injection of 4 g or more resulted in sight-threatening vitreoretinal proliferative changes. This information is important for studies aimed at evaluating the therapeutic potential of b-FGF in retinal diseases.Despite some degree of vitreous organization and opacification, retinal folds, and small areas of traction retinal detachment, the amplitudes of ERGs were normal or even increased (hyperpolarization) in eyes which received 8 g of b-FGF.     

b-FGF的表达以及血管生成对子宫腺肌病发病的影响

目的探讨血管生成及组织增生在子宫腺肌病发病机制中的作用。方法应用免疫组化法检测56例腺肌病子宫及26例正常子宫中b-FGF的表达和MVD值。结果b-FGF在腺肌病组异位内膜和对照组正常内膜中的阳性表达率分别为64.3%和38.4%(P<0.05)。在异位内膜周围肌层中的阳性表达率为66.1%,明显高于对照组子宫肌层(42.3%,P<0.05)。MVD与b-FGF在异位内膜及异位内膜周围肌层中的表达水平呈明显正相关(P<0.01)。结论b-FGF的表达增强以及与MVD的正相关性同子宫腺肌病的发病机理有关。*     

日本血吸虫童虫细胞体外培养条件的初步研究

目的 探讨日本血吸虫童虫细胞体外培养条件。方法 选取转铁蛋白、核苷酸、碱性成纤维细胞生长因子(b-FGF)、黄体酮以及非必需氨基酸与维生素组合等5种促进细胞增殖的因子作为考察因素，每种因素选取添加与不添加两个水平，采用正交设计，以RPMI-1640为基础培养液，配制16种条件培养基对日本血吸虫童虫细胞进行体外培养，通过动态观察和AKP组化染色法及直观法分析法获得不同培养条件影响细胞增殖和细胞活力的结果。结果 第2，4，9，13，14孔中的组织出现明显的细胞增殖现象，其细胞AKP检测值也相应较高，各孔中培养细胞的AKP值经直观分析表明：促进细胞增殖最佳因素组合为C181A1，即转铁蛋白、核苷酸、b-FGF。结论 转铁蛋白、核苷酸、b-FGF对日本血吸虫童虫细胞增殖具有明显促进作用。     

血管内皮生长因子、碱性成纤维细胞生长因子和一氧化氮合酶3在恶性黑素瘤的表达及其意义

目的研究血管内皮生长因子（VEGF），碱性成纤维细胞生长因子（b-FGF），一氧化氮合酶3（NOS3）在恶性黑素瘤中的表达及其生物学意义，并探讨其与肿瘤血管形成及淋巴结转移的关系。方法用免疫组化（S-P法）染色技术对45例黑色素瘤石蜡组织标本的VEGF、b-FGF、NOS3及肿瘤内微血管密度（MVD）进行检测和分析。结果VEGF、b-FGF表达与TNM分期、MVD及淋巴结转移有关（P〈0.05），两者共表达与MVD有关（P〈0．01）。NOS3与MVD及淋巴结转移有关（P〈0.05）；相关分析显示促血管形成因子（VEGF、b-FGF）与NOS3的表达呈正相关（r=0．2298，P〈0.05）。结论VEGF和b-FGF在促进肿瘤血管形成和转移方面可能起协同作用，并且有NO3的参与；VEGF、b-FGF、NOS的检测对于判断黑色素瘤转移和预后及治疗具有临床应用价值。     

Platelet-derived growth factor, basic fibroblast growth factor, and interferon gamma increase type IV collagen production in human fetal mesangial cells via a transforming growth factor-beta-dependent mechanism.

BACKGROUND: Glomerulosclerosis is characterized by glomerular accumulation of extracellular matrix following mesangial cell proliferation. The precise pathomechanism of glomerulosclerosis is still undetermined. Platelet-derived growth factor (PDGF) and basic fibroblast growth factor (b-FGF) are known to be mitogenic for mesangial cells, and interferon gamma (IFN-gamma) is known to have an inhibitory effect on mesangial cell proliferation. We attempted to clarify the role of these cytokines on mesangial matrix production using cultured human fetal mesangial cells (HMC). METHODS: HMC were incubated with these cytokines for 24-72 h and the levels of type IV collagen and TGF-beta in the cell supernatants were measured by enzyme immunoassay. RESULTS: PDGF, b-FGF, and IFN-gamma stimulated type IV collagen production by HMC in a dose- and time-dependent manner. The anti-TGF-beta neutralizing antibody clearly inhibited their stimulatory effect on type IV collagen production. PDGF and b-FGF also stimulated TGF-beta production by HMC in a dose-dependent manner, although IFN-gamma did not. CONCLUSION: PDGF, b-FGF, and IFN-gamma stimulate type IV collagen production in cultured HMC via a TGF-beta-dependent mechanism.     

垂体肿瘤转化基因与碱性成纤维细胞生长因子在急性白血病中的表达和临床意义

为了探讨垂体肿瘤转化基因（PTTG）与碱性成纤维细胞生长因子（b-FGF）在急性白血病中的表达及其与急性白血病预后的相关性,采用免疫细胞化学染色方法检测53例急性白血病患者及15例非急性白血病患者的PTTG蛋白和b-FGF的表达水平.结果表明,急性白血病组PTTG蛋白和b-FGF表达较非急性白血病组明显升高,两者呈显著性差异（P＜0.01）.在急性白血病组中,化疗后完全缓解的患者与初发的病人比较有显著差异（P＜0.01）,并且PTTG蛋白和b-FGF的表达呈正相关（r=0.61,P＜0.01）.结论：PTTG蛋白和b-FGF在急性白血病中高表达,而且与化疗疗效密切相关,这提示PTTG蛋白与b-FGF的检测对于急性白血病的诊断、疗效评价及预后估计均有一定意义,PTTG与b-FGF参与了急性白血病的发展.     

Overexpression of the neuron-specific molecule bm88 in mouse neuroblastoma cells: Altered responsiveness to growth factors

Previous studies have shown that the BM88 antigen, a novel neuron-specific molecule, promotes the differentiation of mouse neuroblastoma (Neuro 2a) cells. In particular, stably transfected, with the BM88 cDNA, Neuro 2a cells overexpressing the BM88 antigen (Neuro2a-BM88 cells) are morphologically distinct from the nontransfected Neuro 2a cells; they exhibit enhanced process outgrowth and a slower rate of division. In this study we used Neuro2a and the morphologically differentiated Neuro 2a-BM88 cells to compare their responsiveness to growth factors. The growth factors we used were nerve growth factor (NGF), basic-fibroblast growth factor (b-FGF), and glial cell-line derived neurotrophic factor (GDNF). In addition, we used glial conditioned medium derived from either newborn mouse cerebral cortex (NBCC) or aged mouse cerebral hemispheres (MACH), as a source of normal glial factors. Because these cells express the cholinergic phenotype, we used choline acetyltransferase (ChAT) activity as a biochemical marker for comparison. A differential responsiveness to these factors was observed between Neuro 2a and Neuro 2a-BM88. The presence of NGF, 25 ng/ml, in the culture medium did not affect ChAT activity in either cell type. In contrast to NGF, in the presence of b-FGF, 5 ng/ml, the transfected cells, Neuro 2a-BM88, responded with a marked increase in ChAT activity. On the other hand, with GDNF, 1 ng/ml, only Neuro 2a cells showed an increase in ChAT activity. Finally, we found no response to the glial conditioned media, although these media contain several growth factors, including b-FGF. In conclusion, our findings show that overexpression of the neuron-specific antigen BM88 in neuroblastoma cells modifies their properties with respect to growth factor sensitivity, and, hence, the Neuro 2a and Neuro 2a-BM88 are suitable cell models to examine the role of growth factors in neuronal differentiation.     

参术生肌汤灌洗青紫兰兔直肠切除术后吻合口黏膜细胞中含b-FGF、CD68、VEGF者比对愈合的影响研究

目的:探讨参术生肌汤灌洗对青紫兰兔直肠吻合口需粘膜细胞中含碱性成纤维细胞生长因子(b-FGF)、CD68、血管内皮细胞生长因子(VEGF)者比对愈合的影响研究。方法:青紫兰兔30只,在距肛门约5 cm处作直肠吻合,然后随机分成两组。空白组给予常规治疗,实验组于术后第1日起给予参术生肌汤灌洗,每日2次,连续6 d。6 d后处死两组兔子,取含有吻合口的直肠约2 cm。免疫组化检测空白组、实验组吻合口需直肠黏膜细胞中含b-FGF、CD68、VEGF阳性者的比例,研究其对愈合的病理生理影响。结果:空白组、实验组b-FGF阳性细胞数分别为19.73±2.22,27.80±4.10;CD68阳性细胞数分别为19.87±2.20,13.73±2.71;VEGF阳性细胞数分别为18.20±2.81,24.27±2.25;两组间相比,均有明显差异(P0.01)。结论:参术生肌汤可促进直肠吻合口需的b-FGF、VEGF的增殖,同时减轻直肠术后吻合口区的炎症反应(CD68),有助于促进吻合口的愈合。     

环氧化酶-2抑制剂塞莱昔布对急性白血病细胞VEGF、b-FGF和TGF-β mRNA表达的影响

本研究旨在探讨环氧化酶-2(COX-2)特异性抑制剂塞莱昔布(celecoxib)对急性白血病细胞血管新生因子血管内皮生长因子(VEGF)、碱性成纤维细胞生长因子(b-FGF)和转化生长因子-β(TGF-β)mRNA表达的影响及其意义。采用半定量逆转录多聚酶链反应(RT-PCR)法检测30例急性白血病细胞经塞莱昔布干预前、后VEGF、b-FGF和TGF-βmRNA表达及变化。结果表明,急性白血病细胞存在VEGF、b-FGF和TGF-βmRNA的表达。VEGFmRNA与b-FGF mRNA表达存在正相关(r=0.559,P=0.001),VEGF mRNA与TGF-βmRNA表达存在负相关(r=-0.4,P=0.029)。经塞莱昔布(80μmol/L,48 h)处理后急性白血病细胞的VEGF、b-FGF和TGF-βmRNA表达较对照组明显下降,差异有统计学意义(P<0.01)。结论:塞莱昔布通过下调血管新生因子的表达而抑制血管增生,对急性白血病治疗具有辅助作用。