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91.
Ohnishi T Hiraga S Izumoto S Matsumura H Kanemura Y Arita N Hayakawa T 《Clinical & experimental metastasis》1998,16(8):729-741
In order to clarify the role of fibronectin in glioma invasion in vivo, we analyzed the relationship between fibronectin-stimulated cell migration and adhesion in 14 primary glioma cells and the expression of fibronectin and the fibronectin receptor in the corresponding tumor tissues. The tumors comprised nine glioblastomas (GB) and five anaplastic gliomas (AG) consisting of two astrocytomas, two oligoastrocytomas and one ependymoma. All glioma cells tested in the primary cell culture were found to migrate to fibronectin in a dose-dependent manner. The extent of cell migration to fibronectin was not significantly different for the GB and AG groups. On the other hand, cell adhesion to fibronectin in the AG was much stronger than that in the GB group. Immunohistochemistry demonstrated that fibronectin positively stained in the extra-cellular matrix (ECM) in eight cases and that the fibronectin receptor was positive in tumor cell membranes in 10 cases. In addition, cellular fibronectin isoforms containing ED-A and ED-B sequences were found to be immunolocalized in the tumor cells and the ECM of GB. These isoforms were also specifically expressed in tumor vessels within tumor tissues, but not in those within normal brain tissues. Cell migration tended to be expressed more strongly by glioma cells derived from tumor tissues in which fibronectin was posi-tively immunolocalized in the ECM than from tissues with negative fibronectin in the ECM. Four glioma cells derived from GB whose tumor cells did not positively stain for fibronectin receptors migrated much less extensively to fibronectin than other glioma cells whose tissues showed positive staining for the fibronectin receptor. Of these four GB, two had loss of heterozygosity in the locus of fibronectin receptor b1 gene. These results suggest that fibronectin deposited in the extracellular matrix of tumors, which can be derived from both plasma and the tumor cell itself, strongly promotes the migration of glioma cells, and that expression of the fibronectin receptor may play a critical role in the biological behavior of the tumor cells, particularly in fibronectin-stimulated cell migration in vivo.© Kluwer Academic Publishers 1998 相似文献
92.
结核性淋巴结炎的组织细胞反应性增生变型 总被引:1,自引:0,他引:1
应用结核杆菌DNA123bp特异性序列片段为靶序列的多聚酶链反应(M·TB-PCR)技术、BCG免疫组化(BCG-IHC)技术和抗酸染色(AF)方法,对38例呈现组织细胞反应性增生-碎屑样坏死-嗜中性白细胞渗出病变的淋巴结石蜡包埋组织进行了分支杆菌/结核杆菌的回顾性检测。三种方法的综合阳性率为52.6%(20/38例)。AF、BCG-IHC和M·TB-PCR的各自阳性率分别为0.8%、26.3%和50%。研究结果表明:(1)在按本文标准选择的淋巴结“组织细胞反应性增生”病变中,有半数病例与结核杆菌的感染有关,即结核性淋巴结炎可呈现“组织细胞反应性增生”之类的变型;(2)PCR技术在结核性淋巴结炎的病原学诊断上具有重要价值。 相似文献
93.
Molecular determinants of human uveal melanoma invasion and metastasis 总被引:19,自引:0,他引:19
Seftor EA Meltzer PS Kirschmann DA Pe'er J Maniotis AJ Trent JM Folberg R Hendrix MJ 《Clinical & experimental metastasis》2002,19(3):233-246
The molecular analysis of cancer has benefited tremendously from the sequencing of the human genome integrated with the science
of bioinformatics. Microarray analysis technology has the potential to classify tumors based on the differential expression
of genes. In the current study, a collaborative, multidisciplinary approach was utilized to study the molecular determinants
of human uveal melanoma invasion and metastasis. Uveal melanoma is considered the most common primary intraocular cancer in
adults, resulting in the death of approximately 50% of patients affected. Unfortunately, at the time of diagnosis, many patients
already harbor microscopic metastases, thus underscoring a critical need to identify prognostic markers indicative of metastatic
potential. The investigative strategy consisted of isolating highly invasive vs. poorly invasive uveal melanoma cells from
a heterogeneous tumor derived from cells that had metastasized from the eye to the liver. The heterogeneous tissue explant
MUM-2 led to the derivation of two clonal cell lines: MUM-2B and MUM-2C. Further morphological and functional analyses revealed
that the MUM-2B cells were epithelioid, interconverted (expressing mesenchymal and epithelial phenotypes) highly invasive,
and demonstrated vasculogenic mimicry. The MUM-2C cells were spindle-like, expressed only a vimentin mesenchymal phenotype,
poorly invasive, and were incapable of vasculogenic mimicry. The molecular analysis of the MUM-2B vs. the MUM-2C clones resulted
in the differential expression of 210 known genes. Overall, the molecular signature of the MUM-2B cells resembled that of
multiple phenotypes – similar to a pluripotent, embryonic-like genotype. Validation of select genes that were upregulated
and down-regulated was conducted by semiquantitative RT-PCR measurement. This study provides a molecular profile that will
hopefully lead to the development of new molecular targets for therapeutic intervention and possible diagnostic markers to
predict the clinical outcome of patients with uveal melanoma.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
94.
c-erbB-2、VEGF和组织蛋白酶D在胃癌中的表达及其相关性 总被引:7,自引:1,他引:7
目的:探讨癌基因c-erbB-2、血管内皮生长因子(VEGF)和组织蛋白酶D(Cath-D)在胃癌中的表达及其与胃癌生物学行为的关系。方法:采用免疫组织化学(S-P)法,检测了102例胃癌手术标本中c-erbB-2、VEGF及Cath-D的表达,同时观察了网状纤维分布与c-erbB-2、Cath-D之间的关系,并将检测结果与跟踪随访资料进行了综合分析。结果:102例胃癌组织中c-erbB-2表达阳性率为38.24%(39/102),与胃癌浸润深度(P<0.05)、淋巴结转移(P<0.05)密切相关;VEGF表达阳性率为50%(51/102),与胃癌浸润深度(P<0.01)、生长方式(P<0.01)、淋巴结转移(P<0.01)密切相关;Cath-D表达阳性率为81.37%(83/102),与胃癌浸润深度(P<0.05)、生长方式(P<0.05)、淋巴结转移(P<0.05)及脉管内有无癌栓(P<0.05)有关。对生存期分析显示:Cath-D、VEGF、c-erbB-2阳性患者预后差,5年生存率低于阴性表达患者。结论:c-erbB-2、VEGF及Cath-D与胃癌的生长、浸润、转移、预后有密切关系,可作为判断胃癌生物学行为和预后的重要指标。 相似文献
95.
Sakurai Y Shoji M Matsubara T Imazu H Hasegawa S Ochiai M Funabiki T Mizoguchi Y Kuroda M Kasahara M 《Pathology international》2000,50(8):655-659
Angiomyomatous hamartoma is a rare disease with a predisposition for the inguinal lymph nodes. A 51-year-old male patient visited a local hospital because of a right inguinal mass, measuring 3 x 4 cm in size, which was resected. The resected specimen showed irregularly distributed thick-walled vessels in the hilum, extending into the medulla and focally into the cortex of the node, eventually becoming more dispersed and associated with smooth muscle cells splaying into sclerotic stroma. These findings are compatible with an angiomyomatous hamartoma. Another tumor-like mass appeared shortly after the resection at the same location, but was not an angiomyomatous hamartoma, rather it was composed of edematous stromal tissue with proliferating smooth muscle cells. The stromal component included thick-walled blood vessels and lymphatics. Although it could not be determined whether these associated changes in the surrounding stroma are a cause or an effect of angiomyomatous hamartoma, they indicate the clinical difficulty in determining an appropriate area of resection and may provide clues to the pathogenesis of angiomyomatous hamartoma. 相似文献
96.
97.
98.
F. C. Howarth Allan J. Levi Jules C. Hancox 《Pflügers Archiv : European journal of physiology》1996,431(5):713-722
The delayed rectifier potassium current (I
K) is known to be important in action potential repolarisation and may contribute to the diastolic pacemaker depolarisation
in pacemaker cells from the heart. In this study, using whole-cell patch clamp, we investigated the characteristics of I
K in morphologically normal cells from the atrioventricular node (AVN) and ventricle of the rabbit heart. Cells were held at
−40 mV and 5 μM external nifedipine was used to block L-type calcium current (I
Ca,L). Significant I
K was observed with pulses to potentials more positive than −30 mV. The steady-state activation curve in both cell types showed
maximal activation at between + 10 and + 20 mV. Half-maximal activation of I
K occurred at −4.9 and −4.1 mV with slope factors of 8.3 and 12.4 mV in ventricular and AVN cells, respectively. Using pulses
of increasing duration, significant I
K tails after repolarisation from + 40 mV were observed with pulses of 20 ms and increased with pulses up to 100–120 ms in
both cell types. Pulses of longer duration did not activate further I
K and this suggested that only the rapid component of I
K, called I
Kr, was present in either cell type. Moreover, I
K tails after pulses to all potentials were blocked completely by E-4031, a selective blocker of I
Kr. The reversal potential of I
K varied with the concentration of external K. Superfusion of AVN cells with medium containing 4, 15 and 40 mM [K+]o resulted in reversal potentials of −81, −56 and −32 mV, respectively, which are close to values predicted if the I
K channel were highly selective for K. The time constants for deactivation of I
K in ventricle and AVN on return to −40 mV after a 500-ms activating pulse to + 60 mV were 480 ms and 230 ms, respectively.
The faster deactivation of I
K in AVN cells was a distinguishing feature and suggests that there may be differences in the I
Kr channel protein between ventricular and AVN cells.
Received: 24 July 1995 /Received after revision: 20 October 1995 /Accepted: 23 October 1995 相似文献
99.
100.
David E. Clapham Louis J. de Felice 《Pflügers Archiv : European journal of physiology》1976,366(2-3):273-276
Summary The small signal impedance of the frog node is calculated for frequencies from 1 Hz to 10,000 Hz and transmembrane potentials from –80 mV to –30 mV by linearizing the voltage clamp equations of Dodge [7] and Hille [8]. The modulus of the impedance is presented for the total system, and separately for the potassium and sodium systems as a function of frequency and voltage. There is a broad resonance in the total impedance with a voltage-dependent peak frequency. At 22°C, in the range –75 mV to –45 mV, the peak frequencies occur between 50 and 500 Hz. Removing the potassium system leaves a relatively shapr resonance centered around 200 Hz at –45 mV. 相似文献