Downregulation of iASPP Expression Suppresses Proliferation, Invasion and Increases Chemosensitivity to Paclitaxel of Head and Neck Squamous Cell Carcinoma / 中国医学科学杂志(英文版)

Objective Our previous study has revealed that iASPP is elevated in human head and neck squamous cell carcinoma (HNSCC) and iASPP overexpression signifcantly correlates with tumor malignant progression and poor survival of HNSCC. This study investigated the function of iASPP playing in proliferation and invasion of HNSCC . Methods HNSCC cell line Tu686 transfected with Lentiviral vector-mediated iASPP-specific shRNA and control shRNA were named the shRNA-iASPP group and shRNA-NC group, respectively. The non-infected Tu686 cells were named the CON group. CCK-8 assay, flow cytometry, transwell invasion assay were performed to detect the effects of iASPP inhibition . Results Our results demonstrated that the proliferation of shRNA-iASPP cells at the time of 72 h (=32.459, =0.000), 96 h (=51.407, =0.000), 120 h (=35.125, =0.000) post-transfection, was significantly lower than that of shRNA-NC cells and CON cells. The apoptosis ratio of shRNA-iASPP cells was 9.42% ± 0.39% (=299.490, =0.000), which was significantly higher than that of CON cells (2.80% ± 0.42%) and shRNA-NC cells (3.18% ± 0.28%). The percentage of shRNA-iASPP cells in G0/G1 phase was 74.65% ± 1.09% (=388.901, =0.000), which was strikingly increased, compared with that of CON cells (55.19% ± 1.02%) and shRNA-NC cells (54.62% ± 0.88%). The number of invading cells was 56 ± 4 in the shRNA-iASPP group (=84.965, =0.000), which decreased significantly, compared with the CON group (111 ± 3) and the shRNA-NC group (105 ± 8). The survival rate of shRNA-iASPP cells administrated with paclitaxel was highly decreased, compared with CON cells and shRNA-NC cells (=634.841, =0.000). Conclusion These results suggest iASPP may play an important role in progression and aggressive behavior of HNSCC and may be an efficient chemotherapeutic target for the treatment of HNSCC.

EphA2 mediated vascular endothelial growth factor expression via the p38 MAPK signaling pathway in squamous cell carcinoma of the head and neck / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate the regulatory effect of erythropoietin-producing hepatocellular receptor (EphA2) on the expression of VEGF protein, a pro-angiogenic factor, via p38 mitogen-activated protein kinase (p38 MAPK) signaling pathway in squamous cell carcinoma of the head and neck(SCCHN) in vitro.</p><p><b>METHODS</b>SCCHN Tu686 cells were transfected with EphA2 overexpression vector pEGFP-N1-EphA2. Western blot was used to detect the expression of p38 MAPK and enzyme-linked immunosorbent assay (ELISA) was applied to assay of VEGF. SB203580 as a inhibitor of p38 MAPK signaling pathway was used.</p><p><b>RESULTS</b>The expression of VEGF protein was significantly up-regulated in Tu686 cells transfected with EphA2 overexpression vector (535.31 ± 45.71) pg/ml, when compared with Tu686 cells transfected with empty vector (400.99 ± 33.50) pg/ml and Tu686 cells with no transfection (385.30 ± 33.50) pg/ml (F = 17.091, P < 0.01). The expression of phosphorylated p38 MAPK was obviously increased in Tu686 cells with EphA2 overexpression. SB203580 inhibited the expressions of VEGF and phosphorylated p38 MAPK proteins in Tu686 cells with EphA2 overexpression.</p><p><b>CONCLUSION</b>EphA2 can regulate the expression of VEGF protein and stimulate p38 MAPK signaling pathway.</p>

Irradiation induced epithelial-mesenchymal transition in nasopharyngeal carcinoma in vitro / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate the irradiation induced epithelial-mesenchymal transition (EMT) in nasopharyngeal carcinoma (NPC) in vitro.</p><p><b>METHODS</b>NPC CNE-2 cells with radioresistance (CNE-2-Rs) were established by exposure to gradiently increased dose of irradiation. CCK-8 cell viability kits, colony formation assay and fluorescence-activated cell sorting analysis were used to confirm the capacity of radioresistance of CNE-2-Rs cells. Invert microscope was used to monitor the morphological changes and western blot was applied to detect the expression of epithelial cell marker E-cadherin and mesenchymal cell marker Vimentin during the phase of CNE-2 exposure to irradiation.</p><p><b>RESULTS</b>Irradiation exposure successfully induced the radioresistance of CNE-2 cells. After exposed to irradiation, the survival rate in CNE-2-Rs was higher than that in CNE-2 by CCK-8 assays. No significant difference of proliferation ability was observed between the CNE-2 and CNE-2-Rs pre-radiotherapy, but a higher proliferation ability in the CNE-2-Rs post-radiotherapy. By using the colony forming assay, the parameters of CNE-2 and CNE-2-Rs in multi-target single-hit and linear quadratic model were obtained and the data demonstrated that parameters mean lethal dose (D0) , quasi-thres hold dose (Dq) , surrival fraction in 2Qy (SF2) and mean inctivation dose (MID) value increased, α and α/β value decreased (P < 0.05) . At the same time, the CNE-2-Rs cells showed higher percentage of cells in S and G2 phase (P < 0.05) . In terms of biomorphology, CNE-2-Rs cells were more narrow, long strips or fusiform shapes, stretched out tentacles, and the contacts between them were loosened. When radiation dose accumulated to 24 Gy, an over-expression of Vimentin was observed in treated cells, while E-cadherin was down-regulated (P < 0.01) .</p><p><b>CONCLUSIONS</b>NPC cells present with typical morphorlogical and biomolecular changes of EMT during exposure to irradiation, indicating the potential critical roles of EMT in the malignant behavior of radioresistance in NPC.</p>

Expression of astrocyte elevated gene-1 protein and its clinical significance in laryngeal squamous cell carcinoma / 中华病理学杂志

<p><b>OBJECTIVE</b>To assess the protein expression of astrocyte elevated gene-1 (AEG-1) in tissue specimens of laryngeal squamous cell carcinoma (LSCC), and to correlate its expression with clinicopathological parameters and prognosis in patients with LSCC.</p><p><b>METHODS</b>RT-PCR was used to assay the expression of AEG-1 mRNA in 13 pairs of LSCC tissues and their corresponding noncarcinoma epithelia. Immunohistochemistry was performed on paraffin-embedded tissue specimens to investigate the protein expression of AEG-1 in 88 cases of LSCC specimens and 15 cases of adjacent epithelial samples.</p><p><b>RESULTS</b>The expression of AEG-1 mRNA was significantly increased in LSCC tissues compared to adjacent noncarcinoma epithelial tissues (0.81 ± 0.17 vs. 0.23 ± 0.10;t = 10.337, P < 0.001). Meantime, the positive rate of AEG-1 protein in 88 cases of LSCC was 87.5% (77/88). However, 15 cases of adjacent noncarcinoma epithelial merely demonstrated negative or mild expression of AEG-1 protein. AEG-1 overexpression was closely correlated with T stage (χ(2) = 6.289, P = 0.018), clinical stage (χ(2) = 11.049, P < 0.01), metastasis (χ(2) = 20.859, P < 0.01) and recurrence(χ(2) = 13.459, P < 0.01). The overall survival rates of patients with AEG-1 overexpression and low expression were 35.9% and 86.4%, respectively (χ(2) = 23.409, P < 0.01). Multivariate Cox regression analysis revealed that AEG-1 expression was an independent prognostic factor (P = 0.016).</p><p><b>CONCLUSION</b>AEG-1 protein may play a critical role in the initiation and progression of LSCC, implicating its predictive value in prognosis.</p>

EphA2 promotes angiogenesis and metastasis of head and neck squamous cell carcinoma in vivo / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate the effects of EphA2 on the angiogenesis and cervical lymph node metastasis of squamous cell carcinoma of the head and neck (SCCHN) in vivo.</p><p><b>METHODS</b>EphA2 short hairpin (shRNA) lentiviral particles were used to knockdown the expression of EphA2 in SCCHN cell line M2 with high lymph nodes metastasis rate. Stable clones, obtained by puromycin screening, were assayed by RT-PCR and Western blot to validate the gene silencing efficiency and were used to establish SCCHN metastatic xenograft mouse model. Hematoxylin-eosin staining was applied to identify cervical lymph node metastasis of SCCHN in xenografted tumors. Immunohistochemistry was used to observe microvessel density. Western blot was used to investigate the protein expressions of EphA2 and vascular endothelial, growth factor (VEGF).</p><p><b>RESULTS</b>EphA2 shRNA lentiviral particles efficiently decreased the mRNA and protein expressions of EphA2 in SCCHN cell line M2, which were further successfully utilized to establish SCCHN metastatic xenograft mouse model. Compared with xenografted tumors in control group, xenografted tumors in M2EphA2RNAi(+) group decreased significantly tumor volume [(430.7 ± 190.0) mm(3) (x(-) ± s) vs (1179.0 ± 289.4) mm(3)] and weight [(0.26 ± 0.10) g vs (0.54 ± 0.12) g] (both P < 0.05). More importantly, bilateral cervical lymph node metastasis rate in M2EphA2RNAi(+) was also greatly declined (Mann-Whitney U = 10.0, P < 0.05). Decreased protein expressions of EphA2 and VEGF and microvessel density were observed in M2EphA2RNAi(+) group (t = 26.751, P < 0.01).</p><p><b>CONCLUSIONS</b>Knockdown of EphA2 expression led to the inhibition of tumor growth and metastasis in SCCHN nude mouse model. More importantly, SCCHN angiogenesis was also impeded, which might be associated with the decreased expression of VEGF.</p>

Expressions and clinical significance of high mobility group box-1 mRNA and protein in laryngeal squamous cell carcinoma tissues and serum / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate the mRNA and protein expressions of high mobility group box-1 (HMGB1) in the tumor tissues and sera of patients with laryngeal squamous cell carcinoma (LSCC) and their clinical significance.</p><p><b>METHODS</b>Semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) and Western blot were used to detected the expressions of HMGB1 mRNA and protein in the tumors and adjacent normal epithelial tissues in 30 patients with LSCC. Serum HMGB1 protein levels in the patients with LSCC and in 10 healthy volunteers were detected with enzyme-linked immunosorbent adsorption experiment (ELISA).</p><p><b>RESULTS</b>RT-PCR demonstrated that the mean relative mRNA expression levels of HMGB1 (HMGB1/GAPDH) in LSCC tissues and in adjacent normal epithelial tissues were 1.25 ± 0.12 and 0.32 ± 0.04, respectively (t = 40.27, P < 0.05). Western blot revealed that the mean relative protein expression levels of HMGB1 (HMGB1/β-actin) were 1.29 ± 0.10 and 0.34 ± 0.03 (t = 49.84, P < 0.05), respectively. Both mRNA and protein expression levels of HMGB1 were associated with T stage, clinical stage, lymph node metastasis status and smoking (all P < 0.05), but no significant correlation with age, alcohol consumption and primary tumor grade and location (all P > 0.05). Mean serum HMGB1 protein levels in patients with LSCC and healthy volunteers were (24.80 ± 14.08) ng/ml and (23.58 ± 14.69) ng/ml (t = 0.37, P > 0.05).</p><p><b>CONCLUSIONS</b>Both mRNA and protein expressions of HMGB1 were obviously elevated in LSCC, which were associated closely with T stage, clinical stage and lymph node metastasis.</p>

Expression of HMGB1 protein in laryngeal squamous cell carcinoma and its clinical significance / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To evaluate the expression of HMGB1 protein in tissue specimens of laryngeal squamous cell carcinoma (LSCC) and adjacent normal mucosa, and explore the correlation of HMGB1 protein expression with clinicopathologic features and prognosis in LSCC.</p><p><b>METHODS</b>Ninty-three cases of LSCC and 5 cases of adjcent mucosal tissue samples were included in this study. Immunohistochemical staining was performed on paraffin-embedded tissue specimens to examine the HMGB1 protein expression. The data were futher correlated with the clinicopathological features and prognosis of the LSCC patients.</p><p><b>RESULTS</b>The positive rates of HMGB1 expression in LSCC specimens was 87.1%, significantly higher than that in the adjcent normal mucosa samples (46.7%, P = 0.001), and its overexpresion was closely correlated with T stage (Chi2 = 10.878, P = 0.004), clinical stage (Chi2 = 21.115, P < 0.01), metastasis (Chi2 = 28.298, P < 0.01) and recurrence (Chi2 = 14. 923, P = 0.001) in patients with LSCC. Patients with HMGB1 overexpression had both poorer disease-free survival and poorer overall survival compared with that in patients with low HMGB1 expression (Chi2 = 13.815, Chi2 = 11.912; Both P < 0.01). Univariate and multivariate Cox regression analyses revealed that HMGBI expression is an independent prognostic factor for patients with LSCC.</p><p><b>CONCLUSIONS</b>The results of this study demonstrate that HMGB1 protein expression is significantly increased in LSCC tissues, and HMGB1 protein overexpression is associated with a poorer prognosis in patients with LSCC. These results suggest that HMGB1 may play a critical role in the initiation and progression of LSCC, implicating HMGB1 may become a valuable marker for the prediction of prognosis in patients with LSCC.</p>

EGCG regulates TGF-β1-induced epithelial mesenchymal transition in squamous cell carcinoma of head and neck / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To study the effect and molecular mechanism of epigallocatechin-3-gallate (EGCG) on epithelial-mesenchymal transition (EMT) in vitro induced by human recombinant TGF-β1 protein in squamous cell carcinoma of the head and neck.</p><p><b>METHODS</b>EMT morphological changes of Tu686 cells were observed after sequential treatment of 5 ng/ml TGF-β1 and 20 µmol/L EGCG. Tu686 cells were collected after the treatment of 5 ng/ml TGF-β1 for 24 h and EGCG with different concentrations (0, 10, 20, 30 µmol/L) for another 24 h or 20 µmol/L EGCG treatment for different time phase (6, 12, 24 h). Then RT-PCR and Western-blot were applied to detect mRNA and protein expression level of epithelial cell marker E-cadherin, mesenchymal cell marker Vimentin and Smad7, an inhibit molecule of TGF-β1 mediated pathway in Tu686 cells.</p><p><b>RESULTS</b>TGF-β1 successfully induced characterized EMT morphological and molecular changes in Tu686 cells, in which expression of E-cadherin decreased, Vimentin increased and Smad7 declined. However, EGCG could reverse the TGF-β1 mediated process of EMT by downregulating the expression of Vimentin and upregulating the expression of E-cadherin and Smad7.</p><p><b>CONCLUSION</b>EGCG significantly inhibits TGF-β1-mediated EMT inTu686 cell lines of SCCHN, which maybe associated with the upregulated-expression of Smad7, an inhibitor in TGF-β1 signaling pathway.</p>

Correlation of EphA2 protein expression with clinicopathological characteristics and prognosis in laryngeal squamous cell carcinoma / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To evaluate the expression of EphA2 protein in tissue specimens and cell lines of laryngeal squamous cell carcinoma (LSCC), and to further study the correlation of EphA2 protein expression with clinicopathological characteristics and prognosis in LSCC.</p><p><b>METHODS</b>Western blot was applied to assess the EphA2 protein expression in LSCC cell line Hep-2 cells and the head and neck immortalized epithelial cell line NP-69 cells. Immunohistochemical staining was performed on paraffin sections of 88 cases of LSCC specimens and 16 cases of adjcent normal tissue samples to investigate the EphA2 protein expression, and to futher elucidate its correlation with clinicopathological characteristics.</p><p><b>RESULTS</b>Compared with the NP-69 cells, EphA2 expression in LSCC cell line Hep-2 cells was upregulated. The positive rates of EphA2 expression in LSCC and adjcent normal tissues samples were 80.7% and 43.8%, respectively, with a significant difference between the two groups (P < 0.001). EphA2 overexpresion was closely correlated with clinical stage (I + II/III + IV, P = 0.005), metastasis (P = 0.025) and recurrence (P = 0.021) in LSCC. Furthermore, patients with EphA2 overexpression had poorer tumor-free survival and 5-year overall survival compared with that in patients with low EphA2 expression (33.3% vs. 63.2%, P = 0.003; 46.7% vs. 81.6%, P = 0.002). EphA2 expression combined with clinical stage provided a better predictive value in prognosis. Univariate and multivariate Cox regression analysis revealed that EphA2 expression is an independent prognostic factor for patients with LSCC (P = 0.019).</p><p><b>CONCLUSIONS</b>The results of this study demonstrate that EphA2 protein expression is significantly increased in LSCC tissues and cell lines, and EphA2 protein overexpression is associated with tumor recurrence, metastasis and poorer prognosis in LSCC patients. These results suggest that EphA2 may play a critical role in the initiation and progression of LSCC, implicating EphA2 as a valuable marker for the prediction of recurrence, metastasis and prognosis in LSCC.</p>

Inhibition of cell growth by rapamycin through targeting mammalian target of rapamycin signaling pathway in nasopharyngeal carcinoma / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To study the effects of rapamycin on cell growth and cell cycle in CNE-1 and CNE-2 cells.</p><p><b>METHODS</b>Growth inhibition effect of rapamycin on CNE-1 and CNE-2 cells were assessed by cell counting kit-8 (CCK-8) assay. Morphological alterations of the cells were observed by microscope. Cell cycle and cell apoptosis were analyzed by FCM. The expression of mammalian target of rapamycin (mTOR) was analyzed by reverse transcription-polymerase chain reaction (RT-PCR).</p><p><b>RESULTS</b>The growth of CNE-1 and CNE-2 cells was inhibited significantly by rapamycin dose-dependently. FCM showed that CNE-1 and CNE-2 cells at 48 hours after rapamycin (150 nmol/L) treatment were arrested in the G0/G1 phase of cell cycle. However rapamycin treatment did not significantly induce apoptosis of CNE-1 and CNE-2 cells (P > 0.05). RT-PCR showed that rapamycin significantly inhibited mRNA expression of mTOR in CNE-2 cells (t = 10.625, P < 0.01).</p><p><b>CONCLUSIONS</b>Rapamycin inhibits the growth of CNE-1 and CNE-2 cells by inhibiting the progression of cell cycle, which could be achieved through decreasing the expression of mTOR.</p>

Alteration of gene expression during nasopharyngeal carcinogenesis revealed by oligonucleotide microarray after microdissection of tumor tissue and normal epithelia from nasopharynx / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Microarray and microdissection techniques were being used for many applications to study the carcinogenesis of some human tumors. But seldom studies had hitherto combined these two techniques to study carcinogenesis mechanism of nasopharyngeal carcinoma (NPC). To identify a set of genes involved in the carcinogenesis and development of NPC, we used the microdissected homogeneous NPC tissue cells and the pure normal epithelium pillar cells to construct the whole human genome expression profiles.</p><p><b>METHODS</b>We preserved the tissue samples from nasopharynx of 18 patients (including 13 samples of NPC and 5 samples of normal or inflammatory mucous tissue samples from nasopharynx) in RNAlater Stabilization Reagent. The tissue samples were microdissected to harvest the homogeneous tissue cells, then total RNA was isolated from them. The sufficient antisense RNA (aRNA) was amplified from these total RNA. HG-U133.Plus.2.0 GeneChip was used to construct the human whole genome expression profiling of each sample. Differential patterns of expression of genes correlated with the carcinogenesis, classification and progression of NPC were identified with comparing the expression profiling data respectively in leave one out cross-validation analysis. Correlation between aRNA expression measured by the microarrays and semi-quantitative reverse transcription polymerase chain reaction (sqRT-PCR) were also ascertained, and found that hybridization results were validated in all of the 18 patients.</p><p><b>RESULTS</b>Differential patterns of expression of 127 genes correlated with the carcinogenesis (A P value less than 0.001 with the 2-fold differentiated expression between case group and control group) of the NPC were filtered. The top most up-regulated and down-regulated 8 genes by the way of permutation test were also selected and listed in the paper. Expression of genes E2F6 and TSPAN-1 was identified using aRNA by sqRT-PCR and showed that there was significant difference between the average value of case groups and that of control group respectively (t = 2.170, df = 16, P = 0.045 and t = -2.946, df = 16, P = 0.009).</p><p><b>CONCLUSIONS</b>We had identified some genes which could be the molecular marker during the carcinogenesis and the development of the NPC. The genes which selected from the different subgroups seemed to be implicated for the diagnosis,classification, and progression of NPC, and provided important insights into their underlying biology.</p>

Global gene expression profiling of laryngeal squamous cell carcinoma by laser capture microdissection and complementary DNA microarrays / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To examine the gene expression profile of laryngeal squamous cell carcinoma (LSCC) by combination of laser capture microdissection (LCM) and microarray and to identify genetic changes in disease pathogenesis.</p><p><b>METHODS</b>The study analysed 8 matched pairs of specimens of glottic carcinoma of larynx and histologically normal epithelium tissues adjacent to the carcinoma preserved in the RNA later reagent. A genome-wide transcriptome analysis was performed by probing 16 cDNA microarrays with fluorescent-labeled amplified RNA derived from laser capture microdissected cells. Real-time quantitative (RT-PCR) of tissue microarray was used to validate the reliability of cDNA microarrays.</p><p><b>RESULTS</b>Significant analysis of microarray (SAM) software and hierarchical cluster analysis of the expressed genes showed that 2351 genes was significantly expressed respectively according to different analysis method (false discover rate = 0.63%). A selected set of MMP12, KRT16, RARB, PRB1 genes was identified to be consistent with array data by RT-PCR.</p><p><b>CONCLUSIONS</b>The analysis of gene ontology and pathway distributions futher highlighted genes that may be critically important to laryngeal carcinogenesis. The results strongly suggest that this new approach may facilitate the identification of clinical molecular markers of disease and novel potential therapeutic targets for LSCC.</p>

Killing effect of VP3 on human nasopharyngeal carcinoma cell line CNE-2 cells / 中南大学学报(医学版)

OBJECTIVE@#To investigate the killing effects of VP(3) on nasopharyngeal carcinoma cell line CNE-2.@*METHODS@#Plasmid expression vector pcDNA3.1(-) CMV.VP(3)-His was constructed and identified by Kpn I/EcoR I endonuclease analysis, and then sequenced to verify successful insertion in the sense direction of VP(3) gene. pcDNA3.1(-) CMV.VP(3)-His and pcDNA3.1(-)-His expression plasmid was transiently transfected into nasopharyngeal carcinoma cell line CNE-2 . VP(3) protein expression was detected by Western blotting. MTT assay was used to determine the killing effects of VP(3) gene on nasopharyngeal carcinoma cell line CNE-2.@*RESULTS@#Endonuclease analysis and sequencing confirmed the recombinant plasmid contained the complete VP(3) CDS sequence. Western blotting detected a 14.03 kD protein expression from the transfected cells, which was the expecting band of VP(3) gene. The growth of CNE-2 cells that expressed VP(3) gene was inhibited,while the growth of CNE-2 cells that did not express VP(3) gene was not inhibited.@*CONCLUSION@#VP(3) gene can kill nasopharyngeal carcinoma cell CNE-2.

Clinical analysis of 170 cases head and neck lymphoma / 中南大学学报(医学版)

OBJECTIVE@#To study the characteristics of head and neck lymphoma in order to improve its diagnose rate.@*METHODS@#Review and analysis 170 patients with head and neck lymphoma in department of otolaryngology of Xiangya hospital from 1997 to 2005.@*RESULTS@#Nasal cavity and nasal sinuses, neck, tonsil were the common place of the origin of head and neck lymphoma. There are 9 cases Hodgkin disease and 161 cases non-Hodgkin lymphoma (NHL). T cellularity, B cellularity lymphoma, the mixed pattern and nullityping accounted for 60.9%, 36.0% and 3.1% of these patients with NHL, respectively. CHOP and radiotherapy were the main treatment method.@*CONCLUSION@#The clinical and imageology manifestation of head and neck lymphoma were of diversification and no specificity, whose final diagnosis depended on immunohistochemistry.

Expression of NASG gene and its role in human nasopharyngeal homogenous tissue cells / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>The NASG gene has been confirmed as a tumor-suppressor gene candidate related to nasopharyngeal carcinoma (NPC) by previous studies. We further investigated the expression and the role of NASG in the homogeneous tissue cells by microdissecting the samples of tissue from human NPC, and introduced a new way to study the expression of specific genes in tumor tissue.</p><p><b>METHODS</b>The RNAlater reagent was used to preserve the samples of tissue from the nasopharynx of NPC patients. The samples were microdissected to harvest the homogeneous tissue cells and then total RNA was isolated from them. The antisense RNA (aRNA) was amplified from the total RNA by "in vitro transcription (IVT)". We investigated NASG expression in the homogeneous tumor cells of NPC (22 samples) and compared it with that in the pure epithelial pillar cells of normal nasopharyngeal (10 samples) by semi-quantitative reverse transcription-polymerase chain reaction (sqRT-PCR).</p><p><b>RESULTS</b>The high quality total RNA could be harvested from the microdissected homogeneous tissue cells of the nasopharynx, then sufficient aRNA was derived from it. NASG gene expression was identified using aRNA by sqRT-PCR and showed that there was significant difference between the average value of case groups and that of control group (t = -5.275, df = 30, P < 0.001). The NASG gene in the subgroups WHOII tended to express lower levels than those in the subgroup WHOIII although this difference was not statistically significant (t = -1.584, df = 20, P = 0.129 > 0.05).</p><p><b>CONCLUSIONS</b>Microdissection was an effective method to obtain the homogeneous tissue cells of nasopharyngeal tissue (including the samples of NPC and non-NPC) in our study. Sufficient aRNA from amplifying total RNA could be used in sqRT-PCR to analyse the expression of NASG in the pure tissue cells. NASG should be a tumor-suppression gene candidate regarding to NPC.</p>

Preliminary biomarker related to nasopharyngeal carcinoma filtered from the whole genome expression profiling involved in microdissection nasopharyngeal tissues / 中南大学学报(医学版)

OBJECTIVE@#To filter biomarkers of nasopharyngeal carcinoma (NPC) by constructing the homogenesis tissue gene expression profiling with the whole human genome GeneChip.@*METHODS@#The epithelium cells of the homogenesis NPC and the pure nasopharyngeal normal tissues microdissected from nasopharyngeal biopsy which was preserved in the RNAlater were used to isolate RNA and then to harvest the aRNA through in vitro transcription, and aRNA prober was labled to hybridize to HG-U133. plus 2.0, so the expression profiling of each homogenesis tissue could be constructed.@*RESULTS@#Some candidate biomarker genes related to the tumorigenesis of NPC had been filtered by comparing the expression profiling of NPC samples with the expression profiling of normal nasopharyngeal epithelia samples. Any genes regarding the metastasis of NPC might have been selected by comparing the expression profiling of no-metastasis samples with those of the metastasis samples.@*CONCLUSION@#Using the whole genome GeneChip to construct the expression profiling for the microdissected homogenesis tissue is effective to filter the candidate biomarker genes.

Primary functional analysis of CK13 gene 5' flanking region / 中华医学遗传学杂志

<p><b>OBJECTIVE</b>To investigate the mechanism of cytokeratin 13 (CK13) gene expression control and the effects of different motifs of CK13 gene 5' flanking region on its transcriptional activity.</p><p><b>METHODS</b>The molecular clone technique and reporter gene analysis were used to assay the effects of different motifs of 513 bp of CK13 gene 5' flanking region on its transcriptional activity. The pCAT enhancer vectors with different motifs of CK13 gene 5' flanking region were constructed and transferred to HeLa cells with the help of lipofectin. The instant CAT expression of different clones was detected and the effects of different motifs of the CK13 gene 5' flanking region on its transcriptional activity were evaluated.</p><p><b>RESULTS</b>119 bp from -nt.325 to -nt.207 upstream of the first ATG of CK13 gene 5' flanking region included a silent element. 113 bp region from -nt.206 to -nt.94 included an enhanced element.</p><p><b>CONCLUSION</b>513 bp of CK13 gene 5' flanking region includes a silent element and an enhanced element. Further locating these cis elements and detecting the related trans reaction factors may unveil some important clues to the details of the mechanisms for the CK13 gene expression and tissue-specific expression.</p>