Lung Adenocarcinoma Cell Lines H1299 Research Articles

Usenamine A triggers NLRP3/caspase-1/GSDMD-mediated pyroptosis in lung adenocarcinoma by targeting the DDX3X/SQSTM1 axis.

Usenamine A (C18H17NO6) is a newly developed, natural anticancer drug that reportedly exerts low toxicity. The therapeutic efficacy and underlying mechanisms of usenamine A in lung adenocarcinoma (LUAD) remain poorly understood. We aimed to explore the therapeutic effects and molecular mechanisms through which usenamine A inhibits LUAD tumorigenesis. We used LUAD cell lines H1299 and A549 in the present study. CCK-8 and colony formation assays were performed to analyze cell proliferation. Cell migration, invasion, and apoptosis were evaluated using wound-healing, transwell, and flow cytometric assays, respectively. Levels of reactive oxygen species were measured using a DCFH-DA probe. Inflammatory factors (lactate dehydrogenase, interleukin [IL]-1β, and IL-18) were detected using enzyme-linked immunosorbent assays. Western blotting was performed to determine the expression of NOD-like receptor pyrin 3 (NLRP3)/caspase-1/gasdermin D (GSDMD) pathway-related proteins. Pyroptosis was detected using transmission electron microscopy. The interaction and co-localization of DDX3X and sequestosome 1 (SQSTM1) were identified using co-immunoprecipitation and immunofluorescence assays, respectively. For in vivo assessment, we established a xenograft model to validate the usenamine A-mediated effects and mechanisms of action in LUAD. Usenamine A inhibited the proliferation, migration, and invasion of LUAD cells. Furthermore, usenamine A induced NLRP3/caspase-1/GSDMD-mediated pyroptosis in LUAD cells. Usenamine A upregulated DDX3X expression to trigger pyroptosis. DDX3X interacted with SQSTM1, which is responsible for inducing pyroptosis. In vivo, usenamine A suppressed LUAD tumorigenesis by triggering NLRP3/caspase-1/GSDMD-mediated pyroptosis via the upregulation of the DDX3X/SQSTM1 axis. Usenamine A was found to induce NLRP3/caspase-1/GSDMD-mediated pyroptosis in LUAD by upregulating the DDX3X/SQSTM1 axis.

Cyclic adenosine monophosphate/phosphodiesterase 4 pathway associated with immune infiltration and PD-L1 expression in lung adenocarcinoma cells.

BackgroundThe cyclic adenosine monophosphate/phosphodiesterase 4 (cAMP/PDE4) pathway is involved in inflammation and immune regulation; however, the effect of cAMP/PDE4 on immune infiltration and immune evasion in lung adenocarcinoma (LUAD) remains unclear.MethodsCBioPortal, which is the The Cancer Genome Atlas (TCGA) online database, and the Kaplan Meier plotter were used to analyze the association between genes and the prognosis of TCGA-LUAD. Tumor Immune Estimation Resource (TIMER) was used to analyze the association between gene expression and immune infiltration. The Genecards database was used to identify the transcription factors of related genes. The lung adenocarcinoma cell line H1299 and A549 were treated with cAMP pathway drugs. Flow cytometry and qRT-PCR were used to detect the PD-L1 protein and gene expression, respectively. A one-way analysis of variance with Tukey’s post-hoc test or a Student’s t-test were used.ResultsIt was found that PDE4B and CREB1, which are downstream genes of the cAMP/PDE4 axis, were differentially expressed in LUAD and adjacent tissues and are correlated with the prognosis and immune infiltration of LUAD. In the CBioPortal database, cAMP pathway genes are closely related to programmed cell death-ligand 1 (PD-L1) expression in TCGA-LUAD. The protein-protein interaction revealed that there was a direct interaction between CREB1/CREBBP, which are the downstream molecules of the cAMP/PDE4 axis, and MYC; additionally, MYC was predicted to bind to the PD-L1 transcription site and regulate PD-L1 expression. CREB1 was also predicted to transcriptionally bind to both MYC and PD-L1. These results predicted the interaction network of cAMP/PDE4/CREB1/CREBP/MYC/PD-L1, and the core factor may be related to MYC. In the cell experiment, forskolin (an adenylate cyclase activator) and zardaverine (a PDE4 inhibitor) enhance the cAMP pathway and decrease PD-L1 expression, while SQ2253 (an adenylate cyclase inhibitor) inhibits the cAMP pathway and increases PD-L1 expression of the LUAD cell lines H1299 and A549, and MYC regulation by these drugs was positively correlated with PD-L1 regulation, which verified the regulation of the cAMP/PDE4 pathway on MYC and PD-L1.ConclusionsThis study showed that the cAMP/PDE4 pathway may play an important role in PD-L1 regulation and immune infiltration in LUAD.

MiR-31-5p modulates cell progression in lung adenocarcinoma through TNS1/p53 axis.

To clarify the modulatory mechanism of miR-31-5p in lung adenocarcinoma (LUAD) progression in vivo and in vitro. The Cancer Genome Atlas (TCGA) database was employed to access LUAD-related miRNA and mRNA expression data. Downstream targets of miR-31-5p were predicted by public databases. The interaction between miR-31-5p and TNS1 was determined by dual-luciferase reporter assay. Quantitative real-time polymerase chain reaction (qRT-PCR) was utilized to measure miR-31-5p and TNS1 expression levels in LUAD cells. Western blot was introduced to test protein expression levels of TNS1, p53, and apoptosis-related proteins. In-vitro functional assays were conducted to evaluate the biological effects of miR-31-5p on cell proliferation, colony formation, migration, and apoptosis. In-vivo tumor xenograft experiment was applied to examine the effects of miR-31-5p on LUAD tumor growth, followed by immunochemistry assays for assessing TNS1 and p53 expression levels in the tumor tissue. miR-31-5p was prominently upregulated in LUAD tissue and was identified to present asimilar trend in LUAD cell lines H1299, H23, and A549. miR-31-5p overexpression exerted an active role in cell proliferation and migration, but it suppressed cell apoptosis. Additionally, areverse correlation between miR-31-5p and TNS1 regarding the expression level was identified, and TNS1 was verified to be adirect target of miR-31-5p. Besides, it was further validated by the rescue experiments that the tumor-promoting effects of miR-31-5p on LUAD cell functions were attenuated by TNS1 overexpression to some extent. The results based on the tumor xenograft experiment revealed that LUAD cell growth could be facilitated by miR-31-5p via the TNS1/p53 axis. miR-31-5p facilitates LUAD cell progression mediated by the TNS1/p53 axis.

Effect of Mir-299-3p on the biological function of lung adenocarcinoma cell H1299 through targeting PTPRD

The paper aimed to investigate the effects of up-regulation and down-regulation of Mir-299-3p on the proliferation, migration, invasion and apoptosis of lung adenocarcinoma cell line H1299, and to preliminarily explore the mechanism of Mir-299-3p regulating the biological behavior of lung adenocarcinoma cells. Mir-299-3p inhibitor and Mir-299-3p mimics were transfected into lung adenocarcinoma cell line H1299, and the transfection efficiency was measured by fluorescence microscopy. The successfully transfected lung adenocarcinoma cells were detected of proliferation, migration, invasion, and apoptosis. Mir-299-3p inhibitor and Mir-299-3p mimics were used to down-regulate and up-regulate Mir-299-3p respectively. Western blot was employed to detect the expressions of STAT3, p-STAT3, caspase3, Bcl-2, Bax and MMP-9 proteins in lung adenocarcinoma cells. Small interfering RNA technology was applied to construct a cell line with low expression of PTPRD. WB was used to measure the transfection efficiency to determine whether the down-regulation of PTPRD can partially or completely reverse the proliferation, migration, invasion, and apoptosis of lung adenocarcinoma cells after the down-regulation of Mir-299-3p. It was also determined whether the down-regulation of PTPRD can partially or completely reverse the effect of Mir-299-3p down-regulation on the expressions of p-STAT3, MMP-9, Cleaved-caspase3, Bcl-2 and Bax proteins in lung adenocarcinoma cells. Down-regulation of Mir-299-3p can inhibit the proliferation and invasion of lung adenocarcinoma cell H1299, promote cell apoptosis, inhibit the expression of p-STAT3 and MMP-9, promote the expressions of apoptosis-inducing proteins such as Bax and Cleaved-caspase3, and also inhibit the expression of apoptosis inhibitor protein Bcl-2. The up-regulation of Mir-299-3p worked in the opposite way. PTPRD is the direct target gene of Mir-299-3p. Mir-299-3p may directly target PTPRD to regulate the expressions of p-STAT3, MMP-9, Cleaved-caspase3, Bcl-2 and Bax proteins to affect the biological behavior of lung adenocarcinoma cells.

A Model System to Explore the Detection Limits of Antibody-Based Immuno-SPECT Imaging of Exclusively Intranuclear Epitopes.

Imaging of intranuclear epitopes using antibodies tagged to cell-penetrating peptides has great potential given its versatility, specificity, and sensitivity. However, this process is technically challenging because of the location of the target. Previous research has demonstrated a variety of intranuclear epitopes that can be targeted with antibody-based radioimmunoconjugates. Here, we developed a controlled-expression model of nucleus-localized green fluorescent protein (GFP) to interrogate the technical limitations of intranuclear SPECT using radioimmunoconjugates, notably the lower target-abundance detection threshold. Methods: We stably transfected the lung adenocarcinoma cell line H1299 with an enhanced GFP (EGFP)-tagged histone 2B (H2B) and generated 4 cell lines expressing increasing levels of GFP. EGFP levels were quantified using Western blot, flow cytometry, and enzyme-linked immunosorbent assay. An anti-GFP antibody (GFP-G1) was modified using dibenzocyclooctyne-N3-based strain-promoted azide-alkyne cycloaddition with the cell-penetrating peptide TAT (GRKKRRQRRRPPQGYG), which also includes a nuclear localization sequence, and the metal ion chelator N3-Bn-diethylenetriamine pentaacetate (DTPA) to allow radiolabeling with 111In. Cell uptake of 111In-GFP-G1-TAT was evaluated across 5 cell clones expressing different levels of H2B-EGFP invitro. Tumor uptake in xenograft-bearing mice was quantified to determine the smallest amount of target epitope that could be detected using 111In-GFP-G1-TAT. Results: We generated 4 H1299 cell clones expressing different levels of H2B-EGFP (0-1 million copies per cell, including wild-type H1299 cells). GFP-G1 monoclonal antibody was produced and purified in house, and selective binding to H2B-EGFP was confirmed. The affinity (dissociation constant) of GFP-G1 was determined as 9.1 ± 3.0 nM. GFP-G1 was conjugated to TAT and DTPA. 111In-GFP-G1-TAT uptake in H2B-EGFP-expressing cell clones correlated linearly with H2B-EGFP expression (P < 0.001). In vivo xenograft studies demonstrated that 111In-GFP-G1-TAT uptake in tumor tissue correlated linearly with expression of H2B-EGFP (P = 0.004) and suggested a lower target-abundance detection threshold of approximately 240,000 copies per cell. Conclusion: Here, we present a proof-of-concept demonstration that antibody-based imaging of intranuclear targets is capable both of detecting the presence of an epitope of interest with a copy number above 240,000 copies per cell and of determining differences in expression level above this threshold.

Modelling of SHMT1 riboregulation predicts dynamic changes of serine and glycine levels across cellular compartments

Human serine hydroxymethyltransferase (SHMT) regulates the serine-glycine one carbon metabolism and plays a role in cancer metabolic reprogramming. Two SHMT isozymes are acting in the cell: SHMT1 encoding the cytoplasmic isozyme, and SHMT2 encoding the mitochondrial one. Here we present a molecular model built on experimental data reporting the interaction between SHMT1 protein and SHMT2 mRNA, recently discovered in lung cancer cells. Using a stochastic dynamic model, we show that RNA moieties dynamically regulate serine and glycine concentration, shaping the system behaviour. For the first time we observe an active functional role of the RNA in the regulation of the serine-glycine metabolism and availability, which unravels a complex layer of regulation that cancer cells exploit to fine tune amino acids availability according to their metabolic needs. The quantitative model, complemented by an experimental validation in the lung adenocarcinoma cell line H1299, exploits RNA molecules as metabolic switches of the SHMT1 activity. Our results pave the way for the development of RNA-based molecules able to unbalance serine metabolism in cancer cells.

EPHA5 mutations predict survival after immunotherapy in lung adenocarcinoma.

Eph receptors constitute the largest family of RTKs, and their associations with antitumor immunity and immunotherapy are largely unknown. By integrating genomic, transcriptomic and clinical data from cohorts in public databases, we identified EPHA5 as the most common mutated gene of Eph receptors in lung adenocarcinoma (LUAD). Moreover, compared with EPHA5 wild-type (WT) patients, EPHA5-mutant (Mut) patients exhibited significantly enhanced infiltration of CD8+ T cells and M1 macrophages, reduced recruitment of immunosuppressive regulatory T cells (Tregs) into the tumor site, as well as the increased level of chemokine, interferon-gamma, inhibitory immune checkpoint signatures, tumor mutation burden (TMB) and tumor neoantigen burden (TNB). Additionally, EPHA5 mutation cooccurred with homologous recombination (HR) or mismatch repair (MMR) gene mutations. These data were validated in the LUAD cell line H1299 and a Chinese LUAD cohort. Most importantly, clinical analysis of a Memorial Sloan Kettering Cancer Center (MSKCC) immunotherapy cohort indicated that LUAD patients with EPHA5 mutations who were treated with immunotherapy had markedly prolonged survival times.Our results revealed the correlation of EPHA5 mutations with tumor immune microenvironment and predictive factors for immunotherapy, implying the potential of EPHA5 mutations as a prognostic marker for the prognosis of LUAD patients to immune checkpoint blockade therapy.

Sodium Butyrate Combined with Docetaxel for the Treatment of Lung Adenocarcinoma A549 Cells by Targeting Gli1.

PurposeThis study is aimed to investigate the combined treating efficacy of sodium butyrate and docetaxel on proliferation and apoptosis of the lung adenocarcinoma A549 cell line based on Gli1 regulation in vitro and in vivo.Materials and MethodsRNA interference method was used to overexpress Gli1 in A549 cells. Cells were treated with varying concentrations of sodium butyrate, docetaxel or both in combination. CCK-8, colony formation assay, Hoechst 33258 staining, flow cytometry and TUNEL assay were employed to detect proliferation, cell cycle and apoptosis. qRT-PCR and Western blot analysis were applied to detect the mRNA and protein expression of Gli1. In vivo tumorigenicity was detected by tumor transplantation in nude mice. Downstream protein levels of Gli1 were detected using Western blot assay.ResultsIt was found that sodium butyrate or docetaxel alone, respectively, inhibited proliferation and promoted apoptosis of A549 cells in vitro and in vivo, while the combination of the two generated significantly higher responses, which were also effective in another lung adenocarcinoma cell line H1299. Furthermore, the combined therapy had an additive effect in suppressing Gli1 expression and regulating the expression of its downstream proteins that involve in proliferation, cell cycle and apoptosis of A549 cells in vitro and in vivo, including decreased protein expression of Ki-67, CDK1, CDK2, Cyclin D1, Bcl-2 and Survivin, and increased protein expression of Cyclin A, p21, Bax and cleaved-Caspase 3. On the other hand, Gli1 overexpression perceptibly reversed the above-mentioned additive effect in vitro and in vivo.ConclusionThis study demonstrates that the combined therapy of sodium butyrate and docetaxel additively inhibits proliferation and promotes apoptosis of A549 lung adenocarcinoma cells via suppressing Gli1 expression in vitro and in vivo. Targeting Gli1 by the combined therapy may provide new insights into the therapeutic management of patients with lung adenocarcinoma.

P2.03-49 Roles of CENPU in Lung Adenocarcinoma Progression and Invasion

Centromere protein U (CENPU), a centromere protein mediating kinetochore-microtubule interaction, is critical for proper cell cycle and mitosis. It has been implicated that CENPU promotes tumorigenesis in variant malignancies. However, roles of CENPU in lung adenocarcinoma progression and underlying mechanisms remain to be elucidated. CENPU expression in 90 pair lung adenocarcinoma/adjacent normal lung samples was examined with immunohistochemistry (IHC). Then CENPU expression was inhibited with lentiviral-mediated shRNA strategy in human lung adenocarcinoma cell line H1299 to examine the impact of CENPU knockdown for lung adenocarcinoma progression and metastasis. Cell proliferation, colony formation, cell cycle and cell survival were analyzed by Cellomics cell counting method, colonogenesis assay, PI and Annexin V-APC staining respectively while cellular migration and invasion were determined by cell scratch and transwell test. Furthermore, expression of critical factors involved in epithelial-to-mesenchymal transition (EMT) were determined with western blot. CENPU expression was significantly increased in lung adenocarcinomas as compared to adjacent normal lung tissues (fold change=8.54, P<0.0001) (Fig. 1A). Functionl analysis revealed that in human lung adenocarcinoma cell line H1299, CENPU knockdown impaired cell proliferation (Fig. 1B), inhibited colony formation ability (Fig. 1C) and induced cell cycle arrest (Fig. 1D). Additionally, cellular migration and invasion was also inhibited by CENPU knockdown (Fig. 1E-F). It is further shown that E-Cadherin was induced while N-Cadherin and vimentin were inhibited by CENPU knockdown (Fig. 1G), indicating that CENPU was important for EMT process and cancer metastasis. It showed that CENPU expression is significantly upregulated lung adenocarcinoma tissue. Functional analysis indicated that CENPU is critical for cell proliferation, survival, migration and metastasis in lung adenocarcinoma cell line H1299. CENPU represents a promising target for lung adenocarcinoma therapy.

Mechanism of VIPR1 gene regulating human lung adenocarcinoma H1299 cells.

The vasoactive intestinal peptide receptor-1(VIPR1) has prominent growth effects on a number of common neoplasms. However, there were contradictions in the effect cross different cancers. We aimed to explore the effect of VIPR1 overexpression on a human lung adenocarcinoma cell line H1299. GEO dataset was used to screen differentially expressed genes in lung adenocarcinoma tissues. The expression of VIPR1 mRNA was determined in the cancer Genome Atlas (TCGA). Immunohistochemical analysis was performed to determine VIPR1 protein expression in lung adenocarcinoma and corresponding adjacent tissues (n = 22). Fluorescence real-time quantitative PCR detected the expression of VIPR1 in human normal lung epithelial cell line BEAS-2B and lung adenocarcinoma cell line H1299. Overexpression strategies were employed to assess functions of VIPR1 expression on several malignant phenotypes in H1299. The expression of VIPR1 was lower in lung adenocarcinoma tissues than that in adjacent tissues. Compared with the normal lung epithelial cells BEAS-2B, VIPR1 was down-regulated in lung cancer cells H1299 (P < 0.05). After the overexpression of VIPR1, we found that VIPR1 significantly inhibited growth, migration, and invasion of H1299 cells (P < 0.05). Our findings point out the tumor suppressor roles of VIPR1 in human LUAD pathogenesis.

Δ133p53 decreases the chemosensitivity of carcinoma cell line H1299.

The research evaluated the effect of Δ133p53 on the chemosensitivity of lung adenocarcinoma cell line H1299. By this study, the drug-resistant molecular marker and a new target for cancer therapy could be provided. Δ133p53 or negative control plasmid were transferred into H1299 cells by lentivirus vector. The expression of Δ133p53 in transfected cells was examined using immunofluorescence. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazoliumbromide (MTT) method and colony formation test were applied to detect drug sensitivity after cisplatin or 5-fluorouracil (5-FU) treatment. After cisplatin (CDDP)/FU treatment, MTT assay demonstrated that the inhibition rate of H1299/Δ133p53 cell was reduced compared with that of the H1299 and H1299/NEG cells at the same concentration of drug. The 50% inhibitory concentrations (IC 50 ) of CDDP and 5-FU rose by 36.1 and 30.2%, respectively (P < 0.05). The colony formation assay suggested that the cell proliferation ability of H1299/Δ133p53 cell was prominently increased when compared with that of control group H1299 and H1299 /NEG cells (P < 0.05). The present study demonstrated that the transfection of the Δ133p53 gene in H1299 cells led to the reduction of chemosensitivity.

Silencing Aurora-A with siRNA inhibits cell proliferation in human lung adenocarcinoma cells.

Aurora kinase A (AURKA) is an oncogenic serine/threonine kinase, it plays important roles in tumorigenesis and chemoresistance. In this study, we investigated the expression of AURKA in lung adenocarcinoma tissues, the role of small interference RNA targeting AURKA on growth, cell cycle, and apoptosis of lung adenocarcinoma cell lines invitro. The AURKA is highly expressed in lung adenocarcinoma tissues and human lung adenocarcinoma cell lines. Lentivirus-mediated short hairpin RNA (shRNA) was used to knock down AURKA expression in human lung adenocarcinoma cell lines H1299 and A549. The results indicated that depletion of AURKA could inhibit cell growth, cause cell cycle arrest and apoptosis. The potential mechanisms of AURKA inhibition induced cell cycle arrest and apoptosis are associated with downregulated RAF-1, CCND2, CCND3, CDK4, PAK4, EGFR and upregulated WEE1 expression. Furthermore, AURKA knockdown cooperated with vincristine (VCR) to repress A549 cell proliferation. Therefore, AURKA plays important roles in the proliferation of human lung adenocarcinoma cells, which suggests that AURKA could be a promising tool for lung adenocarcinoma therapy.

β-PIX controls intracellular viscoelasticity to regulate lung cancer cell migration.

Cancer metastasis occurs via a progress involving abnormal cell migration. Cell migration, a dynamic physical process, is controlled by the cytoskeletal system, which includes the dynamics of actin organization and cellular adhesive organelles, focal adhesions (FAs). However, it is not known whether the organization of actin cytoskeletal system has a regulatory role in the physiologically relevant aspects of cancer metastasis. In the present studies, it was found that lung adenocarcinoma cells isolated from the secondary lung cancer of the lymph nodes, H1299 cells, show specific dynamics in terms of the actin cytoskeleton and FAs. This results in a higher level of mobility and this is regulated by an immature FA component, β-PIX (PAK-interacting exchange factor-β). In H1299 cells, β-PIX's activity was found not to be down-regulated by sequestration onto stress fibres, as the cells did not bundle actin filaments into stress fibres. Thus, β-PIX mainly remained localized at FAs, which allowed maturation of nascent adhesions into focal complexes; this resulted in actin polymerization, increased actin network integrity, changes in the intracellular microrheology at the peripheral of the cell, and cell polarity, which in turn regulated cell migration. Perturbation of β-PIX caused an inhibition of cell migration, including migration velocity, accumulated distance and directional persistence. Our results demonstrate the importance of β-PIX to the regulation of high mobility of lung adenocarcinoma cell line H1299 and that this occurs via regulation of FA dynamics, changes in actin cytoskeleton organization and cell polarity.

Hypoxic-inducible factor-1α might up-regulate matrix metalloproteinase in subclones that survive 10-Gy X-irradiation

To the best of our knowledge, most studies of irradiation effects on cells have focused on early responses, such as RNA expression and protein levels a few hours later or days after irradiation. Of course, it is important to understand how cells respond to irradiation immediately after exposure. However, most cells die if a large dose is given (e.g., 10 Gy, which is now commonly used for lung cancer). To understand the nature of the surviving cells is probably much more relevant to the clinical situation in terms of residual disease or local recurrence. Here we discuss matrix metalloproteinase 1 (MMP1) in relation with hypoxic inducible factor 1α (HIF-1α). The reasons we focused on these molecules were (1) in our previous experiments using lung carcinoma cell lines, MMP1 mRNA was up-regulated in subclones that survived 10 Gy (data not shown); and (2) recently, several studies have shown that HIF-1α up-regulates MMP1 expression. In the present experiment, we fi rst established irradiation-surviving H1299 cells (referred to as H1299-IR). Semi-confl uent H1299 cells were irradiated with 10 Gy and were soon seeded onto a 3-cm culture dish. Twelve days later, all the colonies were harvested, and the cells were stored at −80°. The parent cells were derived from the lung adenocarcinoma cell line H1299. To examine the invasiveness of each cell line, a collagen overlay assay was performed. For this, 1 × 10 cells were seeded into a collagen-fi lled cultured dish. The details of the threedimensional (3D) cell culture are described elsewhere. Cells were allowed to proliferate sterically for 12 days. In this experiment, 95 colonies were observed for H1299 and 116 for H1299-IR. Colonies were classifi ed into “spheroid” and “nonspheroid” (Fig. 1). Of the 95 H1299 colonies, 25 (26.3 %) took on a nonspheroid shape, whereas 87 (75.0 %) the 116 H1299-IR colonies were nonspheroid-like (chisquared test, P < 0.01). This result is consistent with the report showing 10 Gy-surviving malignant cells had a tendency to take on an irregular shape and had a highly invasive nature. We then performed the MMP1 luciferase assay. The promoter regions included E-box, Ets, and AP1 sites so the promoter activities of pcDNA (as a control) E1AF, Jun/Fos, and HIF-1α could be measured. The construct is shown in Fig. 2a. The luciferase assay for E1AF, Jun/ Fos, and HIF-1α revealed the following fold changes, with the SD, compared to the control, pcDNA, for H1299 cells: E1AF (1.9 ± 0.1), Jun/Fos (5.6 ± 0.2), and HIF-1α (0.8 ± 0.2), respectively. A statistically signifi cant value was observed for Jun/Fos (Student’s t-test, P < 0.01). On the other hand, the respective values for H1299-IR were E1AF (2.2 ± 0.1), Jun/Fos (2.7 ± 0.3), and HIF-1α (3.3 ± 0.2). These results are shown in Fig. 2b. Statistically signifi cant values of P ≤ 0.01 were seen for all transcriptional factors for H1299-IR. Paying attention to their initial (i.e., control) status, 4.6-fold higher MMP1 promoter activity was observed for H1299-IR. On cDNA array analysis, MMP1 mRNA was up-regulated 4.4-fold, similar to the value on the luciferase assay. Silva et al. performed an immunohistochemical study on oropharyngeal carcinoma and found that high HIF-1α staining was well correlated with a poor Received: June 3, 2010 / Accepted: October 7, 2010 © Japan Radiological Society 2011

Synergistic effects of hyperthermia and cisplatin on human lung adenocarcinoma cell line H1299

Objective To observe the synergistic effects of hyperthernia and cisplatin on human lung adenocarcinoma cell line H1299.

P-035 Enhanced chemosensitivity with p73α gene transfer in human lung adenocarcinoma cell line H1299

P-035 Enhanced chemosensitivity with p73α gene transfer in human lung adenocarcinoma cell line H1299