Treatment with ALK tyrosine kinase inhibitors often elicits profound initial antitumor responses in ALK fusion-positive patients with lung adenocarcinoma. However, patients invariably develop acquired resistance to ALK inhibitors. In this study, we aimed to identify molecular events that limit the durable response to ALK inhibition using genetic and epigenetic approaches. To identify novel mechanisms of acquired resistance to ALK inhibitors, we established in vivo and in vitro models of acquired resistance to ceritinib and crizotinib using H3122 and H2228 cells. For in vivo model, mice with established H3122-derived tumors were treated with four doses of ceritinib (50mg/kg, 75mg/kg, 87.5mg/kg, 100mg/kg) to derive ceritinib-resistant tumors.
Enhancer Remodeling and MicroRNA Alterations Are Associated with Acquired Resistance to ALK Inhibitors.
Cell line
View SamplesMicroarrays were used to examine the ability of anti-PD-1 and/or temozolomide to reprogram transcriptional profiles. Samples were obtained from tumor mass formed by orthotopic implantation of GL261 cells.
No associated publication
Specimen part, Treatment
View SamplesIdentify gene expression patterns of different neural precursor cells derived from human embryonic stem cells.
PSA-NCAM-negative neural crest cells emerging during neural induction of pluripotent stem cells cause mesodermal tumors and unwanted grafts.
Specimen part, Cell line
View SamplesTo identify the immunological status of the persistent and chronic stages, we analysed immunological genes in lung tissues from mice infected with M. tuberculosis. Based on the cDNA microarray results, 11 candidate cytokine genes, which were obviously up-regulated during the chronic stage compared with those during the persistent stage, were selected and clustered into three groups: 1) chemokine genes, except those of monocyte chemoattractant proteins (MCPs) (CXCL9, CXCL10, CXCL11, CCL5, CCL19); 2) MCP genes (CCL2, CCL7, CCL8, CCL12); and 3) TNF and IFN- genes. Results from the cDNA microarray and quantitative RT-PCR analyses revealed that the mRNA expression of the selected cytokine genes was significantly higher in lung tissues of the chronic stage than of the persistent stage. Three chemokines (CCL5, CCL19 and CXCL9) and three MCPs (CCL7, CCL2 and CCL12) were noticeably increased in the chronic stage compared with the persistent stage.
No associated publication
Sex, Specimen part
View SamplesPseudomonas aeruginosa undergoes cell elongation and forms robust biofilms during anaerobic respiratory growth using nitrate (NO3-) as an alternative electron acceptor. Understanding the mechanism of cell shape change induced upon anaerobiosis is crucial to the development of effective treatments against P. aeruginosa biofilm infection. Anaerobic growth of PAO1 reached higher cell density in the presence of vitamin B12, an essential coenzyme of class II ribonucleotide reductase. In addition, cell morphology returned to a normal rod shape. These results suggest that vitamin B12, the production of which was suppressed during anaerobic growth, can restore cellular machineries for DNA replication and therefore facilitate better anaerobic growth of P. aeruginosa with normal cell division.
Vitamin B12-mediated restoration of defective anaerobic growth leads to reduced biofilm formation in Pseudomonas aeruginosa.
No sample metadata fields
View SamplesThe genetic mechanism governing the spatial patterning of teeth still remains to be elucidated. Sonic hedgehog (Shh) is one of key signaling molecules involved in the spatial patterning of teeth. By utilizing maternal transfer of 5E1 (an IgG1 monoclonal antibody against Shh protein) through the placenta to block Shh signaling, we investigated the changes in tooth patterning and in gene expression.
Interactions between Shh, Sostdc1 and Wnt signaling and a new feedback loop for spatial patterning of the teeth.
Specimen part, Time
View SamplesThe aim of this study was to evaluate and compare the gene expression profiles of dental follicle and periodontal ligament in humans, which can possibly explain their functions of dental follicle and PDL such as eruption coordination and stress resorption. That may apply this information to clinical problem like eruption disturbance and to periodontal tissue engineering.
Comparative gene-expression analysis of the dental follicle and periodontal ligament in humans.
Specimen part
View SamplesHuman deciduous and permanent teeth exhibit different developmental processes, morphologies, histological characteristics and life cycles. In addition their pulp tissues react differently to external stimuli, such as the pulp sensitivity test, dental trauma and pulp therapy materials. These differences are attributable to their genetic backgrounds. Therefore the purpose of this study is to compare the differences of dental pulp in deciduous and permanent teeth.
Distinctive genetic activity pattern of the human dental pulp between deciduous and permanent teeth.
Specimen part
View SamplesWe performed this study to compare the gene expression pattern between coronal pulp and apical pulp complex
Comparative Gene Expression Analysis of the Coronal Pulp and Apical Pulp Complex in Human Immature Teeth.
Specimen part
View SamplesThere are histological and functional differences between human deciduous and permanent pediodontal ligament (PDL) tissues. The purpose of this study was to determine the differences between these two types of tissue at the molecular level by comparative gene expression analysis.
Comparative gene expression analysis of the human periodontal ligament in deciduous and permanent teeth.
Specimen part
View Samples