Project description:Co-culture with human oral squamous cell carcinoma cells, 3A or NEM, or culture with each of their conditioned medium induced many osteoclasts from osteoclast precursor cells, which were generated by a 24-h pretreatment of RANKL or TNF-α. However, HO1-N-1 cells did not induce any osteoclasts. Osteoprotegerin, a decoy RANKL receptor, denosumab, an anti-RANKL antibody drug, and infliximab, an anti-TNF-α antibody drug, did not prevent this tumor-associated osteoclastogenesis. We compared the expression of molecules associated with osteoclastogenesis between 3A and HO1-N-1 cells.
Project description:RNA-Seq was applied to oral squamous cell carcinomas and matched normal oral tissue to measure gene expression patterns and identify examples of allelic imbalance. Oral squamous cell carcinomas (OSCC) and matched normal tissue from 3 patients.
Project description:RNA-Seq was applied to oral squamous cell carcinomas and matched normal oral tissue to measure gene expression patterns and identify examples of allelic imbalance.
Project description:Genome-wide expression array measurements for 9 head and neck squamous cell carcinomas (HNSCC) stratified by worst pattern of invasion (WPOI) Jayakar et al. (2016). Apolipoprotein E promotes invasion in oral squamous cell carcinoma. Li et al. (2013). Validation of the risk model: high-risk classification and tumor pattern of invasion predict outcome for patients with low-stage oral cavity squamous cell carcinoma.
Project description:Oral Squamous Cell Carcinomas (OSCC) are among the most frequent and lethal cancers worldwide. Advanced stage tumors are still treated with standard chemotherapy, however, most of the patients develop chemotherapy resistance. To uncover new functional biomarkers of cisplatin response, we performed a synthetic lethality genome wide CRISPR/Cas9 screen in an oral squamous cell carcinoma cell line. This led to the discovery of AMBRA1, as a regulator of cisplatin sensitivity. In all tested OSCC cell lines and oral primary cultures, AMBRA1 knockout cells showed increased sensitivity to cisplatin treatment. Mechanistically, we demonstrated a new function of AMBRA1, where loss of AMBRA1 led to higher S phase, higher expression of genome instability markers, and higher DNA damage in basal conditions, thereby predisposing cancer cells to an increased sensitivity to cisplatin as well as to other platinum drugs. In summary, we uncovered AMBRA1 as a potential biomarker of response to platinum-based therapies in oral squamous cell carcinomas.
Project description:Oral Squamous Cell Carcinomas (OSCC) are among the most frequent and lethal cancers worldwide. Advanced stage tumors are still treated with standard chemotherapy, however, most of the patients develop chemotherapy resistance. To uncover new functional biomarkers of cisplatin response, we performed a synthetic lethality genome wide CRISPR/Cas9 screen in an oral squamous cell carcinoma cell line. This led to the discovery of AMBRA1, as a regulator of cisplatin sensitivity. In all tested OSCC cell lines and oral primary cultures, AMBRA1 knockout cells showed increased sensitivity to cisplatin treatment. Mechanistically, we demonstrated a new function of AMBRA1, where loss of AMBRA1 led to higher S phase, higher expression of genome instability markers, and higher DNA damage in basal conditions, thereby predisposing cancer cells to an increased sensitivity to cisplatin as well as to other platinum drugs. In summary, we uncovered AMBRA1 as a potential biomarker of response to platinum-based therapies in oral squamous cell carcinomas.
Project description:Genome-wide expression array measurements for 9 head and neck squamous cell carcinomas (HNSCC) stratified by worst pattern of invasion (WPOI) Jayakar et al. (2016). Apolipoprotein E promotes invasion in oral squamous cell carcinoma. Li et al. (2013). Validation of the risk model: high-risk classification and tumor pattern of invasion predict outcome for patients with low-stage oral cavity squamous cell carcinoma. Comparison of transcription profiles between OSCC tumors with a more invasive (WPOI 5) versus a less invasive (WPOI 3) pattern of invasion using two independent Illumina platforms.
Project description:Identification of genes that are differentially regulated in fibroblasts derived from dysplastic oral mucosa and oral squamous cell carcinoma compared to fibroblasts derived from normal oral mucosa. Affymetrix microarrays were used to define differential gene expression. Populations of fibroblasts were isolated from human normal oral mucosa, oral dysplasia and oral squamous cell carcinoma, maintained in 3D collagen I biomatrices, RNA extracted and processed for Affymetrix arrays. Fibroblasts maintained as monolayers were also included as comparators.