Background: Periodontal bacteria is the major pathogens in the oral cavity and the main cause of adult chronic periodontitis, but their association with incidence and prognosis in cancer is controversial. The aim of this study was to evaluate the effect of periodontal bacteria infection on incidence and prognosis of cancer. Methods: A systematic literature search of PubMed, Embase, Web of Science, and Cochrane Library databases was performed to obtain 39 studies comprising 7184 participants. The incidence of cancer was evaluated as odd ratios (OR) with a 95% confidence interval (95% CI) using Review Manager 5.2 software. Overall survival, cancer-specific survival and disease-free survival, which were measured as hazard ratios (HR) with a 95% CI using Review Manager 5.2 software. Results: Our results indicated that periodontal bacteria infection increased the incidence of cancer (OR = 1.25; 95%CI: 1.03–1.52) and was associated with poor overall survival (HR = 1.75; 95% CI: 1.40–2.20), disease-free survival (HR = 2.18; 95%CI: 1.24–3.84) and cancer-specific survival (HR = 1.85, 95%CI: 1.44–2.39). Subgroup analysis indicted that the risk of cancer was associated with Porphyromonas gingivalis (Pg) infection (OR = 2.16; 95%CI: 1.34–3.47) and Prevotella intermedia (Pi) infection (OR = 1.28; 95%CI: 1.01–1.63) but not Tannerella forsythia (Tf) (OR = 1.06; 95%CI: 0.8–1.41), Treponema denticola (Td) (OR = 1.30; 95%CI: 0.99–1.72), Aggregatibacter actinomycetemcomitans (Aa) (OR = 1.00; 95%CI: 0.48–2.08) and Fusobacterium nucleatum (Fn) (OR = 0.61; 95%CI: 0.32–1.16). Conclusion: This meta-analysis revealed periodontal bacteria infection increased the incidence of cancer and predicted poor prognosis of cancer.
Background Glucose metabolism in cancer associated fibroblasts (CAFs) within the tumor microenvironment is a material and energy source for tumorigenesis and tumor development. However, the characteristics and important regulatory mechanisms of glucose metabolism in fibroblasts associated with oral squamous cell carcinoma (OSCC) are still unknown. Methods We successfully isolated, cultured, purified and identified CAFs and normal fibroblasts (NFs). Cell culture, immunohistochemistry (IHC) and CCK8, flow cytometry, Seahorse XF Analyzer, MitoTracker assay, western blotting (WB), transmission electron microscope, Quantitative real-time PCR (qPCR), immunofluorescence (IF), and Label-free quantitative proteomics assay, animal xenograft model studies and statistical analysis were applied in this study. Results We demonstrated that the proliferation activity of CAFs was significantly enhanced as compared to NFs, while the apoptosis rate was significantly decreased. CAFs in OSCC preferentially use oxidative phosphorylation (OXPHOS) rather than glycolysis. Moreover, CAFs showed stronger maximal respiration, a larger substantial mitochondrial spare respiratory capacity (SRC) and higher adenosine triphosphate (ATP) production capacity than NFs. The results of mitotracker green fluorescence staining showed that compared with NFs, CAFs exhibited stronger green fluorescence. The results of WB showed the expression level of Peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) obviously increased in CAFs compared to NFs. These results confirmed that CAFs have greater mitochondrial activity and function than NFs. Furthermore, Label-free quantitative proteomics assays showed that both ATP synthase subunit O (ATP5O) and tumor necrosis factor receptor-associated protein 1 (TRAP1) are important differentially expressed proteins in the mitochondria of CAFs/NFs. Overexpression of TRAP1 in CAFs increased basal oxygen consumption rate (OCR), maximal respiration, ATP production and SRC. In vivo, overexpression TRAP1 expression in CAFs suppress tumor growth. Conclusion Taken together, the results indicated that TRAP1 is an important regulatory molecule of CAFs glucose metabolism and promotes OSCC progression by regulating the OXPHOS of CAFs.
BackgroundJunction plakoglobin (JUP) is an important cell‐cell junction protein. Recently, its deregulation has been correlated with the initiation and progression of various malignancies. Our aim was to investigate the expression of JUP in oral squamous cell carcinoma (OSCC) and its correlation with prognosis and to further study the effects of JUP on the proliferation, apoptosis, migration and invasion of OSCC cells.MethodsWe detected JUP expression in 273 OSCC specimens using immunohistochemistry. We assessed the correlation of JUP expression with clinicopathologic parameters and patient survival by Cox regression. Then, expression levels of JUP in normal oral keratinocytes (NOKs) and OSCC cell lines were detected by Western blotting and quantitative real‐time PCR (qPCR). Next, we used HSC3 cells to study the effect of JUP on tumor cell proliferation, apoptosis, migration, and invasion by using cell counting kit‐8, flow cytometry, and transwell assays, respectively.ResultsCox regression showed that high expression of JUP was related to the poor prognosis of OSCC patients. Western blotting and qPCR assays showed that the expression level of JUP in OSCC cell lines was higher than that in NOKs. Overexpression of JUP promoted the proliferation, metastasis, and invasion of HSC3 cells and inhibited apoptosis, while the opposite was observed after JUP knockdown.ConclusionThis study initially revealed that JUP was overexpressed in OSCC, and that JUP promoted the proliferation, migration, and invasion of OSCC cells and inhibited apoptosis. Moreover, high expression of JUP could be used as a potential prognostic marker of OSCC.
Background Periodontal bacteria is the major pathogens in the oral cavity and the main cause of adult chronic periodontitis, but their association with incidence and prognosis in cancer is controversial. The aim of this study was to evaluate the effect of periodontal bacteria infection on incidence and prognosis of cancer.Methods A systematic literature search of PubMed, Embase, Web of Science and Cochrane Library databases was performed to obtain 39 studies comprising 7184 participants. The incidence of cancer was evaluated as odd ratios (OR) with a 95% confidence interval (95% CI) using Review Manager 5.2 software. Overall survival (OS), cancer-specific survival (CSS) and disease-free survival (DFS), which were measured as hazard ratios (HR) with a 95% confidence interval (95% CI) using Review Manager 5.2 software.Results Our results indicated that periodontal bacteria infection increased the incidence of cancer (OR=1.25; 95%CI: 1.03–1.52) and was associated with poor OS (HR = 1.75; 95% CI: 1.40–2.20), DFS (HR=2.18; 95%CI: 1.24–3.84) and CSS (HR=1.85, 95%CI: 1.44–2.39). Subgroup analysis indicted that the risk of cancer was associated with Porphyromonas gingivalis (Pg) infection (OR=2.16; 95%CI: 1.34–3.47) and Prevotella intermedia (Pi) infection (OR=1.28; 95%CI: 1.01–1.63) but not Tannerella forsythia (Tf) (OR=1.06; 95%CI: 0.8–1.41), Treponema denticola (Td) (OR=1.30; 95%CI: 0.99–1.72), Aggregatibacter actinomycetemcomitans (Aa) (OR=1.00; 95%CI: 0.48–2.08) and Fusobacterium nucleatum (Fn) (OR=0.61; 95%CI: 0.32–1.16).Conclusion This meta-analysis revealed periodontal bacteria infection increased the incidence of cancer and predicted poor prognosis of cancer.
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