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Objective To study the expression and significance of EGFR, PDCD4, TGF-β1, Smad3, Smad7 in oral normal mucosa, oral simple hyperplasia, oral epithelial dysplasia and oral squamous cell carcinomas(OSCC).Methods Serum levels of EGFR, PDCD4 were measeured with ELISA in Chinese hamster during the oral mucosa carcinogenesis;The expressions of TGF-β1, Smad3, Smad7 in oral normal mucosa, oral simple hyperplasia, oral epithelial dysplasia and OSCC tissues were examined by immunohistochemistry.Results In the process of oral carcinogenesis,the expression level of EGFR increased significantly,while the expression of PDCD4 was decreased, the negatively correlation was evident between expression of these two proteins in ED and SCC.The expression of TGF-β1, Smad7 was higher in OSCC than in oral normal mucosa, oral simple hyperplasia, oral epithelial dysplasia(P < 0.05), while the expression of Smad3 was decreased.Further analysis showed the expression of TGF-β1 was correlated with the expression of Smad7.Conclusions The expressions of EGFR, PDCD4, TGF-β1, Smad3, Smad7 are closely related with the biological behaviors of oral squamous cell cancinoma.This experiment provides a theoretical basis for the study of oral squamous cell carcinomas mechanism research.So it has important significance for the development and prognosis of oral squamous carcinomaare.
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Objective To study the expression and significance of apoptosis-related genes caspase-3,caspase-9,Bax and Bcl-2 in oral normal mucosa,oral simple hyperplasia,oral epithelial dysplasia and oral squamous cell carcinomas (OSCC) in Chinese hamsters.Methods The expressions of mRNA and protein of caspase-3,caspase-9,Bax and Bcl-2 in the oral normal mucosa,oral simple hyperplasia,oral epithelial dysplasia and OSCC tissues in Chinese hamsters were examined by immunohistochemistry and RT-PCR.Results During the process of oral carcinogenesis,the expression of Bcl-2 protein was significantly higher in OSCC than in oral normal mucosa,oral simple hyperplasia,and oral epithelial dysplasia (P<0.05).In dysplastic epithelia,the protein expressions of caspase-3,caspase-9 and Bax were more than that of normal epithelia,and along with the increased dysplasis,the expression level was decreased.Further analysis showed that expression of Bcl-2 was negatively related with the expressions of Bax,caspase-3 and caspase-9 (P<0.05).The result of RT-PCR showed that Bcl-2 was significantly increased in OSCC compared with normal mucosa,while the expressions of caspase-3,caspase-9 and Bax were decreased (P<0.05).Conclusions In the Chinese hamster squamous carcinoma,the expressions of caspase-3,caspase-9 and Bax are reduced and the Bcl-2 expression are increased,indicating that the expressions of caspase-3,caspase-9,Bax and Bcl-2 are closely related with the occurrence and development of oral squamous cell cancinoma.This study can offer some clues for gene therapy of OSCC,or can provide a reference for evaluating the biological characteristics and prognosis of OSCC.
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Objetivo: Analisar expressão da cadeia γ2 da laminina 332 na membrana basal de vasos de carcinoma de células escamosas orais (CCE) e seu aspecto de continuidade para detecção de possíveis processos invasivos vasculares, importante evento na progressão da doença. Ainda, associar os aspectos clínicos do paciente e da lesão com os achados microscópicos. Material e Métodos: Foi realizada técnica imuno-histoquímica para detecção da cadeia γ2 da laminina 332 em 16 casos de CCE, sendo oito Bem Diferenciado e oito Moderadamente Diferenciado. Os aspectos microscópicos avaliados foram expressão da molécula na membrana basal de vasos e o seu aspecto de continuidade. Possíveis associações entre dados clínicos e achados microscópicos foram avaliadas. Resultados: Um total de 15 casos (93,75%) apresentaram vasos com expressão da cadeia γ2. Em CCE Bem Diferenciados, 85,71% das lesões apresentaram vasos com perda de continuidade da membrana basal, enquanto que em CCE Moderadamente Diferenciados 100% dos casos tiveram vasos com esse aspecto. Em relação às associações entre aspectos clínicos e integridade da membrana basal vascular, nos CCE Bem Diferenciados foram observadas correlações positivas da perda de continuidade com o gênero e idade acima de 60 anos (p < 0,0001). Para CCE Moderadamente Diferenciado, as associações foram com gênero masculino (p < 0,0001), hábito de fumar (p < 0,0001) e idade < 60 anos (p < 0,0001). Conclusão: Nossos dados sugerem que a expressão da cadeia γ2 em estruturas vasculares está presente em lesões de CCE e pode estar associada ao comportamento mais agressivo da doença.
Objective: 1) To analyze the γ2 chain expression of laminin 332 in the basement membrane of vessels of oral squamous cell carcinoma (OSCC), and the appearance of continuity, to identify possible vascular invasive procedures which are important events in the disease progression. 2) To examine the association between clinical aspects from patients and microscopic findings from lesions. Material and Methods: Immunohistochemistry was performed to detect γ2 chain of laminin 332 in 16 cases of OSCC; of which, eight were classified as being "Well Differentiated" and eight as being "Moderately Differentiated." Microscopic aspects were evaluated, including the expression of the molecule in the basement membrane of vessels and the appearance of continuity. Results: 15 cases (93.75%) showed vessels with γ2 chain expression. In OSCC defined as being "Well Differentiated," 85.71% of lesions presented with loss of vessel continuity of the basement membrane, whereas in OSCC defined as being "Moderately Differentiated," 100% of presented vessels with this aspect. Regarding associations between clinical aspects of patients and integrity of the vascular basement membrane, in OSCC defined as being "Well Differentiated," positive correlations were observed between loss of continuity and both gender and age >60 years (p < 0.0001). For OSCC defined as being "Moderately Differentiated," positive associations were observed for being male (p < 0.0001), currently smoking (p < 0.0001) and being <60 years old (p < 0.0001). Conclusion: Our data suggest that the γ2 chain expression in vascular structures is present in OSCC and is associated with more aggressive disease.
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Objective: This study proposed a possible molecular mechanism underlying centrosome amplification in oral squa-mous cell carcinoma (OSCC) by analyzing the relationship of centrosome amplification with the expression of STK15 and p53 in OS-CC tissues. Methods: The expression of STK15 and p53 in formalin-fixed, paraffin-embedded tissues from 8 patients with normal oral epithelium and 43 with OSCC were quantitatively analyzed by immunohistochemistry. Centrosome status was investigated by an indi-rect-immunofluorescence double-staining method to determine the message of centrosome amplification in OSCC. The correlation of the expression of the two proteins with centrosome amplification in OSCC was statistically analyzed with SPSS13.0. Results: Normal oral epithelium showed normal centrosomes in epithelium cells, whereas 33 of the 43 OSCC cases (76.74%) showed evidence of centro-some amplification. STK15 was undetectable in normal oral epithelium. The percentage of STK15 overexpression was 67.44% in OS-CC (P=0.028). The percentage of STK15 overexpression was significantly higher in OSCC with positive p53 staining than in OSCC with negative p53 staining (P=0.01). Spearman correlation analysis indicated a correlation between STK15/p53 positive co-expression and centrosome amplification of OSCC (P=0.019). Conclusion: Centrosome amplification is a common abnormal phenomenon in OS-CC. The p53/STK15 trans-activation-independent pathway plays a role in the systemic molecular regulation of centrosome in OSCC, which leads to the occurrence of OSCC.
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We examined P53 mutation and invasion front grading(IFG)in 30 cases of oral squamous cell carcinomas(OSCCs).The association of P53 mutation and IFG scores with clinicopathological parameters was evaluated.P53 mutation existed in exon 5-8 in 15 out of the 30 OSCCs(50%).The incidence of P53 mutation was not associated with age,gender,N value and TNM stage.However,there was a significant correlation between P53 mutation and T value(P=-0.046).There were no statistically significant correlations among the clinicopathological parameters and IFG.Interestingly,The IFG score in OSCCs with P53 mutation was significantly higher than that in OSCCs without P53 mutation(P<0.001).These results suggest that the high incidence of P53 mutation is a major mechanism of OSCC carcinogenesis.The presence of P53 mutation indicates the most anaplastic fields in the invasive areas of the tumors,which may predict poor prognosis for the patients.