ABSTRACT
Background and purpose: The Testin gene is a candidate tumor suppressor gene located at 7q31.2. Our purpose was to investigate the expression of Testin gene, and its possible relationship with the clinicopathological features of human colorectal carcinoma. Methods: Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemistry methods were used to investigate the expression of Testin in 60 specimens of colorectal carcinomas and corresponding adjacent normal mucosal tissues. The correlations of Testin to clinicopathologic features of colorectal carcinoma were analyzed. Results: The mRNA level of Testin was down-regulated in colorectal carcinomas. The positive rate of Testin protein was significantly lower than the paracancerous mucosal normal tissues (P<0.01). The expression of Testin protein and mRNA was correlated with infiltration, differentiation, Dukes stage, T stage,lymph node metastasis and distant metastasis (P<0.05), but not with patients' gender, age, site of cancer (P>0.05). The expression of Testin protein was lower in the tissues which were deeper infiltrated, poorer differentiated, advanced in Dukes stage and T stage, or with lymph node or remote metastasis. The expression of Testin mRNA was positively associated with that of Testin protein(r=0.75,P<0.05). Conclusion: The expression level of Testin is significantly down-regulated in colorectal carcinomas, which may be associated with the degree of infiltration, differentiation and metastasis of colorectal carcinoma. It suggests that Testin may be a valuable marker for assessing the prognosis and metastasis of colorectal carcinoma.
ABSTRACT
Objective To investigate the expression of platelet-derived growth factor-D (PDGF-D) and bascular endothelial growth factor(VEGF) in gastric carcinoma and elucidate the potential relationship between their overex-pression and clinical pathological characteristics. Methods Immunohistochemical assay was performed to detect the protein expression of PDGF-D and VEGF in tissues. Semiquantitative reverse transcription polymerase chain re-action (RT-PCR) was performed to evaluate the mRNA expression of PDGF-D and VEGF in part of random selec-ting gastric carcinoma samples. The correlation between the expression of PDGF-D and VEGF, and the relationship between the expression of PDGF-D, VEGF and the clinical pathological characteristics were analyzed. Results The protein expression of PDGF-D and VEGF in gastric carcinoma tissues were significantly higher than that in adjacent tissues and normal gastric mucosa(P <0.05) ;The expression of PDGF-D and VEGF correlated with TNM staging, depth of invasion and lymphatic metastasis (P < 0.05), while the expression of PDGF-D also correlated to histolog-ical differentiation (P < 0.05). There was a significant positive correlation between PDGF-D and VEGF at the mR-NA and protein expression levels (P < 0.05). Conclusion PDGF-D and VEGF specifically highly expressed in gastric carcinoma. The abnormal expression may play an important role in the carcinogenesis and metastasis of gas-tric carcinoma.
ABSTRACT
Objective To investigate the expression of platelet-derived growth factor-D(PDGF-D) and bascular endothelial growth factor(VEGF) in gastric carcinoma and elucidate the potential relationship between their overexpression and clinical pathological characteristics.Methods Immunohistochemical assay was performed to detect the protein expression of PDGF-D and VEGF in tissues.Semiquantitative reverse transcription polymerase chain reaction(RT-PCR) was performed to evaluate the mRNA expression of PDGF-D and VEGF in part of random selecting gastric carcinoma samples.The correlation between the expression of PDGF-D and VEGF,and the relationship between the expression of PDGF-D,VEGF and the clinical pathological characteristics were analyzed.Results The protein expression of PDGF-D and VEGF in gastric carcinoma tissues were significantly higher than that in adjacent tissues and normal gastric mucosa(P