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Down-regulated claudin-7 immunoexpression in urothelial carcinoma of the urinary bladder.

Gadelmoula M, Fukumori T, Nakatsuji H, Elgammal M, Toida K, Kanayama HO - Arab J Urol (2013)

Bottom Line: Claudin-7 was down-regulated in UC samples compared to NU samples (P < 0.001).These results indicate that a reduced expression of claudin-7 correlates with the invasiveness and progression of UC of the urinary bladder.Further studies are needed to validate claudin-7 as a marker for UC.

View Article: PubMed Central - PubMed

Affiliation: Urology Department, Assiut University Hospitals, Assiut, Egypt.

ABSTRACT

Objectives: To analyse the gene-expression level of claudin-7 in urothelial carcinoma (UC) of the urinary bladder, and its relationship with clinicopathological variables.

Materials and methods: This study included 68 specimens of UC of the bladder, comprising 35 with non-muscle-invasive (NMI), stage Ta-T1, and 33 with muscle-invasive (MI) tumours, T2-T4, and 26 of normal urothelium (NU). Total RNA was extracted and 1 μg was reverse transcribed using a cDNA kit. RT-PCR was conducted using SYBR Green I dye to examine the expression levels of the target gene (claudin-7) and the housekeeping gene glyceraldehyde-3-phosphate dehydrogenase. Using confocal-laser scanning light microscopy, immunohistochemistry (IHC) was used to validate the RT-PCR data. The correlation between claudin-7 and the clinicopathological variables was assessed.

Results: Claudin-7 was down-regulated in UC samples compared to NU samples (P < 0.001). NMI (Ta-T1) tumours had significantly higher claudin-7 expression than MI (⩾pT2) tumours (P = 0.012). There was no significant difference between patients with G1-2 tumours and those with G3 tumours (P = 0.19). There was no significant difference between patients with recurrent NMI UC and those with no recurrence (P = 0.61). IHC showed a lower expression of claudin-7 in the UC samples than NU samples, and in MI UC than in NMI UC.

Conclusions: These results indicate that a reduced expression of claudin-7 correlates with the invasiveness and progression of UC of the urinary bladder. Further studies are needed to validate claudin-7 as a marker for UC.

No MeSH data available.


Related in: MedlinePlus

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Down-regulated claudin-7 immunoexpression in urothelial carcinoma of the urinary bladder.

Gadelmoula M, Fukumori T, Nakatsuji H, Elgammal M, Toida K, Kanayama HO - Arab J Urol (2013)

© Copyright Policy - CC BY-NC-ND
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4442981&req=5

Bottom Line: Claudin-7 was down-regulated in UC samples compared to NU samples (P < 0.001).These results indicate that a reduced expression of claudin-7 correlates with the invasiveness and progression of UC of the urinary bladder.Further studies are needed to validate claudin-7 as a marker for UC.

View Article: PubMed Central - PubMed

Affiliation: Urology Department, Assiut University Hospitals, Assiut, Egypt.

ABSTRACT

Objectives: To analyse the gene-expression level of claudin-7 in urothelial carcinoma (UC) of the urinary bladder, and its relationship with clinicopathological variables.

Materials and methods: This study included 68 specimens of UC of the bladder, comprising 35 with non-muscle-invasive (NMI), stage Ta-T1, and 33 with muscle-invasive (MI) tumours, T2-T4, and 26 of normal urothelium (NU). Total RNA was extracted and 1 μg was reverse transcribed using a cDNA kit. RT-PCR was conducted using SYBR Green I dye to examine the expression levels of the target gene (claudin-7) and the housekeeping gene glyceraldehyde-3-phosphate dehydrogenase. Using confocal-laser scanning light microscopy, immunohistochemistry (IHC) was used to validate the RT-PCR data. The correlation between claudin-7 and the clinicopathological variables was assessed.

Results: Claudin-7 was down-regulated in UC samples compared to NU samples (P < 0.001). NMI (Ta-T1) tumours had significantly higher claudin-7 expression than MI (⩾pT2) tumours (P = 0.012). There was no significant difference between patients with G1-2 tumours and those with G3 tumours (P = 0.19). There was no significant difference between patients with recurrent NMI UC and those with no recurrence (P = 0.61). IHC showed a lower expression of claudin-7 in the UC samples than NU samples, and in MI UC than in NMI UC.

Conclusions: These results indicate that a reduced expression of claudin-7 correlates with the invasiveness and progression of UC of the urinary bladder. Further studies are needed to validate claudin-7 as a marker for UC.

No MeSH data available.


Related in: MedlinePlus