Comparison of glutathione S-transferase-Pi expression at mRNA levels in oesophageal mucosa using RT-PCR-ELISA in individuals with reflux diseases, adenocarcinoma and squamous cell carcinoma.
OBJECTIVE
To develop a RT-PCR technique coupled with Enzyme Linked Immunosobant Assay (ELISA) i.e. RT-PCR-ELISA for measurement of class-Pi glutathione S-transferase (GST-P)-specific mRNA in esophageal diseases.


METHODS
In this study, 66 esophageal tissue biopsies diagnosed as non-erosive reflux disease (NERD), gastroesophageal reflux disease (GERD), adenocarcinoma (ADC), and squamous cell carcinoma (SCC) were used. Standardization of the RT-PCR-ELISA was carried out using specific GST-Pi and beta-actin primers, biotin labeled probe, DIG-labeling RT-PCR and anti-DIG-HRP conjugate.


RESULTS
The results of RT-PCR-ELISA based on OD ratio of GST-Pi mRNA/beta-actin showed that there was no significant difference in GST-Pi expression in normal, NERD and GERD samples. Overexpression of GST-Pi in malignant tissues (ADC and SCC) was distinguishable. The OD ratio of GST-Pi mRNA expression to beta-actin mRNA was 1.17+/-0.13 and 1.3+/-0.13 in ADC and SCC samples, respectively, which is significantly higher (P<0.05) than matching control (0.78+/-0.06 and 0.85+/-0.07).


CONCLUSIONS
RT-PCR-ELISA showed that GST-Pi expression was not altered in GERD and NERD esophagus, whereas, in ADC and SCC samples, it was significantly higher (P<0.05) as compared to inflamed and normal tissues.
Rasmi
Y
Y
Department of Clinical Biochemistry, Faculty of Medical Sciences, Tarbiat Modarres University, P. O. Box 14115-331, Tehran, Iran.
Allameh
A
A
Nasseri-Moghaddam
S
S
Gill
P
P
Moghaddam
M Forouzandeh
MF
Hedayati
M
M
D000230:Adenocarcinoma / Q000201:enzymology* / Q000235:genetics; D001483:Base Sequence; D001706:Biopsy; D002294:Carcinoma, Squamous Cell / Q000201:enzymology* / Q000235:genetics; D017931:DNA Primers; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D004935:Esophageal Diseases / Q000201:enzymology* / Q000235:genetics; D004938:Esophageal Neoplasms / Q000201:enzymology* / Q000235:genetics; D005764:Gastroesophageal Reflux / Q000201:enzymology* / Q000235:genetics; D005982:Glutathione Transferase / Q000235:genetics*; D006801:Humans; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D012680:Sensitivity and Specificity
D017931:DNA Primers; D012333:RNA, Messenger; D005982:Glutathione Transferase