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Differential SPARC mRNA expression in Barrett's oesophagus.
J Brabender1, R V Lord, R Metzger
1Department of Visceral- and Vascular Surgery, University of Cologne, Joseph-Stelzmann Str. 9, Cologne 50931, Germany. jan.brabender@t-online.de
British Journal of Cancer
|October 17, 2003
Summary
Secreted protein acidic and rich in cysteine (SPARC) mRNA is upregulated early in Barrett's oesophagus (BE) and oesophageal adenocarcinoma (EA). This suggests SPARC may serve as a biomarker for early detection of EA.
Area of Science:
- Gastroenterology
- Molecular Oncology
- Cancer Biomarkers
Background:
- Barrett's oesophagus (BE) is a precursor to oesophageal adenocarcinoma (EA).
- Understanding molecular changes in BE progression is crucial for diagnosis and treatment.
- Secreted protein acidic and rich in cysteine (SPARC) is implicated in solid tumor development.
Purpose of the Study:
- To determine the prevalence and timing of SPARC mRNA expression in BE and EA.
- To investigate the role of SPARC alterations in BE and EA development and progression.
- To evaluate SPARC as a potential biomarker for oesophageal adenocarcinoma.
Main Methods:
- Quantitative real-time RT-PCR was used to measure SPARC mRNA expression.
- 108 specimens from 19 BE patients, 20 EA patients, and 10 controls were analyzed.
- SPARC expression was compared between normal oesophagus, BE tissues, and EA tissues.
Main Results:
- SPARC mRNA expression was significantly upregulated in BE and EA tissues compared to normal oesophagus.
- SPARC mRNA levels were higher in EA tissues than in BE tissues.
- SPARC expression differed between metaplastic and dysplastic BE tissues, and was elevated in normal-appearing oesophagus of EA patients.
Conclusions:
- Upregulation of SPARC mRNA is an early event in BE and EA development.
- SPARC may serve as a valuable biomarker for detecting early-stage oesophageal adenocarcinoma.
- A 'field effect' of elevated SPARC expression is present in the normal oesophagus of patients with EA.