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Expression of transforming growth factor beta mRNA isoforms in human breast cancer
J MacCallum1, J M Bartlett, A M Thompson
1University Department of Surgery, Edinburgh Royal Infirmary, UK.
Abstract:
Using an RNAse protection assay, expression of messenger RNA for isoforms of TGF-beta was determined in a series of breast cancers. Of 50 tumours, 45 (90%) expressed TGF-beta 1 mRNA, 39 (78%) expressed TGF-beta 2, and 47 (94%) expressed TGF-beta 3. Patterns of expression varied between different tumours: 37 (74%) cancers expressed all three TGF-beta isoforms, ten (20%) expressed only two isoforms and two expressed TGF-beta 1 alone. One sample showed no evidence of TGF-beta mRNA expression. Although most breast cancers expressed mRNA for at least one isoform of TGF-beta, there were differences in patterns of mRNA expression between individual tumours. The relatively small number of tumours examined precluded detailed analysis between expression and other clinical parameters, but a significant association was identified between one aspect of isoform expression and lymph node status, in that the majority of tumours expressing all three isoforms were associated with lymph node involvement, whereas tumours without one or more isoform were usually lymph node negative (P = 0.025 by Fisher's exact test).
Insights
Most breast cancers express messenger RNA (mRNA) for Transforming Growth Factor-beta (TGF-beta) isoforms. High expression of all three TGF-beta isoforms correlated with lymph node involvement in breast cancer patients.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Transforming Growth Factor-beta (TGF-beta) is a crucial cytokine involved in cell growth, differentiation, and immune response.
- Aberrant TGF-beta signaling is implicated in various cancers, including breast cancer.
- Understanding the expression patterns of TGF-beta isoforms in breast tumors is essential for elucidating their role in tumorigenesis.
Purpose of the Study:
- To investigate the messenger RNA (mRNA) expression levels of TGF-beta isoforms (TGF-beta 1, TGF-beta 2, and TGF-beta 3) in a cohort of breast cancer tissues.
- To analyze the patterns of TGF-beta isoform expression and their potential association with clinical parameters, specifically lymph node status.
Main Methods:
- Utilized RNAse protection assay to quantify mRNA expression of TGF-beta 1, TGF-beta 2, and TGF-beta 3.
- Analyzed expression patterns in 50 breast tumor samples.
- Correlated TGF-beta isoform expression with lymph node status using Fisher's exact test.
Main Results:
- High prevalence of TGF-beta isoform mRNA expression was observed: 90% for TGF-beta 1, 78% for TGF-beta 2, and 94% for TGF-beta 3.
- The majority of tumors (74%) expressed all three TGF-beta isoforms.
- A significant association (P = 0.025) was found between the expression of all three TGF-beta isoforms and lymph node involvement, with most triple-isoform-expressing tumors showing lymph node positivity.
Conclusions:
- Most breast cancers express mRNA for at least one TGF-beta isoform, indicating a potential role in the disease.
- The specific pattern of TGF-beta isoform expression, particularly the co-expression of all three, is significantly associated with lymph node metastasis in breast cancer.
- Further research with larger cohorts is warranted to explore the prognostic and diagnostic implications of TGF-beta isoform expression patterns in breast cancer.
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