Related Experiment Video
Updated: Jun 19, 2026
06:54
Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
Published on: October 27, 2020
The expression and function of IGFBP-3 in normal and malignant breast tissue
K McCarthy1, C Laban, C J McVittie
1Breast Unit, Barts and The London Queen Mary School of Medicine, London, UK. kathrynmccarthy@doctors.org.uk
Anticancer Research
|October 23, 2009
Summary
Insulin-like growth factor binding protein-3 (IGFBP-3) shows potential in breast cancer therapy. When combined with doxorubicin, IGFBP-3 increased tumor cell death while protecting normal cells, suggesting a novel treatment approach.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Insulin-like growth factor-I (IGF-I) signaling, regulated by IGF binding proteins (IGFBPs), plays a role in cell growth and survival.
- The specific role and regulation of IGFBP-3 in breast cancer, independent of IGF-I, remain largely unexplored.
- Understanding IGFBP-3's function is crucial for developing targeted breast cancer therapies.
Purpose of the Study:
- To investigate the expression of IGFBP-3 in breast tissues and its correlation with clinicopathological parameters.
- To explore the IGF-independent role of IGFBP-3 in breast cancer using a novel in vitro tissue explant system.
- To evaluate the potential of IGFBP-3 as a therapeutic agent or biomarker in breast cancer treatment.
Main Methods:
- Quantitative analysis of IGFBP-3 mRNA and protein expression using RT-PCR, immunohistochemistry, and ELISA in breast tissue samples (n=70).
- Comparison of IGFBP-3 expression with other IGF-I axis members, tumorigenic genes, and clinicopathological data.
- In vitro assessment of IGFBP-3's effect on tissue viability and apoptosis in normal and malignant breast tissue explants, alone and with doxorubicin.
Main Results:
- High expression levels of IGFBP-3 mRNA and protein were detected in all analyzed breast tissue samples.
- No significant correlation was found between IGFBP-3 expression levels and clinicopathological parameters.
- In vitro, IGFBP-3 alone had minimal impact on apoptosis, but in combination with doxorubicin, it enhanced apoptosis in tumors while protecting normal tissues.
Conclusions:
- IGFBP-3 exhibits differential effects on apoptosis in breast cancer, potentially offering a protective role in normal tissues and an apoptotic-inducing role in tumors when combined with chemotherapy.
- These findings suggest IGFBP-3 could be a valuable target for novel chemotherapeutic strategies and a potential biomarker for treatment response assessment.
- Further research into IGFBP-3's role may aid in cancer risk assessment, prevention, and personalized treatment approaches for breast cancer.
Related Concept Videos
01:16TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
02:23Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...