Integrin expression and glycosylation patterns regulate cell-matrix adhesion and alter with breast cancer progression

Area of Science:

• Biochemistry
• Cell Biology
• Oncology

Background:

• Integrins are key cell adhesion glycoproteins mediating cell-extracellular matrix (ECM) interactions and metastasis.
• Proper integrin folding and function depend on glycosylation, a critical post-translational modification.

Purpose of the Study:

• To investigate the differential expression of integrins αvβ3 and αvβ6 in breast cancer cells representing distinct metastatic stages.
• To elucidate the role of integrin N-glycosylation in cell adhesion and its alteration during breast cancer progression.

Main Methods:

• Quantitative analysis of integrin αvβ3 and αvβ6 expression at both mRNA and protein levels in MDA-MB-231, MDA-MB-468, and MCF-10A cell lines.
• Assessment of cell adhesion properties to fibronectin in relation to integrin expression.
• Evaluation of the effect of glycosylation inhibition (Swainsonine) on cellular invasive properties.

Main Results:

• Distinct expression patterns of αvβ3 and αvβ6 integrins were observed across the cell lines.
• Highly metastatic cells exhibited increased αvβ3 expression, whereas moderate and non-tumorigenic cells showed higher αvβ6 expression.
• N-glycosylation was confirmed as essential for integrin-mediated cell adhesion to ECM proteins like fibronectin, with inhibition impacting invasiveness.

Conclusions:

• Integrin αvβ3 and αvβ6 expression profiles and their N-glycosylation patterns are significantly altered during breast cancer progression.
• These alterations in integrin expression and glycosylation play crucial roles in modulating cell adhesion and metastatic potential.
• Targeting integrin glycosylation may offer therapeutic strategies for managing breast cancer invasiveness.