Morphological single cell profiling of the epithelial-mesenchymal transition

Area of Science:

• Cell Biology
• Biomedical Imaging
• Quantitative Biology

Background:

• Cellular heterogeneity complicates experimental analysis, especially during stress-induced transformations like the epithelial-mesenchymal transition (EMT).
• Traditional population-based measurements fail to capture single-cell plasticity and diverse responses.
• The epithelial-mesenchymal transition (EMT) confers resistance and an elongated phenotype, crucial in development and disease.

Purpose of the Study:

• To develop and validate a single-cell morphology-based method for classifying phenotypic subpopulations.
• To quantify morphological changes associated with EMT induced by various stimuli.
• To assess the potential of this approach as a predictive preclinical assay.

Main Methods:

• High content imaging of single cells to capture detailed morphology.
• Characterization of EMT using the Snail regulator in mammary epithelial cells.
• Development of a Gaussian mixture model integrating morphological features (vimentin area, nucleus, and cytoplasm elongation).
• Application of the model to heterogeneous cell populations induced by TGF-β1, cell density, and Taxol.

Main Results:

• EMT induction led to increased vimentin area and significant elongation of nucleus and cytoplasm.
• The Gaussian mixture model accurately classified epithelial and mesenchymal phenotypes (>92% accuracy).
• The method successfully analyzed heterogeneous cell populations under diverse EMT-inducing conditions.

Conclusions:

• Single-cell morphological analysis provides a powerful tool to resolve cellular heterogeneity during EMT.
• This quantitative approach offers a promising predictive assay for evaluating targeted therapeutics in preclinical settings.
• The method's ability to screen diverse phenotypic variability enhances its utility in complex biological systems.