Protease-Free Workflow for Spatial Multiomics Analysis of the Tumor Microenvironment in Breast Cancer
Contributors
Tanni Rahman, PhD1, Patrick J. Savickas1, Rachel C. Clary, PhD1, Andrzej Cholewinski, PhD1, Anushka Dikshit, PhDs, Joseph Iacona, PhD2, Kristy Chu2
1HistoWiz, New York, NY
2Advanced Cell Diagnostics, a Bio-Techne brand, Newark, CA
Introduction
Breast cancer is the most commonly diagnosed cancer among women worldwide1. Notably, 1 in 8 women will develop invasive breast cancer during their lifetime1. Continued research of the biology underlying breast cancer is essential to the development of novel therapeutics and biomarker detection methods.
Multiomic spatial resolution of the tumor microenvironment
Here, we utilized RNAscope™ Multiomic LS technology to stain RNA and protein markers, CXCR3, IFNG, CXCL9, CD3, PanCK, and CD8. CXCR3 is indicative of immune cell trafficking, IFNG marks T cell activation, and CXCL9 is involved in inflammatory responses relevant to anti-tumor immunity 2-4. In conjunction, CD3 and CD8 are protein markers for T cells, and PanCK delineates tumor positive areas 5-6. Together, we have utilized a novel protease-free workflow to simultaneously detect RNA and protein markers in breast cancer tissues to further understand the tumor microenvironment.
Materials and Methods
- All stains were performed using the BOND RX fully automated research stainer
- Formalin-fixed, paraffin-embedded human breast cancer and healthy breast tissue sections were used for multiomic staining.
For Research Use Only. Not for use in diagnostic procedures.
RNAscope™ Multiomic LS Assay Schematic
- Samples were imaged at 40X magnification, followed by image analysis.
- The new Multiomic LS assay supports detection of 6-plex RNA+protein targets with TSA-based detection. The workflow, run on the BOND RX, involves protease-free target retrieval followed by probe binding, signal amplification, and detection. This was followed by antibody binding for protein detection.
RNA Target, Antibody, and Fluorophore Pairings
Staining Results
Positive Control Multiomic Staining in Breast Cancer
Experimental Multiomic Staining in Breast Cancer
AI-Driven Image Analysis
Proximity Analysis Results
Conclusions
- Compared to healthy breast tissue, the expression of CXCR3, CXCL9, CD3, CD8, and PanCK was elevated in breast cancer. This suggests strong immune cell infiltration within the tumor microenvironment. Elevated CXCR3 expression is associated with enhanced immune surveillance, while increased CXCL9 may reflect active anti-tumor immunity2,4.
- Multiomic analysis revealed co-expression of CXCR3 with CD8, indicative of T-cell recruitment7. IFNG was co-expressed with PanCK, but was down-regulated in breast cancer relative to healthy tissue, potentially indicating immune suppression and poor prognosis8.
- Proximity analysis revealed that in breast cancer, CD3, CD8, and CXCL9 were spatially adjacent to PanCK+ tumor cells, suggesting a localized pro-inflammatory response driven by cytotoxic T-cell activity9.
- The RNAscope™ Multiomic LS technology provides a powerful tool to deepen our understanding of breast cancer biology and the immune landscape of the tumor microenvironment.
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References
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