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Related Experiment Video

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Tackling Tumour Cell Heterogeneity at the Super-Resolution Level in Human Colorectal Cancer Tissue.

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|August 7, 2021
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Summary

Single molecule localisation microscopy (SMLM) now analyzes chromatin and microRNAs in patient tissue, improving early cancer diagnosis. This technique differentiates normal and cancerous colorectal cells at the nanoscale.

Keywords:
chromatin densitymetastasismicroRNAsnanoscalesuper-resolution microscopytumour cell heterogeneity

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Area of Science:

  • Biomedical Imaging
  • Cancer Biology
  • Nanotechnology

Background:

  • Tumour cell heterogeneity poses challenges in cancer diagnosis and therapy.
  • Single molecule localisation microscopy (SMLM) has been limited to cell lines, hindering its application in patient tissues.
  • Nuclear chromatin and microRNAs are crucial in cancer metastasis.

Purpose of the Study:

  • To develop and apply a novel quantitative SMLM approach for analyzing chromatin nanostructure and microRNAs in patient-derived colorectal carcinoma (CRC) tissue.
  • To investigate differences in chromatin architecture between normal and cancerous colorectal cells at the nanoscale.
  • To assess the potential of SMLM for improving the differential diagnosis of colorectal cancer.

Main Methods:

  • Quantitative SMLM was performed on resected, routine-pathology colorectal carcinoma (CRC) patient tissue sections.
  • Analysis focused on chromatin density profiles, nuclear size, and chromatin compaction percentages.
  • SMLM was used to detect microRNAs relevant to metastasis within the nuclei of cancer cells.

Main Results:

  • Significant differences in chromatin density profiles were observed between normal and carcinoma colorectal tissues.
  • Tumour sections showed distinct nuclear size and chromatin compaction percentages compared to normal epithelial and other cells.
  • SMLM revealed nanoscale chromatin density changes in normal tissue nuclei, undetectable by conventional microscopy.
  • SMLM successfully detected metastasis-relevant microRNAs at the nuclear level in colorectal cancer tissue.

Conclusions:

  • Quantitative SMLM provides powerful nanoscale insights into chromatin structure and microRNAs in individual cells from patient tissues.
  • This approach enhances the differential diagnosis of normal versus cancerous colorectal cells within heterogeneous primary tumours.
  • The study establishes a new perspective for single-cell level analysis in routine pathology, aiding cancer diagnosis and therapy.