Journal
ONCOTARGET
Volume 7, Issue 5, Pages 6159-6174Publisher
IMPACT JOURNALS LLC
DOI: 10.18632/oncotarget.6740
Keywords
extracellular matrix; collagen; cancer associated fibroblasts; tumor microenvironment; second harmonic generation
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Funding
- Worldwide Universities Network
- Cancer Research UK
- Medical Research Council UK
- MRC [G1002565] Funding Source: UKRI
- Cancer Research UK [13315] Funding Source: researchfish
- Medical Research Council [G1002565] Funding Source: researchfish
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Collagen structure has been shown to influence tumor cell invasion, metastasis and clinical outcome in breast cancer. However, it remains unclear how it affects other solid cancers. Here we utilized multi-photon laser scanning microscopy and Second Harmonic Generation to identify alterations to collagen fiber structure within the tumor stroma of head & neck, esophageal and colorectal cancers. Image segmentation algorithms were then applied to quantitatively characterize these morphological changes, showing that elongated collagen fibers significantly correlated with poor clinical outcome (Log Rank p < 0.05). We used TGF-beta treatment to model fibroblast conversion to smooth muscle actin SMA-positive cancer associated fibroblasts (CAFs) and found that these cells induce the formation of elongated collagen fibers in vivo. However, proteomic/transcriptomic analysis of SMA-positive CAFs cultured ex-vivo showed significant heterogeneity in the expression of genes with collagen fibril organizing gene ontology. Notably, stratifying patients according to stromal SMA-positivity and collagen fiber elongation was found to provide a highly significant correlation with poor survival in all 3 cancer types (Log Rank p <= 0.003). In summary, we show that increased collagen fiber length correlates with poor patient survival in multiple tumor types and that only a sub-set of SMA-positive CAFs can mediate the formation of this collagen structure.
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