Collagen I, primarily composed of two chains encoded by the genes COL1A1 and COL1A2.
- Collagen I is the most abundant collagen in the human body and is a major component of the extracellular matrix (ECM), providing structural support to tissues.
- It is typically a heterotrimer composed of two α1(I) chains (COL1A1) and one α2(I) chain (COL1A2).
- Cancer progression is often accompanied by significant remodeling of the ECM.
- Collagen I deposition frequently increases in many solid tumors, contributing to a dense and fibrotic stroma (desmoplasia).
- Increased collagen I deposition can lead to higher ECM stiffness, which in turn modifies cell signaling and behavior.
Expression Patterns:
- Tumors such as breast, pancreatic, colorectal, and lung cancers often exhibit elevated levels of collagen I.
- High collagen I expression or deposition in the tumor stroma is frequently correlated with a more aggressive tumor phenotype.
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