
CHRDL2の過剰発現は大腸がん細胞の DNA 修復経路を活性化し、化学療法および放射線療法に対する耐性を高める。さらに、CHRDL2は幹細胞マーカーの発現を増加させ、腸オルガノイドの分化を抑制することで、がん幹細胞の性質を増強する。


coremsg

BMP antagonists have been increasingly linked to the development of Colorectal cancer (CRC). BMP signalling operates in opposition to the WNT signalling pathway, which sustains stem-cell maintenance and self-renewal of the normal intestinal epithelium. Reduced BMP and elevated WNT signalling lead to expansion of the stem-cell compartment and the hyperproliferation of epithelial cells, a defining characteristic of CRC. Chordin-like-2 (CHRDL2) is a secreted BMP antagonist, with overexpression linked to poor prognosis and variants in the gene shown to be associated with an elevated CRC risk. Despite this the functional role of CHRDL2 in CRC is unknown.

In this study, we explored the impact of CHRDL2 overexpression on CRC cells to investigate whether CHRDL2’s inhibition of BMP signalling intensifies WNT signalling and enhances the cancer stem-cell phenotype and response to treatment. Our research approach combines 2D cancer cell lines engineered to inducibly overexpress CHRDL2 and 3D organoid models treated with extrinsic CHRDL2, complemented by RNA sequencing analysis.

CHRDL2 was found to enhance the survival of CRC cells during chemotherapy and irradiation treatment due to activation of DNA damage response pathways. Organoids treated with secreted CHRDL2 exhibited elevated levels of stem-cell markers and reduced differentiation, as evidenced by diminished villi budding. RNA-seq analysis revealed that CHRDL2 increased the expression of stem-cell markers, WNT signalling and other well-established cancer-associated pathways.

These findings collectively suggest that CHRDL2 overexpression could affect response to CRC therapy by enhancing DNA repair and the stem-cell potential of cancer cells, and its role as a biomarker should be further explored.

![Figure][1]</img>

### Competing Interest Statement

The authors have declared no competing interest.

*   CRC
    :   Colorectal cancer
    CHRDL2
    :   Chordin-like 2
    BMP
    :   Bone-morphogenic protein
    WNT
    :   WNT signalling pathway
    ISC
    :   Intestinal stem cell
    CSC
    :   Cancer stem cell
    LGR5
    :   Leucine-rich repeat-containing G-protein coupled receptor 5
    LGR6
    :   Leucine-rich repeat-containing G-protein coupled receptor 6
    BMI1
    :   B lymphoma Mo-MLV insertion region 1 homolog)
    DSB
    :   Double stranded Break
    ATM
    :   Ataxia-telangiectasia mutated
    γH2AX
    :   H2A histone family member X

 [1]: pending:yes

BMP antagonist CHRDL2 enhances the cancer stem-cell phenotype and increases chemotherapy resistance in Colorectal Cancer

bmp-アンタゴニストchrdl2は大腸がんの幹細胞表現型を高め-化学療法耐性を増加させる


BMP アンタゴニストCHRDL2は大腸がんの幹細胞表現型を高め、化学療法耐性を増加させる
