ArticleInternational journal of biological sciences2026
CD109 Drives Stemness and Chemoresistance in Colorectal Cancer via LRRC8A/AKAP12/PKCα-Mediated STAT3 Activation and WNT Signaling.
Article in International journal of biological sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Colorectal cancer (CRC) is the third most prevalent type of cancer worldwide, with a poor survival rate at the metastatic stage. Here, we identify CD109-a negative regulator of TGFβ signaling-as a key driver of stemness and drug resistance through modulation of Wnt signaling in advanced CRC. CD109 expression strongly correlates with TGFβ levels in patient tumors and is enriched in the aggressive CRIS-B subtype, where it associates with poor clinical outcome. CD109 silencing reduced STAT3 phosphorylation and cell proliferation, without affecting migration or invasion. Moreover, global expression analysis revealed downregulation of various hallmarks of cancer stemness (i.e. LGR5 expression), together with increased TGFβ signaling and cellular senescence. Mechanistically, CD109 interacts with LRRC8A, a subunit of the volume-regulated anion channel (VRAC), which associates with AKAP12 to activate PKCα and promote STAT3 phosphorylation. This CD109/LRRC8A/AKAP12/PKCα axis sustains Wnt signaling, stemness, and drug resistance. Consistently, co-expression of CD109/LRRC8A/AKAP12 correlates with poor prognosis in CRC patients. Genetic or pharmacological disruption of this CD109/LRRC8A/AKAP12/PKCα axis impaired STAT3 signaling, reduced LGR5 expression and Wnt signaling, and sensitized cells to chemotherapy.
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