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The type III TGFbeta receptor regulates directional migration: new tricks for an old dog

Karthikeyan Mythreye, Gerard C Blobe

    Cell Cycle (Georgetown, Tex.)
    |September 17, 2009
    PubMed

    Insights

    The type III transforming growth factor beta (TGFbeta) receptor (TβRIII) suppresses cancer progression by reducing cell motility, independent of its TGFbeta signaling role. This receptor reorganizes the actin cytoskeleton, inhibiting cancer cell migration.

    Area of Science:

    • Oncology
    • Cell Biology
    • Molecular Biology

    Background:

    • Type III transforming growth factor beta (TGFbeta) receptor (TβRIII), also known as betaglycan, is a crucial co-receptor in the TGFbeta superfamily.
    • Downregulation of TβRIII expression is observed in various human cancers, including breast, kidney, lung, ovarian, pancreatic, and prostate cancers.

    Discussion:

    • TβRIII plays a significant role in suppressing cancer progression, primarily by inhibiting cancer cell motility.
    • This motility-suppressing function is distinct from TβRIII's established role in TGFbeta signaling.
    • TβRIII activates Cdc42 through interaction with beta-arrestin2, leading to actin cytoskeleton re-organization, reduced directional persistence, and inhibited random migration.

    Key Insights:

    • TβRIII's non-canonical pathway involving Cdc42 and beta-arrestin2 is critical for suppressing epithelial cancer cell migration.
    • The actin cytoskeleton re-organization mediated by TβRIII is a key mechanism for inhibiting cancer cell motility.
    • Loss of TβRIII expression contributes to increased cancer cell motility and progression.

    Outlook:

    • Further research into TβRIII's non-signaling functions is essential for understanding its role in cancer.
    • Targeting TβRIII or its associated pathways could offer novel therapeutic strategies for various cancers.
    • Investigating TβRIII and other co-receptors may reveal new insights into cancer biology and treatment.

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