4-O-Methylhonokiol Protects HaCaT Cells from TGF-β1-Induced Cell Cycle Arrest by Regulating Canonical and Non-Canonical Pathways of TGF-β Signaling

    February 2017 in “ Biomolecules & Therapeutics ”
    Sang-Cheol Kim, Jingoo Kang, Jin‐Won Hyun, Jihoon Kang, Young‐Sang Koh, Young‐Heui Kim, Kiho Kim, Jihee Ko, Eun-Sook Yoo, Hee‐Kyoung Kang
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    TLDR 4-O-Methylhonokiol helps protect skin cells from growth-stopping effects of a protein by regulating growth-related pathways.
    The 2017 study found that 4-O-Methylhonokiol (MH), a compound derived from the Magnolia tree, could protect human skin cells (HaCaT cells) from cell cycle arrest induced by TGF-β1, a protein that can inhibit cell growth and potentially lead to conditions like alopecia. MH was found to regulate both the canonical (Smad-dependent) and non-canonical (Smad-independent) pathways of TGF-β signaling, which are involved in cell growth and differentiation. Specifically, MH inhibited TGF-β1-induced cell cycle arrest by decreasing G1/G0 phase arrest and p21 expression, blocking nuclear translocation of Smad2/3, Smad4 and Sp1, and reducing TGF-β1-induced reactive oxygen species production and NADPH oxidase 4 mRNA level. These findings suggest that MH could potentially be used as a therapeutic agent for conditions related to cell cycle arrest, such as hair loss.
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