Cnnm4 deficiency suppresses Ca2+ signaling and promotes cell proliferation in the colon epithelia
Cnnm4 deficiency suppresses Ca2+ signaling and promotes cell proliferation in the colon epithelia
复制标题
CNnm4 缺陷抑制 Ca2 信号传导并促进结肠上皮细胞增殖
作者:
Yamazaki D;Hasegawa A;Funato Y;Tran HN;Mori MX;Mori Y;Sato T;Miki H
CNNM4 is a Mg2+transporter highly expressed in the colon epithelia. Its importance in regulating intracellular Mg2+levels and cancer development has been documented, but how CNNM4 function affects the dynamic homeostasis of the epithelial tissue remains unclear. Here, we show thatCnnm4deficiency promotes cell proliferation and partly suppresses cell differentiation in the colon epithelia, making them vulnerable to cancer development. Such phenotypic characteristics are highly similar to those of mice lackingTrpv1, which encodes the cation channel involved in capsaicin-stimulated Ca2+influx. Indeed, Ca2+-imaging analyses using the organoid culture reveal that Ca2+influx stimulated by capsaicin is greatly impaired byCnnm4deficiency. Moreover, EGF receptor signaling is constitutively activated in the colon epithelia ofCnnm4-deficient mice, as is the case withTrpv1-deficient mice. The administration of gefitinib, a clinically available inhibitor of EGF receptor, cancels the augmented proliferation of cells observed inCnnm4-deficient mice. Collectively, these results establish the functional interplay between Mg2+and Ca2+in the colon epithelia, which is crucial for maintaining the dynamic homeostasis of the epithelial tissue.
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