Transmembrane Protein ANTXR1 Regulates γ -Globin Expression by Targeting the Wnt/β -Catenin Signaling Pathway.

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Date: July 30, 2022
Publisher: Hindawi Limited
Document Type: Article
Length: 7,768 words
Lexile Measure: 1140L

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Abstract :

Reactivation of fetal hemoglobin (HbF, α 2γ 2) alleviates clinical symptoms in patients with β -thalassemia and sickle cell disease, although the regulatory mechanisms of γ -globin expression have not yet been fully elucidated. Recent studies found that interfering with the expression of the membrane protein ANTXR1 gene upregulated γ -globin levels. However, the exact mechanism by which ANTXR1 regulates γ -globin levels remains unclear. Our study showed that overexpression and knockdown of ANTXR1 in K562, cord blood CD34[sup.+], and HUDEP-2 cells decreased and increased γ -globin expression, respectively. ANTXR1 regulates the reactivation of fetal hemoglobin (HbF, α 2γ 2) in K562, cord blood CD34[sup.+], and adult peripheral blood CD34[sup.+] cells through interaction with LRP6 to promote the nuclear entry of β -catenin and activate the Wnt/β -catenin signaling pathway. The overexpression or knockdown of ANTXR1 on γ -globin and Wnt/β -catenin signaling in K562 cells was reversed by the inhibitor XAV939 and the activator LiCl, respectively, where XAV939 inhibits the transcription of β -catenin in the Wnt pathway, but LiCl inhibits GSK3-β . We also showed that the binding ability of the rank4 site in the transcriptional regulatory region of the SOX6 gene to c-Jun was significantly increased after overexpression of ANTXR1 in K562 cells. SOX6 protein expression was increased significantly after overexpression of the c-Jun gene, indicating that the transcription factor c-Jun initiated the transcription of SOX6, thereby silencing γ -globin. Our findings may provide a new intervention target for the treatment of β -hemoglobinopathies.

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Gale Document Number: GALE|A712888995