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SMAD4 Controls Cancer Cell Metabolism by Regulating Methylmalonic Aciduria Cobalamin Deficiency (cbl) B Type

Kyoung Song1,2, Hun Seok Lee3,2, Lina Jia4

  • 1College of Pharmacy, Duksung Women's University, Seoul 01366, Korea.

Molecules and Cells
|June 9, 2022
PubMed

Insights

Suppressor of mothers against decapentaplegic homolog (SMAD) 4 regulates cancer cell metabolism by interacting with methyl malonyl aciduria cobalamin deficiency B type (MMAB). SMAD4 controls MMAB expression, impacting cancer cell ATP production, glucose consumption, and apoptosis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Suppressor of mothers against decapentaplegic homolog (SMAD) 4 is a key mediator in transforming growth factor β (TGF-β) signaling, regulating critical cellular processes.
  • The precise mechanisms of SMAD4 in tumor suppression beyond its transcription factor role are not fully understood.
  • Methyl malonyl aciduria cobalamin deficiency B type (MMAB) was previously identified as a SMAD4 binding protein.

Purpose of the Study:

  • To confirm and characterize the interaction between SMAD4 and MMAB.
  • To investigate the effect of SMAD4 on MMAB expression and the role of MMAB in cancer cell metabolism.

Main Methods:

  • Proto array analysis, bimolecular fluorescence complementation (BiFC), proximity ligation assay (PLA), and immunoprecipitation were used to confirm SMAD4-MMAB interaction.
  • SMAD4 overexpression and siRNA-mediated knockdown of MMAB were employed.
  • Cancer cell metabolism was assessed by measuring ATP production and glucose consumption, and apoptosis was evaluated.

Main Results:

  • The interaction between SMAD4 and MMAB was confirmed through multiple experimental assays.
  • SMAD4 overexpression led to a proteasome-dependent downregulation of MMAB expression, independent of TGF-β signaling.
  • MMAB knockdown in HeLa cells significantly altered cancer cell metabolism, reducing ATP production and glucose consumption, and inducing apoptosis.

Conclusions:

  • SMAD4 directly interacts with MMAB, and this interaction is independent of TGF-β signaling.
  • SMAD4 regulates cancer cell metabolism, at least in part, by controlling MMAB expression.
  • Targeting the SMAD4-MMAB pathway may offer novel strategies for cancer therapy by modulating cancer cell metabolism.
Keywords:
methyl malonyl aciduria cobalamin deficiency B typemitochondrial energy productionproteasomal pathwaysuppressor of mothers against decapentaplegic homolog 4

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