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Bone morphogenetic protein/SMAD signaling orients cell fate decision by impairing KSRP-dependent microRNA maturation

Michela Pasero1, Matteo Giovarelli, Gabriele Bucci

  • 1University of Genova, IRCCS Azienda Universitaria Ospedaliera San Martino-IST, 16132 Genova, Italy.

Cell Reports
|November 27, 2012
PubMed

Insights

Bone morphogenetic protein 2 (BMP2) signaling activates osteoblastic differentiation by blocking myogenic microRNA (myomiR) maturation via KSRP protein interaction. This mechanism is crucial for cell fate determination.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Developmental Biology

Background:

  • MicroRNAs (miRNAs) are key regulators of cellular processes, with their maturation tightly controlled.
  • Regulatory proteins like KSRP influence miRNA biogenesis in response to cellular signals.
  • Bone morphogenetic protein 2 (BMP2) signaling pathways are critical for cell differentiation.

Purpose of the Study:

  • To investigate the role of KSRP in C2C12 cell differentiation.
  • To elucidate the mechanism by which BMP2 signaling affects miRNA maturation.
  • To determine the role of KSRP and BMP2 in directing cell fate towards osteoblastic lineage.

Main Methods:

  • KSRP silencing in C2C12 mesenchymal cells.
  • Transcriptome analysis to compare KSRP silencing with BMP2 activation.
  • Investigation of protein-RNA interactions using phosphorylated R-SMAD and KSRP.
  • Silencing of SMAD proteins (SMAD4, SMAD5, SMAD9) to assess rescue effects.

Main Results:

  • KSRP silencing mimics BMP2-induced transcriptome changes, promoting osteoblastic and inhibiting myogenic differentiation.
  • Blockade of myogenic miRNA (myomiR) maturation by KSRP silencing and BMP2 is essential for osteoblastic differentiation.
  • Phosphorylated R-SMAD proteins bind to phosphorylated KSRP, preventing KSRP interaction with primary myomiRs.
  • Silencing of SMAD4, SMAD5, and SMAD9 rescues KSRP function, indicating their inhibitory role.

Conclusions:

  • SMAD proteins block KSRP-mediated myomiR maturation.
  • This blockade is critical for directing C2C12 cell differentiation towards the osteoblastic lineage.
  • The interplay between SMAD signaling and KSRP is a key regulatory mechanism in cell fate determination.

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