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Updated: Aug 11, 2025

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation
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miRNA-27a is essential for bone remodeling by modulating p62-mediated osteoclast signaling

Shumin Wang1, Eri O Maruyama2, John Martinez1

  • 1University of Rochester Medical Center, Rochester, United States.

Elife
|February 8, 2023
PubMed

Insights

MicroRNAs (miRNAs) regulate organogenesis, but specific roles in bone homeostasis are unclear. Loss of MIR27a in mice causes severe osteoporosis by impairing osteoclast function, revealing a new therapeutic target.

Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression, crucial for development and homeostasis.
  • While miRNAs influence skeletal development, specific miRNAs essential for bone health remain largely unidentified.
  • Functional redundancy among miRNAs often masks phenotypic defects upon individual miRNA deletion.

Purpose of the Study:

  • To identify specific microRNAs (miRNAs) critical for maintaining bone homeostasis.
  • To elucidate the role of MIR27a in skeletal remodeling and bone disease.
  • To investigate the molecular mechanisms underlying MIR27a's function in osteoclasts.

Main Methods:

  • Utilized a mouse model with MIR27a deletion to study osteoporosis.
  • Performed gene expression profiling and bioinformatics analysis to identify MIR27a targets.
  • Assessed osteoclast-mediated bone resorption and osteoblast-mediated bone formation.
  • Investigated the role of the MIR27a-Squstm1/p62 axis in osteoclast differentiation.

Main Results:

  • MIR27a deficiency in mice resulted in severe osteoporosis.
  • MIR27a specifically regulates osteoclast-mediated bone resorption, not bone formation.
  • Identified Squstm1/p62 as a direct target of MIR27a in osteoclasts.
  • Demonstrated that the MIR27a-p62 interaction is essential for osteoclast differentiation.

Conclusions:

  • MIR27a is a critical regulator of bone homeostasis through its control of osteoclast function.
  • The novel MIR27a-p62 axis is necessary and sufficient for osteoclast differentiation.
  • Targeting the MIR27a-p62 pathway offers a potential therapeutic strategy for osteoporosis.
Keywords:
CRISPR/Cas9 gene-editingbone homeostasisbone resorptiondevelopmental biologymouseosteoclastosteoporosisskeletal remodeling

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