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Japneet Kaur1,2, Dominik Saul1,2, Madison L Doolittle1,2

  • 1Division of Endocrinology, Department of Medicine Mayo Clinic College of Medicine Rochester MN USA.

JBMR Plus
|June 7, 2023
PubMed
Summary
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MicroRNA-19a-3p (miR-19a-3p) levels decline with age in bone, contributing to cellular senescence and age-related bone loss. Restoring miR-19a-3p shows potential as a senotherapeutic strategy for bone health.

Area of Science:

  • Gerontology
  • Molecular Biology
  • Bone Biology

Background:

  • Aging is linked to chronic diseases and cellular senescence.
  • MicroRNAs (miRNAs) play a role in bone aging and senescence.
  • Cellular senescence involves the accumulation of senescent cells.

Purpose of the Study:

  • To investigate the role of miR-19a-3p in bone aging and cellular senescence.
  • To explore the potential of miR-19a-3p as a senotherapeutic target for age-related bone loss.

Main Methods:

  • Measured miR-19a-3p levels in aging mouse and human bone samples.
  • Induced senescence in mouse bone marrow stromal cells and osteoblasts.
  • Performed RNA sequencing to analyze gene expression changes.
  • Evaluated the effect of miR-19a-3p restoration on senescent cells.
Keywords:
AGINGCELLS OF BONEOSTEOBLASTS

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Main Results:

  • miR-19a-3p levels decrease with age in mouse and human bone.
  • miR-19a-3p expression is reduced in senescent bone marrow stromal cells.
  • Overexpression of miR-19a-3p in osteoblasts suppressed senescence markers (p16 Ink4a, p21 Cip1) and enhanced proliferation.
  • Restoring miR-19a-3p in senescent cells reduced senescence markers and increased proliferation.

Conclusions:

  • miR-19a-3p is a senescence-associated miRNA that diminishes with age.
  • miR-19a-3p represents a potential senotherapeutic target for age-related bone loss and osteoporosis.