Transcriptomic alterations underline aging of osteogenic bone marrow stromal cells

Area of Science:

• Stem cell biology
• Gerontology
• Skeletal biology

Background:

• Multipotent bone marrow stromal cells (BMSCs) are crucial for bone remodeling.
• Aging leads to bone loss, reduced structural integrity, osteoporosis, and increased fracture risk.
• Bone loss in mice begins as early as 1 month of age.

Purpose of the Study:

• To identify functional alterations in BMSCs during early bone loss.
• To investigate the transcriptomic dynamics of BMSCs during aging.
• To understand the cellular and molecular mechanisms of early age-related bone loss.

Main Methods:

• BMSCs were collected from mice at various early to middle ages.
• Self-renewal and differentiation potential of BMSCs were compared.
• Transcriptomic profiles of BMSCs were analyzed at 1, 3, and 7 months of age.

Main Results:

• Colony-forming and osteogenic commitment capacity decreased by 1 month of age.
• Transcriptomic analysis revealed enrichment of osteoblastic genes at 1 month, loss of osteogenic features by 3 months, and adipogenic/DNA repair features by 7 months.
• WNT and MAPK signaling pathways were upregulated at 1 month, with subsequent increases in pro-inflammatory and apoptotic features.

Conclusions:

• The study reveals cellular and molecular dynamics of bone aging in mice.
• BMSCs contribute significantly to the early stages of age-related bone loss.
• Early identification of BMSC changes provides insights into osteoporosis development.