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Pro-fibrotic phenotype of bone marrow stromal cells in Modic type 1 changes.

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Modic type 1 changes (MC1) involve painful bone marrow lesions and fibrosis. This study found bone marrow stromal cells (BMSCs) in MC1 exhibit pro-fibrotic characteristics, suggesting a potential therapeutic target for chronic low-back pain.

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Area of Science:

  • Bone Biology
  • Cell Biology
  • Pain Research

Background:

  • Modic type 1 changes (MC1) are painful vertebral bone marrow lesions linked to chronic low-back pain.
  • Marrow fibrosis is a key feature of MC1, but the role of bone marrow stromal cells (BMSCs) is unclear.

Purpose of the Study:

  • To characterize BMSCs from MC1 lesions.
  • To investigate the potential pro-fibrotic role of BMSCs in MC1.

Main Methods:

  • BMSCs were isolated from MC1 and control vertebrae in patients undergoing spinal fusion.
  • Analyses included colony-forming unit fibroblast (CFU-F) frequency, stem cell marker expression, differentiation capacity, transcriptome, matrix adhesion, cell contractility, and specific protein expression (pro-collagen type I alpha 1, α-smooth muscle actin, integrins, FAK).
  • RNA sequencing and identification of specific BMSC subpopulations (LEPRhigh) were performed.

Main Results:

  • MC1 BMSCs showed increased CFU-F and C-X-C-motif-chemokine 12 expression, suggesting a perisinusoidal BMSC population.
  • Transcriptome analysis revealed enrichment in fibrosis-related genes and pathways.
  • MC1 BMSCs exhibited increased pro-collagen type I alpha 1 expression, enhanced cell adhesion and contractility, and increased FAK phosphorylation, indicating a pro-fibrotic phenotype.
  • A LEPRhigh BMSC subpopulation in MC1 differentiated into myofibroblasts under TGF-β1 stimulation, unlike control BMSCs.

Conclusions:

  • BMSCs in Modic type 1 changes display pro-fibrotic characteristics.
  • A specific subpopulation of MC1 BMSCs (LEPRhigh) is susceptible to myofibroblast differentiation.
  • These findings highlight MC1 BMSC pro-fibrotic changes and fibrosis as potential therapeutic targets for chronic low-back pain.