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Related Concept Videos

Mesenchymal Stem Cells01:19

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Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their...
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MicroRNAs in BM-MSC-Derived Extracellular Vesicles Promote Angiogenesis: An in Vitro Model Study.

Tomomi Kusakabe1, Yoshiki Wada1,2, Tomohiro Umezu3

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|October 29, 2025
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Summary
This summary is machine-generated.

Mesenchymal stromal cell (MSC)-derived extracellular vesicles (EVs) deliver microRNAs (miRNAs) that promote angiogenesis, offering a novel therapeutic approach for critical limb ischemia (CLI). This study identifies specific miRNAs within EVs that enhance blood vessel formation, supporting EV-based treatments for ischemic diseases.

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angiogenesisextracellular vesiclesmesenchymal stromal cellmicroRNA

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Area of Science:

  • Regenerative Medicine
  • Molecular Biology
  • Vascular Biology

Background:

  • Critical limb ischemia (CLI) is a severe peripheral arterial disease with limited therapeutic options.
  • Mesenchymal stromal cell (MSC) therapy shows promise, but efficacy varies, suggesting paracrine mechanisms involving extracellular vesicles (EVs) and microRNAs (miRNAs) are key.
  • Angiogenesis, the formation of new blood vessels, is crucial for treating ischemic conditions.

Purpose of the Study:

  • To investigate the role of specific angiogenesis-related microRNAs (miRNAs) packaged within bone marrow-derived MSC (BM-MSC) extracellular vesicles (EVs).
  • To determine if these EV-associated miRNAs can enhance angiogenesis and to explore their therapeutic potential for critical limb ischemia (CLI).

Main Methods:

  • Bone marrow-derived MSCs (BM-MSCs) and their EVs were analyzed for the presence of five angiogenesis-related miRNAs (miR-126, miR-135b, miR-210 were detected in EVs).
  • Co-culture experiments with BM-MSCs and human umbilical vein endothelial cells (HUVECs) assessed angiogenesis via tube formation assays.
  • Synthetic miRNAs were transfected into HUVECs to evaluate their individual and combined effects on angiogenesis and protein expression (VEGF, FGF, Endoglin).

Main Results:

  • BM-MSC and HUVEC co-culture significantly enhanced angiogenesis in a dose-dependent manner.
  • EVs selectively packaged specific angiogenic miRNAs (miR-126, miR-135b, miR-210), with expression levels influenced by donor age and individual variability.
  • Combinations of miR-126 and miR-135b, and all three tested miRNAs, showed the strongest enhancement of angiogenesis and upregulated key angiogenic proteins.

Conclusions:

  • BM-MSC-derived EV miRNAs promote angiogenesis through combinatorial mechanisms, providing a mechanistic basis for MSC therapy in CLI.
  • These findings underscore the translational potential of EV-based nucleic acid therapeutics for treating ischemic diseases.
  • The study highlights the importance of specific miRNA cargo within EVs for therapeutic efficacy.