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Related Concept Videos

Clinical Applications of Epidermal Stem Cells01:19

Clinical Applications of Epidermal Stem Cells

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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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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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Related Experiment Video

Updated: Sep 17, 2025

Rapid Genetic Analysis of Epithelial-Mesenchymal Signaling During Hair Regeneration
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Enhancing hair regrowth using rapamycin-primed mesenchymal stem cell-derived exosomes.

Manju Shrestha1, Tiep Tien Nguyen1, Rabyya Kausar1

  • 1Department of Precision Medicine, School of Medicine, Sungkyunkwan University, Suwon 16419, Republic of Korea.

Theranostics
|June 30, 2025
PubMed
Summary

Rapamycin-primed exosomes from mesenchymal stem cells (MSCs) significantly enhance hair regrowth. This novel therapy promotes hair follicle regeneration and density, offering a promising new treatment for hair loss.

Keywords:
Wnt/β-catenin signalingexosomehair regrowthmesenchymal stem cellrapamycin

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Area of Science:

  • Regenerative Medicine
  • Dermatology
  • Cell Biology

Background:

  • Hair loss is a widespread condition with limited effective treatments.
  • Mesenchymal stem cells (MSCs) and their exosomes show therapeutic promise for hair regeneration.
  • Rapamycin enhances MSC function by promoting growth factor release.

Purpose of the Study:

  • To investigate the efficacy of rapamycin-primed MSC-derived exosomes (REXO) for promoting hair regrowth.
  • To evaluate the in vitro and in vivo effects of REXO in a murine model.

Main Methods:

  • MSCs were primed with rapamycin, and exosomes were extracted.
  • In vitro studies assessed REXO effects on dermal fibroblast proliferation and gene expression.
  • In vivo studies involved intradermal injection of REXO into depilated mice, monitoring hair regrowth, gene expression, and histology.

Main Results:

  • REXO treatment increased dermal fibroblast proliferation and upregulated genes associated with Wnt/β-catenin signaling, autophagy, and growth factors.
  • In vivo, REXO therapy significantly enhanced hair follicle development, hair density, and hair activation markers compared to controls.
  • Histological examination confirmed improved hair follicle regeneration.

Conclusions:

  • Rapamycin priming enhances the therapeutic potential of MSC-derived exosomes for hair regrowth.
  • REXO therapy represents a promising and effective approach for treating hair loss.