Stem cells derived exosomes as biological nano carriers for VCR sulfate for treating breast cancer stem cell

Exosomes are tiny, naturally occurring vesicles secreted by cells that play a key role in cell-to-cell communication. These vesicles can carry proteins, RNA, and other molecules to specific cells and tissues, making them ideal candidates for targeted drug delivery. In this study, researchers at MSA University used exosomes derived from mesenchymal stem cells (MSCs) to deliver VCR sulfate directly to cancer cells.

Loading VCR Sulfate onto Exosomes

The process began by isolating exosomes from MSCs. Using a technique called probe-sonication, the researchers loaded these exosomes with VCR sulfate. The goal was to create a VCR sulfate-exosome complex (VCR sulfate-Exo) that could be more effectively delivered to cancer cells.

Testing the Effectiveness of VCR Sulfate-Exo

To evaluate the effectiveness of this new delivery method, the researchers conducted a series of experiments:

  1. Cytotoxicity Test: They used a sulforhodamine B (SRB) assay to measure the cytotoxicity (cell-killing ability) of VCR sulfate-Exo in T47D breast cancer cells. The results were compared to those of free (unencapsulated) VCR sulfate.
  2. Targeting Efficiency: They labeled specific markers (CD44+/CD24−) on the cancer cells and used flow cytometry to assess how effectively VCR sulfate-Exo targeted these cells compared to free VCR sulfate.

Promising Results

The study found that VCR sulfate-Exo had similar cytotoxicity to free VCR sulfate, meaning it was just as effective at killing cancer cells. However, flow cytometry analysis showed that VCR sulfate-Exo was better targeted to MSCs than free VCR sulfate. This improved targeting suggests that exosome-mediated delivery could potentially direct the drug more precisely to cancer cells, reducing damage to healthy cells.

The Future of Cancer Treatment

The findings of this study indicate that using MSC-derived exosomes to deliver VCR sulfate can enhance the drug’s targeted delivery and potentially lessen its side effects. However, more research is needed to confirm the effectiveness and safety of VCR sulfate-Exo in living organisms (in vivo). Additionally, further studies could help refine the loading and delivery strategies to maximize the benefits of this approach.


This research represents a significant step forward in cancer treatment, demonstrating that exosome-based delivery systems can improve the targeting and reduce the toxicity of chemotherapy drugs like VCR sulfate. As this technology advances, it holds promise for more effective and safer cancer therapies, ultimately improving outcomes for patients.

Figure 7

Illustration of VCR Sulfate Loading Mechanism on MSC-Derived Exosomes at the Nanoscale Using Ultrasonication Technique and the Differential Effects of MSC-Derived Exosomes, VCR Sulfate, and MSC-Derived Exosomes Loaded with VCR Sulfate on CSCs in the T47D Cell Line.

Farouk AH, Aref A, Fathy BA, Abdallah AN. (2024) Stem cells derived exosomes as biological nano carriers for VCR sulfate for treating breast cancer stem cells. Sci Rep 14(1):10964. [article]

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