Vitamin E and selenium improve mesenchymal stem cell conditioned media immunomodulatory effects

Area of Science:

• Immunology
• Stem Cell Biology
• Nutritional Biochemistry

Background:

• Mesenchymal stem cells (MSCs) possess immunoregulatory properties.
• Antioxidants like vitamin E (Vit E) and selenium (Se) can improve stem cell survival.
• Investigating the impact of antioxidant-treated MSC conditioned media (CM) on immune cells is crucial.

Purpose of the Study:

• To evaluate the effects of MSC CM, pre-treated with Vit E and Se, on dendritic cells (DCs) and peripheral blood mononuclear cells (PBMCs).
• To assess the expression of key immune markers and cytokine profiles after treatment with modified MSC CM.

Main Methods:

• MSCs were cultured with Vit E and Se.
• Immature DCs and PBMCs were cultured with the treated MSC CM.
• Expression of DC maturation markers (HLA-DR, CD86, CD40, CD83) was analyzed.
• Cytokine levels (TGF-β, IL-10, IL-12) in supernatants were measured.
• PBMC transcription factors (T-bet, GATA3, RORγt, FOXP3) were assessed.

Main Results:

• MSC CM with Vit E and Se altered DC maturation markers, decreasing HLA-DR and increasing IL-10.
• Antioxidant-treated MSC CM reduced IL-10 and increased IL-12, T-bet, and RORγt in PBMCs.
• Specific effects included decreased CD40 on DCs treated with MSC (Vit E) and MSC (Se) CM.

Conclusions:

• Vit E and Se treatment enhance MSCs' capacity to inhibit DCs, improving their immunomodulatory potential.
• MSC CM modified with Vit E and Se appear to promote RORγt expression in PBMCs, potentially via monocytes.
• These findings suggest a role for antioxidants in optimizing MSC-based immunotherapies.