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Updated: Jun 20, 2026

Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells (MSCs)

Assessment of the Immunomodulatory Properties of Human Mesenchymal Stem Cells (MSCs)

Published on: December 24, 2015

Mesenchymal stem cells require a sufficient, ongoing immune response to exert their immunosuppressive function.

P Renner¹, E Eggenhofer, A Rosenauer

¹Department of Surgery, University of Regensburg, Regensburg, Germany.

Transplantation Proceedings

|September 1, 2009

Summary

Mesenchymal stem cells (MSC) can unexpectedly activate T cells in transplantation, contrary to their expected immunosuppressive role. Their function shifts based on the inflammatory environment, impacting solid organ transplant outcomes.

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Mesenchymal Stem Cell Regulation of Macrophage Phagocytosis; Quantitation and Imaging

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Published on: July 16, 2021

Area of Science:

Immunology
Transplantation Biology
Cellular Therapy

Background:

Mesenchymal stem cells (MSC) are promising for cellular immunotherapy in solid organ transplantation due to the need for reduced immunosuppression.
The immunomodulatory effects of MSCs, particularly their impact on T-cell proliferation, remain incompletely understood, with conflicting reports in the literature.
Understanding MSC behavior is crucial for optimizing their clinical application in transplantation.

Purpose of the Study:

To investigate the influence of donor MSCs on alloproliferation in a rat heart transplantation model.
To elucidate the context-dependent effects of MSCs on T-cell proliferation under varying inflammatory conditions.

Main Methods:

Utilized a fully allogeneic rat heart transplantation model (LEW to ACI).
Administered donor MSCs to recipients prior to transplantation.
Conducted co-culture experiments with allogeneic MSCs and T cells under different activation conditions (varying concanavalin A concentrations and cytokine profiles).

Main Results:

Pretreatment with donor MSCs led to earlier rejection of allogeneic heart transplants, indicating T-cell activation in vivo.
MSCs inhibited T-cell proliferation under highly proinflammatory conditions (high ConA, IFN-γ, IL-2, TNF-α).
The suppressive effect of MSCs was abrogated under low-inflammatory conditions (low ConA, IL-10).

Conclusions:

Donor MSCs can promote T-cell activation, leading to accelerated allograft rejection in certain transplantation contexts.
MSC function exhibits a switch effect, inhibiting T-cell proliferation in proinflammatory environments but losing this effect in less inflammatory settings.
Further research into this context-dependent functional switch is essential for the effective application of MSCs in solid organ transplantation.