Mesenchymal cells recruit and regulate T regulatory cells

Area of Science:

• Immunology
• Cell Biology
• Regenerative Medicine

Background:

• T regulatory cells (Tregs) play a crucial role in immune suppression.
• Mechanisms controlling Treg recruitment and function remain incompletely understood.
• Multipotent mesenchymal stromal cells (MSCs) possess immune-regulatory properties.

Purpose of the Study:

• To investigate the role of MSCs in the recruitment and function of Tregs.
• To elucidate how MSCs influence Treg phenotype and suppressive capacity.

Main Methods:

• Co-culture of human MSCs with various T cell populations.
• Analysis of T cell populations by flow cytometry.
• Measurement of FoxP3 and CD127 expression via real-time PCR.
• Assessment of Treg suppressive activity.

Main Results:

• MSCs recruit Tregs from CD3(+) and immunoselected T cell fractions.
• MSC co-culture leads to increased CD4(+)CD25(bright)FoxP3(+) subset and downregulated CD127 expression.
• Purified Tregs maintain FoxP3 expression and downregulate CD127 when cultured with MSCs.
• Tregs cultured with MSCs retain suppressive capacity for up to 15 days, unlike control Tregs.

Conclusions:

• MSCs effectively recruit T regulatory cells.
• MSCs regulate Treg phenotype, including FoxP3 expression and CD127 downregulation.
• MSCs maintain Treg function and suppressive capacity over extended periods.