MSC-Treg direct contact

Direct contact between mesenchymal stromal (or stem) cells (MSC) and regulatory T cells (Treg) refers to the physical interaction between these two cell types, which contributes significantly to their immunoregulatory effects. MSCs can induce Treg expansion and enhance their suppressive function through mechanisms that require cell-cell contact, as well as via soluble factors such as TGF-β and PGE2[1][2][4][5][7]. Specific surface molecules, including CD80 on MSCs (interacting possibly with CD28/CTLA-4 on Tregs) and CD43 on T cells (interacting with ICAM-1 on MSCs), have been implicated in mediating these interactions[3][4][7]. This crosstalk plays a key role in dampening immune responses in settings like autoimmunity, transplantation, and inflammation, but "MSC-Treg direct contact" itself does not represent a single defined protein or receptor target suitable for drugs in the conventional sense[1][2][5][7]. Key mechanistic details from the literature: - Direct contact is required for optimal induction of Treg phenotype and function by MSCs; separation by a membrane abrogates the effect[1][4][5][7]. - Surface molecules like CD80 (on MSCs) and CD43 (on T cells) are critical in this contact-dependent immunoregulation[3][4][7]. - Contact can result in transfer of cell components such as mitochondria and plasma membrane fragments from MSCs to Tregs[2]. - The interaction amplifies immunosuppressive functions and is a topic of interest for cell therapy, autoimmunity, and transplantation research[1][2][5]. This entry should be flagged as not a discrete target suitable for structured molecular information; instead, consider identifying the specific interacting molecules (e.g., CD80, ICAM-1, CD43) involved if further drug target analysis is desired.

Other names

Mesenchymal stem/stromal cell and regulatory T cell direct contactMSC-Treg interactionDirect MSC-Treg contact