Stromal cell-mediated immunomodulation and repair

Stromal cell-mediated immunomodulation and repair is a complex physiological process primarily executed by mesenchymal stromal cells (MSCs) to maintain tissue homeostasis and respond to injury. These cells possess the unique ability to sense inflammatory environments and respond by secreting a variety of bioactive molecules, such as indoleamine 2,3-dioxygenase (IDO) and transforming growth factor-beta (TGF-beta), which suppress overactive immune responses [Nature Reviews Rheumatology, 2018]. Beyond immunosuppression, stromal cells facilitate tissue repair by producing angiogenic factors and anti-apoptotic signals that support the survival and regeneration of damaged parenchymal cells [Nature Immunology, 2014]. This mechanism is currently being harnessed in regenerative medicine and for treating autoimmune disorders, with several cell-based therapies like Remestemcel-L targeting inflammatory conditions such as graft-versus-host disease [The Lancet, 2020]. However, because this term describes a broad biological mechanism involving multiple pathways and cell types rather than a single protein or receptor, it is not classified as a conventional molecular drug target. Understanding the interplay between stromal cells and the host immune system remains a central focus for developing more effective and standardized cellular therapies.

Other names

Mesenchymal stromal cell immunomodulationMSC-mediated repairStromal cell signalingMesenchymal stem cell-mediated immunosuppression

Stromal cells modulate the immune environment through the secretion of soluble factors (e.g., IDO, PGE2, TGF-beta) and direct cell-to-cell contact with immune cells like T-cells and macrophages, shifting them from a pro-inflammatory to an anti-inflammatory phenotype while promoting endogenous tissue repair mechanisms.