RT Journal Article T1 Biodistribution of Mesenchymal Stromal Cells after Administration in Animal Models and Humans: A Systematic Review. A1 Sanchez-Diaz, Manuel A1 Quiñones-Vico, Maria I A1 Sanabria de la Torre, Raquel A1 Montero-Vílchez, Trinidad A1 Sierra-Sánchez, Alvaro A1 Molina-Leyva, Alejandro A1 Arias-Santiago, Salvador K1 biodistribution K1 cell therapy K1 mesenchymal stromal cell AB Mesenchymal Stromal Cells (MSCs) are of great interest in cellular therapy. Different routes of administration of MSCs have been described both in pre-clinical and clinical reports. Knowledge about the fate of the administered cells is critical for developing MSC-based therapies. The aim of this review is to describe how MSCs are distributed after injection, using different administration routes in animal models and humans. A literature search was performed in order to consider how MSCs distribute after intravenous, intraarterial, intramuscular, intraarticular and intralesional injection into both animal models and humans. Studies addressing the biodistribution of MSCs in "in vivo" animal models and humans were included. After the search, 109 articles were included in the review. Intravenous administration of MSCs is widely used; it leads to an initial accumulation of cells in the lungs with later redistribution to the liver, spleen and kidneys. Intraarterial infusion bypasses the lungs, so MSCs distribute widely throughout the rest of the body. Intramuscular, intraarticular and intradermal administration lack systemic biodistribution. Injection into various specific organs is also described. Biodistribution of MSCs in animal models and humans appears to be similar and depends on the route of administration. More studies with standardized protocols of MSC administration could be useful in order to make results homogeneous and more comparable. SN 2077-0383 YR 2021 FD 2021-06-29 LK https://hdl.handle.net/10668/26445 UL https://hdl.handle.net/10668/26445 LA en DS RISalud RD Apr 6, 2025