Low oxygen preconditioning of umbilical cord MSCs: from biological to mechanistic innovation

Umbilical cord-derived mesenchymal stem cells (UC-MSCs) represent a highly promising resource for regenerative medicine due to their potent immunomodulatory and proliferative capabilities, low immunogenicity, and ease of non-invasive collection. However, the low-oxygen (hypoxic) conditions these cells naturally experience are not adequately reproduced in standard in vitro culture systems. This review explores the impact of hypoxic preconditioning on UC-MSCs, with a particular focus on how reduced oxygen levels influence their biological traits and enhance their therapeutic potential. It also covers various methods for inducing hypoxia in vitro, including hypoxic chambers, chemical mimetics, three-dimensional culture systems, and also discusses physiological oxygen gradients and molecular pathways, notably hypoxia-inducible factors (HIFs). Evidence shows that hypoxic preconditioning improves UC-MSCs’ differentiation capacity, anti-inflammatory functions, survival, and resilience to oxidative stress. Collectively, these findings support the incorporation of hypoxic preconditioning into UC-MSC manufacturing and processing protocols to maximize their therapeutic efficacy and translational potential in regenerative medicine and cell-based therapies.