QUADRI-positive stromal cell (QPSC) population for superior cell protection and immunomodulation

The invention unexpectedly found that an isolated and modified QPSC population has multi-potentiality, including: osteoblasts (bone cells), chondrocytes (cartilage cells), and adipocytes (fat cells). The QPSC population of the invention features a desirable immunomodulation ability, including inducing, enhancing, or suppressing an immune response and thus has potential value in the prevention and/or treatment of various immune diseases/disorders/conditions. The invention has effective homing ability and regulation ability in complement-dependent cytotoxicity, including the ability to block the activation of host complements and direct migration to the target area and the ability to enhance cell viability, and thus offers better cell protection and therapeutic efficacy in vivo in the prevention and/or treatment of various acute tissue injury, ischemic or degenerative diseases/disorders/conditions.