| Feature | Adult Stem Cells (ASCs) | Mesenchymal Stem Cells (MSCs) |
| Definition | Stem cells found in various adult tissues capable of self-renewal and differentiation to maintain and repair tissue. | A subset of adult stem cells primarily found in the bone marrow, adipose tissue, and other sites, that differentiate into mesodermal lineages. |
| Source | Found in many tissues: bone marrow, brain, liver, skin, muscle, adipose, etc. | Mainly isolated from bone marrow, adipose tissue, umbilical cord, dental pulp, etc. |
| Differentiation potential | Multipotent or sometimes unipotent depending on origin; usually lineage-restricted to tissue of origin | Multipotent: can differentiate into osteoblasts, chondrocytes, adipocytes, and other mesodermal cell types. |
| Cell surface markers | Varies by tissue source; no universal marker set | Typically positive for CD73, CD90, CD105; negative for hematopoietic markers like CD34, CD45 |
| Functions | Maintain tissue homeostasis, regeneration of specific tissue types | Tissue repair, immunomodulation, secretion of trophic factors, support hematopoiesis |
| Immunomodulatory
properties | Generally limited or tissue-dependent | Strong immunomodulatory and anti-inflammatory effects |
| Translational applications | Tissue-specific regenerative therapies; sometimes limited by availability and expansion | Widely used in regenerative medicine and clinical trials for autoimmune, inflammatory diseases, and tissue repair |
| Isolation and expansion | Isolation protocols vary; some hard to isolate and expand | Relatively easier to isolate and expand in vitro under standard culture conditions |
| Ethical concerns | Minimal ethical issues as derived from adult tissues | Minimal, similar to adult stem cells |
