What is an MSC (mesenchymal stem cell) and how does it work in the body?

Biologically, stem cells fall into three broad categories: embryonic stem cells, induced pluripotent stem cells, and adult stem cells. Mesenchymal stem cells (MSCs) belong to the last group. MSCs can be found at several sites in the body — bone marrow, adipose (fat) tissue, umbilical cord tissue and other connective tissue — and each source yields slightly different cell quantity and characteristics.

MSCs have three defining properties that make them medically relevant. First, self-renewal — the ability to keep dividing. Second, differentiation potential — the ability, in the lab or in the body, to become bone, cartilage or fat cells. Third, paracrine signalling — secreting growth factors and cytokines that prompt surrounding tissue to repair itself and help rebalance local inflammation.

MSCs differ from embryonic stem cells in that they cannot become every cell type in the body — they are 'multipotent', not 'pluripotent' — and they avoid the ethical sourcing questions tied to embryonic cells, since they can be collected from an adult's own bone marrow or fat. That makes them more straightforward to use clinically in many countries.

Two mechanisms are commonly cited for how MSCs act. The first is direct differentiation, where the MSC itself becomes replacement tissue. The second is the paracrine effect, where the MSC does not need to transform at all but instead acts as a signalling hub, prompting the body's own local progenitor cells to repair more effectively. Current research generally suggests the paracrine effect plays the larger role.

Cheongdam Cell Clinic states that every one of its programmes — 淸(Rejuvenation)CELL, 性(Sex)CELL, 美(Beauty)CELL, 毛(Hair)CELL and 活(Vitality)CELL — uses MSCs harvested from the patient's own bone marrow (autologous), not donor cells. This avoids the immune-rejection concerns that arise when cells come from another person.

In practice, patients considering MSC treatment should understand that cell quality depends on several factors: the patient's age, how much marrow can be harvested, and each provider's extraction technique. Because Cheongdam Cell Clinic states it does not culture or expand the cells, what is injected is the natural cell population obtained from that day's marrow harvest, not cells multiplied in a laboratory over several weeks.

The advantage of skipping the culture step is speed — the clinic states the whole process finishes within half a day — and a lower risk of contamination or cell-property drift during prolonged laboratory expansion. The trade-off is that the final cell count depends on what can be harvested in a single session, whereas culturing can theoretically yield more cells. Both approaches have trade-offs and remain a topic of ongoing academic debate.

For anyone researching stem cells before travelling to Korea for treatment, understanding basic MSC biology makes it easier to ask providers the right questions — where the cells come from, whether they are cultured, and how they are administered — all of which shape realistic expectations. The next article in this series compares bone-marrow-derived and adipose-derived stem cells in detail.