【What Is Rejection: The Immune System's Defensive Instinct to Protect the Self】
Rejection refers to the process by which the body's immune system identifies a transplanted organ or cells from another individual as "foreign"—an enemy—and mounts an attack to eliminate it.
The human body is equipped with a mechanism that rigorously distinguishes "self" from "non-self" in order to defend against viruses and bacteria.
In transplant medicine, even when foreign cells are introduced with the benevolent intent of treating disease, immune cells such as T cells will identify them as "intruders" if they do not originate from the patient's own body, and will launch a full-scale attack.
While this response demonstrates that the immune system is functioning correctly, it represents the single greatest barrier to overcome in transplant-based treatment.
【HLA Compatibility and the Risk of GVHD (Graft-versus-Host Disease)】
The key determinant of rejection is a protein found on the surface of cells known as HLA (Human Leukocyte Antigen).
This protein functions much like a cellular "ID card," and unless this type matches, the immune system will initiate an attack.
A particular point of caution in the fields of regenerative medicine and biohacking concerns the risks associated with using another individual's stem cells (allogeneic transplantation).
Introducing incompatible cells not only triggers rejection but can also lead to a serious complication known as GVHD (Graft-versus-Host Disease), in which the transplanted, otherwise healthy cells instead identify the patient's own body as foreign and attack it.
Preventing this may require patients to remain on powerful immunosuppressant medication for life in some cases, a factor that can significantly diminish quality of life (QOL).
【Our Clinic's "Zero Immune Risk" Strategy】
At Tokyo Capital Clinic, our governing principle in managing the health of our executive clientele is to impose absolutely no unnecessary risk.
For this reason, we do not, as a matter of policy, provide treatments that use cells from another individual.
The primary reason our clinic centers its approach on autologous transplantation (treatment using the patient's own cells) and on treatments built around stem cell culture supernatant (exosomes), which contain no cellular material at all, is precisely to avoid this risk of rejection.
When using a patient's own cells, the ID card—HLA—matches with 100% certainty, meaning no immune attack can occur.
We define the most efficient and safest form of biohacking as one that spares the body any unnecessary "battle," allowing its energy to be devoted entirely to regeneration and repair.
