⏱ 4 min read
Apoptosis is programmed cell death: an orderly, regulated process by which the body eliminates damaged, aged, infected, or potentially dangerous cells without triggering inflammation, unlike accidental death (necrosis). It is a pillar of tissue homeostasis: every day billions of cells die and are replaced through this pathway, and its proper functioning is essential for development, tissue renewal, and defense against cancer.
There are two main routes. The intrinsic (mitochondrial) pathway is activated by cellular stress —DNA damage, reactive oxygen species, lack of growth factors— and depends on permeabilization of the mitochondrial membrane and the release of cytochrome c, which activates the executioner caspases. The extrinsic pathway is triggered from the outside, when ligands such as FasL or TNF bind to death receptors on the cell surface. Both converge on the activation of caspases, the enzymes that dismantle the cell in a controlled manner.
The balance of apoptosis is delicate, and its dysregulation goes in two opposite directions. When there is TOO LITTLE apoptosis, cells that should die survive: this is a hallmark of cancer, where tumor cells evade programmed death, and it also contributes to the persistence of autoreactive cells in autoimmunity and of senescent cells that accumulate with age. When there is TOO MUCH apoptosis, needed cells are lost: this is what happens with neurons in neurodegenerative diseases (Alzheimer's, Parkinson's) or after a heart attack or a stroke.
Many compounds studied in oncology and longevity act, at least in part, by pushing damaged cells toward apoptosis. Polyphenols such as curcumin, resveratrol, quercetin, EGCG from green tea, or sulforaphane from broccoli induce selective apoptosis in tumor cells in laboratory models; senolytics (such as dasatinib + quercetin, or fisetin) seek to eliminate accumulated senescent cells through apoptosis; and fasting or fasting cycles alongside chemotherapy appear to sensitize cancer cells to dying. It is worth stressing that most of this evidence is preclinical (cell cultures and animals): "inducing apoptosis in a dish" is not equivalent to a treatment in people, and in healthy tissues an excess of apoptosis would be harmful.
Apoptosis is closely related to other mechanisms on the map: the mitochondrion (where the intrinsic pathway is decided), oxidative stress, senescence, and inflammation. That is why many interventions that appear under longevity, cancer, or neurodegeneration converge, one way or another, on how and when a cell decides to die.
For educational purposes, not medical advice. The evidence on modulation of apoptosis by supplements is mostly preclinical.
Information, not medical advice.