Do senolytics already work in humans, or only in mice so far?
Senolytics no longer work only in mice: there is now first concrete evidence in humans, but the studies are small and lack long-term outcomes, so they cannot yet be relied upon as a proven treatment.
Senolytics do not only work in mice: small but concrete steps have now been taken in humans. The best-known combination is dasatinib plus quercetin. In a pilot study with 9 patients with diabetic kidney disease, a course of just 3 days was enough to produce a measurable reduction in senescent cells in fat tissue and skin. Within 11 days, inflammatory markers in the blood also fell detectably. This is the first direct evidence that senolytics actually remove senescent cells in humans, but 9 patients without a control group is too few to say whether this also leads to long-term health benefits.
In cancer treatment, the results are somewhat further along. In 51 patients with head and neck cancer, a combination of senolytics with immunotherapy achieved a major pathological response in one third of participants, with few serious side effects (grade 3 or 4 in only 4.2%). A proof-of-concept study in prostate cancer also showed clinical benefit in a subset of patients through a related approach: inhibiting the inflammation caused by senescent cells. These are promising early results, but randomised comparative trials are still lacking.
For other conditions, such as osteoarthritis and fertility problems caused by ageing of the endometrium, the evidence in humans is still almost non-existent. In osteoarthritis the mechanism is biologically plausible based on animal research, but clinical results are not yet available. In the endometrium the situation is additionally complicated: senescent cells also play a normal role there in embryo implantation, which makes developing safe senolytics for this organ particularly difficult.
Review articles emphasise that mouse studies are compelling, but that the translation to humans is still at an early stage. Results in mice do not automatically reproduce in humans, and questions about the right timing, dosage and long-term safety remain unanswered.
Sources include one open-label pilot study (N=9, PMID 31542391), one phase 2 trial in cancer (N=51, PMID 40855191), one proof-of-concept study in prostate cancer (PMID 37844613), two review articles on clinical translation (PMID 32800659, 31292558), and two reviews on the specific indications of osteoarthritis (PMID 33208917) and endometrium (PMID 37468438). No randomised controlled trials with long-term outcomes are available.
Does clearing senescent cells with senolytics help against ageing?
Senolytics show impressive results in mouse studies, but in humans the evidence is too thin for use outside clinical trials. Self-medication with Dasatinib is inadvisable due to its side effects and cancer-biology risks.
What are senescent cells and why are they bad for you?
Senescent cells are damaged cells that stop dividing but continue to live and chronically inflame their surroundings. They accumulate as you age and are strongly linked to age-related diseases, but because they also play a protective role, simply clearing them all away is not an option.
What exactly does senescence do to your cells as you age?
Senescent cells stop dividing, accumulate with age and cause damage throughout the body through a constant stream of inflammatory substances. They are both a protector (a brake on cancer) and a cause of damage, and that makes targeted intervention more complex than it appears.
Do sirtuins actually do anything against ageing?
Sirtuins play a clear role in ageing in animal research, but whether they are of any benefit to humans (through supplements or other means) remains unknown. Wait for human evidence before acting on any sirtuin-based claims.
Can meditation do anything about ageing at the cellular level?
There are cautious indications that meditation favourably influences the activity of the telomere-repairing enzyme, but whether this truly keeps your cells younger has not yet been convincingly proven. Meditation for stress reduction has a considerably stronger evidence base in any case, and an indirect effect on cellular ageing via that pathway is plausible.
Does fisetin from strawberries really work as a zombie-cell cleaner?
Fisetin demonstrably clears zombie cells in lab and mouse research, but whether this also works in humans and is safe has not yet been established. Do not take it as a supplement outside clinical studies for the time being.