# Senescent Cells: How 'Zombie Cells' Age Your Skin, and Do Senolytics Work? > Senescent cells stop dividing but keep releasing inflammatory signals that age skin. What the research shows, early senolytic trials, and what you can do today. Canonical: https://antiagingcare.org/blog/senescent-cells-zombie-cells-aging HTML version: https://antiagingcare.org/blog/senescent-cells-zombie-cells-aging Author: Anti Aging Care Editorial Team Published: 2025-03-20 Category: Science Senescent cells are cells that have permanently stopped dividing but don't die. They are nicknamed "zombie cells" because they linger and release a mix of inflammatory and tissue-damaging signals. The short answer: senescent cells build up in skin with age and sun exposure and are a real driver of skin aging in research. Clearing them extended healthy lifespan in mice, and early human trials of senolytic drugs show they can reduce senescent cells. There is still no proven senolytic treatment for skin aging in people, and senolytic drugs should only be used in clinical trials. ## The short answer - Senescence is triggered by DNA damage, UV, oxidative stress and short telomeres. It protects against cancer in the short term, but accumulating senescent cells cause harm ([Franco et al., *Trends Mol Med*, 2022](https://pubmed.ncbi.nlm.nih.gov/35012887/)). - Senescent cells release the "SASP" (senescence-associated secretory phenotype): inflammatory cytokines and enzymes that break down collagen ([Lee et al., *Int J Mol Sci*, 2021](https://pubmed.ncbi.nlm.nih.gov/33917737/)). - In mice, removing p16-positive senescent cells delayed age-related disorders ([Baker et al., *Nature*, 2011](https://pubmed.ncbi.nlm.nih.gov/22048312/)). - In a small human pilot study (9 people with diabetic kidney disease), dasatinib plus quercetin reduced senescent cells in fat and skin tissue ([Hickson et al., *EBioMedicine*, 2019](https://pubmed.ncbi.nlm.nih.gov/31542391/)). This was not a skin-aging study. ## How senescent cells age skin | Effect | Visible result | |---|---| | Collagen-degrading enzymes | Wrinkles, thinning | | Inflammatory signals | Redness, slower healing | | Fewer dividing cells | Slower renewal, dullness | In skin, senescent fibroblasts in the dermis are especially important because fibroblasts make collagen. Researchers think senescent skin cells may even contribute to aging elsewhere in the body ([Franco et al., 2022](https://pubmed.ncbi.nlm.nih.gov/35012887/)). Senescence is also a key driver of [inflammaging](/blog/inflammaging-chronic-inflammation). ## Senolytics and senomorphics: where the science is - **Senolytics** kill senescent cells. The best-known combination is dasatinib (a cancer drug) plus quercetin (a plant flavonoid); fisetin is also being studied. Human trials are small and focused on diseases, not skin. - **Senomorphics** calm the SASP without killing cells. Rapamycin is one example; see [rapamycin, longevity and skin](/blog/rapamycin-longevity-skin-aging). - **Topical "senolytic" skincare** uses ingredients that reduced senescence markers in lab studies. A 2021 review summarizes polyphenols with this activity in the lab ([Csekes & Račková, *Int J Mol Sci*, 2021](https://pubmed.ncbi.nlm.nih.gov/34884444/)). Robust human skin trials are lacking. Don't take dasatinib or other prescription drugs for anti-aging outside a clinical trial. They have real side effects. ## What you can do now 1. **Prevent new senescence with sunscreen.** UV damage is a leading trigger in skin. See our [sunscreen anti-aging guide](/blog/sunscreen-anti-aging-guide). 2. **Use a retinoid.** Retinoids stimulate collagen and improve photoaged skin, partly countering what senescent fibroblasts do ([Quan, *Biomolecules*, 2023](https://pubmed.ncbi.nlm.nih.gov/38002296/)). Start with [retinol vs retinoid](/blog/retinol-vs-retinoid). 3. **Don't smoke, exercise, and sleep well.** These reduce oxidative stress and inflammation. 4. **Read the longevity basics:** [mitochondrial dysfunction and skin aging](/blog/mitochondrial-dysfunction-skin-aging) and [epigenetic clocks](/blog/epigenetic-clocks-biological-age). ## Frequently asked questions ### Are senescent cells bad? Not always. Senescence helps stop damaged cells from becoming cancerous and plays a role in wound healing. Problems arise when they accumulate and aren't cleared. ### Can supplements like quercetin or fisetin remove senescent cells? In people, that hasn't been shown for skin aging. Human senolytic studies used specific doses under medical supervision, and quercetin was paired with a prescription drug. ### Do senolytic skincare products work? Some ingredients reduce senescence markers in lab cells. There is little human trial evidence that these products visibly reduce wrinkles. ### What causes cells to become senescent? DNA damage from UV and oxidative stress, shortened telomeres, cancer-causing gene changes and some chemotherapy drugs. ## Bottom line Senescent cells are a genuine driver of skin aging, and senolytics are one of the most exciting areas of aging research, but they aren't ready for routine anti-aging use. Prevent damage with sunscreen, rebuild collagen with a retinoid, and talk to your doctor before trying any "senolytic" supplement or drug. _This article is for educational purposes only and is not medical advice. Talk to your doctor or dermatologist about your situation._ ## Sources - [Franco AC, et al. Skin senescence: mechanisms and impact on whole-body aging. Trends Mol Med. 2022.](https://pubmed.ncbi.nlm.nih.gov/35012887/) - [Lee YI, et al. Cellular Senescence and Inflammaging in the Skin Microenvironment. Int J Mol Sci. 2021.](https://pubmed.ncbi.nlm.nih.gov/33917737/) - [Baker DJ, et al. Clearance of p16Ink4a-positive senescent cells delays ageing-associated disorders. Nature. 2011.](https://pubmed.ncbi.nlm.nih.gov/22048312/) - [Hickson LJ, et al. Senolytics decrease senescent cells in humans: preliminary report from a clinical trial of dasatinib plus quercetin. EBioMedicine. 2019.](https://pubmed.ncbi.nlm.nih.gov/31542391/) - [Csekes E, Račková L. Skin Aging, Cellular Senescence and Natural Polyphenols. Int J Mol Sci. 2021.](https://pubmed.ncbi.nlm.nih.gov/34884444/) - [Quan T. Human Skin Aging and the Anti-Aging Properties of Retinol. Biomolecules. 2023.](https://pubmed.ncbi.nlm.nih.gov/38002296/)