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Senolytics – Compounds Targeting Cell Aging

Senolytics are compounds that selectively eliminate senescent cells from the body, helping to slow down aging and reduce the burden of age-related diseases.

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Things worth knowing about "Senolytics"

Senolytics are compounds that selectively eliminate senescent cells from the body, helping to slow down aging and reduce the burden of age-related diseases.

What are Senolytics?

Senolytics are a class of compounds specifically designed to eliminate senescent cells from the body. Senescent cells are cells that have permanently stopped dividing but do not undergo normal programmed cell death (apoptosis). Instead, they persist in tissues and secrete pro-inflammatory signals – a process known as the SASP (Senescence-Associated Secretory Phenotype). This chronic low-grade inflammation is considered a key driver of biological aging and many age-related diseases.

Mechanism of Action

Senescent cells develop specific survival mechanisms that allow them to evade normal cell death. Senolytics selectively target these mechanisms:

Inhibition of anti-apoptotic proteins: Senescent cells overexpress proteins such as BCL-2, BCL-XL, and PI3K/AKT, which protect them from cell death. Senolytics block these proteins, triggering apoptosis (programmed cell death).
Reactivation of death receptor pathways: Some senolytics restore signaling pathways that are normally suppressed in senescent cells, leading to their elimination.
Selective action: Because healthy cells express these survival proteins at lower levels, senolytics ideally act selectively on senescent cells while sparing healthy tissue.

Known Senolytics and Their Active Compounds

Quercetin and Dasatinib

Quercetin is a naturally occurring flavonoid found in many fruits and vegetables. In combination with the cancer drug Dasatinib (a tyrosine kinase inhibitor), it has demonstrated strong senolytic activity in preclinical and early clinical studies. This combination is currently one of the most extensively studied senolytic approaches.

Fisetin

Fisetin is another flavonoid found in strawberries, apples, and other fruits. Studies show that fisetin effectively clears senescent cells and reduces pro-inflammatory markers in vitro and in animal models.

Navitoclax (ABT-263)

Navitoclax is a synthetic compound that inhibits BCL-2 and BCL-XL proteins. It shows strong senolytic activity but also causes side effects such as a reduction in platelets (thrombocytopenia), which currently limits its clinical use.

Other Compounds

Additional potential senolytics are under investigation, including piperlongumine, 17-DMAG (an HSP90 inhibitor), and certain cardiac glycosides such as ouabain.

Potential Applications

The removal of senescent cells may offer therapeutic benefits in a wide range of age-related and chronic conditions:

Aging processes: Slowing biological aging and improving overall health in older adults
Osteoarthritis: Reducing senescent cells in joint cartilage to slow cartilage degradation
Cardiovascular disease: Decreasing chronic vascular inflammation
Chronic lung conditions: For example, idiopathic pulmonary fibrosis (IPF)
Type 2 diabetes: Improving insulin sensitivity by reducing metabolic inflammation
Neurodegenerative diseases: Potential slowing of Alzheimer's and Parkinson's disease progression

Current State of Research

Most of the evidence on senolytics currently comes from animal studies (particularly in mice), where impressive results have been observed: extended lifespan, improved physical function, and reduced disease burden. Clinical trials in humans are mostly still in early phases (Phase I and II). Initial human results, such as with the Dasatinib and Quercetin combination in idiopathic pulmonary fibrosis, are promising, but larger-scale trials are still needed.

Safety and Side Effects

As research into senolytics is still relatively new, the full safety profile has not yet been fully established. Potential risks include:

Unintended effects on healthy cells or tissues
Thrombocytopenia (low platelet count) with certain agents such as Navitoclax
Unknown long-term consequences of repeated use
Interactions with other medications

Self-medication with senolytics is currently strongly discouraged. Use should only occur within the framework of clinical trials or under medical supervision.

References

Kirkland JL, Tchkonia T. Senolytic drugs: from discovery to translation. Journal of Internal Medicine. 2020;288(5):518–536. DOI: 10.1111/joim.13141
Zhu Y et al. The Achilles heel of senescent cells: from transcriptome to senolytic drugs. Aging Cell. 2015;14(4):644–658. DOI: 10.1111/acel.12344
Justice JN et al. Senolytics in idiopathic pulmonary fibrosis: Results from a first-in-human, open-label, pilot study. EBioMedicine. 2019;40:554–563. DOI: 10.1016/j.ebiom.2018.12.052

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