Senolytic treatments selectively destroy senescent cells, and several different approaches have been shown to produce some degree of rejuvenation in mice: reversal of measures of aging; reversal of the progression of specific age-related conditions; extension of life span. Most of these initial senolytics are repurposed pharmaceuticals drawn from cancer research databases, with the exceptions being the engineered peptide FOXO4-DRI, the suicide gene therapy developed by Oisin Biotechnologies, and SIWA Therapeutics’ immunotherapy. Where animal study data has been published, the results produced by these varied senolytics are remarkably similar: up to 50% clearance of senescent cells from old tissues in mice, varying widely from tissue to tissue.
One of the repurposed pharmaceuticals is dasatinib, a drug already approved by the FDA for cancer treatment, with a sizable amount of human data by which we can judge side-effects and safety. Dasatinib is a generic drug that is mass produced by numerous manufacturers worldwide, whether with or without approval from the US government, and as a consequence it costs very little. This presents an interesting challenge for those companies attempting to produce senolytic therapies, as new treatments must run through clinical trials