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Combined inhibition of class 1-PI3K-alpha and delta isoforms causes senolysis by inducing p21 WAF1/CIP1 proteasomal degradation in senescent cells.
- Source :
-
Cell death & disease [Cell Death Dis] 2024 May 29; Vol. 15 (5), pp. 373. Date of Electronic Publication: 2024 May 29. - Publication Year :
- 2024
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Abstract
- The targeted elimination of radio- or chemotherapy-induced senescent cells by so-called senolytic substances represents a promising approach to reduce tumor relapse as well as therapeutic side effects such as fibrosis. We screened an in-house library of 178 substances derived from marine sponges, endophytic fungi, and higher plants, and determined their senolytic activities towards DNA damage-induced senescent HCT116 colon carcinoma cells. The Pan-PI3K-inhibitor wortmannin and its clinical derivative, PX-866, were identified to act as senolytics. PX-866 potently induced apoptotic cell death in senescent HCT116, MCF-7 mammary carcinoma, and A549 lung carcinoma cells, independently of whether senescence was induced by ionizing radiation or by chemotherapeutics, but not in proliferating cells. Other Pan-PI3K inhibitors, such as the FDA-approved drug BAY80-6946 (Copanlisib, Aliqopa®), also efficiently and specifically eliminated senescent cells. Interestingly, only the simultaneous inhibition of both PI3K class I alpha (with BYL-719 (Alpelisib, Piqray®)) and delta (with CAL-101 (Idelalisib, Zydelig®)) isoforms was sufficient to induce senolysis, whereas single application of these inhibitors had no effect. On the molecular level, inhibition of PI3Ks resulted in an increased proteasomal degradation of the CDK inhibitor p21 <superscript>WAF1/CIP1</superscript> in all tumor cell lines analyzed. This led to a timely induction of apoptosis in senescent tumor cells. Taken together, the senolytic properties of PI3K-inhibitors reveal a novel dimension of these promising compounds, which holds particular potential when employed alongside DNA damaging agents in combination tumor therapies.<br /> (© 2024. The Author(s).)
- Subjects :
- Humans
HCT116 Cells
Proteasome Endopeptidase Complex metabolism
Apoptosis drug effects
Phosphoinositide-3 Kinase Inhibitors pharmacology
MCF-7 Cells
Proteolysis drug effects
A549 Cells
Wortmannin pharmacology
Senotherapeutics pharmacology
Class I Phosphatidylinositol 3-Kinases metabolism
Class I Phosphatidylinositol 3-Kinases antagonists & inhibitors
Class I Phosphatidylinositol 3-Kinases genetics
DNA Damage drug effects
Pyrimidines
Quinazolines
Cellular Senescence drug effects
Cyclin-Dependent Kinase Inhibitor p21 metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 2041-4889
- Volume :
- 15
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Cell death & disease
- Publication Type :
- Academic Journal
- Accession number :
- 38811535
- Full Text :
- https://doi.org/10.1038/s41419-024-06755-x