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Senolytic

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A senolytic (from the words senescence and -lytic, "destroying") is among a class of small molecules under basic research to determine if they can selectively induce death of senescent cells and improve health in humans.[1] A goal of this research is to discover or develop agents to delay, prevent, alleviate, or reverse age-related diseases.[2][3] A related concept is "senostatic", which means to suppress senescence.[4]

Research

Possible senolytic agents are under preliminary research, including some which are in early-stage human trials.[5][6][clarification needed] The majority of candidate senolytic compounds are repurposed anti-cancer molecules, such as the chemotherapeutic drug dasatinib and the experimental small molecule navitoclax.[7][8]

Soluble urokinase plasminogen activator surface receptor have been found to be highly expressed on senescent cells, leading researchers to use chimeric antigen receptor T cells to eliminate senescent cells in mice.[9][10]

According to reviews, it is thought that senolytics can be administered intermittently while being as effective as continuous administration. This could be an advantage of senolytic drugs and decrease adverse effects, for instance circumventing potential off-target effects.[5][11][12][13]

Recently, artificial intelligence has been used to discover new senolytics, resulting in the identification of structurally distinct senolytic compounds with more favorable medicinal chemistry properties than previous senolytic candidates.[14][15]

Senolytic candidates

Hypothetical candidates for senolytics based on early-stage research
Medication/target Description Tests as senolytic have been conducted in ...
human cell lines in vitro mice models xenograft model phase I trial phase II trial phase III trial
FOXO4-related peptides[12][16][11][5] FOXO4 binding to p53 protein retains it in the nucleus, which prevents it from interacting with mitochondria in the cytosol where it would activate caspases, leading to apoptosis (programmed cell death).[17] Instead, retention of p53 in the nucleus by FOXO4 promotes cellular senescence.[17] A peptide that binds with FOXO4 disrupts the p53-FOXO4 interaction, releasing p53 into the cytosol and triggering cell death.[17] Yes[17] Yes[17]
BCL-2 inhibitors Inhibitors of different members of the bcl-2 family of anti-apoptotic proteins.[12][18][19] Studies of cell cultures of senescent human umbilical vein endothelial cells have shown that both fisetin and quercetin induce apoptosis by inhibition of the anti-apoptotic protein Bcl-xL (a bcl-2 family member).[5] Yes[5]
Src inhibitors Src tyrosine kinase inhibitors: dasatinib[20] – see "Combination of dasatinib and quercetin" below
USP7 inhibitors Inhibitors of USP7 (ubiquitin-specific processing protease 7)[16] Yes[21] Yes[21]
Dasatinib and Quercetin (D+Q) Combination of dasatinib and quercetin[19][18][13][12] Yes Yes Yes[22][23]
Fisetin[12][18][11][5] Yes[24] Yes[24]
Navitoclax[12][5] xenograft Yes[25]
SSK1 Senescence-specific killing compound 1: A gemcitabine (a cytotoxic chemotherapeutic) prodrug that is activated by lysosomal β-galactosidase (a common senescence marker)[26] Yes[26]
BIRC5 knockout Crispr/Cas9 BIRC5 Gene Knockout. Crispr/Cas9 is used to trigger apoptosis in relation to a specified gene sequence such as a cancer gene sequence or damage marker sequences.[27] Yes[27]
GLS1 inhibitors Target the enzyme kidney-type glutaminase 1 (GLS1). Senescent cells have a low pH due to their high lysosomal content and leaking lysosomal membranes. This low pH forms the basis of senescence-associated beta-galactosidase (SA-β-gal) staining of senescent cells. To help neutralize their low pH, senescent cells produce high levels of GLS1; inhibiting the activity of this enzyme exposes senescent cells to unsurvivably severe internal acidity, leading to cell death.[28] Yes[28]
Anti-GPNMB vaccine Glycoprotein nonmetastatic melanoma protein B (GPNMB). A protein that enrich senescent cells studied as molecular target for a senolytic vaccine in mice.[29] Yes[29]
Cardiac glycosides[12][11] Yes[30][31][32] xenograft Yes[31]
25-hydroxycholesterol (25HC)[33] 25-hydroxycholesterol targets CRYAB in multiple human and mouse cell types Yes[33] Yes[33]
Procyanidin C1 Yes[34] Yes[34]
EF-24[18][11] Yes
HSP90 inhibitors[35]
CUDC-907[36]

Senomorphics

Senolytics eliminate senescent cells whereas senomorphics – with candidates such as Apigenin, Rapamycin and rapalog Everolimus – modulate properties of senescent cells without eliminating them, suppressing phenotypes of senescence, including the SASP.[12][11]

See also

References

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  2. ^ Kirkland JL, Tchkonia T (August 2015). "Clinical strategies and animal models for developing senolytic agents". Experimental Gerontology. 68: 19–25. doi:10.1016/j.exger.2014.10.012. PMC 4412760. PMID 25446976.
  3. ^ van Deursen JM (May 2019). "Senolytic therapies for healthy longevity". Science. 364 (6441): 636–637. Bibcode:2019Sci...364..636V. doi:10.1126/science.aaw1299. PMC 6816502. PMID 31097655.
  4. ^ Hu, Qinchao; Peng, Jianmin; Jiang, Laibo; Li, Wuguo; Su, Qiao; Zhang, Jiayu; Li, Huan; Song, Ming; Cheng, Bin; Xia, Juan; Wu, Tong (28 October 2020). "Metformin as a senostatic drug enhances the anticancer efficacy of CDK4/6 inhibitor in head and neck squamous cell carcinoma". Cell Death & Disease. 11 (10): 925. doi:10.1038/s41419-020-03126-0. PMC 7595194. PMID 33116117.
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  19. ^ a b Hernandez-Segura A, Nehme J, Demaria M (June 2018). "Hallmarks of Cellular Senescence" (PDF). Trends in Cell Biology. 28 (6): 436–453. doi:10.1016/j.tcb.2018.02.001. PMID 29477613. S2CID 3534989.
  20. ^ Rivera-Torres J, San José E (2019). "Src Tyrosine Kinase Inhibitors: New Perspectives on Their Immune, Antiviral, and Senotherapeutic Potential". Frontiers in Pharmacology. 10: 1011. doi:10.3389/fphar.2019.01011. PMC 6759511. PMID 31619990.
  21. ^ a b He Y, Li W, Lv D, Zhang X, Zhang X, Ortiz YT, et al. (March 2020). "Inhibition of USP7 activity selectively eliminates senescent cells in part via restoration of p53 activity". Aging Cell. 19 (3): e13117. doi:10.1111/acel.13117. PMC 7059172. PMID 32064756.
  22. ^ Hickson LJ, Langhi Prata LG, Bobart SA, Evans TK, Giorgadze N, Hashmi SK, et al. (September 2019). "Senolytics decrease senescent cells in humans: Preliminary report from a clinical trial of Dasatinib plus Quercetin in individuals with diabetic kidney disease". eBioMedicine. 47: 446–456. doi:10.1016/j.ebiom.2019.08.069. PMC 6796530. PMID 31542391.
  23. ^ Justice JN, Nambiar AM, Tchkonia T, LeBrasseur NK, Pascual R, Hashmi SK, et al. (February 2019). "Senolytics in idiopathic pulmonary fibrosis: Results from a first-in-human, open-label, pilot study". eBioMedicine. 40: 554–563. doi:10.1016/j.ebiom.2018.12.052. PMC 6412088. PMID 30616998.
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Further reading

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