Life Extension Magazine 2018
Major Advance in Healthy Longevity: Senolytics
By Mary Benton
TIME Magazine has reported a discovery that will likely transform medical practice. Here is one quote:
“It’s looking like very old mice are able to substantially improve their health span, reduce or delay age-related diseases, and increase their survival.”1
The article describes age-reversal research performed at the Mayo Clinic and Scripps Research Institute.
The therapy targets and eliminates senescent cells, which are a factor in degenerative aging.
These findings represent a significant leap forward in reducing and even reversing aging at the cellular level.
The Los Angeles Times on July 10, 2018, reported further:
“Aging…is beginning to look more and more like a disease—and a treatable one at that.”
“...[this new study]...not only offers a clear look at the power of senescent cells to drive the aging process, but also a pharmaceutical cocktail that, in mice at least, can slow and even reverse it.”
“Compared to mice who aged normally, those that started the dasatinib-quercetin [senolytic] cocktail at an age equivalent to 75 to 90 years in humans ended up living roughly 36% longer, and with better physical function.”2
The last quote indicates that elderly people may be able to restore physical functionality and live longer by purging their bodies of senescent cells.
The quotes on the left page describing the potential to “transform medical care” were published in a recent issue of the Journal of the American Medical Association.
Senescent cells lose the ability to properly function. Instead, they linger in a sort of zombie-like state, not fully alive, but not dead.
As senescent cells accumulate they inflict systemic damage by:
1) Emitting pro-inflammatory signals and
2) Secreting protein-degrading enzymes.3
Mayo Clinic researchers tested the natural compound quercetin in combination with the drug dasatinib. The purpose was to target and eliminate these zombie-like senescent cells. This experimental “senolytic” treatment restored youthful function and improved survival.4
Fascinated by these findings, Life Extension® scientists have studied the mechanisms of dasatinib and identified intriguing natural compounds (theaflavins) that function in a similar senolytic fashion.
Quercetin and theaflavins have complementary activity, and can provide a dual-action approach to help clear senescent cells from the body to restore youthful function at the cellular level.
Deadly Impact of Zombie-like Cells
What this Mayo Clinic discovery further revealed is the degree of toxicity inflicted by senescent cells:
If only one in 7,000 to 15,000 cells are senescent, then age-related deterioration starts to occur in laboratory mice.5
To reiterate, just one senescent cell out of 7,000-15,000 healthy cells can initiate degenerative aging.
To make matters worse, senescent cells seem to pass on their age-accelerating toxicity to normal cells, creating a spiral of pathologic disorders that result in chronic illnesses and premature death.
Cell Senescence and Aging
cell burden in our tissues
may help maintain optimal
function and reduce the
risk for disease.
In our youth, cells naturally eliminate themselves if they become damaged or dysfunctional. This process, which damaged (senescent) cells “shut off,” is called apoptosis.
Apoptosis is often referred to as “programmed cell death.” This self-elimination is a normal and important part of maintaining and regenerating healthy tissues.6 As organs age, however, more cells become senescent.
These zombie-like cells emit harmful compounds that promote inflammation in the surrounding tissue.7-10 Chronic inflammation is a major contributor to degenerative disorders.11-14
Published research demonstrates that buildup of senescent cells accelerates aging processes and increases risk of age-related diseases.15-18 Diabetes, obesity, stroke, vision loss, neurogenerative disorders, osteoarthritis, emphysema, and cancer can be connected to the presence of senescent cells.9,10,17-20
The possibility of removing senescent cells from the body provides a novel approach to modulating and reducing the cellular factors of aging.4
What Are Senolytics?
Senolytic compounds can be drugs, peptides, or plant extracts that act to cleanse the body of senescent cells.8,21
In human cell and animal studies, consistent findings show that removing senescent cells from the body improves various markers of aging and prolongs lifespan in some models.4,8,20,22,23
In a 2016 study published in Science, researchers demonstrated that in a mouse model of atherosclerosis, removal of senescent cells led to significant inhibition of growth and even regression of arterial plaque.24 This ability to block or reverse plaque growth could be an important step in preventing heart and blood vessel disease.
In another study published in Nature, a mouse model of aging demonstrated that removing senescent cells benefited multiple tissues, while delaying the onset and slowing progression of age-related disorders.20
How Do Senolytics Work?
Senescent cells fail to undergo programmed self-elimination. Like a contagion, senescent cells pass on their accelerated aging properties to healthy cells by releasing a number of factors that can cause tissues to deteriorate.
Senolytic compounds target anti-apoptotic pathways. This causes senescent cells to self-destruct and be eliminated from the body.
Senolytics are able to specifically target these cells and activate their suicide switch so that they proceed to die a normal death.23 In this way, toxic cells are removed from the body without harming highly functioning cells.
Quercetin: A Plant-Based Senolytic
Quercetin, a compound found in many fruits and vegetables, has long been recognized for its health benefits.25-30 It is an anti-inflammatory agent that has been shown to protect cells and tissues from injury.26-30
In lab studies, quercetin has been demonstrated to improve markers of aging and extend lifespan.31-36 Human studies have shown quercetin reduces or prevents age-related disease and dysfunction.37,38
In addition to these general health and longevity promoting benefits, the medical literature supporting quercetin as a senolytic has been growing over the last decade.4,8,23,36,39-41
Quercetin, when combined with other compounds, can clear senescent cells from tissues. When applied directly, quercetin may enable a rejuvenating effect in healthy cells.4,36,39
Enhancing Quercetin’s Effects
A challenge in fully benefiting from quercetin is that it can have low oral bioavailability.42
To improve quercetin’s absorbability so that the body can obtain higher benefits at lower doses, researchers integrated quercetin into a phytosome.
Phytosomes combine a natural compound (like quercetin) with a plant-based phospholipid carrier.43 This enables much more quercetin to enter the bloodstream to exert its beneficial effects throughout the body.
Research led by the Mayo Clinic and Scripps Research Institute scientists used quercetin along with a chemotherapeutic drug, dasatinib, in their studies.
They demonstrated that quercetin along with dasatinib removed human senescent cells from cell cultures to a greater degree than either compound alone.4,5
When dasatinib and quercetin were administered to old mice, systemic regeneration occurred.4
Dasatinib is a drug intended to treat cancer. Yet the rejuvenation potential of properly taking dasatinib and quercetin is compelling.
This prompted Life Extension scientists to seek out a natural compound that exhibits promising senolytic-like effects and shares some of the same mechanisms of action of dasatinib.44-47 The best candidate is a group of natural compounds found in black tea called theaflavins.
Like quercetin, theaflavins have exhibited numerous health benefits, including lifespan extension.44,48-51
Most excitingly, theaflavins demonstrated senolytic-like effects in a recent animal study.44
Theaflavins are safe and are not associated with any of the side effects that can occur with dasatinib.52 The combination of quercetin and theaflavins offers a senolytic punch, without side effect concerns.
Another important finding from Mayo Clinic and Scripps Research Institute is that intermittent dosing of the combination of the senolytics quercetin and dasatinib improved grip strength, coat condition, movement, and overall health.4
This same study also revealed improvement in a biomarker of senescent cells in the kidney compared with control mice.4
These results suggest that combinations of natural senolytics such as quercetin phytosome and theaflavins may also restore youthful cellular function, even when taken on an intermittent basis.
Cell senescence is common in aged tissues.
Senescent cells cannot remove themselves from the body through normal channels. Their impairment and tendency to promote inflammation contribute to loss of physical function and the risk for age-related disease and disability.
Senolytic compounds have the ability to cleanse the body of these cells, improving organ function and preventing disease. Several compounds are being actively studied for these effects and to define their optimal role in promoting longevity.
Quercetin and theaflavins have a number of different properties that promote health and longevity, including senolytic activity. Delivery of quercetin in a phytosome and co-administering it with theaflavins may help maximize the senolytic effect.
If you have any questions on the scientific content of this article, please call a Life Extension® Wellness Specialist at 1-866-864-3027.
- Available at: http://time.com/5333752/aging-drugs/. Accessed August 6, 2018.
- Available at: http://www.latimes.com/science/sciencenow/la-sci-sn-anti-aging-cocktail-20180710-story.html. Accessed August 6, 2018.
- Campisi J, d’Adda di Fagagna F. Cellular senescence: when bad things happen to good cells. Nat Rev Mol Cell Biol. 2007;8(9):729-40.
- Zhu Y, Tchkonia T, Pirtskhalava T, et al. The Achilles’ heel of senescent cells: from transcriptome to senolytic drugs. Aging Cell. 2015;14(4):644-58.
- Xu M, Pirtskhalava T, Farr JN, et al. Senolytics improve physical function and increase lifespan in old age. Nat Med. 2018.
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- Coppe JP, Desprez PY, Krtolica A, et al. The senescence-associated secretory phenotype: the dark side of tumor suppression. Annu Rev Pathol. 2010;5:99-118.
- Kirkland JL, Tchkonia T. Cellular Senescence: A Translational Perspective. EBioMedicine. 2017;21:21-8.
- Tchkonia T, Zhu Y, van Deursen J, et al. Cellular senescence and the senescent secretory phenotype: therapeutic opportunities. J Clin Invest. 2013;123(3):966-72.
- Zhu Y, Armstrong JL, Tchkonia T, et al. Cellular senescence and the senescent secretory phenotype in age-related chronic diseases. Curr Opin Clin Nutr Metab Care. 2014;17(4):324-8.
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- Fuhrmann-Stroissnigg H, Ling YY, Zhao J, et al. Identification of HSP90 inhibitors as a novel class of senolytics. Nat Commun. 2017;8(1):422.
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- Baker DJ, Wijshake T, Tchkonia T, et al. Clearance of p16Ink4a-positive senescent cells delays ageing-associated disorders. Nature. 2011;479(7372):232-6.
- Malavolta M, Bracci M, Santarelli L, et al. Inducers of Senescence, Toxic Compounds, and Senolytics: The Multiple Faces of Nrf2-Activating Phytochemicals in Cancer Adjuvant Therapy. Mediators Inflamm. 2018;2018:4159013.
- Jeon OH, Kim C, Laberge RM, et al. Local clearance of senescent cells attenuates the development of post-traumatic osteoarthritis and creates a pro-regenerative environment. Nat Med. 2017;23(6):775-81.
- Kirkland JL, Tchkonia T, Zhu Y, et al. The Clinical Potential of Senolytic Drugs. J Am Geriatr Soc. 2017;65(10):2297-301.
- Childs BG, Baker DJ, Wijshake T, et al. Senescent intimal foam cells are deleterious at all stages of atherosclerosis. Science. 2016;354(6311):472-7.
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