Re: [GRG] Dasatinib + Quercetin gerotrial?…

Hi Howard,

Quercetin is not associated with PPH, to the best of my knowledge. Rather, it’s dasatanib, which is a prescription drug used primarily in the treatment of cancer. Dasatnib is an oral oral Brc Abl tyrosine kinase inhibitor. It was U.S. FDA approved in 2006, however because of its high cost, there is not a lot of experience with it.

I don’t know if dasatanib+quercetin will be effective in humans at doses that are “safe”, or even if reducing the burden of senescent cells will extend lifespan. However, as you point out, it is likely that reducing the number of senescent cells will improve the health-span. Moreover, if this combo works topically, or as an oral-topical combination then it may substantially rejuvenate the skin. Senescent and hyperplasia cells in skin are a major cause of skin aging.  I suppose I should patent this idea, because whoever develops AND successfully markets the first truly effective skin anti-aging cream/nostrum is going to be richer than Bill and Melinda Gates, LOL! Photodamaged cells form large colonies of both senescent and actinic (hyperplastic) cells. A recently developed UV photography technique shows just how bad, how early, and how nearly invisible this pathology is:

There are several treatments to eliminate the actinic fraction of these photodamaged areas, most notably the cytotoxic chemotherapeutic agent  5-fluorouracil, administered as a 5% cream. The 5-FU causes inflammatory necrosis of the actinic cells, as can be seen in the photos below:

This red, raw inflammatory response starts after a few days of application. The recommended duration of treatment is 3-4 weeks and the redness persists for a couple of weeks following the cessation of Tx. Once Tx is complete, the risk of skin cancer is greatly reduced, most of the hyperpigmented, freckled, liver-spotted areas are gone, and the skin generally looks much younger. However, you have to go around looking like the people in the photos above for onto two months: to say, many patients simply refuse to have this Tx! [As a relevant aside, age spots or liver spots are NOT due to lipofuscin containing cells, nor are they remediated by centrophenoxine.]

There is another Tx for actinic keratosis which does not cause this inflammatory response, imiquimod, which is a topical medication that up-regulates a variety of cytokines that provoke a nonspecific immune response (interferons, natural killer cells) and a specific immune response (T cells). It is applied 2-3 times a week for up to 4 months, although generally one month of Tx is sufficient, with the notable downside being that it costs about $800 for a course of treatment. 

If you look at the photos above, it makes you wonder what the interior of our aging/aged bodies look like with respect to senescent cells. It should also give pause to the systemic application of dasatinib+quercetin without first evaluating the effect of inducing apoptotic death in a significant fraction of the body’s cells locally. This is in part why I suggest a cutaneous trial, first. 

Since I discovered the ability of imiquimod to selectively destroy actinic cells in the skin, I’ve thought about the possibility of finding a way to do the same thing with senescent cells systemically. Dasatinib+quercetin may be the answer. Even if it can only be used topically, that may prove advantageous from a cosmetic standpoint – which is no small thing.

Mike Darwin 



About Johnny Adams

My full-time commitment is to slow and ultimately reverse age related functional decline to increase healthy years of life. I’ve been active in this area since the 1970s, steadily building skills and accomplishments. I have a good basic understanding of the science of aging, and have many skills that complement those of scientists so they can focus on science to advance our shared mission. Broad experience Top skills: administration, management, information technology (data and programming), communications, writing, marketing, market research and analysis, public speaking, forging ethical win-win outcomes among stakeholders (i.e. high level "selling"). Knowledge in grant writing, fundraising, finance. Like most skilled professionals, I’m best described as a guy who defines an end point, then figures out how to get there. I enjoy the conception, design, execution and successful completion of a grand plan. Executive Director Gerontology Research Group (GRG). Manages Email discussion forum, web site, meetings and oversees supercentenarian (oldest humans, 110+ years) research. CEO / Executive Director Carl I. Bourhenne Medical Research Foundation (Aging Intervention Foundation), an IRS approved 501(c)(3) nonprofit. Early contributor to Supercentenarian Research Foundation. Co-Founder Geroscience Healthspan Forum. Active contributor to numerous initiatives to increase healthy years of life. Co-authored book on conventional, practical methods available today to slow the processes of aging – nutrition, exercise, behavior modification and motivation, stress reduction, proper supplementation, damage caused by improper programs, risk reduction and others. Fundamental understanding of, and experience in the genomics of longevity (internship analyzing and curating longevity gene papers). Biological and technical includes information technology, software development and computer programming, bioinformatics and protein informatics, online education, training programs, regulatory, clinical trials software, medical devices (CAT scanners and related), hospital electrical equipment testing program. Interpersonal skills – good communication, honest, well liked, works well in teams or alone. Real world experience collaborating in interdisciplinary teams in fast paced organizations. Uses technology to advance our shared mission. Education: MBA 1985 University of Southern California -- Deans List, Albert Quon Community Service Award (for volunteering with the American Longevity Association and helping an elderly lady every other week), George S. May Scholarship, CA State Fellowship. BA psychology, psychobiology emphasis 1983 California State University Fullerton Physiological courses as well as core courses (developmental, abnormal etc). UCLA Psychobiology 1978, one brief but fast moving and fulfilling quarter. Main interest was the electrochemical basis of consciousness. Also seminars at the NeuroPsychiatric Institute. Other: Ongoing conferences, meetings and continuing education. Aging, computer software and information technology. Some molecular biology, biotech, bio and protein informatics, computer aided drug design, clinical medical devices, electronics, HIPAA, fundraising through the Assoc. of Fundraising Professionals. Previous careers include: Marketing Increasing skill set and successes in virtually all phases, with valuable experience in locating people and companies with the greatest need and interest in a product or service, and sitting across the table with decision makers and working out agreements favorable to all. Information Technology: Management, data analysis and programming in commercial and clinical trials systems, and bioinformatics and protein informatics. As IT Director at Newport Beach, CA based technology organization Success Family of Continuing Education Companies, provided online software solutions for insurance and financial professionals in small to Fortune 500 size companies. We were successful with lean team organization (the slower moving competition was unable to create similar software systems). Medical devices: At Omnimedical in Paramount CA developed and managed quality assurance dept. and training depts. for engineers, physicians and technicians. Designed hospital equipment testing program for hospital services division. In my early 20’s I was a musician, and studied psychology and music. Interned with the intention of becoming a music therapist. These experiences helped develop valuable skills used today to advance our shared mission of creating aging solutions.
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