Mitochondria in Aging, II: Remedies

The once-popular mitochondrial free radical theory of aging proved to be too glib. Aging isn’t fundamentally about dispersed damage; rather, dispersed damage is a result when the body’s defenses stand down in old age.  Nevertheless, the mitochondria do play a role in aging, largely through signaling and apoptosis.  Antioxidants targeted to mitochondria may be an exception to the rule that antioxidants don’t prolong lifespan.  And other supplements and strategies that either promote production of new mitochondria or enhance their efficiency of operation show promise for modest lifespan extension.


Growing new mitochondria

A ketogenic diet leads to generation of new mitochondria, as do caloric restriction and exercise.  Exercise when the body is starved for sugar (low glycogen) is the most potent stimulator of new mitochondrial growth.  Exercise while fasting, or continue to exercise after you “hit your wall”.

Hormones that promote mitochondrial proliferation include thyroxin, estrogens, and glucocorticoids.  Promoting new mitochondria has a tendency simultaneously to suppress apoptosis, programmed cell death [ref].  At later ages, apoptosis of cells that are still functional tends to be a larger problem than the failure of cancerous cells to eliminate themselves by apoptosis.  In other words, suppressing apoptosis is (on balance) a good thing for anti-aging, but the downside is it can also increase risk of cancer.

 

Ubiquinone=CoQ10

Coenzyme Q-10 (aka ubiquinone) is an essential part of mitochondrial chemistry, shuttling electrons along their way to the ATP molecules that mitochondria generate as their primary energy export to the cell.  It’s often called an antioxidant, but that’s not the primary role of CoQ10.

As a supplement, it is well-established with a good reputation.  There is lots of evidence for benefits to health markers, especially athletic endurance, several aspects of heart health, and erectile dysfunction.  If you have fibromyalgia or if you are taking statins, CoQ10 is strongly indicated.  For chronic fatigue syndrome, it’s definitely worth trying.  

But there’s no reason to expect it will increase your life expectancy.  Supplementing with ubiquinone increases the lifespan of worms but not mice or rats [ref, ref].

Worms that cannot make unbiquinone live 10 times as long.  Just saying…

A few years ago, ubiquinol was introduced as a more bioavailable form of ubiquinone.  It’s more expensive, but there is not clear evidence that it is more bioavailable.

 

PQQ

Pyrroloquinoline quinone is helpful but not necessary part of mitochondrial chemistry.  Bacteria make a lot of it; plants less; mammals only tiny quantities.  Mice completely deprived of PQQ show growth deficiency, but the amount that they need is tiny compared to the quantities in PQQ supplements.

PQQ is a growth factor for bacteria, and the principal health claim for PQQ is that it can stimulate growth of new mitochondria.  The evidence is based on biochemistry and cell cultures.  In live mice, it has been shown that PQQ deficiency results in a mitochondria deficiency, but not that large quantities of PQQ lead to more mitochondria.

Bill Faloon (LEF) and Joseph Cohen (selfhacked) are big fans of PQQ, and you can read a list of benefits here.  Cohen claims PQQ helps with sleep quality and nerve growth, leading to better cognitive function.  

Small quantities of PQQ can be absorbed from many plant foods, but not animal foods.  Much larger quantities come in supplement form. 100 g of tofu has just 2µg (micrograms).  Supplements are usually 5-20 mg, hundreds of times as much as you’re likely to get from a vegetarian diet.  Here is a table of PQQ concentrations in foods:

 

SkQ and MitoQ

These are two closely related molecules, originally synthesized in Russia in the 1970s, but it wasn’t until the 1990s that their therapeutic value was documented by two New Zealand scientists.  One end of the molecule is CoQ10 (or a version found in plants, claimed to be even more powerful as an antioxidant).  The other end of the molecule is an electric tugboat that pulls the molecule into mitochondria.  

I’ve written a  detailed report three years ago.  At the time, I noted that the Russians claimed to extend lifespan of mice modestly with SkQ, and SkQ was found (also in Russian labs) to be a powerful rejuvenant for aging eyes.  The Russians sell SkQ as eye drops.  The Kiwis sell MitoQ as skin cream and also as pills.

Earlier this year, the Russian labs announced that SkQ had substantially extended lifespan of a mouse strain that was short-lived because of a mitochondrial defect.  None of the Russian claims have been reproduced in Western labs.  Three years ago, I was inclined to give the Russians the benefit of the doubt, but now I’m starting to wonder, since the New Zealand company has a laboratory arm, and they haven’t announced anything nearly so impressive.

 

Humanin and her sisters

Mitochondria have ringlets of their own DNA, encoding just 37 genes.  (That doesn’t mean that the mitochondria only need 37 proteins; the great majority of proteins needed by mitochondria are coded in chromosomes of the cell nucleus, and transported to the mitochondria as needed.)  Just 16 years ago, the first mitochondrial-coded protein to be discovered was named Humanin, because it was found to improve cognitive function to dementia patients, restoring some of their “humanity”.  In addition to being neuroprotective, humanin promotes insulin sensitivity.  Humannin’s action is not confined to the mitochondrion in which it was produced, but in fact it  circulates in the blood as a signal molecule.  Blood levels of humanin decline with age.

Humanin

In experiments with mice, humanin injections have been shown to protect against disease.  Lifespan assays with humanin are not yet available.

To date, HN and its analogs have been demonstrated to play a role in multiple diseases including type 2 diabetes (25, 43), cardiovascular disease (CVD) (2, 3, 47), memory loss (48), amyotrophic lateral sclerosis (ALS) (49), stroke (50), and inflammation (22, 51). The mechanisms that are common to many of these age-related diseases are oxidative stress (52) and mitochondrial dysfunction (53). Mitochondria are major source of ROS, excess of which can cause oxidative damage of cellular lipids, proteins, and DNA. The accumulation of oxidative damage will result in decline of mitochondrial function, which in turn leads to enhanced ROS production (53). This vicious cycle can play a role in cellular damage, apoptosis, and cellular senescence – contributing to aging and age-related diseases. Indeed, oxidative stress is tightly linked to multiple human diseases such as Parkinson’s disease (PD) (54), AD (55), atherosclerosis (56), heart failure (57), myocardial infarction (58), chronic inflammation (59), kidney disease (60), stroke (61), cancers (62, 63), and many types of metabolic disorders (64, 65). We and others have shown that HN plays critical roles in reducing oxidative stress (6668). [2014 review]

Pinchas Cohen, MD (Dean, School of Gerontology, University of Southern California Davis, Los Angeles, California) is an expert in humanin, a protein (peptide) produced in mitochondria. Mitochondria are energy-generating organelles in cells, which have their own DNA separate from the DNA in the nucleus. The amount of DNA found in the mitochondria is much less than that found in the nucleus. As such, mitochondrial DNA contains codes for only a few proteins, humanin being one of them. Humanin was discovered by a search for factors helping to keep neurons alive in undiseased portions of the brains of Alzheimer’s disease patients. Humanin protects neurons against cell death in Alzheimer’s disease, as well as protecting against toxic chemicals and prions (toxic proteins)[ref].  Dr. Cohen’s team has shown that humanin also protects cells lining blood vessel walls, preventing atherosclerosis. In particular, they have shown that low levels of humanin in the bloodstream are associated with endothelial dysfunction of the coronary arteries (arteries of the heart).[ref] Humanin has also been shown to promote insulin sensitivity, the responsiveness of tissues to insulin. Because humanin levels decline with age, it is believed that reduced humanin contributes to the development of aging-associated diseases, including Alzheimer’s disease and type II diabetes. [Ben Best]

Personal notes: This lab near where I am visiting in Beijing is taking leadership in characterizing a group of short peptides similar in origin to humanin, and this company across the street from us is selling mitochondrial peptides.

If humanin were a patentable drug, there would be much excitement and multiple clinical trials for AD, probably leading to expansion into general anti-aging effects.

 

MOTS-c

This is another short peptide of mitochondrial origin, only recently discovered and characterized.  I was alerted to its existence by a study from a USC lab that was written up here in ScienceBlog just this month (reprinted from a USC press release).  Results are new but impressive.  Mice injected with MOTS-c had more muscle mass, less fat, more strength and endurance.  MOTS-c protected their insulin sensitivity when mice were fed a high fat diet [ref].  Lifespan studies haven’t been done yet.

Like humanin, MOTS-c is manufactured inside mitochondria from a template in mitochondrial DNA, but it is exported from the cell and appears in the bloodstream as a signal molecule.  Blood levels of MOTS-c decline with age.  It is a mini protein molecule with 16 amino acids, too big to survive digestion so it can’t be taken orally.  

MOTS-c holds much potential as a target to treat metabolic syndromes by regulating muscle and fat physiology, and perhaps even extend our healthy lifespan.”[ref]

Let’s keep your eyes on this one over the next year or two.

 

Gutathione / NAC

I’ve never heard anyone say a bad word about glutathione.  It’s the antioxidant with no downside.  Genetic modifications that upregulate glutathione have increased lifespan in worms, flies and mice.  

For a long while, it has been assumed that you can’t eat glutathione, because it doesn’t survive digestion.  Some researchers at Penn State disagree, finding impressive increases in tissue and blood levels when people were supplemented with up to 1 g per day raw glutathione.  Liposomal glutathione is an oral delivery form that gets around the digestion problem, especially when taken with methyl donors like SAMe.

The herb Sylimarin=milk thistle may increase glutathione.  For now, the precursor molecule N-Acetyl Cysteine (NAC) is the best-established supplement we have to promote glutathione.  In the one available study, supplementing with NAC greatly increased lifespan in male but not female mice.  NAC also increases lifespan in worms and flies.

N-Acetyl Cysteine

Glutathione

 

For the future, we might hope to do better.  Less than 20% of the cell’s glutathione actually makes its way to the mitochondria, where it is most needed.  There are esters of glutathione that, in theory, ought to be attracted into the mitochondria.  They have been tested in cell culture only, but are more than ripe for animal testing [ref].

 

Nicotinamide Riboside (NR) and other NAD+ enhancers

The chemicals NAD+ and NADH are alternative, cycled forms of an intermediate in the process by which mitochondria make energy.  Levels of NAD+/NADH decline with age.  NR is a precursor to NAD+, and it has been demonstrated (preliminary results in humans) that NR supplementation increases blood levels of NAD+.

It may be awhile before we know for sure whether this leads to better health or longer lifespan.  Niagen and Basis are heavily promoted with credible scientifists behind their products, and many early adopters offer subjective reports of short-term benefits.  There is one mouse study claiming to pull a 3% extension of lifespan out of the noise, and perhaps I am less open to the finding because the article, published prominently in Science, seems so breathless in describing benefits.

 

Melatonin

The primary role of melatonin is to regulate the body’s sleep/wake cycle.  Melatonin declines with age and the timing of our daily melatonin surge gets fuzzier and less reliable with age.sleep quality deteriorates.  Sleep quality suffers.

Melatonin is well-established in mice as a modest longevity aid, although results have been inconsistent.  12 out of 20 studies showed a lifespan increase, and the remaining 8 showed no increase or decrease.  Whether nightly supplementation affects mortality rates in humans has never been determined.

Melatonin is concentrated in mitochondria as much as 100-fold, and it may even be created there [ref], independent of the circulating melatonin that is secreted from the pineal gland at night.  One of its actions is as a mitochondrial antioxidant and scavenger of ROS.

Twenty years ago, Walter Pierpaoli promoted melatonin as a sleep aid, cancer fighting hormone that would enhance your mood and your sex life while keeping you young.  Russian labs have also been optimistic.  My take is that melatonin is a legitimate anti-aging hormone, and is especially useful for those of us whose sleep is disrupted with age.  It is widely available, cheap and safe.  Unless you’re fighting jet lag, 1 to 2 mg at night is all you need.

Also worth mentioning

Magnesium is required for manufacture of glutathione.  Selenium works along with glutathione.  Omega-3 fatty acids can promote synthesis of glutathione.  Acetyl L-carnitine transports fat fuels through the mitochondrial membrane.  Alpha-lipoic acid is part of the mitochondrial energy metabolism.

The Bottom Line

Commercial interests can make some messages louder than others, and the health news we hear is affected by what is profitable as much as by what is healthy.  Exercise is primary, but has no sales value.  Of the supplements reviewed here, NAC is the best-established for mitochondrial health and a possible effect on lifespan.  It is cheap and available.  Liposomal glutathione is certainly more expensive and possibly more effective.  Melatonin is even cheaper, and has been found to increase lifespan in multiple rodent studies, with broad benefits apart from modification of mitochondrial function.  Humanin and MOTS-c, not yet close to commercial availability, seem to be promising substances to explore for health, though not for profits.

55 thoughts on “Mitochondria in Aging, II: Remedies

  1. Regarding this quote:
    ‘Like humanin, MOTS-c is manufactured inside mitochondria from a template in mitochondrial DNA, but it is exported from the cell and appears in the bloodstream as a signal molecule. ‘

    Is it true that its translation obligatorily occurs in the cytoplasm via
    the standard genetic code because
    translation using the mitochondria-specific genetic
    code would yield tandem start and stop codons?

    • The PhysOrg link suggests that MOTS-c is sometimes made inside the mitochondrial ribosome and sometimes out in the cell’s ribosomes, and that the two structures are significantly different. – different lengths, for example. This is more detail than I care to get into.

      • I wrote the article in the PhysOrg and still have no idea exactly what is going on, but think we should certainly figure it out. The authors of the original paper aparently have a company formed to spin off this MOTS-c, but said that mitochondria must export it to the cytoplasm because the codon right after the start codon is a termination codon. However, if you fast forward to the bleeding edge reported in WiKi, it says the following, now we know at this level of detail at least;

        ‘AGA and AGG were thought to have become mitochondrial stop codons early in vertebrate evolution.[1] However, at least in humans it has now been shown that AGA and AGG sequences are not recognized as termination codons. A -1 mitoribosome frameshift occurs at the AGA and AGG codons predicted to terminate the CO1 and ND6 open reading frames (ORFs), and consequently both ORFs terminate in the standard UAG codon.[2]

        https://en.wikipedia.org/wiki/Vertebrate_mitochondrial_code

    • NAC plays an insignificant role. The article was not pointed out that a large effect on the recovery of mitochondria has modern substances used to depopulation. It is not enough just to stimulate mitochondria, but it is also necessary to avoid inhibitors. The most widespread substances used for depopulation are rapeseed oil, fish oil omega 3, vitamin D3 and Cd2+.

        • Even if you take 6 grams a day, the effect will be hard to notice. By contrast, when you stop eating unsaturated omega 3 oils, rapeseed oil and vitamin D3, it will have a 2 times greater effect on you than everything you did earlier. Eat only completely saturated fats (butter fat, tallow) and no fish. Rumors about the benefits of omega 3 and vitamin D3 are designed to relieve the planet from old people and reduce the cost of pensions.

          • Rapeseed oil has toxins in it. The raw seed is processed by being heated, crushed, squeezed, filtered and then cleaned up with caustic soda to remove improve it’s appearance. After that is coloured and bottled.

            This industrial process is why it’s called an”Industrial Oil” As an oil it is also high in Omega 6.

            And like all industiai oils, consuming it reduces male fertility. Documented here:

            http://roguehealthandfitness.com/vegetable-oils-promote-male-infertility/

            Umm, All in all, Not such a great idea

          • Great. These rape oil toxins are polyunsaturated fatty acids called omega 6 and omega 3. In 1961, Denham Harman discovered their ability to initiate and propagate aging of mitochondria.

          • Immediately after this discovery, billions of people loved omega 3 to shorten painlessly their lives and did not oxidize “on this world” for too long.

          • Omasta, your advice is at best ignorant, at worst dangerous. I can only speak for myself, but I had a dangerously low vitamin D level. Constantly infections, tired all the time, low libido and the list goes on and on… After one year of vitamin D3 supplementation and level once again was within “normal” range, Symptioms gradually dissapeared.

          • To OLE – I just have other information than you. Mega doses of vitamin D3 over 2000 IU, for example 5000 IU / day, trigger programmed cell death by increasing the cytoplasmic concentration of Ca2+ ions. You have had psychosomatic trouble and the improvement was just a placebo effect, or you did not take mega doses..

          • Mr ‘No Mista’, you are wrong and you are trolling.
            I have taken high dose VD3 in combination with K2 for the past 4 years with no ill effects.

            And Jeff Bowles has done the same and docoumented it in his book ” The Miraculous Results of Extremely High Doses of VD3″ USA 2014.

        • Josh I think Mr Omasta is a misinforming troll. Why he would want to do this I do not know. But he is posting here comments contrary to what research has discovered.. And not using a real name either..

          maybe blocking or deleting is appropriate ?

          • Denham Harman was the father of the Free Radical Theory of Aging. A theory, which has largely been discarded. Welcome to the 21. century, Omasta.

          • I read the publication from Harman, it had 900 pages. So far, no one questioned. It is taught at chemistry faculties. Give 6 mg of methylene blue to breathe the news.

    • I’ve taking during several years 3x600mg of NAC per day to manage my high homocysteine. No issues that I’m aware of so far.

  2. Hi Josh,

    Thanks for the excellent and balanced review of anti-oxidants that operate on the mitocondria. I have taken many of these compounds, CoQ10, NAC, melatonin, acytle-carnitine, carnosine, lipoic acid, NR, most for 30 years now and continue to take them while other compounds I have dropped. I have recently started taking methylene blue, (6 mg a day), starting slowly, and have found it to be resulting in multiple positive changes in my skin.

    I would like to here more about your perspective on methylene blue when you get a chance to get around to it, as it has a anti-oxidant behavior but it also participates in the electron transport chain at cytochrome oxidase step and it effects NO metabolism as well. Other than vitamin A analogs, this is the only compound that I have heard about that significantly reverses human skin aging in tissue culture?

    • Hi Kevin,

      I am so glad you posted this. I was also wondering about Josh’s perspective on methylene blue. About a 2 months ago I decided to try it out as well but at a smaller oral dose. Between .5 and 1 mg a day. I also decided to use it in lotion. I seem to be experiencing extremely positive results but I am always a bit weary that my personal experiences may be skewed. That being said… unless it’s dumb luck or some kind of temporary fluke, I can’t think of anything else that could be responsible for the changes I have seen. Only time will tell… Here is an interesting article you might like.

      https://www.nature.com/articles/s41598-017-02419-3

      • Sounds encouraging Kevin. Where do you buy MB? I have been unable to find any commercial skin care products containing MB. Thanks!

        • One can purchase high purity MB from chemical supply companies, but it is not USP grade. This one of the reasons that I take such a small dose, 6 mg total per day. 2 mg 3 times a day diluted in water.

          This is just what I do, I am not suggesting that anyone else do this, I am some what of a risk taker.

      • Hi Joe,

        Yes, I have read the article as well, that is what initially prompted me to investigate methylene blue. It is interesting how the research article ranks it relative to other antioxidants.

        Other research has pointed out that it has been prescribed to people at 0.5 mg to 2 mg per Kg body weight. That would be a daily dose of more than 40 mg per day for me. I have decided to to be much more conservative with dosing at this time.

  3. In most recent Blagosklonny paper, “From rapalogs to anti-aging formula” Oncotarget 2017 (open access), Blagosklonny includes Melatonin. As I would rate Blagosklonny as head and shoulders plus chest, abdomen and hips above everybody else in anti-aging field, this is excellent support for Josh’s comment on Melatonin.
    Alan Green, M.D.

    • Alan,

      as for Blagosklonny’s work. I took 2mg per day of Condasertan during two weeks but I finally gave up because my pressure went too low. The issue with this is that I have normally low pressure.

      Is there any other Angiotensin II inhibitor that can be taken in such a low dosage that does not decrease much the pressure and is still enough to be effective?.

      Thanks.

        • Thanks Alan,
          then, I’ll forget about the angiotensin II blockers for now.

          Please, I have another question for you. I’ve being reading your site and checking prices of Rapamycin. Seemingly, Everolimus is much more expensive than Sirolimus (especially the Indians brands). Aside from the obvious peace of mind that gives a high-quality pharma, Sirolimus generic pose any concern?.

          Best,
          Santiago

  4. I took NAC for a while 3 x 500 mg per day for a while until it gave me an ulcer. It reduces protective mucous production in the GI tract. I now take sub- lingual glutathione occasionally such as after alcohol consumption. Question to Josh and group: if antioxidants do not extend lifespan or even shorten it due to the interruption of repair signaling, why should NAC or glutathione be different?

    • Hi Neil,

      I have taken NAC 600 mg daily for 25 plus years, there is evidence that it does increase health-span, but I know of no studies that shows that NAC extends maximum life-span in larger mammals.

      This is consistent with the concept of a clock controlling aging, probably hypothalamic in nature that Josh has talked about. This is also consistent with the role of the accumulation of senescent cells over time.

      • In recent paper, “From rapalogs to anti-aging formula”, 2017, Blagosklonny provided the criteria for what is an anti-aging drug:
        “1. A drug that prolongs life span in model organism preferably in mammals.
        2. A drug that prevents or delays several age-related diseases in mammals.
        3. A drug that suppresses cellular geroconversion from quiescence to senescence.”
        Rapamycin fulfills all 3 criteria. If your drug doesn’t fulfill all 3 criteria or at least 2 out of 3; it is not an anti-aging drug.
        Alan Green, M.D.

  5. @Josh,

    as usual, great work. On a side note, I’ve found quite amusing the article you mentioned on GSH. I’ve read in so many places that it is no effective orally, that it must me expensive liposomal or IV, even with deep considerations with pathways and so. Biology is like physics, at the end of the day the only valid knowledge is the experimental.

  6. More on Melatonin: Reference by Josh is really excellent. 2016 paper. Blagosklonny in 2017 paper had 4 references about Melatonin, most recent 2013 and not nearly as informative as reference given by Josh also Josh has link.
    Melatonin produced by mitochondria for their protection. Melatonin also produced by Pineal gland which produces melatonin as primary function. This suggests that melatonin supplements might get to mitochondria as mitochondria seem to rely on their own mitochondria plus “supplements” from Pineal gland. If entire function of Pineal gland is to make melatonin and melatonin also made be mitochondria, then Melatonin could be important for mitochondrial health.
    Excellent work by Josh.

  7. Thanks for mentioning CoQ10, given the wide variety of benefits! It’s been studied for heart failure, Parkinson’s, mitochondrial disease, and fertility. Statin users can also benefit from CoQ10 since statins lower CoQ10 levels.

    While ubiquinol may or may not be more bioavailable (deepening on the individual), research shows CoQ10 supplements that are both water and fat-soluble are better absorbed by the body than regular CoQ10: https://www.ncbi.nlm.nih.gov/pubmed/?term=Plasma+coenzyme+Q10+response+to+oral+ingestion+of+coenzyme+Q10+formulation

  8. You referenced the work of several Russian scientists; I am reminded of they also identified the peptide – Epitalon – which acts on the Pineal gland and produces melatonin. Have you developed any opinions about the use of Epitalon for melatonin production.
    I as disappointed that the Russian work has not been investigated by Western scientists; is this just “not invented here” syndrone.

    • Josh I posted a comment about this just published research on the impact of these snps on aging yesterday. But my comment has disappeared. So too has the link I provided to the New Scientist article on the same subject.

      Both gone ? That’s very odd.

      However as these miRNA’s circulate in the blood surely they are the aging signals you discussed last year in a post here. Or rather the lack of miRNA’s in the blood are the aging program signal

  9. Having searched a while and found the New Scientist article again, I will post a copy here in case it disappears again. Your post on how the blood of young mice had a mysterious ‘youthing’ effect on old mice is hereby explained.

    Stem cells in the brain’s hypothalamus help mice stay young
    By Jessica Hamzelou

    YOUR brain may be to blame for your ageing body. A small cluster of stem cells in the brain seems to help mice stay young, and injecting extra stem cells helps them live longer. One day anti-ageing drugs might be able to replicate the effect in people.

    Ageing is a complicated process, involving DNA damage, chronic inflammation, and worn-out cells, but we don’t yet know which of these has the biggest impact on ageing. Dongsheng Cai at the Albert Einstein College of Medicine in New York has been investigating the role of the brain in ageing, since it controls most of our bodily functions.

    His team previously found that the hypothalamus, which releases hormones that affect other organs, seems to affect how mice age. By interfering with a molecular pathway in the hypothalamus, the team extended the lifespan of mice by 20 per cent.

    Cai’s team wondered whether stem cells here might influence ageing. Although stem cells in the hypothalamus create new neurons throughout life, the team noticed that mice start losing them in middle age – about 10 or 11 months old. By the time mice are 2 years old – around 70 in human years – the cells are basically all gone, says Cai.

    Mice age faster if these stem cells are destroyed. “There was a decline in learning and memory, coordination, muscle mass, endurance and skin thickness,” says Cai. The mice died a few months earlier than untreated animals.

    But injecting the hypothalamus with extra stem cells, taken from the brains of newborn mice, slowed down this premature ageing, and gave mice an extra two to four months of life (Nature, DOI: 10.1038/nature23282).

    First the team had to modify the stem cells so that they kick-started an anti-inflammatory pathway in the mice, otherwise the cells died and the injections didn’t work. This suggests that it may be inflammation that usually causes the death of stem cells in the brain as we age.

    The team found that the injected stem cells secreted a particularly large amount of microRNAs. These are small molecules that can affect the way genes work, and the types of microRNA in our blood are known to vary according to age. Cai isn’t sure how the stem cell microRNAs might be working, but they seem to reduce biological stress and inflammation, he says.

    Cai thinks his team’s findings could one day lead to a treatment for ageing. Once the microRNAs have been identified, it might be possible to develop drugs that mimic their effects, he says.

    This may have the potential to become a therapy in about 30 years, says Richard Faragher at the University of Brighton, UK, who says other teams are already working towards microRNA drug treatments. An alternative strategy would be to target inflammation more generally. “I can see us taking multiple approaches,” says Faragher.

    This article appeared in print under the headline “Stem cell boost slows down ageing”

  10. The way I view aging is the same way I view the universe of Infectious disease; a very large number of different diseases, malaria, tuberculosis, bubonic plague, HIV, etc.
    We are now beginning to understand different diseases that make up aging. Elevated TOR driven diseases seems to be most important among the common age-related diseases and conditions in the 60-95 age group and the one cause can now effectively treat. However, mitochondrial diseases discussed in this section by Josh also seem very important.
    This report on stem cells related to hypothalamus can be another age-related disease. The nature of disease described in this paper appears to be that stem cells from hypothalamus make a substance that circulates in CSF and promotes nerve cell health and this declines with age and loss of this substance produced by stems cells promotes certain changes associated with aging. If true, it is another newly discovered aging disease, which joins a growing list. However, as in the world of Infectious disease, each new infectious disease just adds to the list, it doesn’t erase other diseases or become the Master of Infection.
    Alan Green, M.D.

  11. There is no doubt mitochondria function less well with age – the question is why: Is it some in-built mechanism inherent to mitos themselves, or is it something regulated by the cell?

    My money is on the second option. There’s just no reason for these organelles to age outside of an external signal.

    They are still a valid intervention point, but if I am correct healthy mitos will translate into a healthier, more vital person – just like being fit, but will not translate to longer life.

  12. Insulin sensitivity tends to decline with age. Perhaps this might be one way to combat this decline?
    http://www.medscape.com/viewarticle/841119_4
    Intranasal Insulin Enhanced Resting-state Functional Connectivity of Hippocampal Regions in Type 2 Diabetes
    Discussion

    This study demonstrated that in diabetic and age-matched healthy subjects, intranasal administration of a single dose of insulin acutely increased resting-state functional connectivity between the hippocampal regions and multiple regions within the DMN (i.e., MFC, IPC, ACC, and PCC) that are linked to integrative higher cognitive functions. After placebo administration, connectivity between hippocampal regions and these DMN regions was lower in diabetic subjects as compared with healthy control subjects in several brain regions. After insulin administration, the cluster size differences between the diabetes and the control groups decreased by 44% in the MFC and by 95% in the ACC. After administration of intranasal insulin, the differences in functional connectivity between the diabetes and control groups were no longer significant.
    These findings suggest that acute administration of insulin via intranasal delivery route may improve functional connections between brain regions involved in memory and cognitive processing in other domains.
    The insulin resistance syndrome is associated with reduced brain insulin levels and sensitivity in age-related memory impairment and AD.[5,27–29] Brain insulin plays an important role as a neuromodulator in cognition,[4,5] energy homeostasis, food intake, sympathetic activity, neuron-astrocyte signaling, synapse formation, and neuronal survival.[7,30] Insulin has been shown to reinforce signaling in the dopamine-mediated brain reward system and modulate food intake and responses to reward stimuli.[31–33] Intranasal insulin increases rapidly in cerebrospinal fluid and binds to insulin receptors[34,35] in the olfactory bulb, several regions in the cerebral cortex including the autonomic network (e.g., insular cortex, dorsal root ganglia, nigro-striatal neurons), cerebellum,[36–38] hypothalamus, and hippocampus.[34,35,39]
    T2DM is associated with impairment of hippocampus-dependent memory, and these effects are proportional to diabetes severity.[2] Resting-state functional connectivity is also altered in T2DM subjects, and the severity of impairment correlates with the degree of insulin resistance.[18,19] The effects of intranasal insulin on resting-state connectivity have not been studied. Diabetic subjects had worse baseline cognitive performance, especially in the memory and executive function domains. We have previously shown, in this cohort, that intranasal insulin may acutely improve visuospatial memory in older diabetic and healthy adults, and that this improvement of memory and verbal learning may be dependent upon vasodilation response in the middle cerebral artery territory and in particular insular cortex.[10] In diabetic subjects on insulin, better performance on the verbal fluency naming task was associated with stronger coefficient of connectivity between the right hippocampal region and ACC and lesser connectivity between the left hippocampal regions and the MFC for a more difficult category switching task. In control subjects on insulin, better performance on the visuospatial memory task (BVMT-R) tended to correlate with stronger connectivity between the left hippocampal region and PCC. Differences in relationships between cognition and connectivity between the right and left hippocampal regions are intriguing and reflect a complexity of the large-scale verbal fluency network that comprises of verbal fluency and orthographic discrimination subnetworks.[40] Set switching is a complex operation involving a number of different brain structures that usually include various parts of the dorsolateral and dorsomedial prefrontal cortex, as well as temporal regions where hippocampus is located.[41] Functional integration within the verbal fluency network declines with age and task difficulty. Low productive-difficult tasks are associated with significant decreases in connectivity. Therefore, the decreased connectivity between the left hippocampus and DMN regions may reflect inhibition of the left hippocampus as a result of the complex category switching process.[42] After placebo administration, we have observed a “deactivation pattern”[15,16] that is characterized by task-related decreases in activity and connectivity among several DMN regions. In other words, during a task, a better task-related performance is associated with a decrease in functional connectivity within DMN.

    • Thanks Mark.
      This looks like one fantastic paper you posted which will need a very lot of study. I divide aging into early aging (65-90, the mTOR driven diseases) and late aging, the real inexorable killer. Mitochondria seems at the the center of late aging (what you called maximal lifespan) and this paper seems to zero in on what is going bad with mitochondria. While early aging is now well understood and can be controlled, late aging (what Blagosklonny called post aging syndrome) is one complete mystery.

        • Mitochondria are destroyed by ROS (which Denham Harman discovered in 1961) and no one will change it. The primary sector where this knowledge was used was food industry. Shortly after the discovery, “aging accelerating foods by ROS” began to be promoted.
          I estimate that “accelerating aging” foods are able to reduce life by 20% on average. These foods “eats” about 50% of the population. Can you imagine how much less is spent on pensions when the average life span is reduced by 10%? Even a car dealer can not afford to spend so much on advertising.

          By excluding these substances from your diet, you will prolong your life more than using methylene blue, rapamycin, and metformin altogether.

      • This paper is very supportive of TOR driven aging (classed here as metabolic rate) and the stability of mitochondrial DNA being the two largest factors on the difference in lifespans between mammals. Together they account for almost 80% of the variation!

        https://www.ncbi.nlm.nih.gov/pubmed/18442324

        If we believe what this paper is saying, and although I’m no statistics expert I believe we should, then we have to look to these two main drivers of aging before anything else.

        • For me, this paper posted by Mark is most important paper I have seen in 2017 and gives me very different view of mitochondria. Previously I had seen loss of mitochondria as just loss of a vital structure. Now I see mitochondria as potential 2 micron potential Chernobles. Through the mitochondrial permeability transition pore mitochondria can damage rest of cell setting off a downward spiral resulting in cell death.
          Previously has seen this phenomenon in Parkinson’s disease in which failure to have proper housekeeping and quality control as regards mitochondria leads to loss of mitochondria and death of neurons; but in Parkinson’s disease limited to neurons in substantia nigra.
          Looks like through mitochondrial permeability transition pore the process of cell damage from failing mitochondria can be a generalized phenomenon when have failure to timely remove defective mitochondria by normal process of mitophagy.

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