Category Archives: Transhuman News

The search to extend lifespan is gaining ground, but can we truly reverse the biology of ageing?

This is a long read. Enjoy!

It was once a fringe topic for scientists and a pseudo-religious dream for others. But research into the biology of ageing, and consequently extending the lifespan of humans and animals, has become a serious endeavour.

Ageing research is often promoted as the key to the eternal fountain of youth, or an elixir of immortality. But the true promise of ageing research is that rather than tackling individual diseases one at a time, a single drug would treat all the diseases that arise in old age, at once.

There would be cost savings from keeping elderly patients out of specialist appointments for each condition. And a single health-maintaining pill would avoid the problem of drug overuse and interactions common in older people who have to medicate each condition individually.

The idea of extending human life makes some uneasy, as preventing death seems unnatural. Certainly, were lifespan to be drastically increased, there would be challenges in funding the old age pension, among other issues.

But this is already happening. Drugs and interventions developed over the past century that have almost doubled human lifespan could be considered as anti-ageing. Think of antibiotics, which have added anywhere between two and ten years to human life expectancy. There is no debate that they are an essential part of modern medicine.

But when we talk about an anti-ageing pill, we mean one that targets the process of ageing itself. There is already a list of such drugs shown to extend the lives of lab animals. Many of these work through mimicking the effects of a near starvation diet.

Calorie restriction

Calorie restriction has for over 80 years been the most well-studied intervention known to delay ageing.

The willpower required to maintain a near starvation diet for an entire lifetime is beyond most. But regular, short term calorie restriction (such as the 5:2 diet of eating normally for five days and reducing calorie intake for two) has strong benefits for metabolic health, which helps control obesity and diabetes.

Animal studies show a reliable extension in lifespan during intermittent fasting. Other studies have shown genetically altering the bodys ability to respond to insulin, which is released when we eat a meal, doubles lifespan in worms. A similar experiment in mice revealed a less dramatic, but a still significant, increase in lifespan of 18%.

Early on, the effectiveness of restricting calories led scientists to hunt for genes that mediated these effects. In the late 1990s and early 2000s, scientists became interested in sirtuins a class of enzymes that turn on defence mechanisms during starvation.

Drugs such as the now infamous compound resveratrol, present in red wine, can activate one member of the sirtuins, called SIRT1, to extend lifespan in mice and slow markers of ageing. The SIRT1 enzyme requires a fuel for its activity, called NAD+, the levels of which decline with old age.

Given the importance of NAD+ to SIRT1, the idea of raising NAD+ levels has attracted attention. But NAD+ is used by other cell processes that could be involved in ageing. For example, Dr. Jun Li recently showed NAD+ levels are essential to turning on DNA repair machinery, which wanes as we age. These findings could also be used to reduce DNA damage caused by radiation exposure such as in childhood cancer survivors and cosmic radiation encountered by astronauts in outer space.

The long-term effects of restricting calories on ageing in humans have yet to be fully characterised, and such a study in humans would be difficult to perform.

Further reading - Explainer: how do drugs work?

Protein restriction

It may be that the anti-ageing effect of calorie restriction isnt in overall calorie intake, but rather the intake of the protein component of diets. Researchers have measured health and lifespan in an array of diets with different ratios of protein to carbohydrate to fats. They discovered protein restriction, rather than overall calorie restriction, is more important to lifespan.

Translated to human diets, this would be the exact opposite of the paleo diet, a high protein diet which emphasises meat and unprocessed vegetables over grains. The concept behind this diet is to mimic that of early paleolithic humans living a hunter-gatherer existence. It is worth noting, however, that paleolithic humans are thought to have had a lifespan of only 33 years.

The one population with the lowest recorded levels of heart disease in the world are the Tsimane, a tribal group leading a gatherer-horticulturalist existence in the Bolivian Amazon. This group has a high carbohydrate and low protein diet.

Consistent with the idea that lowering protein intake extends lifespan, turning off the enzyme mTOR, which senses protein intake, with the drug rapamycin is the most powerful drug intervention we have so far to extend lifespan.

Rapamycin is used in the clinic to suppress the immune system during organ transplants. It extends life in a number of animal species such as worms, fruit flies, and mice, even when delivered briefly in middle age, or late in life. The downside, of course, is that one must live with a suppressed immune system, which is a bit of a drag if youre not living in a sterile lab environment.

The Bolivian Tsimane have a high carbohydrate and low protein diet. Photo RNW.org/Flickr, CC BY

In addition to simulating protein restriction, mTOR inhibition with rapamycin also promotes a process called autophagy. This is where the cell essentially eats itself, breaking down and destroying the old and damaged parts of the cell into its raw materials, which can be recycled into new structures. A compound called spermidine, discovered in semen and present in trace quantities in cheese, has been found to extend lifespan in mice by 10%. Its thought this is due to spermidines ability to turn on autophagy.

Out with the old

Another anti-ageing strategy is one called senolysis: that is, killing off old and damaged or senescent cells. These cells take up space, grow larger, and release substances that cause inflammation. When mice are genetically engineered so that it is possible to kill off senescent cells, health is drastically improved and animals live 20 to 30% longer.

The hunt is now on for senolytic drugs, which can selectively kill off senescent cells. One company, Unity Biotech, recently raised US$116 million to achieve this.

DNA changes

There is strong evidence that ageing is literally part of our DNA. So-called jumping genes are DNA parasites, caused by ancient viral infections in our evolutionary ancestors, and they make up almost half of our genetic material. These genes can actually cut and paste themselves so that they jump around to a different part of our DNA, and in doing so make our genomes less stable.

These genes are normally turned off by another sirtuin enzyme called SIRT6, and animals genetically engineered to have an extra copy of this gene live longer and in better health.

Our DNA changes as we get older. For example, structures that cap the ends of our chromosomes (which carry our genes) called telomeres shorten with old age or stress. Lengthening telomeres has been suggested as a way to restore youth. The trouble is the gene that does this, called telomerase, is normally only turned on in adults who have cancer.

Genetically engineered animals that over-produce telomerase from birth develop cancer. But to add confusion, using genetically engineered viruses to force old mice to make more telomerase results in a longer lifespan with improved late-life health, without an increased risk of cancer.

Elizabeth Parrish, who is the CEO of Bioviva a company working to develop anti-ageing treatments recently travelled to Colombia to receive gene therapy to extend her telomeres.

Another drastic way to reverse ageing might be to turn adult cells back into youthful stem cells, which is possible by turning on so-called Yamanaka factors. These work through turning certain genes on or off. The problem is that turning Yamanaka factors on too much again causes cancer. Instead, turning these genes on briefly appears to reverse ageing and extend lifespan in short-lived mice. This could be a powerful but risky strategy for reversing ageing.

Is it already here?

In the end, the first ever anti-ageing drug likely to reach the market will be one were already familiar with: metformin. Its used to treat diabetes, has been around since the 1950s and is used by tens of millions of people.

In animals, metformin extends lifespan and maintains health, while population-wide studies show it reduces cancer risk. Metformin is thought to work by turning on an energy sensor in cells called AMPK, which senses situations of low energy and alters metabolism in response.

The effect of metformin on health and lifespan in older, non-diabetic individuals is currently the subject of the TAME trial in New York. If successful, this trial may lead to the first ever gero-protective or anti-ageing pill, which would be taken as a widely-used prophylactic by the older population.

The TAME trial is being watched keenly by the drug industry. Ageing is not yet recognised as an actual disease by regulatory authorities, which makes potential therapies that treat ageing less commercially viable.

Any such drug will instead be targeted towards specific diseases of ageing, for example, arthritis or type 2 diabetes.

Regardless of whether any of the drugs above are eventually shown to be safe and effective in humans, the current advice for maintaining health in old age is predictable but effective. Exercise, a varied and moderate diet, maintaining social contact, and avoiding stress have profound health benefits, beyond anything that will ever be available in a pill.

For anyone wishing to hear more about this research, the upcoming Australian Biology of Ageing Conference on 27-28th April 2017 will feature a public lecture.

Lindsay Wu owns shares in Hydra Capital Pte Ltd, EdenRoc Sciences, Intravital Pty Ltd, and Continuum Biosciences Pty Ltd. He is a director of MetroBiotech NSW Pty Ltd, and Liberty Biosecurity Pty Ltd. Through the above he has a financial interest in NAD+ raising compounds, which are mentioned in this article. His lab receives funding from the National Health and Medical Research Council (NHMRC) of Australia, MetroBiotech NSW Pty Ltd, and has in the past received funding from Cancer Institute NSW. His salary is paid from an NHMRC RD Wright (Biomedical) Career Development Fellowship, which funds his employment at UNSW Australia, where he is an NHMRC Senior Research Fellow. He is a founding organiser of the Australian Biology of Ageing Conference series.

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Do you need to worry if your baby has a flat head?

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The search to extend lifespan is gaining ground but can we truly reverse the biology of ageing - EconoTimes

An Italian neurosurgeon is saying he plans on transplanting a head onto a donor body, not in some distant future, but by the end of 2017.

When Dr. Sergio Canavero first announced his plans a couple of years ago, most people thought he was either crazy, or it was a publicity stunt. Now Canavero says he will put the head of 30-year-old Russian Valery Spiridonov on a donor body in December. Spiridonov suffers from Werdnig-Hoffman disease, which is a form of spinal muscular atrophy.

The surgeon said the procedure would take humanity closer to extending life indefinitely.

Although Canavero insists everything is ready to go, a lot of the details remain murky, and it might still be more fantasy than reality.

Dr. David Albert Jones, the director of the Oxford-based Anscombe Bioethics Centre, says the risks associated with such an attempt are not justifiable.

The center is a Catholic academic institute that studies the moral issues surrounding medicine.

The current scientific and medical consensus is that this experiment has very little chance of success, Jones told Crux, adding the most likely outcome is either death during the operation or survival in a paralyzed state for a few hours or days.

Similar experiments have been done with small animals, to little success. No animal has ever come out of the procedure without being paralyzed, and they all have died soon after.

Jones said the studies are not even advanced enough to attempt the procedure on primates such as monkeys or chimpanzees, let alone a human subject.

There is nothing to suggest that the current proposal for a head transplant is realistic, Jones said, adding even if it were, it would not put mankind on a path to immortality.

People who have received donor organs live longer than they would have done, but they do not live longer, on average, than the average life expectancy of the general population, Jones said.

We will all die.

Jones did warn that if immortality became the goal of a society, this could be a real concern because the quest for unachievable goals can detract from the achievable goals of society, the realistic goals of healthcare, education and social solidarity.

Jones responded to some questions from Crux by email, and told us the scientific and ethical concerns about the proposed procedure.

Crux: Is this even possible with todays technology?

Jones: The idea of a head transplant (or a neck down body-transplant) has been attempted in animals but most animals have either died or have been completely paralyzed and none have lived more than a few days. Given the very poor outcome with mice at the present time it is very difficult to justify attempting this with primates, let alone with humans.

A key challenge is reconnecting the spinal cord. Only if we could finally overcome this problem in patients suffering from spinal cord injury (for example, by the use of gene therapy, stem cells and/or growth factors) would it be realistic to deliberately severe the spinal cord and reconnect the head to a different body.

Thought must also be given to the consequences if the body were to reject the new head. Could the head be kept alive apart from the body, and what kind of existence would this be?

Is such a transplant ethically permitted?

The current scientific and medical consensus is that this experiment has very little chance of success. The most likely outcome is either death during the operation or survival in a paralyzed state for a few hours or days.

The risks are such that it is not justifiable even with consent, but there is an added concern in that it seems likely that the patient has been given misinformation about the realistic prospects for success, and in these circumstances it seems doubtful that consent is properly informed.

It should also be noticed that the operation would not only take great financial and human resources but would also require a donor whose heart, lungs, liver, and/or kidneys could have given real benefits to several patients on the organ transplant waiting list. The opportunity costs would, at the very least, involve extending the suffering of these patients and could involve the death of a patient who might otherwise have been saved.

Many are saying that if such a surgery is successful, it puts humanity on the path to immortality. Should such a goal concern us?

There is nothing to suggest that the current proposal for a head transplant is realistic. If some time in the future the technical problems were overcome, it would not be the path to immortality any more than current, very successful, transplant medicine puts people on a path to immortality. People who have received donor organs live longer than they would have done, but they do not live longer, on average, than the average life expectancy of the general population. We will all die.

How can the Church do more to help people assess the morality of new biotechnologies and medical (or pseudo-medical) procedures?

The goal of immortality is unachievable. There is no need to be concerned therefore about the achievement of this goal. On the other hand if (virtual) immortality became the goal of a society, this could be a real concern because the quest for unachievable goals can detract from the achievable goals of society, the realistic goals of healthcare, education and social solidarity.

The virtue of temperateness is needed if society is to avoid such vain and destructive desires. The Church could do more to promote the virtues of temperateness and humility, which are necessary not only in relation to this issue but in the wider context of the care of creation.

How should the governments involved handle such things, both on a national and international level? I mean, it seems odd that this doctor is even being allowed to attempt this procedure, given the objections from many that the technology has not even been tested properly.

Governments should ensure that experimental surgery is subject to the same level of ethical scrutiny as the clinical trials of drugs or of medical devices. Unfortunately surgery is sometimes given a degree of latitude that leaves patients vulnerable to exploitation. Experimental procedures should not be permitted by a hospital unless and until it has been subject to scientific peer review and has satisfied a clinical ethics committee. It is difficult to see how the current proposal could fulfill such criteria.

The rest is here:
Should a head transplant be allowed to happen? - Crux: Covering all things Catholic