Upon Aging and Longevity

Becoming Aware of the Influence of Bacteria Upon Aging and Longevity

 

There exists a fair-sized research community whose members think about extending healthy human life by manipulating the long term operation of metabolism. They are looking at small and incremental gains, however, and don't expect success in their work over the next ten to twenty years to go much beyond providing a few additional years of life and generally better health throughout life. This will be achieved through ways of mimicking calorie restriction or other life-extending genetic and epigenetic alterations discovered in mice. This is a far cry from the quality and quantity of life extension we'd expect to emerge from a mature SENS technology base, focused on repair of the low-level biological damage that causes aging, but it is the focus of the mainstream - much as we'd like that to be different.

In this world of incremental advances and manipulation of metabolism, researchers are becoming increasingly aware that they cannot ignore the vast population of symbiotic bacteria we carry with us throughout our lives. You can look back in the Fight Aging! archives to see that evidence has emerged in recent years to support the idea that changes in gut bacteria may be significant for long-term health:

• Intestinal Bacteria and Ageing
• Aging and the Role of Your Bacteria

Quote:

The intestinal microbiota is important for maintenance of host health, providing energy, nutrients and protection against invading organisms. Although the colonic microbiota is relatively stable throughout adult life, age-related changes in the gastrointestinal (GI) tract, as well as changes in diet and host immune system reactivity, inevitably affect population composition. Recent studies indicate shifts in the composition of the intestinal microbiota, which may lead to detrimental effects for the elderly host.

Here is a more recent paper on the same topic, entitled "Gut microbiota as a candidate for lifespan extension", which looks toward turning understanding into action:

Quote:

On the basis of recent knowledge in worms, flies, and humans, an important role of the gut microbiota in aging and longevity is emerging. The complex bacterial community that populates the gut and that represents an evolutionary adapted ecosystem correlated with nutrition appears to limit the accumulation of pathobionts and infections in all taxa, being able of affecting the efficiency of the host immune system and exerting systemic metabolic effects. There is an urgent need to disentangle the underpinning molecular mechanisms, which could shed light on the basic mechanisms of aging in an ecological perspective. Thus, it appears possible to extend healthy aging and lifespan by targeting the host as a metaorganism by manipulating the complex symbiotic ecosystem of gut microbiota, as well as other possible ecosystems of the body.

I think we'll be seeing more of this line of thinking in the years ahead - it hasn't been greatly explored and there's an increasing level of interest in slowing aging through metabolic manipulation. This fits right in to that research community and its interests.

Skin Cells Turned into Brain Cells

 

Another step forward for the field of regenerative medicine: researchers have "discovered a novel way to convert human skin cells into brain cells ... Rather than using models made in yeast, flies or mice for disease research, all cell-reprogramming technology allows human brain, heart and other cells to be created from the skin cells of patients with a specific disease. The new cells created from the skin cells contain a complete set of the genes that resulted in that disease - representing the potential of a far-superior human model for studying illnesses, drugs and other treatments. In the future, such reprogrammed skin cells could be used to test both drug safety and efficacy for an individual patient with, for example, Alzheimer's disease.

... This technology should allow us to very rapidly model neurodegenerative diseases in a dish by making nerve cells from individual patients in just a matter of days - rather than the months required previously. ... used two genes and a microRNA to convert a skin sample from a 55-year-old woman directly into brain cells. (MicroRNAs are tiny strands of genetic material that regulate almost every process in every cell of the body.) The cells created [exchanged] the electrical impulses necessary for brain cells to communicate ...

Using microRNA to reprogram cells is a safer and more efficient way than using the more common gene-modification approach. In ensuing experiments, [the researchers hope] to rely only on microRNAs and pharmaceutical compounds to convert skin cells to brain cells, which should lead to more efficient generation of cells for testing and regenerative purposes."

An interview with one of the Thiel Fellows:

"The goal is to extend the healthy human lifespan. In the past couple of decades, we've learned a lot about the basic science of aging. Now it's time to start translating the basic science into marketable therapies. I want to find and fund the projects creating those therapies. ...

When I was eight, my mom told me about death and I couldn't stop crying for days. What a tragedy! Life is incredible, but death is inevitable. I already knew biology was fantastic fun.

But that moment, for me, made science more than fun. It made it into a power that could save lives. And I couldn't imagine doing something more fascinating or important. ... When I was twelve, I was lucky enough to meet Cynthia Kenyon (biogerontologist and molecular biologist), who is a pioneer in the field of anti-aging research. She is amazing. I ended up working in her lab, at the University of California San Francisco, for a few years. She had a way of describing scientists as detectives, trying to solve mysteries and catch genetic culprits.

Growing up at UCSF, getting to tinker with tiny worms in a biology lab and sit in on classes about genetics and biochemistry ... that was an incredible experience. ... Anti-aging is such an important field, but it is underfunded.

Building business around an anti-aging therapy is no mean feat, especially when the FDA does not recognize aging as a disease. The goal here is to create a profitable, self-sustaining structure that will fund a portfolio of anti-aging projects, and then commercialize the research. It will be important that scientists get a stable source of funding for long-term lifespan projects, and a cut of the revenue from the projects they create."