Everything you need to know about aging in one massive yet simple post
Our cells are programmed to die.
In nature, cells of an organism replace the ones that die (or are killed). But as the organisms age, the regenerative properties decreases. And eventually, new cells are not created as fast as they are removed causing several disorders and degenerative diseases and even cancers and eventually death.
It has been sometimes pointed out it’s ,more natural to die of a disease or a parasitic infliction than of old age.
(Note: This is based on our current understanding)
HOW IS GRAVITY LINKED TO AGING?
Our bodies are designed to survive and operate in “Earth environment” which means everything since the time we were a zygote (the first product of egg and sperm fertilisation) to the time we die is designed in accordance to the climate we are to live in.
Studies have shown that in zero gravity conditions (like the ones astronauts experience) the normal bodily functions are disrupted. On returning to the planet, they experience disorientation, reduced calcium absorption, low red blood cell count ie anemic symptoms, muscular dystrophy etc, everything consistent with the aging process. But the thing is, astronauts can recover from these symptoms quickly whereas aging people cannot. So, zero gravity condition or even a lack of “head to toe” gravity effect (bed rest condition that spreads out the effect of gravity through the chest area) cause an acceleration in aging process.
It has also been pointed out by Einstein’s theory of relativity that you’ll age faster if you stand on the top of the stairs than on the ground where the gravitational effect is more. There is nothing alarming about it as its really just one billionth part of a second if the lifetime is considered 79 years. But this happens because of the flow of time. An elevated atomic clock has been found to tick faster than the one on the ground.
The Biology of Aging
Aging is a very complex process. It has not yet been fully understood.
Like I mentioned above, cells are programmed to die. They sometimes kill themselves or are killed if they are damaged or infected. It occurs through a complex mechanism. Also many cells do not divide after reaching maturity, so, when they die, they are not replaced.
The oxygen that gives life and takes it away too.
You need anti-oxidants. Here’s why:
The oxygen that you breathe gives you life but it also corrodes your system from within by converting itself into reactive oxygen species (ROS) a free radical that’s very reactive. It can cause impairment to the cell organelles (the tiny sub –cellular work houses of the cell that essentially allow you to live by helping the genetic material produce gene products (like RNA and proteins). These ROS along with UV rays of the sun, affect the DNA severely hampering its usual processes, including the life-saving repair mechanisms and affecting the cells in various ways (as documented below) thereby damaging tissues and organs and finally leading to diseases and death.
a)DNA Repair mechanisms are damaged over time.
I found a nice animated video to guide you through the preliminary process of DNA replication ie, the essential process of copying the genetic information from one cell to another (a new/daughter cell) to help us live and perform life processes naturally.
As mentioned above, the cumulative processes of the damaging effects of many environmental factors, mutagens and ROS can disrupt these very processes and as a result, mistakes in coding (proper base pairing) take place that hamper the cells in a big way.
b)The energy house of the cell gets impaired
The mitochondria is a small organelle present in our cells that produces the necessary energy for your life processes. The energy currency is the ATP. Sometimes, due to various reasons (ROS/ toxicity), the structure and function of these energy houses get damaged and as a result energy production is affected. This might result in impaired cellular processes and hence cellular/ process malfunctioning.
c) Telomere shorten leading to senescence and eventual cell death
These two videos (please watch in sequence if you have time) will guide you as to why telomeres (end parts of the chromosomes are so important especially when it comes to protecting the DNA and also because of their important part in the aging game.
- How telomeres are linked with aging, and how stress and lifestyle aggravate these processes:
d) Cellular miscommunication and bad gene products.
Just like the internet, all cells are connected with each other through a complex network that helps them communicate and “pass information”.
It can be described as a lock and key model where a certain molecule like a gene product/externally administered drug/ growth hormone will fit a lock (a specific receptor, usually on the surface of the cell) and trigger a series of events like a chain reaction.
So when the DNA is damaged, it might not produce the desired key molecule or may over produce it, in these cases, the trigger creates bad, bad results.
Not only does the over-expression or the under-expression of gene products but also their malformation that hamper our integral systems. The protein is also known as a gene product and is vitally important for sustaining our life force. During its formation (folding into a specific ‘key’ structure), it can get damaged and therefore cannot perform its function properly.
(I will not go into the details of cellular signalling mechanisms for this post but I will just explain one more point in that regard.)
I read in this article that a group of people in Ecuador who do not have a proper signalling pathway response w.r.t. a growth hormone, do not get cancer. Since, cancer is also linked to a growth factor over expression and unregulated cell division as a result of a cascading trigger effect, individuals who do not express this growth factor due to a gene mutation do not gain height (they are up to 4 ft tall) and are immune to a variety of diseases that affects the rest of us.
This area is a promising field to study anti-aging properties and also anti-cancer properties by creating artificial products that mimic their natural counterparts.
The science behind anti-aging creams.
This is a screenshot from a post I wrote in September, 2013. (HGP=HUMAN GENOME PROJECT)
Supplementing your diet with collagen and elastin (2 proteins/ gene products) can slow the aging process.
What about the much sought after stem cells? Shouldn’t they repair/replace aging tissues and organs?
It has been observed that even stem cells also lose their regenerative properties when they age.
Graphic text alert:
You might get squeamish if you are not a non-science, especially a non-bioscience person, so you may skip this part as I have already covered everything till here.
Last year, while I was a MSc student and before I applied for an internship at the Tropical School of Medicine in Calcutta, we had had the honour of listening to the founder of the research department for regenerative diseases there in the form of a departmental seminar. The speaker was a medical practitioner apart from being a brilliant researcher and speaker; he talked about how stem cells can be used to regenerate damaged liver tissues (to treat liver cirrhosis) and also aid in treating people who are close to having a renal failure. He talked about the elixir of life (in scientific terms ) and the human obsession with regeneration and rejuvenation. Strangely, he also explained the underlying principles of certain “dark arts” practices where he explained how some sects “initiate” new members by making them eat *ahem* the brain of a stillborn human child from the cemetery. (because babies=youth=stem cells= regenerative properties) and also how some old member of the sect would share a new mother’s milk (it contains colostrum that help the baby build immunity). Further more, he also explained how childbirth is an immune response of the maternal body. The fully developed fetus is considered as a foreign object and the body tries to eliminate it. It has not yet been fully understood why sperms being foreign objects are not immediately suppressed by a female immune response. The inferences regarding the dark arts maybe gross but symbolic but there’s a profound reason behind these practices. And it was enthralling to hear a renowned doctor and geneticist talk about these ideas and propel a new generation of young scientists towards a focussed work/research in the area.
©2013-2015, The Idea Bucket. Written by Ananya.
The author has a masters degree in science with a specialisation in genomics and cytogentics. She is a lifestyle blogger and a freelance writer. She is studying to be a computer programmer to further her career in bio-informatics/genomics. You can contact here here: firstname.lastname@example.org.