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Holobionts: a new Paradigm to Understand the Role of Humankind in the Ecosystem

You are a holobiont, I am a holobiont, we are all holobionts. "Holobiont" means, literally, "whole living creature." It ...

Showing posts with label Virus. Show all posts
Showing posts with label Virus. Show all posts

Wednesday, May 25, 2022

Can our bacteria and virus friends save us? The rise of psychobiotic therapies for the human holobiont

 


The effect of the gut microbiota on the brain in the human holobiont is an incredibly complex story. It is described in a review appeared in 2019 on the "Physiological Reviews" journal. Not so much a review as a whole treatise, it is huge, with 1694 references in the bibliography!!! You can find a more readable summari on the blog "gut microbiota for health"

Before going on, a note of caution: as it is the rule nowadays, most of what appears in the medical literature is biased or simply false as the result of the widespread corruption of the medical research system. This review has been partly sponsored by the pharmaceutical industry, nevertheless it seems reasonably free of hype for specific treatments or wonder drugs. Its approach is correctly evolutionary, for instance when they say:

"Given that there has never been a time when mammals existed without microbes (apart from under highly restrictive laboratory conditions), there has also never been a time when the brain has been without signals from the gut, and it is important to consider the relationship between the host and its microbiota from an evolutionary perspective"

And they have it perfectly right when they use the magic word "holobiont"!!!

"The hologenome theory may even account for complex biological phenomena such as certain behaviors. For instance, behavior that facilitates social interaction among holobionts might be considered evolutionarily adaptive/advantageous as it gives rise to greater transmission of microbiota, thereby enhancing genetic variation (1285, 1286, 1689). In light of these inextricable links between the microbiota and the brain throughout evolutionary history, it is imperative for the study of our own biology (and that of the entire animal kingdom) to understand how microbial symbionts influence brain physiology and behavior."

The main point of the paper is that the human brain is strongly influenced by the gut, that our behavior, to the point that modifying the gut composition can be seen as a form of "psychobiotic therapy" that improves plenty of pathological situations and improves also the quality of life, for instance helping against depression. 

Seeing how the world is behaving nowadays, it would seem that the human microbiome is in bad conditions, indeed. Especially the gut of our leaders seems to have been invaded by micro-monsters instead of the beneficial gut flora that's normal for humans. And, surely, the various habits of hyper-cleaning, distancing, and self-suffocation that became fashionable during the past two years didn't help in improving the situation. Maybe, at this point, only our bacterial and viral friends can help us (with a little support also from our friendly archaea and fungi). Go, friends, go! We need you badly! 





Wednesday, April 7, 2021

The Vaccine of Ancient Times: Sharing Water

 The "Old Normal" was an age that spanned from the end of the last Ice Age to the start of the Covid Age. One of the weird things that the people used to do during those remote times was to collectively dip their fingers into a horrible soup of bacteria and viruses called "holy water." Then, they engaged in a ritual gesture that involved touching one's own face with their fingers still wet with that water. How could they survive that remains a mystery. (image source)

 

Last week, I stopped to visit a church in my neighborhood. An eerie silence reigned among the benches where no one seemed to have been sitting for ages. The holy water bowls at the entrance of the deserted church were completely dry -- not even a trace of humidity! They had been replaced by disinfecting gel bottles. You see both the empty bowl and the gel bottle in the picture. Maybe the priest had blessed the gel?

The elimination of the holy water dispenser would seem to be an obvious thing to do. Think of the unhygienic condition of the water: with people dipping their fingers into it, it must have rapidly become a cocktail of viruses and bacteria, maybe holy, but surely unhealthy

But, amazingly, these "stoups" of holy water are a very ancient tradition. They go back to the very origins of Christianity. Were our ancestors so stupid to pass germs to each other in this way?

It is a diffuse hobby to think that our ancestors were ignorant and superstitious. But if they had been really so ignorant and superstitious, we wouldn't be here. If the holy water rituals were killing people, that would have been noted and people would have stopped using them

But all the variants of Christian religiosity include this kind of ablution rituals. Islam does, too, although in different forms. And many other religions include communal ablutions. These rituals go very deep into the very essence of religion. Whether it is water, wine, or bread, it doesn't matter: it is the sharing that counts. And if those habits were supposed to be purification rituals, they had to purify something.

There is a good reason why purification rituals were good for the health of the faithful. They were early forms of vaccination. 

Think about that: the idea of a vaccine is to put a person in contact with some forms of pathogens in order to stimulate one's natural resistance. An early form of vaccination was called "variolation" (from the Latin term "variola," "smallpox"). It goes back to several centuries ago and it consisted of actually infecting people with smallpox. The idea was to have them develop a mild infection that would then protect them from more dangerous forms. Later, variolation was replaced with vaccination using a live form of the smallpox virus, taken from cows. And, of course, our modern vaccines are small miracles of molecular biology, but they do basically the same thing. They put our bodies in direct contact with some forms of the pathogen we want to fight.

You see that our ancestors were doing the same with their ablution rituals. Of course, they knew nothing about bacteria and viruses but, again, they were not stupid. They tried many things and they kept what worked. The idea of communal ablutions was to put everyone in contact with the skin biome of the whole community, sharing the "good" germs and stimulating an immune reaction that would protect the person from worse infections. That was done also outside religious practices -- in Buddhist countries, for instance, there is no equivalent of the holy water basin of the West, but they do have a tradition of communal bathing.

These old traditions could also go beyond ablution. Look at the picture: it is the "Madonna del Parto" in the Church of St. Augustine in Rome. If you go there, you are supposed to kiss the foot of the statue for good luck. Imagine many people kissing it, one after the other. Can you imagine a better way to transfer bacteria and viruses to one another? Actually, the foot is in silver, known to have some bactericidal properties. The idea may have been that, yes, it is good to share germs in this way, but let's not exaggerate. But, surely, if you didn't want bacteria to spread, you'd better avoid that people would kiss the Madonna's foot, rather than making it in silver! They wanted some germs to be transferred!

So, the ancients had empirically understood the concept that today we call "holobiont."  Our bodies are not single organisms, we are colonies of microscopic creatures: our microbiome. These creatures are part of us and, among the many good things they do for us, one is to protect us from the external microbes that tend to invade our bodies. The microbes living on our skin are the first line of defense we have, but we are protected by multiple defensive layers. The active immune system, the "adaptive" one, is the final layer. It enters into action only after that the other lines have been breached. Your microbiome makes sure that it rarely happens. It is part of the good thing that is being a holobiont!

But there is more than sharing water in being holobionts. It is a deep and significant way to show that we belong to a community, which we can see as a higher-order holobiont. The basic idea of religion, any religion, is sharing. Sharing is the essence of the great planetary holobiont we call sometimes Gaia, from which we came and to which we return. Without sharing, there is no God/Goddess, no community, no life. 

Something of this attitude has filtered through the rather anodyne ritual of modern vaccination, with many people reporting a feeling of spiritual completeness after receiving their vaccine against the Covid pandemic. They felt they had done their duty in protecting not just themselves, but the whole community and they were proud of having shared the burden with everyone else. Which is the way any good holobiont should feel! 

Of course, this kind of feeling depends on trusting that you are doing the right thing. One thing is dipping one's finger in a bowl of holy water: you trust your local community. Another is to have synthetic RNA being delivered inside one's cells to operate the molecular mechanisms of protein creation: you trust science.  

Is science an entity worth our trust? Trust is not bestowed by definition, it must be earned. And we must say that the composite entity we call "science" has not been always up to the standards that would make it deserve everyone's trust. Especially in recent times, scientists have shown attitudes involving petty squabbles, greed, ignorance, subservience to power, arrogance, political partisanship, and more. That explains the diffuse resistance against the modern forms of vaccination, perceived as a violation of one's body. Scientists must do much better than they are doing now if they want to maintain the trust that the community still places on them.

In the end, we keep making the same mistake we have been doing for quite some time: contrasting religion with science, as if the former were superstition and the latter the truth. It is not like that. They are different forms of understanding ourselves and the world (and, eventually, understanding is sharing). 

Even in health care, we are creating a schizophrenic situation by creating an artificial contrast that doesn't need to exist. Are we sure that we did well in abolishing the basins of holy water? They were ways to "prime" our skin microbiome against infection. With our emphasis on molecular vaccines, we forgot that the human defense system is multilayered. And if this first line of defense works, we are not necessarily forced to recur to more invasive ones.

Worse, we are forgetting that being human means sharing with others. Saint Francis would kiss lepers when he met them. We don't need to go to such extremes, but we still need to remember that we are human. Masked, disinfected, and isolated, as we all are nowadays, we are declaring that we are not willing to share anything with anyone. Are we still human? And, if we are, why we treat each other as if we weren't?