Scientists say that when they are found, microorganisms can have a great impact on our mental state.
Scientists, our body is considered to be more protected of some intestinal microorganisms, human brain is possible to come together to say. And even the healthiest people can take them as guests in the brain, they report the Science magazine. Generally microorganisms belonging to three bacterial groups: Firmikutes, Proteobacteria and Bacteroidetes.
Researchers from the United States announced their findings Tuesday during the annual meeting of the Neurosciences Society in San Diego (California, USA). There, Rosalinda Roberts, a neuroanatomist from the University of Alabama in Birmingham, USA, apparently displayed images of bacteria living and penetrating into the cells of the human brain. Researchers don't dare to determine whether these bacteria are beneficial or harmful to the brain.
Microbes in all samples
Five years ago, Roberts reported that a high-resolution, electron-microscope rod-shaped object found five years ago, only cutting the brain tissue of dead people. For years, these elements were ignored by experts, but in 2018 a bacteriologist assured them that they were bacteria in neuroanatomy.
Researching the pathologies in the brains of people suffering from schizophrenia, Roberts team examined the tissue of 34 people. About half of them were half as healthy as previously mentioned, and found the presence of microorganisms in all samples.
Preferred areas for brain bacteria
As scientists later observations show, bacteria usually live in star-shaped cells called astrocytes that interact with neurons. Microbes are grouped around and at the ends of astrocytes surrounding the blood vessels in the blood-brain barrier.
Microorganisms also appear to be more abundant around long projections of neurons in a fatty substance called myelin. Roberts cannot explain these preferences, but thinks the bacteria in these parts of the brain are likely to fall into fat and sugar.
Experiments in mice
Roberts thought that intestinal bacteria could infiltrate into the brains through blood vessels during the hours between death and brain extraction.
Thus, he looked at the brains of healthy rats analyzed immediately after slaughter.
All found bacteria and more. Later, Roberts observed the brains of germ-free mice that were carefully grown so as not to be surrounded by microbial life, and found that all of the brain tissues were clean.
Most of the bacteria we eat live in the intestine. It is possible for microorganisms to reach the brain through the blood vessels, through the intestinal nerves or through the nose.
The expert acknowledges that further experimentation is still necessary to eliminate contamination because the tissues may be contaminated by air by microbes left in the surgical instruments during the extraction of the brain.
Deadly danger or contribution to the immune system
This is very important for medicine because it may cause life-threatening inflammations in the case of access to brain bacteria and viruses. The possibility of microorganisms to play a key role in our mental health is also taken into account. However, there is currently no evidence that these microorganisms cause inflammation.
On the other hand, Teodor Postolache, a psychiatrist at the University of Maryland, confirmed that, for this new finding, he was "not surprised that other things could live in the brain", but "if that was the case, he would be revolutionary." According to Postolache, if these common intestinal bacteria are a useful entity around the brain cells, they can play an important role in regulating the immune activity of the brain.