Bacteria-Brain Communication

FUNCTION OF NEUROTRANSMITTERS

GABA

Our brain, certain bacteria and fungi produce GABA.

It is a neurotransmitter that mutes neuronal activity, keeping stress, anxiety and depression in check. GABA also regulates the growth of embryonic and neural stem cells as well as influences the development of neural progenitor cells.

Scientists found that GABA deficiency in certain parts of the brain can trigger epilepsy.

This neurotransmitter plays a role in regulating pain and inhibits inflammation. Recent studies revealed that immune cells called macrophages also possess GABA receptors enabling microbes to ‘talk’ to them. Preliminary studies using Bifidobacterium dentium suggested bacteria may be able to reduce inflammation associated with inflammatory bowel disease, which is an immune response from our body’s police force.

The bacteria, Lactobacillus, has been shown to increase GABA Receptors and change emotional behavior. Prof John F Cryan pointed out, “bacteria play around with the same brain chemicals in the brain that antidepressants and anti-anxiety drugs do.” next time you feel depressed, eat a cup of yogurt – it is full of Lactobacillus.

Acetylcholine

Egg yolk is a very good source of choline, a nutrient needed to synthesize acetylcholine. It is also rich in an essential amino acid called ‘tryptophan’, which is metabolized into the neurotransmitter, serotonin.

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This ancient essential molecule is found in most of the cells in our body. It was around when the first single celled living organism appeared on earth and is used for fundamental cellular development and function. It is involved in secretion, absorption of nutrients, metabolism, membrane development and regulation of immune response. Acetylcholine (ACh) is needed for many vital functions, both non-neuronal and neuronal. Your mind will slow down if you are low on ach. Your body cannot function without ach to enable proper functioning of your cells.

Acetylcholine (Ach) disruption is a primary cause of depression. Damage to the Ach system cause memory problems. Researchers found 90% loss of acetylcholine in the brains of people suffering from Alzheimer's, which is a major cause of senility.

Ach is involved in REM (dream) sleep, which is the restorative part of the sleep cycle when the brain is more active.

It is responsible for much of stimulation of muscle including muscles in the gut, heart and lungs. Without Ach, your heart will stop beating, you cannot breathe. Lethal poisons of cobra, bacterium Clostridium botulinum, and puffer fish kill by targeting Ach to prevent neurotransmission.

It is a neuromodulator in both peripheral nervous system (PNS) and in the central nervous system (CNS).

ACh is needed for sensory perception (seeing & hearing), sustaining attention (increased responsiveness to sensory stimuli) and learning as well as encoding of new memories.

Serotonin

Refer to 'HAPPY FOODS‘ for food sources.

This neurotransmitter calms your nerves and is intimately involved with emotion and mood. It alleviates mood, improve cognitive function, facilitate greater concentration and vitality.

Research indicates Mycobacterium trigger release of serotonin. Mice fed Mycobacterium were put through stressful tasks. When the bacterium was removed from their diet, they continued to perform better than the control group for about three weeks. As the bacterium left their system, they gradually reverted to their normal selves.

Too little serotonin has been shown to lead to depression, problems with anger control, obsessive-compulsive disorder, and suicide. Too little also leads to craving for carbohydrates (starchy foods) and insomnia.

Stress hormones

Did you notice that when you are stressed, you are more susceptible to infection and have more aches and pains? Blame the stress hormones. Researchers found stress hormones increase pathogenic bacteria growth and virulence. The nasty microbes have receptors on their surface that can home in on stress hormones released by our body during physical or mental stress. [BMC Microbiology, Volume 14]

Adrenaline and Norepinephrine are stress hormones that enhance growth of pathogenic bacteria and help them to attach more firmly to host cell. That is why when you are stressed, pathogenic bacteria growth explodes. Cortisols are stress hormones that lowers your immunity, decrease libido and increase blood pressure and sugar.

A 2008 study led by psychologist Simon Knowles found that stool samples taken from Australian University students during exam week contained fewer lactobacilli compared to the relatively untroubled first days of the semester.

Stress chemicals not only increase pathogenic microbes, they seem to reduce beneficial microbes as well. Studies using rodents and monkeys produce the same result.

More on chemicals produced by your body: JUMBLEBLOG: CHEMISTRY OF SLEEP