Matcha Tea Powder Has Antidepressant-Like Effects

Summary: Researchers say Matcha, a traditional Japanese tea, can help boost mood and mental performance. Match tea powder activates dopaminergic neural networks and improves depressive symptoms in mice that previously experienced stress as a result of social isolation.

Source: Kumamoto University

Matcha, a traditional Japanese tea, has been touted for its health benefits—it can boost mood and mental performance in humans and mice alike—but more mechanistic research is required. Hence, researchers from Japan evaluated the anti-depressive effects of Matcha tea powder in mice.

The powder activates dopaminergic neural circuits and improves depression in certain mice, depending on the animal’s prior mental state. More studies like this could help develop better antidepressants.

Depression is currently the most prevalent mental disorder in the world and the number of people affected by it continues to grow. Although the onset of depression varies among individuals, it is believed that the disease commonly stems from a reduction in dopamine in the brain.

Dopamine, a neurotransmitter and hormone, plays an important role in elevating one’s mood and making a person feel happy, accomplished, and motivated.

And while various antidepressants have been developed to counter the effect of low dopamine, these have many side effects. Moreover, people may develop resistance to antidepressants, requiring higher doses with time, or a frequent change in medication. These problems gave impetus to the search for natural products with anti-depressant effects.

One such product, Matcha, has recently gained popularity. Sourced from the leaves of Camellia sinensis—which are rich in mood-boosting compounds—Matcha powder is traditionally used to make tea.

Consumption of this tea has shown to improve anxiety-like behavior in mice by activating dopamine function via dopamine D1 receptor signaling. The resultant dopamine boost could improve the symptoms of depression as well. So, Dr. Yuki Kurauchi of Kumamoto University led a team of researchers to investigate the effects of Matcha tea powder in socially isolated mice.

They have detailed their findings in a paper published in Nutrients.

The team used stress-tolerant BALB/c and stress-susceptible C57BL/6J mice subjected to social isolation stress for their experiments. Orally administering a Matcha tea suspension, however, appeared to reduce levels of depression in the stress-susceptible mice. This was indicated by their performance in tail suspension tests (TST), which are commonly used to evaluate depression in mice.

Dr. Kurauchi clarifies, “Matcha tea reduced the immobility time only in stress-susceptible mice that experienced greater stress from social isolation, and exhibited higher depression-like behavior, in comparison to the stress-tolerant mice.”

How did this happen? The team dug deeper. An immunohistochemical analysis of the mice brains revealed activation of the prefrontal cortex (PFC) and nucleus accumbens (NAc) in the stress-susceptible mice after they had consumed the Matcha tea suspension. These regions form an important part of the dopaminergic circuit and are crucial for controlling dopamine levels in the brain.

Their activation—indicated by an increase in the number of cells expression c-Fos, an important indicator of neural activity—would typically boost dopamine levels, elevating one’s mood.

This shows a matcha tea
Sourced from the leaves of Camellia sinensis—which are rich in mood-boosting compounds—Matcha powder is traditionally used to make tea. Image is in the public domain

Stress-susceptible mice with a shorter immobility time also had more c-Fos-positive cells in the ventral tegmental area (VTA) of their brains (which initiates dopaminergic activity), as well as in the PFC and NAc, indicating higher neural activity and dopamine production. In contrast, none of these effects were seen in stress-tolerant mice.

This was further cemented by another finding—administering a dopamine D1 receptor blocker to stress-susceptible mice negated the antidepressant-like effects of Matcha tea suspension. Dr. Kurauchi ties it all together.

“These results suggest that Matcha tea powder exerts an antidepressant-like effect by activating the dopaminergic system of the brain, and this is influenced by the mental state of the individual.”

Dr. Kurauchi is optimistic about the future implications of their research. While evaluating antidepressants in individuals, the differences in their mental conditions should now be considered, as well, given how sensitive stress-susceptible mice were to the effect of Matcha tea suspension, but stress-tolerant mice were not.

“Also, incorporating Matcha into health promotion programs has potential to improve its widespread utility,” he says.

About this depression research news

Author: Press Office
Source: Kumamoto University
Contact: Press Office – Kumamoto University
Image: The image is in the public domain

Original Research: Open access.
Matcha Tea Powder’s Antidepressant-like Effect through the Activation of the Dopaminergic System in Mice Is Dependent on Social Isolation Stress” by Yuki Kurauchi et al. Nutrients


Matcha Tea Powder’s Antidepressant-like Effect through the Activation of the Dopaminergic System in Mice Is Dependent on Social Isolation Stress

Matcha tea powder is believed to have various physiological benefits; however, its detailed mechanism of action has been poorly understood.

Here, we investigated whether the mental state of mice, due to social isolation stress, affects the antidepressant-like effect of Matcha tea powder by using the tail suspension test.

Oral administration of Matcha tea powder reduced the duration of immobility in the stress-susceptible C57BL/6J strain, but not in BALB/c strain. In C57BL/6J mice, SCH23390, a dopamine D1 receptor blocker, prevented Matcha tea powder from exerting its antidepressant-like effect.

Matcha tea powder also increased the number of c-Fos-positive cells in the prefrontal cortex (PFC) region and the nucleus accumbens (NAc) region in C57BL/6J mice, but not in BALB/c mice.

In contrast, Matcha tea powder did not change the number of c-Fos-positive cells in the ventral tegmental area (VTA) region. Notably, C57BL/6J mice with a shorter immobility time had a higher number of c-Fos-positive cells in the PFC, NAc, and VTA regions. However, no such correlation was observed in the stress-tolerant BALB/c mice.

These results suggest that Matcha tea powder exerts an antidepressant-like effect through the activation of the dopaminergic system including the PFC-NAc-VTA circuit and that mental states are important factors affecting the physiological benefits of Matcha tea powder.

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  1. It appears that your article “Matcha Tea Powder Has Antidepressant-Like Effects” from 3/16/23, by Dr. Yuki Kurauchi of Kumamoto University, contained data that was gathered from the inhumane testing of sentient beings. Researchers investigated the effects of Matcha tea powder in socially isolated mice (already a stressed group of mice) by submitting them to TST (tail suspension tests), which consists of hanging mice by their tails for no less than 6 minutes, with no access to relief (i.e., denied the ability to touch or reach near-by walls or floors to even slightly ease the tail suspension pain). These isolation-stressed mice were tested in this manner in order to calculate their new added stress levels. Which also means that these stress levels must have been tested against the stress levels of mice who also went through the isolation period, as well as the TST tests, but were not given the Matcha tea powder. All this disregard of humane treatment to assess the viability of Matcha MAYBE being useful for its antidepressant properties for human beings. I am not a scientist, doctor or researcher. I am just a human being who does not understand why it is acceptable to intentionally cause pain and stress to sentient beings for the sole reason of possibly leading to useful information toward the increased comfort levels of the human race; or, just because we can. I know first-hand the relief that can be gained through the use of antidepressants. There are ways, however, of investigation/research that do not include the “stressing” and/or torture of those creatures that may not be able to process a research grant, earn a degree or profit from the findings of endless testing, but none-the-less are living, feeling, sentient beings with which we share this planet. These beings have a right to be left alone; they ask nothing of us and owe us nothing. I believe it speaks so loudly that our “top of the food chain” status allows us to live without respect for the rights of other beings.

    1. Thank you for this well thought out and written comment. I completely agree and appreciate your opinion.

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