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Metformin's low-dose blood sugar effects linked to a brain Rap1 pathway

A post describes a Baylor-led study finding that metformin suppresses Rap1 in the hypothalamus, activating neurons that lower blood sugar.

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1 Source, 1h ago, first seen 1h ago

TLDR

A post describes a 2025 Science Advances study led by Baylor College of Medicine scientists that links metformin's low-dose effects to Rap1 in the brain. According to the post, neurons involved in the pathway respond to doses thousands of times smaller than those needed to affect peripheral organs. The author suggests the finding could inform future treatments aimed at slowing brain aging and cognitive decline.

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1 Source, first seen 1h ago

33 likes16 saves12 reposts

Combined views

912

1 Source, first seen 1h ago

33 likes16 saves12 reposts

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1 Source

Smart Science@SmartScienceWe thought we knew how the world's most popular diabetes drug worked — but a new discovery reveals its impact on the brain. The global medical community has long relied on metformin as the primary first-line defense against type 2 diabetes, operating under the assumption that it worked solely by curbing glucose production in the liver and gut. However, a new study has shattered this decades-old consensus. Researchers have discovered that metformin also acts directly on a hidden control center in the brain, revealing a highly sensitive neural pathway that actively regulates blood sugar levels at remarkably minute doses. Led by scientists at the Baylor College of Medicine and published in the journal Science Advances, the study demonstrated that metformin suppresses a specific protein called Rap1 within the brain's hypothalamus. By turning off this protein, the drug activates key neurons that signal the body to lower blood glucose, responding to doses thousands of times smaller than those required to affect peripheral organs. This newly unlocked brain connection not only rewrites our understanding of diabetes management but could also pave the way for novel treatments aimed at slowing brain aging and cognitive decline. source: Lin, H. Y., Lu, W., & Fukuda, M. (2025). Low-dose metformin requires brain Rap1 for its antidiabetic action. Science Advances, 11(31).1h
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    1 Source

    Smart Science@SmartScienceWe thought we knew how the world's most popular diabetes drug worked — but a new discovery reveals its impact on the brain. The global medical community has long relied on metformin as the primary first-line defense against type 2 diabetes, operating under the assumption that it worked solely by curbing glucose production in the liver and gut. However, a new study has shattered this decades-old consensus. Researchers have discovered that metformin also acts directly on a hidden control center in the brain, revealing a highly sensitive neural pathway that actively regulates blood sugar levels at remarkably minute doses. Led by scientists at the Baylor College of Medicine and published in the journal Science Advances, the study demonstrated that metformin suppresses a specific protein called Rap1 within the brain's hypothalamus. By turning off this protein, the drug activates key neurons that signal the body to lower blood glucose, responding to doses thousands of times smaller than those required to affect peripheral organs. This newly unlocked brain connection not only rewrites our understanding of diabetes management but could also pave the way for novel treatments aimed at slowing brain aging and cognitive decline. source: Lin, H. Y., Lu, W., & Fukuda, M. (2025). Low-dose metformin requires brain Rap1 for its antidiabetic action. Science Advances, 11(31).1h
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