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mechanistic
Analysis v3
History

Leucine binds to a specific calcium channel on POMC neurons in the brain, causing these neurons to activate and send signals that reduce food intake.

62
Pro
0
Against

Mechanism

Synthesis from 2 studies

How it works

Leucine turns on fullness signals by binding to a calcium channel called Cav3.1 in brain cells that tell you to stop eating. It also turns off hunger signals by blocking a different calcium channel in cells that make you want to eat. Both actions reduce food intake.

Most probable mechanism

In Simple Terms

Leucine sticks directly to a specific calcium channel called Cav3.1 on brain cells that signal fullness. This makes the channel open more easily, letting calcium flow into the cell. The calcium surge turns on these fullness cells, which send signals to other brain areas to stop eating and reduce food intake.

Causal chain
1

Leucine binds to a hydrophobic pocket on the Cav3.1 voltage-gated calcium channel

Verified by multiple studies
which leads to
2

Binding of leucine lowers the voltage threshold required for Cav3.1 channel opening

Verified by multiple studies
which leads to
3

Cav3.1 channel opening allows extracellular calcium to enter POMC neurons

Verified by multiple studies
which leads to
4

Increased intracellular calcium concentration depolarizes and activates POMC neurons

Verified by multiple studies
which leads to
5

Activated POMC neurons transmit signals to downstream brain regions that suppress feeding behavior

Verified by multiple studies

Less supported by current evidence, but not ruled out

In Simple Terms

Leucine blocks a different type of calcium channel in hunger-promoting brain cells, reducing calcium entry and silencing these cells. This removes the drive to eat, leading to reduced food intake.

Causal chain
1

Leucine inhibits store-operated calcium channels in NPY/AGRP neurons

Verified by multiple studies
which leads to
2

Reduced calcium influx hyperpolarizes NPY/AGRP neurons

Verified by multiple studies
which leads to
3

Suppressed NPY/AGRP neuron activity decreases AGRP peptide secretion

Verified by multiple studies
which leads to
4

Reduced AGRP signaling diminishes orexigenic drive to downstream feeding circuits

Verified by multiple studies

Evidence from Studies

Supporting (2)

62

Community contributions welcome

57

Rapid sensing of l-leucine by human and murine hypothalamic neurons: Neurochemical and mechanistic insights

Case-Control Study
Human & Animal & In Vitro
2018 Apr
6

Cav3.1 is a neuronal leucine sensor that mediates satiety and weight loss in response to dietary protein

Case-Control Study
Animal & In Vitro
2026 May 5

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

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Similar Assertions

Leucine, a dietary amino acid, binds to a specific site on the Cav3.1 ion channel and reduces the voltage needed for the channel to open, which leads to activation of neurons.

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84%

Leucine, an amino acid from dietary protein, activates the Cav3.1 protein in hypothalamic neurons, which triggers signals that reduce hunger.

6
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78%

In mice, the Cav3.1 calcium channel in hypothalamic neurons responds to the amino acid leucine and directly affects how much the animals eat and their body weight.

6
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77%

Changing a specific part of the Cav3.1 protein prevents it from sending signals that tell the body it is full after eating protein.

6
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76%

Blocking Cav3.1 ion channels reduces the activity of POMC neurons when leucine is present and prevents leucine from reducing appetite in mice.

6
0
76%

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