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Strong Support
mechanistic
Analysis v2
History

Consuming 2 grams of leucine leads to a measurable increase in a specific molecular marker (phosphorylation of ribosomal protein S6 at Ser240/244) in skeletal muscle tissue within 30 to 180 minutes,...

43
Pro
0
Against

Mechanism

Synthesis from 1 study

How it works

Leucine from food enters muscle cells and turns on a molecular switch that moves a key protein machine to the right location inside the cell. Once there, it activates a signal that tells the cell’s protein factory to start working faster, leading to more muscle protein being made.

Most probable mechanism

In Simple Terms

When leucine enters muscle cells, it binds to specific sensors that release a brake on a protein complex called mTORC1. This allows mTORC1 to move to the edges of the cell and onto nutrient-rich structures called lysosomes, where it becomes fully active. Once active, mTORC1 tags a ribosomal protein with a phosphate group, which helps the cell's protein-making machinery start building new muscle proteins more efficiently.

Causal chain
1

Leucine is absorbed from the bloodstream into skeletal muscle cells.

Supported by evidence
which leads to
2

Intracellular leucine binds to leucine-sensing proteins, which解除对GATOR2复合物的抑制，使其激活。

Indirect evidence only
which leads to
3

Activated GATOR2 promotes the recruitment of mTORC1 to the lysosomal surface via Rag GTPases.

Verified by multiple studies
which leads to
4

mTORC1 translocates to the peripheral cell membrane and lysosomal surface, where it encounters activating signals and downstream substrates.

Verified by multiple studies
which leads to
5

Localized mTORC1 becomes fully activated and phosphorylates ribosomal protein S6 at Ser240/244.

Verified by multiple studies
which leads to
6

Phosphorylated S6 enhances ribosomal efficiency and the initiation of mRNA translation, increasing the rate of myofibrillar protein synthesis.

Verified by multiple studies

Evidence from Studies

Supporting (1)

43

Community contributions welcome

43

Leucine ingestion promotes mTOR translocation to the periphery and enhances total and peripheral RPS6 phosphorylation in human skeletal muscle

Randomized Controlled Trial
Human
2023 Feb

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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Source Study

Leucine ingestion promotes mTOR translocation to the periphery and enhances total and peripheral RPS6 phosphorylation in human skeletal muscle

Score: 43
DOI: 10.1007/s00726-022-03221-w

Similar Assertions

In young, healthy men who exercise recreationally, consuming leucine is linked to specific molecular changes in muscle cells that are thought to support increased muscle protein synthesis.

43
0
90%

Consuming 2 grams of leucine in young, healthy, active men is linked to measurable changes in the location of mTOR proteins within muscle cells within an hour, which are processes connected to the start of muscle protein synthesis.

43
0
87%

When young, healthy men who exercise regularly consume leucine, the molecular signals that promote muscle growth are stronger near the outer edges of their muscle fibers than near the center, suggesting that the location of these signals within the fiber may matter for how muscle responds.

43
0
81%

After consuming 2 grams of leucine, the level of a specific molecular signal in muscle cells at one hour is related to how quickly muscle proteins are built over the next three hours in young, active men.

43
0
80%

Taking leucine — a protein building block — might turn on muscle-building signals in your muscles, but if you're already training and eating enough protein, it won't actually make you stronger, bigger, or recover faster.

20
0
79%