Sulforaphane acutely activates multiple starvation response pathways.
Level 5 - mechanism / opinion, no new human data
In vitro laboratory study in an immortalized human cell line (bench research).
PubMed 39867556 · doi:10.3389/fnut.2024.1485466
What was done
Immortalized human retinal pigment epithelial cells were treated with sulforaphane (SFN) to assess if it acts as a fasting or caloric restriction mimetic. The authors evaluated mitochondrial mass, resistance to oxidative stress, mTORC1/2 signaling markers, autophagic flux and lysosomal biogenesis, glucose uptake, lactate secretion, thioredoxin-interacting protein (TXNIP) mRNA and protein levels (with and without exogenous glucosamine), glycolytic and TCA cycle intermediates, pyruvate dehydrogenase phosphorylation, and gene expression via 4-hour RNA-seq.
What was found
The abstract reports directional changes without numerical values or effect sizes. SFN treatment increased mitochondrial mass and oxidative stress resistance, suppressed mTORC1/2 markers by inhibiting insulin signaling, upregulated autophagy/lysosomal biogenesis, and amplified rapamycin- or nutrient deprivation-induced autophagic flux. SFN acutely reduced glucose uptake and lactate secretion followed by an adaptive rebound linked to early TXNIP transcriptional downregulation (reversed by exogenous glucosamine). It altered glycolytic and TCA intermediates, reduced inhibitory phosphorylation on pyruvate dehydrogenase, and activated starvation-responsive transcriptional signatures.
Why it matters
This study provides cellular mechanistic evidence that sulforaphane mimics caloric restriction, which may explain its therapeutic effects across disease models.
Limits
This study was conducted entirely in vitro using a single immortalized human cell line, with no in vivo animal or human clinical validation. The abstract reports no quantitative values, concentrations, effect sizes, or sample replicate numbers.
Cited by
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