Flavonoids inhibit MCT1-mediated transport of GHB, altering its pharmacokinetics and reducing sleep time in rats
In vitro, flavonoids such as luteolin, morin, and phloretin competitively inhibited MCT1-mediated uptake of GHB in rat MCT1-transfected cells, with IC50 values of 0.41, 6.41, and 2.57 μM, respectively. In vivo, intravenous luteolin (10 mg/kg) co-administered with GHB (1000 mg/kg) in rats significantly increased renal and total clearance of GHB and reduced sleep time from 165 ± 10 minutes to 121 ± 5 minutes.
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Flavonoids inhibit MCT1-mediated transport of GHB, altering its pharmacokinetics and reducing sleep time in rats The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 26/100 (low).
The Claim
Flavonoids inhibit MCT1-mediated transport of GHB, altering its pharmacokinetics and reducing sleep time in rats
This conclusion is most relevant to: Rats (Sprague-Dawley, likely male, not specified in abstract).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Flavonoids modulate monocarboxylate transporter-1-mediated transport of gamma-hydroxybutyrate in vitro and in vivo. (Drug metabolism and disposition: the biological fate of chemicals, 2007) —
How It Works
The proposed biological pathway:
- ▸Flavonoids (e.g., luteolin) competitively inhibit MCT1 transporter at the renal tubule
- ▸Inhibition reduces MCT1-mediated renal reabsorption of GHB
- ▸Increased renal clearance of GHB leads to lower systemic exposure
- ▸Result: Reduced GHB-induced sleep time in rats
Who Might Benefit
Evidence fit by population:
- ▸Rats (Sprague-Dawley, likely male, not specified in abstract)
Recommended Dose
Luteolin 10 mg/kg i.v.; GHB 1000 mg/kg i.v.
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Animal study (rats) with limited generalizability to humans
- ▸Only one flavonoid (luteolin) tested in vivo; effects of other flavonoids not confirmed in living animals
Frequently Asked Questions
What flavonoids were found to inhibit GHB transport?▼
Apigenin, biochanin A, chrysin, diosemin, fisetin, genistein, hesperitin, kaempferol, luteolin, morin, narigenin, phloretin, and quercetin inhibited MCT1-mediated GHB uptake in vitro; flavonoid glycosides phloridzin and rutin had no effect.
How much did luteolin reduce sleep time in rats?▼
Luteolin (10 mg/kg i.v.) reduced GHB-induced sleep time from 165 ± 10 minutes to 121 ± 5 minutes, a reduction of about 44 minutes.
What is the mechanism by which flavonoids affect GHB?▼
Flavonoids competitively inhibit the monocarboxylate transporter 1 (MCT1), which is responsible for renal reabsorption of GHB. This inhibition increases GHB clearance from the body, reducing its duration of action.
Are flavonoids substrates for MCT1?▼
No, the study found that [3H]kaempferol and [3H]biochanin A did not exhibit MCT1-mediated uptake, indicating these flavonoids are inhibitors but not substrates of MCT1.
References
- 1.Wang Q, Morris ME. “Flavonoids modulate monocarboxylate transporter-1-mediated transport of gamma-hydroxybutyrate in vitro and in vivo..” Drug metabolism and disposition: the biological fate of chemicals, 2007. PMID: 17108059 DOI: 10.1124/dmd.106.012369