Chronic photoperiod disruption impairs hepatic protein-synthetic function, which is fully restored by exogenous melatonin in rats
Constant light exposure for 21 days reduced albumin levels by 15.7% in male and 15.9% in female rats, and suppressed BMAL1 and CLOCK expression by over 70% while increasing PER2. Melatonin treatment (12 mg/L in drinking water) fully restored all circadian protein expression and normalized protein synthesis parameters to control levels in both sexes.
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Chronic photoperiod disruption impairs hepatic protein-synthetic function, which is fully restored by exogenous melatonin in rats The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 26/100 (low).
The Claim
Chronic photoperiod disruption impairs hepatic protein-synthetic function, which is fully restored by exogenous melatonin in rats
This conclusion is most relevant to: 240 adult Wistar rats (120 males, 120 females).
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Circadian dysregulation as a factor in impaired hepatic protein-synthetic function under chronic photoperiod disruption: the role of sex and chronobiotic correction. (Biology of sex differences, 2026) —
How It Works
The proposed biological pathway:
- ▸Constant light disrupts circadian clock gene expression in the liver
- ▸BMAL1 and CLOCK expression are suppressed by over 70%
- ▸PER2 expression paradoxically increases by 28.9-35.0%
- ▸These changes are strongly correlated with reduced albumin production, indicating impaired hepatic protein synthesis
Who Might Benefit
Evidence fit by population:
- ▸240 adult Wistar rats (120 males, 120 females)
Recommended Dose
12 mg/L melatonin in drinking water
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Animal model (rats) limits direct generalizability to humans
- ▸Only one type of circadian disruption (constant light) was tested; other forms of desynchronosis may yield different results
Frequently Asked Questions
What is the main finding of this study?▼
Chronic exposure to constant light disrupts liver clock proteins (BMAL1, CLOCK, PER2) and reduces albumin production by about 16% in both male and female rats. Melatonin treatment fully reverses these effects.
How does melatonin affect liver function under circadian disruption?▼
Melatonin (12 mg/L in drinking water) fully restored the expression of BMAL1, CLOCK, and PER2 and normalized total protein and albumin levels to control values in both sexes.
Is there a sex difference in response to circadian disruption?▼
Yes, two-way ANOVA showed a significant interaction between lighting conditions and sex (F=7.2, p<0.05), indicating sexual dimorphism in susceptibility to desynchronosis.
Can BMAL1 be used as a marker for liver problems?▼
Yes, BMAL1 expression was the strongest independent predictor of albumin levels (β=0.52, p<0.0001) and showed high predictive performance for hypoalbuminemia (AUC=0.87-0.89).
References
- 1.Areshidze DA, Kozlova MA, Anurkina AI, Chernikov VP, Gladyshev NS. “Circadian dysregulation as a factor in impaired hepatic protein-synthetic function under chronic photoperiod disruption: the role of sex and chronobiotic correction..” Biology of sex differences, 2026. PMID: 42401921 DOI: 10.1186/s13293-026-00949-y