Prostaglandin F2α Affects the Cycle of Clock Gene Expression and Mouse Behavior

Area of Science:

• Chronobiology
• Molecular Biology
• Pharmacology

Background:

• Prostaglandins and their receptors influence gene expression.
• The prostaglandin F receptor (Ptgfr) role in biological rhythms was previously unknown.

Purpose of the Study:

• Investigate the relationship between Ptgfr and circadian rhythms.
• Determine the impact of Ptgfr deficiency on clock gene expression.

Main Methods:

• Locomotor activity period measurements in Ptgfr-knockout (KO) and wild-type mice under constant dark conditions.
• Analysis of clock gene expression (Cry1, Cry2, Per2) in the suprachiasmatic nucleus and liver.
• In vitro experiments using PTGFR agonists and Per2::luciferase reporter assays.

Main Results:

• Ptgfr-KO mice displayed longer locomotor periods under constant dark conditions.
• Reduced cryptochrome 1 (Cry1) expression was observed in the suprachiasmatic nucleus of Ptgfr-KO mice.
• Significant alterations in Cry1, Cry2, and Period2 (Per2) mRNA levels were found in the liver of Ptgfr-KO mice.
• Plasma prostaglandin F2α (PGF2α) levels exhibited circadian rhythmicity in wild-type mice.
• PTGFR agonist addition modulated Per2::luc activity in a time-dependent manner.

Conclusions:

• The prostaglandin F receptor (Ptgfr) is involved in regulating biological rhythms.
• Circadian rhythms of plasma PGF2α may drive clock gene expression.
• PGF2α and Ptgfr-targeting drugs represent potential modulators of the biological clock.