An Intact Krüppel-like factor 9 Gene Is Required for Acute Liver Period 1 mRNA Response to Restraint Stress

Area of Science:

• Chronobiology
• Molecular Biology
• Genetics

Background:

• Circadian rhythms are regulated by transcription-translation feedback loops.
• The Period 1 (PER1) gene is a key component of these loops.
• Glucocorticoids (GCs) and stress influence circadian rhythms via the glucocorticoid receptor (GR).

Purpose of the Study:

• To investigate the role of Krüppel-like factor 9 (KLF9) in stress-induced Per1 gene transcription.
• To determine if KLF9 is necessary for the liver's circadian response to acute stress.

Main Methods:

• Exposing wild-type (WT) and Klf9 null mice (Klf9-/-) to restraint stress.
• Measuring plasma corticosterone (B) levels.
• Quantifying liver Per1 mRNA levels via RT-qPCR.
• Administering B injections to WT and Klf9-/- mice.

Main Results:

• Restraint stress increased liver Per1 mRNA in WT mice but not in Klf9-/- mice.
• Plasma corticosterone levels increased similarly in both genotypes after stress.
• B injections induced similar Per1 mRNA increases in both WT and Klf9-/- mice.

Conclusions:

• An intact KLF9 gene is required for the liver's Per1 mRNA response to acute stress.
• The role of GCs in this stress-induced response warrants further investigation.