Circadian rhythms in septic shock patients.

Area of Science:

• Immunology
• Chronobiology
• Genetics

Background:

• Sepsis and septic shock have high mortality rates despite intensive research.
• Immune cell function is influenced by circadian rhythms regulated by clock genes.
• Investigating clock gene rhythmicity in septic shock is crucial for understanding disease progression.

Purpose of the Study:

• To determine if clock gene expression rhythmicity is altered in patients with septic shock.
• To compare the rhythmicity of clock genes in septic shock patients to healthy individuals.

Main Methods:

• A prospective pilot study involving 20 septic shock patients.
• Blood samples were collected every 4 hours over 24 hours to isolate monocytes.
• Expression of 17 clock and clock-associated genes was measured, and a rhythmicity score was calculated.

Main Results:

• 77% of measured clock genes showed inconclusive rhythms in septic shock patients.
• Rhythmicity scores were significantly lower in septic shock patients (0.23) compared to healthy controls (0.70).
• Specific clock genes (CRY1, NR1D1, NR1D2, DBP, PER2) showed suppressed expression, while CRY2 was upregulated in septic shock patients.

Conclusions:

• Molecular rhythms in immune cells are substantially altered and decreased in septic shock patients.
• The observed decrease in rhythmicity is dependent on clock gene alterations.
• Further research is needed to elucidate the pathophysiological mechanisms linking altered clock gene expression to sepsis outcomes.