An Observational Cohort Study of the Kynurenine to Tryptophan Ratio in Sepsis: Association with Impaired Immune and Microvascular Function
2011

Kynurenine to Tryptophan Ratio in Sepsis and Its Effects

Sample size: 120 publication 10 minutes Evidence: moderate

Author Information

Author(s): Darcy Christabelle J., Davis Joshua S., Woodberry Tonia, McNeil Yvette R., Stephens Dianne P., Yeo Tsin W., Anstey Nicholas M.

Primary Institution: Global Health Division, Menzies School of Health Research and Charles Darwin University

Hypothesis

IDO activity in sepsis would be related to plasma interferon-γ, interleukin-10, T cell lymphopenia and impairment of microvascular reactivity.

Conclusion

Increased IDO activity in sepsis is associated with dysregulated immune responses and impaired microvascular reactivity.

Supporting Evidence

  • The plasma KT ratio was increased in sepsis compared to controls.
  • In response to treatment of severe sepsis, the median KT ratio decreased significantly.
  • IDO activity was significantly increased in sepsis patients compared to controls.

Takeaway

When people get very sick from infections, their bodies break down a substance called tryptophan into something called kynurenine, which can make it harder for their immune system to work properly.

Methodology

An observational cohort study of 80 sepsis patients and 40 hospital controls, measuring plasma amino acids and microvascular reactivity.

Limitations

The study did not directly measure IDO expression.

Participant Demographics

80 sepsis patients (50 severe and 30 non-severe) and 40 hospital controls.

Statistical Information

P-Value

p<0.0001

Confidence Interval

IQR 64–235

Statistical Significance

p<0.0001

Digital Object Identifier (DOI)

10.1371/journal.pone.0021185

Want to read the original?

Access the complete publication on the publisher's website

View Original Publication