Leptin Protects Against Mortality and Organ Dysfunction in A Two-Hit Trauma/Sepsis Model and is IL-6-Dependent

Lukas Leopold Negrin*, Andreas Jahn, Martijn van Griensven

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

INTRODUCTION: Leptin is thought to play an important role in the regulation of the immune system. In patients, leptin is inversely proportional to interleukin-6 (IL-6) levels. Thus, the objective of our study was to evaluate a dose-dependent therapeutic impact of leptin with possible IL-6-dependency on immune actions and outcome in a trauma/sepsis model.

MATERIALS AND METHODS: Sixty-nine wild-type and 63 IL-6 mice were subdivided into three groups: trauma/sepsis group (first hit: femur fracture and hemorrhage; second hit: cecal ligation and puncture 2 days later), trauma group (first hit and laparotomy), sham group (laparotomy only). Each group received vehicle or leptin (2.5 μg/g (leptin1) or 5 μg/g (leptin2)) subcutaneously and was observed for 8 days after induction of the first hit. Mortality, humoral, and cellular immune markers were determined.

RESULTS: We revealed a dose-dependent anti-inflammatory effect of exogenous leptin in the sepsis groups and to some extent a pro-inflammatory effect in the sham groups. Leptin administration resulted in a decreased mortality in septic wild-type mice (trauma/sepsis vehicle group: 36.4%, trauma/sepsis leptin1 group: 25%, trauma/sepsis leptin2 group: 0%) and in an increased mortality in septic IL-6 mice (53.8%, 83.4%, 100%). All mice of the trauma groups and sham groups survived. In wild-type trauma/sepsis mice, exogenous leptin led to increased levels of CD4 and CD8 in the spleen, and a less pronounced type IV hypersensitivity (P ≤ 0.039). Furthermore, it decreased the levels of tumor necrosis factor-α and IL-6, not reaching statistical significance.

CONCLUSIONS: Due to the fact that leptin administration to traumatized and septic mice seems to have a positive effect on their outcome via IL-6 and does not negatively impact their medical condition if applied preventively, leptin might be a therapeutic agent for the prevention, or treatment of sepsis-related detrimental outcome after initial trauma.

Original languageEnglish
Pages (from-to)130-137
Number of pages8
JournalShock
Volume48
Issue number1
DOIs
Publication statusPublished - Jul 2017
Externally publishedYes

Keywords

  • Animals
  • Anti-Inflammatory Agents/therapeutic use
  • Immunity, Cellular/drug effects
  • Immunity, Humoral/drug effects
  • Interleukin-6/deficiency
  • Leptin/therapeutic use
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Sepsis/blood
  • Wounds and Injuries/blood
  • SURVIVAL
  • IMMUNE-RESPONSE
  • CYTOKINES
  • MORBIDITY
  • PATHWAY
  • OB/OB MICE
  • immune system interaction
  • trauma
  • multiple hit
  • SEPSIS
  • Adipokines
  • leptin
  • BODY-WEIGHT
  • INFLAMMATION
  • PLASMA LEPTIN
  • sepsis

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