Toll-like receptor kinetics in septic shock patients: a preliminary study

The Relationship Between Sepsis-induced Immunosuppression and Serum Toll-like Receptor 9 Level

BACKGROUND/AIM

Our aim was to determine serum TLR-9 levels in sepsis and evaluate the relationship between sepsis and serum TLR-9 levels.

MATERIALS AND METHODS

The study group consisted of 80 consecutive patients with sepsis and 100 healthy individuals. The demographic characteristics, co-morbidities and hemodynamic data of all patients were recorded.

RESULTS

TLR-9 serum levels in sepsis were statistically significantly lower compared to the control group. It was also seen that when the lactate level was >5 mmol/l in patients in the sepsis group, the serum TLR-9 levels were substantially higher.

CONCLUSION

There is a relationship between sepsis-induced immunosuppression and serum TLR-9 levels. The host immunity system can be activated by means of TLR-9-related systems, while hyperlactatemia may play a stimulating role in the re-activation of the immune system.

Rhein inhibits lipopolysaccharide-induced intestinal injury during sepsis by blocking the toll-like receptor 4 nuclear factor-κB pathway

Sepsis is one of the leading causes of mortality in severe systemic inflammatory syndrome. The endotoxin-induced inflammatory response has been linked to the development of sepsis. Rhein is a lipophilic anthraquinone isolated from Rheum rhabarbarum (rhubarb), which has a protective effect on intestinal damage in vivo. However, the underlying mechanism responsible for the protective effects of rhein remains to be elucidated. In the present study, mice were exposed to 20 mg/kg lipopolysaccharide (LPS), prior to being treated with either 100 mg/kg rhein or 0.3 mg/kg toll‑like receptor 4 (TLR4) signaling inhibitor TAK‑242. In the rhein‑treated mice, the colon length (cm) was extended and colon injury was attenuated. In addition, treatment with rhein significantly decreased the expression levels of the LPS‑induced inflammatory cytokines interleukin (IL)‑1β, IL‑6, IL‑8, and tumor necrosis factor‑α, in both the plasma and colon tissue. However, mice treated with TAK‑242 exhibited increased expression levels of IL‑10, as determined by ELISA and western blot analysis. In addition, immunohistochemistry and western blot analyses demonstrated that treatment with rhein was able to reduce TLR4 expression and inhibit nuclear factor‑κB (NF‑κB) phosphorylation in colon tissue. Furthermore, LPS induction was blocked by TAK‑242. These results demonstrate that the observed rhein‑attenuated inflammatory response during sepsis may be achieved via the TLR4 NF‑κB signaling pathway. In conclusion, the results of the present study provide a novel insight into the protective effects of rhein on LPS‑induced intestinal inflammation, and demonstrate that rhein may act as a beneficial therapeutic agent in the treatment of sepsis-induced intestinal damage.

Toll-like receptor 2 in serum: a potential diagnostic marker of prosthetic joint infection?

Prosthetic joint infection (PJI) is a severe complication of arthroplasty and is still lacking diagnostic gold standards. PJI patients display high Toll-like receptor 2 (TLR2) serum levels, correlating with canonical inflammatory markers (C-reactive protein [CRP], interleukin 6 [IL-6], tumor necrosis factor alpha [TNF-α], and IL-1). Therefore, TLR2 serum levels could be considered a new potential diagnostic tool in the early detection of PJI.