Phospholipase C activator m-3M3FBS protects against morbidity and mortality associated with sepsis.

J Immunol Aug 15, 2012

  • Sang Doo Kim
  • Hak Jung Kim
  • Jae Woong Shim
  • Ha Young Lee
  • Sung Kyun Lee
  • Soonil Kwon
  • Young Su Jung
  • Suk-Hwan Baek
  • Joon Seong Park
  • Brian A Zabel
  • Yoe-Sik Bae

Although phospholipase C (PLC) is a crucial enzyme required for effective signal transduction and leukocyte activation, the role of PLC in polymicrobial sepsis remains unclear. In this study, we show that the direct PLC activator m-3M3FBS treatment significantly attenuates vital organ inflammation, widespread immune cell apoptosis, and mortality in a mouse sepsis model induced by lethal cecal ligation and puncture challenge. Mechanistically, m-3M3FBS-dependent protection was largely abolished by pretreatment of mice with the PLC-selective inhibitor U-73122, thus confirming PLC agonism by m-3M3FBS in vivo. PLC activation enhanced the bactericidal activity and hydrogen peroxide production of mouse neutrophils, and it also enhanced the production of IFN-γ and IL-12 while inhibiting proseptic TNF-α and IL-1β production in cecal ligation and puncture mice. In a second model of sepsis, PLC activation also inhibited the production of TNF-α and IL-1β following systemic LPS challenge. In conclusion, we show that agonizing the central signal transducing enzyme PLC by m-3M3FBS can reverse the progression of toxic shock by triggering multiple protective downstream signaling pathways to maintain organ function, leukocyte survival, and to enhance microbial killing.


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