Inhibition of cytokine release by and cardiac effects of type IV phosphodiesterase inhibition in early, profound endotoxaemia in vivo

Stevan P. Tofovic, Lefteris C. Zacharia, Joseph A. Carcillo, Edwin K. Jackson

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

1. In rats, inhibition of type IV phosphodiesterase (PDE4) attenuates acute renal failure and early (hours) mortality induced by high-dose endotoxin. Because it is unlikely that protection of renal function accounts for improved early survivability, most likely PDE4 inhibition exerts multiple beneficial effects in endotoxaemia and the purpose of the present study was to test this hypothesis. 2. In study 1, we determined, in anaesthetized rats, the effects of endotoxin (30 mg/kg, i.v.) on cardiac performance parameters (heart rate (HR), ventricular peak systolic pressure (VPSP), maximum positive change in left ventricular pressure with respect to time (+dP/dt), maximum negative change in left ventricular pressure with respect to time (-dP/dt(max)), ventricular end-diastolic pressure (VEDP), ventricular minimum diastolic pressure (VMDP) and HR-pressure product), plasma catecholamine levels, plasma renin activity (PRA) and plasma levels of inflammatory cytokines (tumour necrosis factor (TNF)-α and interleukin (IL)-1β). 3. In study 2, we determined, in anaesthetized rats, whether inhibition of PDE4 attenuates lipopolysaccharide (LPS)-induced changes in the aforementioned parameters of heart performance and neurohumoral status. We compared the changes in these parameters induced by endotoxaemia in animals treated with either RO 20-1724 (10 μg/kg per min; a selective PDE4 inhibitor) or its vehicle (DMSO; 1.35 μL/min). 4. At 90 min postadministration, endotoxin significantly increased HR and reduced -dP/dt(max) and VEDP and caused a several-fold increase in plasma levels of TNF-α, IL-1β, noradrenaline, adrenaline and PRA. RO 20-1724 significantly blunted the endotoxin-induced reduction in -dP/dt(max) and decreased endotoxin-induced increases in TNF-α and IL-1β, without significantly altering endotoxin-induced changes in HR, VEDP, catecholamine levels and PRA. 5. Results from these studies indicate that, in addition to preserving renal function, PDE4 inhibition attenuates inflammatory cytokine release caused by high-dose endotoxin and may have protective effects on diastolic function in early profound endotoxaemia.

Original languageEnglish
Pages (from-to)787-792
Number of pages6
JournalClinical and Experimental Pharmacology and Physiology
Volume27
Issue number10
DOIs
Publication statusPublished - 2000

Keywords

  • Adrenergic agonists
  • Cytokines
  • Endotoxin
  • Sepsis
  • Ventricular function

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