OBJECTIVE: The incidence of multiple organ failure in pediatric trauma victims is lower than in the adult population. However, the molecular mechanisms are not yet defined. We investigated whether the pathophysiologic characteristics of hemorrhage-induced lung injury may be age dependent and may be regulated by the peroxisome proliferator-activated receptor gamma (PPARgamma). DESIGN: Prospective, laboratory investigation that used an established rodent model of hemorrhagic shock. SETTING: University hospital laboratory. SUBJECTS: Young (n = 67; 3-5 months old) and mature (n = 66; 11-13 months old) male rats. INTERVENTIONS: Hemorrhagic shock was induced in young and mature rats by withdrawing blood to a mean arterial blood pressure of 50 mm Hg. After 3 hours, rats were rapidly resuscitated by infusing the shed blood and killed 3 hours thereafter. MEASUREMENTS AND MAIN RESULTS: In young rats, lung injury was characterized by accumulation of red cells and neutrophils at the end of the resuscitation period; on Western blot analysis, lung expression of intercellular adhesion molecule-1 was increased. In contrast, the severity of lung injury was more pronounced in mature rats. Lung myeloperoxidase activity and expression of constitutive and inducible intercellular adhesion molecule-1 was significantly higher in mature rats compared with young rats. Mature rats also had higher plasma levels of cytokines and chemokines compared with young rats. This heightened inflammation was associated with higher degree of activation of nuclear factor-kappaB and down-regulation of PPARgamma and heat shock factor-1 in the lung of mature rats compared with young rats. Treatment with the PPARgamma ligand, the cyclopentenone prostaglandin 15-deoxy-Delta-prostaglandin J2, ameliorated lung injury in young, but not in mature animals. CONCLUSIONS: Lung injury after severe hemorrhage is age dependent and may be secondary to a diverse regulation of PPARgamma.
OBJECTIVE: The incidence of multiple organ failure in pediatric trauma victims is lower than in the adult population. However, the molecular mechanisms are not yet defined. We investigated whether the pathophysiologic characteristics of hemorrhage-induced lung injury may be age dependent and may be regulated by the peroxisome proliferator-activated receptor gamma (PPARgamma). DESIGN: Prospective, laboratory investigation that used an established rodent model of hemorrhagic shock. SETTING: University hospital laboratory. SUBJECTS: Young (n = 67; 3-5 months old) and mature (n = 66; 11-13 months old) male rats. INTERVENTIONS:Hemorrhagic shock was induced in young and mature rats by withdrawing blood to a mean arterial blood pressure of 50 mm Hg. After 3 hours, rats were rapidly resuscitated by infusing the shed blood and killed 3 hours thereafter. MEASUREMENTS AND MAIN RESULTS: In young rats, lung injury was characterized by accumulation of red cells and neutrophils at the end of the resuscitation period; on Western blot analysis, lung expression of intercellular adhesion molecule-1 was increased. In contrast, the severity of lung injury was more pronounced in mature rats. Lung myeloperoxidase activity and expression of constitutive and inducible intercellular adhesion molecule-1 was significantly higher in mature rats compared with young rats. Mature rats also had higher plasma levels of cytokines and chemokines compared with young rats. This heightened inflammation was associated with higher degree of activation of nuclear factor-kappaB and down-regulation of PPARgamma and heat shock factor-1 in the lung of mature rats compared with young rats. Treatment with the PPARgamma ligand, the cyclopentenoneprostaglandin 15-deoxy-Delta-prostaglandin J2, ameliorated lung injury in young, but not in mature animals. CONCLUSIONS:Lung injury after severe hemorrhage is age dependent and may be secondary to a diverse regulation of PPARgamma.
Authors: E Mariani; L Pulsatelli; A Meneghetti; P Dolzani; I Mazzetti; S Neri; G Ravaglia; P Forti; A Facchini Journal: Mech Ageing Dev Date: 2001-09-15 Impact factor: 5.432
Authors: M C McDonald; H Mota-Filipe; A Paul; S Cuzzocrea; M Abdelrahman; S Harwood; R Plevin; P K Chatterjee; M M Yaqoob; C Thiemermann Journal: FASEB J Date: 2001-01 Impact factor: 5.191
Authors: Ranjit S Chima; Paul W Hake; Giovanna Piraino; Prajakta Mangeshkar; Alvin Denenberg; Basilia Zingarelli Journal: Crit Care Med Date: 2008-10 Impact factor: 7.598
Authors: Michael G Vish; Prajakta Mangeshkar; Giovanna Piraino; Alvin Denenberg; Paul W Hake; Michael O'Connor; Basilia Zingarelli Journal: Crit Care Med Date: 2007-05 Impact factor: 7.598
Authors: Lindsey R Klingbeil; Paul Kim; Giovanna Piraino; Michael O'Connor; Paul W Hake; Vivian Wolfe; Basilia Zingarelli Journal: Am J Respir Cell Mol Biol Date: 2017-05 Impact factor: 6.914
Authors: Patrick D Solan; Giovanna Piraino; Paul W Hake; Alvin Denenberg; Michael O'Connor; Alex Lentsch; Basilia Zingarelli Journal: Shock Date: 2011-04 Impact factor: 3.454