The clinical scenario of trauma and severe hemorrhage is characterized by an overwhelming activation of several inflammatory mediators and by modification of the interactions between leukocytes and endothelial cells, leading to sequestration of neutrophils into the tissues and organs. Clinical observations suggest that pediatric trauma victims have lower incidence of multiple organ dysfunction syndrome (MODS) than adult patients. However, the precise molecular mechanisms are not clear. In preliminary in vivo studies we have found that under physiological conditions, lung expression of the peroxisome proliferator activated receptor-y PARY), a nuclear receptor with putative anti-inflammatory role, is a function of the aging process and is maximally expressed at young age, while it declines in mature rats. This age-dependent decline of PPARy expression inversely correlates with phosporylation of the extracellular signal-regulated kinase 1 and 2 (ERK 1/2), protein kinases known to be capable of modifying PPARy activity. We also have found that mature rats, when subjected to hemorrhagic shock, exhibit a more pronounced lung and liver injury when compared with young rats. Our hypothesis is that the severity of the systemic inflammatory response during hemorrhagic shock is age-dependent and is modulated at the nuclear level by a diverse regulation of the PPARy pathway. Three interrelated specific aims will test this hypothesis. (1) We will define the age-dependency of the PPARy pathway during the aging process under normal physiological conditions and after hemorrhagic shock in vivo. (2) With """"""""gain-of-function"""""""" and """"""""loss-of-function"""""""" studies, we will evaluate the precise role of the PPARy pathway on the systemic inflammatory response during hemorrhagic shock in vivo in young and mature rats. (3) We will identify the molecular mechanisms of the age-dependent dysregulation of PPARy by evaluating the role of the upstream regulatory kinases ERK1/2. A common clinical observation in intensive care units is that pediatric patients are less susceptible to develop multiple organ dysfunction syndrome and recover relatively uneventfully than adult trauma victims. Our project is aimed to identify the molecular mechanisms responsible of the diverse inflammatory response in the adult and the pediatric patients, and will provide valuable information for the developing of novel therapeutic approaches for the treatment of trauma and hemorrhage.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
5R01AG027990-05
Application #
8130779
Study Section
Surgery, Anesthesiology and Trauma Study Section (SAT)
Program Officer
Fuldner, Rebecca A
Project Start
2007-09-01
Project End
2013-08-31
Budget Start
2011-09-01
Budget End
2013-08-31
Support Year
5
Fiscal Year
2011
Total Cost
$286,761
Indirect Cost
Name
Cincinnati Children's Hospital Medical Center
Department
Type
DUNS #
071284913
City
Cincinnati
State
OH
Country
United States
Zip Code
45229
Kim, Paul; Piraino, Giovanna; O'Connor, Michael et al. (2018) Metformin Exerts Beneficial Effects in Hemorrhagic Shock in An AMPK?1-Independent Manner. Shock 49:277-287
Matsiukevich, Dzmitry; Piraino, Giovanna; Klingbeil, Lindsey R et al. (2017) The AMPK Activator Aicar Ameliorates Age-Dependent Myocardial Injury in Murine Hemorrhagic Shock. Shock 47:70-78
Klingbeil, Lindsey R; Kim, Paul; Piraino, Giovanna et al. (2017) Age-Dependent Changes in AMPK Metabolic Pathways in the Lung in a Mouse Model of Hemorrhagic Shock. Am J Respir Cell Mol Biol 56:585-596
Botez, Gabriela; Piraino, Giovanna; Hake, Paul W et al. (2015) Age-dependent therapeutic effects of liver X receptor-? activation in murine polymicrobial sepsis. Innate Immun 21:609-18
Hobson, Michael J; Hake, Paul W; O'Connor, Michael et al. (2014) Conditional deletion of cardiomyocyte peroxisome proliferator-activated receptor ? enhances myocardial ischemia-reperfusion injury in mice. Shock 41:40-7
Samraj, Ravi S; Zingarelli, Basilia; Wong, Hector R (2013) Role of biomarkers in sepsis care. Shock 40:358-65
Kaplan, Jennifer M; Zingarelli, Basilia (2011) Novel Therapeutic Agents in Pediatric Sepsis: Peroxisome Proliferator Receptor ? (PPAR ?) Agonists. Open Inflamm J 4:120-124
Chima, Ranjit S; Maltese, Giuseppe; Lamontagne, Timberly et al. (2011) C-peptide ameliorates kidney injury following hemorrhagic shock. Shock 35:524-9
Chima, Ranjit S; LaMontagne, Timberly; Piraino, Giovanna et al. (2011) C-peptide, a novel inhibitor of lung inflammation following hemorrhagic shock. Am J Physiol Lung Cell Mol Physiol 300:L730-9
Solan, Patrick D; Piraino, Giovanna; Hake, Paul W et al. (2011) Liver X receptor ? activation with the synthetic ligand T0901317 reduces lung injury and inflammation after hemorrhage and resuscitation via inhibition of the nuclear factor ?B pathway. Shock 35:367-74

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