Accession Number : ADA632081


Title :   Geldanamycin Inhibits Hemorrhage-Induced Increases in Caspase-3 Activity: Role of Inducible Nitric Oxide Synthase


Descriptive Note : Journal article


Corporate Author : ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD


Personal Author(s) : Kiang, Juliann G ; Bowman, Phillip D ; Lu, Xinyue ; Li, Yansong ; Wu, Brian W ; Loh, Horace H ; Tsen, K T ; Tsokos, George C


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA632081


Report Date : 24 May 2007


Pagination or Media Count : 12


Abstract : Hemorrhage has been shown to increase inducible nitric oxide synthase (iNOS) and deplete ATP levels in tissues and geldanamycin limits both processes. Moreover, it is evident that inhibition of iNOS reduces caspase-3 and increases survival. Thus we sought to identify the molecular events responsible for the beneficial effect of geldanamycin. Hemorrhage in mice significantly increased caspase-3 activity and protein while treatment with geldanamycin significantly limited these increases. Similarly, geldanamycin inhibited increases in proteins forming the apoptosome (a complex of caspase-9, cytochrome c, and Apaf-1). Modulation of the expression of iNOS by iNOS gene transfection or siRNA treatment demonstrated that the level of iNOS correlates with caspase-3 activity. Our data indicate that geldanamycin limits caspase-3 expression and protects from organ injury by suppressing iNOS expression and apoptosome formation. Geldanamycin, therefore, may prove useful as an adjuvant in fluids used to treat patients suffering blood loss.


Descriptors :   *ANTIBIOTICS , *HEMORRHAGE , *NITRIC OXIDE , *SYNTHASES , HEMORRHAGIC SHOCK , INHIBITION , JEJUNUM , LUNG , ORGANS(ANATOMY) , PROTEINS , SURVIVAL(GENERAL) , TISSUES(BIOLOGY)


Subject Categories : Medicine and Medical Research
      Pharmacology
      Inorganic Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE