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- W2026496721 abstract "1 Monophosphoryl lipid A (MLA) is a non-pyrogenic derivative of Salmonella lipopolysaccharide. Administration of this agent at high doses to rats and at low doses to dogs was previously shown to confer marked protection against ischaemia-reperfusion 24 h later, although the cellular mechanisms of this delayed protection are obscure. We hypothesized that MLA pretreatment causes the induction of the 70 kDa cytoprotective stress protein HSP70i in the myocardium. If this were the case, protection against ischaemia-reperfusion injury would be observed both in vitro and in vivo. 2 Rabbits were pretreated with MLA 0.035 mg kg−1, i.v. or vehicle solution. For the in vitro study, hearts were isolated 24 h later and Langendorff-perfused with Krebs-Henseleit buffer at 37°C. Global ischaemia was induced for 20 min followed by 120 min reperfusion. Recovery of post-ischaemic left ventricular function and lactate dehydrogenase efflux was similar in MLA and vehicle pretreated hearts and there was no significant difference in the percentage of infarction of the left ventricle determined by triphenyltetrazolium staining (MLA 22.4±5.2%, vehicle 24.8±5.1%). 4 When 30 min regional ischaemia and 120 min reperfusion was instituted in pentobarbitone-anaesthetized rabbits 24 h after pretreatment with MLA or vehicle, the percentage infarction within the risk zone was reduced from 42.6±5.7% in vehicle pretreated animals to 19.6±4.4% in MLA pretreated animals (P<0.01). 4 Determination of myocardial HSP70i content by Western blot analysis showed that MLA treatment did not increase HSP70i immunoreactivity. 5 We conclude that MLA at this dose confers protection only against ischaemia-reperfusion injury in vivo and that this protection is not related to induction of HSP70i. Because protection was observed only in vivo it seems possible that the delayed protection conferred by MLA is mediated by effects on humoral or blood-borne factors." @default.
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- W2026496721 date "1996-04-01" @default.
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- W2026496721 title "Myocardial protection after monophosphoryl lipid A: studies of delayed anti-ischaemic properties in rabbit heart" @default.
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- W2026496721 doi "https://doi.org/10.1111/j.1476-5381.1996.tb15340.x" @default.
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