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High mobility group box 1 induces a negative inotropic effect on the left ventricle in an isolated rat heart model of septic shock: a pilot study.

Authors: Hagiwara, S  Iwasaka, H  Uchino, T  Noguchi, T 
Citation: Hagiwara S, etal., Circ J. 2008 Jun;72(6):1012-7.
Pubmed: (View Article at PubMed) PMID:18503231

BACKGROUND: Sepsis can be exacerbated by an inappropriate immune response and the severe impact of this disease on the cardiovascular system is well documented. High mobility group box 1 (HMGB1) protein is an important mediator in the pathogenesis of sepsis and its role in cardiovascular system dysfunction was investigated in an lipopolysaccharide (LPS)-induced rat model of sepsis. METHODS AND RESULTS: Twelve hours after intravenous bolus injections of LPS (5 mg/kg), rats were killed and heart samples were harvested. Immunoblot analysis was performed to assess expression levels of HMGB1 in cardiac myocytes. Left ventricular developed pressure (LVDP) served as a measure of systolic function. LPS administration was associated with an increase in the expression of HMGB1 in cardiac myocytes and a decrease in cardiac function. Hearts from the LPS-treated rats were also perfused with recombinant HMGB1 and cardiac function measured. The dose-dependent effects observed with elevated HMGB1 included decreased LVDP, decreased left ventricular (LV) + dP/dt(max), decreased absolute value of LV- dP/dt(min), and increased LV end-diastolic pressure. CONCLUSIONS: HMGB1 stimulation produces a negative inotropic effect during septic shock, suggesting an important role for this molecule in cardiovascular system dysfunction during sepsis.

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RGD Object Information
RGD ID: 10402065
Created: 2015-10-14
Species: All species
Last Modified: 2015-10-14
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.