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Transcriptional profiling of HMGB1-induced myocardial repair identifies a key role for Notch signaling. | LitMetric

AI Article Synopsis

Article Abstract

Exogenous high-mobility group box 1 protein (HMGB1) administration to the mouse heart, during acute myocardial infarction (MI), results in cardiac regeneration via resident c-kit(+) cell (CPC) activation. Aim of the present study was to identify the molecular pathways involved in HMGB1-induced heart repair. Gene expression profiling was performed to identify differentially expressed genes in the infarcted and bordering regions of untreated and HMGB1-treated mouse hearts, 3 days after MI. Functional categorization of the transcripts, accomplished using Ingenuity Pathway Analysis software (IPA), revealed that genes involved in tissue regeneration, that is, cardiogenesis, vasculogenesis and angiogenesis, were present both in the infarcted area and in the peri-infarct zone; HMGB1 treatment further increased the expression of these genes. IPA revealed the involvement of Notch signaling pathways in HMGB1-treated hearts. Importantly, HMGB1 determined a 35 and 58% increase in cardiomyocytes and CPCs expressing Notch intracellular cytoplasmic domain, respectively. Further, Notch inhibition by systemic treatment with the γ-secretase inhibitor DAPT, which blocked the proteolytic activation of Notch receptors, reduced the number of CPCs, their proliferative fraction, and cardiomyogenic differentiation in HMGB1-treated infarcted hearts. The present study gives insight into the molecular processes involved in HMGB1-mediated cardiac regeneration and indicates Notch signaling as a key player.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3808142PMC
http://dx.doi.org/10.1038/mt.2013.137DOI Listing

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