Extracellular HMGB1, a signal of tissue damage, induces mesoangioblast migration and proliferation

Roberta Palumbo, Maurilio Sampaolesi, Francesco De Marchis, Rossana Tonlorenzi, Sara Colombetti, Anna Mondino, Giulio Cossu, Marco E. Bianchi

Research output: Contribution to journalArticlepeer-review

Abstract

High mobility group box 1 (HMGB1) is an abundant chromatin protein that acts as a cytokine when released in the extracellular milieu by necrotic and inflammatory cells. Here, we show that extracellular HMGB1 and its receptor for advanced glycation end products (RAGE) induce both migration and proliferation of vessel-associated stem cells (mesoangioblasts), and thus may play a role in muscle tissue regeneration. In vitro, HMGB1 induces migration and proliferation of both adult and embryonic mesoangioblasts, and disrupts the barrier function of endothelial monolayers. In living mice, mesoangioblasts injected into the femoral artery migrate close to HMGB1-loaded heparin-Sepharose beads implanted in healthy muscle, but are unresponsive to control beads. Interestingly, α-sarcoglycan null dystrophic muscle contains elevated levels of HMGB1; however, mesoangioblasts migrate into dystrophic muscle even if their RAGE receptor is disabled. This implies that the HMGB1-RAGE interaction is sufficient, but not necessary, for mesoangioblast homing; a different pathway might coexist. Although the role of endogenous HMGB1 in the reconstruction of dystrophic muscle remains to be clarified, injected HMGB1 may be used to promote tissue regeneration.

Original languageEnglish
Pages (from-to)441-449
Number of pages9
JournalJournal of Cell Biology
Volume164
Issue number3
DOIs
Publication statusPublished - Feb 2 2004

Keywords

  • Cell migration
  • Cytokine
  • Inflammation
  • Stem cell
  • Tissue damage

ASJC Scopus subject areas

  • Cell Biology

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