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High mobility group box 1 protein, a cue for stem cell recruitment
Roberta Palumbo1, Marco E Bianchi
1Department of Molecular Biology and Functional Genomics, San Raffaele Research Institute, San Raffaele University, via Olgettina 58, 20132 Milan, Italy.
Biochemical Pharmacology
|August 18, 2004
Summary
High mobility group box 1 (HMGB1), a protein maintaining chromatin, acts as a cytokine. HMGB1 released by damaged cells signals tissue injury and recruits circulating stem cells for potential regeneration.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- High mobility group box 1 (HMGB1) is a nuclear protein crucial for chromatin structure.
- Emerging evidence highlights HMGB1's role as an extracellular cytokine.
- HMGB1 is implicated in inflammation, cell migration, and metastasis.
Purpose of the Study:
- To investigate the role of HMGB1 in stem cell recruitment.
- To explore the connection between HMGB1's inflammatory and regenerative functions.
Main Methods:
- Observational studies on HMGB1 release from damaged cells.
- In vitro experiments assessing HMGB1-induced stem cell transmigration.
- In vivo implantation of HMGB1-containing beads to assess stem cell recruitment.
Main Results:
- HMGB1 is passively released by traumatically dying cells, signaling tissue damage.
- HMGB1 facilitates stem cell transmigration across endothelial barriers.
- Implanted HMGB1 recruits circulating stem cells to muscle tissue.
Conclusions:
- HMGB1 functions as a damage signal and a stem cell chemoattractant.
- The inflammatory and tissue-regenerating roles of HMGB1 are interconnected.
- HMGB1 holds potential for therapeutic applications in tissue repair.