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Integrin-dependent human macrophage migration induced by oscillatory electrical stimulation.
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Brigham and Women's Hospital, Boston, MA 02115, USA. michael_cho@hms.harvard.edu
Annals of Biomedical Engineering
|April 28, 2000
Summary
Oscillatory electric fields stimulate macrophage migration, a key process in wound healing. This research reveals electric fields promote cell movement through integrin-dependent pathways and distinct cellular mechanisms.
Area of Science:
- Cell Biology
- Biophysics
- Wound Healing Research
Background:
- Electrical stimulation is recognized for its potential to accelerate wound healing.
- The precise biological mechanisms underlying electrical stimulation's pro-healing effects remain largely uncharacterized.
- Macrophage migration to wound sites is a critical early step in the healing cascade.
Purpose of the Study:
- To investigate the potential of oscillatory electric fields to induce and modulate human macrophage migration.
- To elucidate the cellular mechanisms and signaling pathways involved in electric field-induced macrophage movement.
- To explore how substrate composition influences electric field-mediated macrophage migration.
Main Methods:
- Human macrophages were exposed to controlled oscillatory electric fields (1 Hz, 2 V/cm).
- Cell migration velocity and random motility were quantified on glass, laminin, and fibronectin substrates.
- Microfilament organization, podosome formation, and the role of beta2-integrins were assessed using microscopy and antibody treatments.
Main Results:
- Oscillatory electric fields significantly induced human macrophage migration on glass substrates.
- Electric field exposure led to microfilament reorganization and podosome formation, indicative of cell crawling.
- Integrin-dependent pathways were implicated, as anti-beta2-integrin antibodies blocked migration.
- On laminin/fibronectin, electric fields promoted migration without podosome formation, suggesting alternative movement mechanisms like cell rolling.
Conclusions:
- Oscillatory electric fields are capable of inducing human macrophage migration.
- The cellular mechanisms of electric field-induced migration are substrate-dependent, involving cell crawling on glass and potentially other modes on extracellular matrix proteins.
- Integrin signaling plays a crucial role in electric field-mediated macrophage migration, highlighting a potential therapeutic target for enhancing wound healing.