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Assessment of megakaryocyte migration and chemotaxis
1Centre for Cardiovascular Sciences, Institute of Biomedical Research, School of Clinical and Experimental Medicine, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK. a.mazharian@bham.ac.uk
Abstract:
Cell migration is a highly integrated multistep process that plays an essential role during development and disease. Megakaryocytes (MKs) are specialized precursor cells that produce platelets and release them into the circulation. MK migration from the proliferative osteoblastic niche within the bone marrow (BM) environment to the capillary-rich vascular niche is an essential step for platelet production. Among the chemokines that may play a central role in cell migration, the stromal cell-derived factor 1α (SDF1α) also known as CXCL12 has been described to act as a potent chemoattractant for MKs. This biological effect is mediated by the SDF1α receptor CXCR4 (Fusin), which is expressed on haematopoietic stem cells, MKs and platelets. The Dunn chemotaxis chamber in conjunction with the time-lapse microscopy is a powerful tool that enables the user to observe directly the morphological response of cells to chemoattractant in real time. This chapter describes the Dunn chemotaxis chamber to study the migration of primary BM-derived MKs in response to a gradient of SDF1α. In combination with genetically modified mice, this provides a powerful approach to directly investigate the role of specific proteins in MK migration and chemotaxis.
Insights
Stromal cell-derived factor 1α (SDF1α) attracts megakaryocytes (MKs) to the vascular niche for platelet production. The Dunn chemotaxis chamber visualizes this essential cell migration process in real time.
Area of Science:
- Cell Biology
- Hematology
- Developmental Biology
Background:
- Cell migration is crucial for development and disease, involving complex multistep processes.
- Megakaryocytes (MKs) are platelet precursors migrating from bone marrow niches to vascular spaces for platelet release.
- Stromal cell-derived factor 1α (SDF1α/CXCL12) is a key chemoattractant for MKs, binding to the CXCR4 receptor.
Purpose of the Study:
- To describe the Dunn chemotaxis chamber method for studying primary bone marrow-derived MK migration.
- To investigate the role of SDF1α in directing MK migration towards the vascular niche.
- To establish a method for real-time observation of MK chemotaxis and morphological responses.
Main Methods:
- Utilizing the Dunn chemotaxis chamber and time-lapse microscopy for real-time observation.
- Applying a gradient of SDF1α (CXCL12) as a chemoattractant.
- Employing genetically modified mice to investigate specific protein functions in MK migration.
Main Results:
- The Dunn chamber effectively visualizes the morphological response of MKs to SDF1α gradients.
- Demonstrates SDF1α as a potent chemoattractant guiding MKs.
- Provides a platform for dissecting molecular mechanisms of MK chemotaxis.
Conclusions:
- The Dunn chemotaxis chamber is a powerful tool for studying MK migration in response to chemokines like SDF1α.
- This method, combined with genetic models, allows detailed investigation of protein roles in MK chemotaxis.
- Understanding MK migration is vital for platelet production and related pathologies.
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