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Cell Migration Assays Services

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The Transwell Migration Assay is a commonly used test to study the migratory response of endothelial cells to angiogenic inducers or inhibitors. It is a highly integrated, multi-step process that orchestrates embryonic morphogenesis, tissue repair and regeneration. It plays a pivotal role in the disease progression of cancer, mental retardation, atherosclerosis and arthritis. The initial response of a cell to a migration-promoting agent is to polarize and extend protrusions in the direction of the attractant; these protrusions can consist of large, broad lamellipodia or spike-like filopodia.

cell migration assay

There are four different types of Cell Migration: migration of cells based on a chemical environment (chemotaxis); cell migration within a gradient of chemoattractants (haptotaxis); movement of cells through the vascular endothelium (transmigration) and migration of cells into a wound to close the gap (wound healing).

Most of these assays are compatible with an imaging based readout. Recent strategies have resulted in more advanced cell migration assays that are more accurate, sensitive, convenient and robust, especially in wound healing.

Chemotaxis Assays

• Quantify chemotaxis with no manual cell counting
• Measure chemotaxis in less than 6 hours with most cell types
• Uncoated membrane inserts for use with any chemoattractant

• Colorimetric or fluorometric detection

Chemotaxis describes cell migration based on chemicals in a cell’s surrounding environment. Chemotaxis can indicate cell migration either toward or away from a particular chemical signal. Cell chemotaxis plays a pivotal role in the progression of cancer and other diseases.

Haptotaxis Assays
• Quantify haptotaxis with no manual cell counting
• Measure haptotaxis in less than 6 hours with most cell types
• Collagen I- or fibronectin-coated membrane inserts

• Colorimetric or fluorometric detection

Cell haptotaxis describes cell migration toward or along a gradient of chemoattractants or adhesion sites in the extracellular matrix.

Transmigration Assays
• Quantify cell transmigration with no manual cell counting
• Determine leukocyte/tumor endothelium interactions
• Highly sensitive results on a fluorescence plate reader

Transmigration describes the migration of cells through the vascular endothelium toward a chemoattractant. The initial arrest and attachment of tumor cells to vascular endothelium precedes their extravasation from the blood stream and is a crucial step in the tumor metastatic cascade. Tumor cell extravasation is equivalent, in many respects, to the entry of leukocytes into inflammatory tissue. Leukocyte extravasation consists of multiple, consecutive processes including the capture of circulating leukocytes, subsequent leukocyte rolling, arrest, firm adhesion and transmigration.

Wound Healing Assays
• Measure cell migration, cell proliferation and wound closure
• More consistent compared to homemade scratch assays
• Inert inserts leave no residues that could impede proliferation or migration of cells

Wounded tissue initiates a complex and structured series of events in order to repair the damaged region. These events may include increased vascularization by angiogenic factors, an increase in cell proliferation and extracellular matrix deposition, and infiltration by inflammatory immune cells as part of the process to destroy necrotic tissue. The wound healing process begins as cells polarize toward the wound, initiate protrusion, migrate and close the wound area.

Traditionally scratch assays have been used to study cell migration, cell proliferation and wound healing. However, these assays lack a consistently defined wound gap and can result in high inter-sample variation.

The Role of Cell Migration in Tumor Development

Cell Migration is a hallmark in tumor development. It is relevant for angiogenesis to assure tumor nutrition as well as for the formation of metastases, in which tumor cells leave the primary tumor site and invade other tissues. The process of cell movement is induced by various agents such as growth factors and chemokines and is associated with complex signaling events which involve many components of the cellular motility machinery. Such signaling components (e.g. FAK, cSrc, ROCK) as well as ligand/receptor interactions that induce migration represent attractive targets for tumor therapy. The assay described below facilitates the identification of potential inhibitors in a 96-well format that is most comparable with the widely used scratch assay and addresses chemokinetic movement of cells.

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