Describe the different cell adhesion molecules.

Cell adhesion molecules (CAMs) are proteins located on the cell surface that facilitate the binding of cells to each other and to the extracellular matrix (ECM). These molecules play essential roles in maintaining tissue structure, cellular communication, and various biological processes such as embryogenesis, wound healing, immune response, and cancer metastasis. CAMs are broadly classified into four major families: cadherins, integrins, selectins, and immunoglobulin superfamily (IgSF) members.

1. Cadherins

Cadherins are calcium-dependent adhesion molecules that mediate homophilic cell-cell adhesion, meaning they bind to the same type of cadherin on adjacent cells. They are critical for maintaining tissue integrity and are involved in processes such as embryonic development and cell signaling. Cadherins are transmembrane proteins with three main domains:

• Extracellular domain: Responsible for binding to cadherins on neighboring cells in a calcium-dependent manner.
• Transmembrane domain: Anchors the protein to the plasma membrane.
• Cytoplasmic domain: Interacts with intracellular proteins like catenins, which link cadherins to the actin cytoskeleton.
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