Cytoskeleton

The **cytoskeleton** is a complex, dynamic network of interlinking protein filaments present in the cytoplasm of all cells, including eukaryotes, bacteria, and archaea. It is composed primarily of three main types of fibers—microfilaments (actin filaments), intermediate filaments, and microtubules—each with distinct structural proteins and functions. The cytoskeleton provides mechanical support to maintain the cell’s shape, organizes cellular components spatially, enables intracellular transport via motor proteins such as kinesins and dyneins along its tracks, facilitates chromosome segregation during mitosis through spindle formation by microtubules, supports cytokinesis via actin-myosin contractile rings, allows for specialized structures like cilia/flagella for movement or sensory roles, mediates endocytosis/exocytosis processes, anchors organelles such as the nucleus within the cell body using intermediate filaments like lamins or vimentin depending on tissue type. The structure is highly dynamic—constantly assembling/disassembling in response to cellular needs—and plays a central role in many signaling pathways[1][2][3][4][5][6]. **Note:** "Cytoskeleton" or "cellular skeleton" refers to a broad structural system rather than a single molecular target; it is not considered a therapeutic target itself but rather an essential component underlying many biological processes. Drugs may target specific components within this system (e.g., tubulin inhibitors), but not the entire cytoskeletal network as one entity[1].

Other names

Cellular skeletoncell skeleton