Amoeboid movement

• 
  Amoeboid movement
• 
  Types of amoeboid movement
• Collective mechanism of cell motion
  Collective mechanism of cell motion

Amoeboid Movement

Amoeboid movement is a type of cell motility characterized by the flowing motion of the cell's cytoplasm, allowing the cell to move and change shape. This form of movement is typical of amoebae, but it is also observed in other cell types, such as white blood cells in humans.

Mechanism

Amoeboid movement is primarily driven by the cytoskeleton, a network of protein filaments within the cell. The key components involved in this process are actin filaments and myosin motors. The movement can be described in several stages:

Protrusion

The cell extends a part of its membrane forward, forming a structure known as a pseudopod. This is achieved by the polymerization of actin filaments at the leading edge of the cell, pushing the membrane outward.

Adhesion

The pseudopod attaches to the substrate, providing a stable anchor point. This adhesion is mediated by cell surface proteins that interact with the extracellular matrix or other surfaces.

Traction

Once the pseudopod is anchored, the cell body is pulled forward. This is facilitated by the contraction of actin and myosin filaments, which generate the force needed to move the cell.

Detachment

Finally, the rear of the cell detaches from the substrate, allowing the cell to move forward. This detachment is regulated by the disassembly of adhesion sites and the depolymerization of actin filaments at the trailing edge.

Biological Significance

Amoeboid movement is crucial for various biological processes. In unicellular organisms like amoebae, it is essential for locomotion and feeding. In multicellular organisms, amoeboid movement plays a vital role in the immune response, allowing white blood cells to migrate towards sites of infection or inflammation. It is also involved in embryonic development and tissue repair.

Related Pages

• Cytoskeleton
• Cell motility
• Pseudopod
• Actin
• Myosin
• White blood cell

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