In addition to breaking down polymers, lysosomes are capable of killing and digesting microbes, cells, or cellular debris. Through cooperation with phagosomes, lysosomes conduct autophagy, clearing out damaged structures and forming simple compounds, which are then used as new building materials.
Lysosomes are membrane-bound organelles that contain digestive enzymes for breaking down macromolecules, cellular debris, and foreign invaders. They occur in most animal cells, but are generally absent in mature mammalian red blood cells and rare in plant cells.
Lysosomes originate by budding off from the membrane of the trans-Golgi network, a region of the Golgi complex responsible for sorting newly synthesized proteins, which may be designated for use in lysosomes, endosomes, or the plasma membrane.
Lysosomes are membrane-bound, dense granular structures containing hydrolytic enzymes responsible mainly for intracellular and extracellular digestion.
Lysosomes are involved with various cell processes. They break down excess or worn-out cell parts. They may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis.
Abstract Lysosomes are the main proteolytic compartments of mammalian cells comprising of a battery of hydrolases. Lysosomes dispose and recycle extracellular or intracellular macromolecules by fusing with endosomes or autophagosomes through specific waste clearance processes such as chaperone-mediated autophagy or microautophagy.
The metabolite recycling, transporting, and sensing activities of lysosomes are shared by virtually all cell types in the body. However, lysosomes also acquire new functions that serve the unique needs of the organs and tissues they inhabit. A prominent example is the immune system.
Lysosome: Structure and Function ... Structure of Lysosome ... Lysosomal membrane ... Types of lysosomes ... Functions of Lysosomes