Apoptosis, also known as programmed cell death, is a process that occurs in multicellular organisms. Biochemical events lead to characteristic cell changes and death. These changes include blebbing, cell shrinkage, nuclear fragmentation, chromatin condensation, chromosomal DNA fragmentation, and global mRNA decay.

The extracellular messengers of apoptosis are often signaling molecules and ligands that bind to cell surface receptors and trigger the internal apoptotic machinery of the cell. These can include:

1. Fas Ligand (FasL): This is a type-II transmembrane protein that belongs to the tumor necrosis factor (TNF) family. Its binding with its receptor induces apoptosis.

2. Tumor Necrosis Factor (TNF): TNF is a cytokine involved in systemic inflammation and is a member of a group of cytokines that stimulate the acute phase reaction. It is produced chiefly by activated macrophages, although it can be produced by many other cell types.

3. TRAIL (TNF-related apoptosis-inducing ligand): This is a protein that functions as a ligand that induces the process of cell death called apoptosis.

4. TGF-beta (Transforming Growth Factor-beta): This is a secreted protein that performs many cellular functions, including the control of cell growth, cell proliferation, cell differentiation, and apoptosis.

5. Cytokines such as Interleukin-2 (IL-2): These are a broad and loose category of small proteins that are important in cell signaling. Their role in the immune system is crucial, and they modulate the balance between humoral and cell-based immune responses.

These extracellular messengers bind to specific receptors on the cell surface, triggering a cascade of intracellular events leading to apoptosis.

Question

Apoptosis, also known as programmed cell death, is a process that occurs in multicellular organisms. Biochemical events lead to characteristic cell changes and death. These changes include blebbing, cell shrinkage, nuclear fragmentation, chromatin condensation, chromosomal DNA fragmentation, and global mRNA decay.

The extracellular messengers of apoptosis are often signaling molecules and ligands that bind to cell surface receptors and trigger the internal apoptotic machinery of the cell. These can include:

1. Fas Ligand (FasL): This is a type-II transmembrane protein that belongs to the tumor necrosis factor (TNF) family. Its binding with its receptor induces apoptosis.

2. Tumor Necrosis Factor (TNF): TNF is a cytokine involved in systemic inflammation and is a member of a group of cytokines that stimulate the acute phase reaction. It is produced chiefly by activated macrophages, although it can be produced by many other cell types.

3. TRAIL (TNF-related apoptosis-inducing ligand): This is a protein that functions as a ligand that induces the process of cell death called apoptosis.

4. TGF-beta (Transforming Growth Factor-beta): This is a secreted protein that performs many cellular functions, including the control of cell growth, cell proliferation, cell differentiation, and apoptosis.

5. Cytokines such as Interleukin-2 (IL-2): These are a broad and loose category of small proteins that are important in cell signaling. Their role in the immune system is crucial, and they modulate the balance between humoral and cell-based immune responses.

These extracellular messengers bind to specific receptors on the cell surface, triggering a cascade of intracellular events leading to apoptosis.

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