Definition

1. Noun:
   • A biological process of controlled cellular self-destruction: "Programmed cell death" refers to a genetically regulated, deliberate process by which a cell activates an internal mechanism to cause its own orderly death. It is a crucial mechanism for development, tissue homeostasis, and defense.

Usage

• The term "programmed cell death" is used primarily in biological and medical contexts to describe a fundamental, intentional cellular process. It is a formal, scientific term.
• It is often discussed in contrast to accidental cell death (necrosis), which results from acute injury.
• Common contexts include developmental biology, cancer research, immunology, and neurology.

Examples

• Noun:
  • During embryonic development, programmed cell death shapes structures like fingers and toes by removing the webbing between them.
  • The failure of programmed cell death is a hallmark of cancer, allowing damaged cells to survive and proliferate.
  • Researchers are studying the signaling pathways that initiate programmed cell death.

Advanced Usage

• "to undergo programmed cell death": The standard phrase describing a cell entering this process.
  • Cells infected by the virus were triggered to undergo programmed cell death.
• The term is often used interchangeably with its most common specific form, apoptosis, though apoptosis is one type of programmed cell death.

Variants and Related Words

• Apoptosis (n): The most well-studied and common form of programmed cell death, characterized by specific morphological changes like cell shrinkage and nuclear fragmentation.
  • Apoptosis is a classic example of programmed cell death.
• Autophagy (n): A related cellular process involving the degradation of a cell's own components; it can sometimes lead to a form of programmed cell death.
• Necroptosis (n): A regulated form of inflammatory cell death, distinct from apoptosis.

Synonyms

• Cell suicide: A more informal, descriptive synonym.
• Apoptosis (in many, but not all, contexts).

Related Phrases

• Induction of programmed cell death: The act of triggering this process.
  • The therapy works by the induction of programmed cell death in tumor cells.
• Dysregulation of programmed cell death: When the control of this process is faulty.
  • Dysregulation of programmed cell death is involved in many diseases.

Related Concepts

• Homeostasis: The maintenance of a stable internal environment; programmed cell death is a key mechanism for cellular homeostasis.
• Caspases: A family of protease enzymes that play essential roles in executing apoptosis.
• Death receptor: A type of receptor on the cell surface that can transmit signals to initiate programmed cell death.

Noun

1. a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival