Definition

Noun: A liposome is an artificially created, microscopic spherical vesicle (a small, fluid-filled sac) composed of one or more phospholipid bilayers, similar to the structure of a cell membrane. Its primary function is to encapsulate and deliver substances, such as nucleic acids or drugs, into cells, making it a crucial tool in molecular biology and medicine as a delivery vector.

Usage

Liposomes are used as carriers or vectors to transport therapeutic or research materials into cells. * In molecular biology, a liposome can be used to introduce DNA into a cell. * The drug was encapsulated within a liposome to improve its delivery to the target tissue.

Examples

• Noun:
  • The researchers designed a liposome to deliver the mRNA vaccine directly to immune cells.
  • Gene therapy often relies on a liposome to protect and transport genetic material.

Advanced Usage

• Stealth Liposome: A liposome coated with polymers (like polyethylene glycol) to evade the immune system and circulate longer in the bloodstream.
  • Stealth liposomes are engineered for prolonged drug release.
• Cationic Liposome: A liposome with a positive surface charge, which enhances its ability to bind and compact negatively charged nucleic acids like DNA or RNA.
  • Cationic liposomes are effective transducing vectors for gene delivery.

Variants and Related Words

• Liposomal (adj): Relating to or using liposomes.
  • The liposomal formulation of the drug reduces side effects.
• Niosome: A similar vesicular drug delivery system made from non-ionic surfactants instead of phospholipids.
• Vesicle: A general term for a small, membrane-bound sac within a cell or created artificially.

Synonyms

• Nanovesicle (in a broader, less specific context)
• Delivery vector
• Carrier system

Related Phrases

• Liposome-mediated delivery: The process of using liposomes to transport substances into cells.
  • Liposome-mediated delivery is a standard technique in our lab.
• Liposome encapsulation: The act of enclosing a substance within a liposome.
  • The success of the therapy depends on efficient liposome encapsulation of the active compound.

Notes

The term "liposome" is specific to its artificial, laboratory-created nature and its defining bilayer structure. It is a key concept in biotechnology, pharmacology, and molecular biology for targeted delivery applications.

Noun

1. an artificially made microscopic vesicle into which nucleic acids can be packaged; used in molecular biology as a transducing vector