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Related Concept Videos

Overview of Exosomes01:36

Overview of Exosomes

Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
Exocytosis00:50

Exocytosis

Exocytosis is a process that releases molecules outside the cell. Like other bulk transport mechanisms, exocytosis requires energy.
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...

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Related Experiment Video

Updated: May 27, 2026

Rapid Isolation of Human Breast Milk-Derived Extracellular Vesicles
04:35

Rapid Isolation of Human Breast Milk-Derived Extracellular Vesicles

Published on: November 14, 2025

Bovine milk exosome proteome.

Timothy A Reinhardt1, John D Lippolis, Brian J Nonnecke

  • 1Ruminant Diseases and Immunology Unit, National Animal Disease Center, USDA/ARS, Ames, IA 50010, USA. tim.reinhardt@ars.usda.gov

Journal of Proteomics
|December 2, 2011
PubMed
Summary
This summary is machine-generated.

Bovine milk exosomes, tiny vesicles involved in cell communication, were analyzed. Their protein content differs significantly from milk fat globule membranes, offering new insights into mammary gland physiology.

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Area of Science:

  • Proteomics
  • Cell Biology
  • Biochemistry

Background:

  • Exosomes are nanoscale vesicles involved in intercellular communication and immune function.
  • Bovine milk contains exosomes, which are extracellular organelles secreted by cells.
  • Understanding the proteome of milk exosomes can illuminate milk production processes.

Purpose of the Study:

  • To characterize the proteome of exosomes isolated from bovine milk.
  • To compare the protein composition of milk exosomes with milk fat globule membranes (MFGM).
  • To investigate the physiological significance of milk exosomes in mammary physiology.

Main Methods:

  • Exosomes were isolated from mid-lactation cow milk.
  • Proteomic analysis involved trypsin digestion, offline high pH reverse-phase chromatography, and nanoLC-tandem mass spectrometry.
  • Protein identification and quantification were performed using mass spectrometry.

Main Results:

  • Identification of 2107 proteins in milk exosomes, including canonical exosome markers.
  • Major milk fat globule membrane (MFGM) proteins were identified but were less abundant in exosomes compared to MFGM isolates.
  • Milk exosome secretion pathway differs from MFGM, with reduced MFGM protein presence.

Conclusions:

  • The proteome of bovine milk exosomes provides novel information on milk composition.
  • The distinct protein profile suggests a different secretion pathway for exosomes compared to MFGM.
  • Milk exosomes may play a significant role in mammary gland physiology.