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Lactoferrin: molecular structure and biological function

B Lönnerdal1, S Iyer

  • 1Department of Nutrition, University of California, Davis 95616, USA.

Annual Review of Nutrition
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

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Lactoferrin, an iron-binding glycoprotein found in milk and bodily fluids, is explored for its roles in iron absorption, immune response, and bacterial growth inhibition. This review details its functions beyond iron binding, including potential growth factor and bactericidal activities.

Area of Science:

  • Biochemistry
  • Immunology
  • Microbiology

Background:

  • Lactoferrin is an 80-kDa iron-binding glycoprotein found in human and bovine milk, as well as exocrine fluids like bile and tears.
  • It is a single-chain polypeptide, resistant to proteolysis, with reported cDNAs from human and bovine sources, enabling recombinant protein production.

Purpose of the Study:

  • To evaluate the proposed functions of lactoferrin, focusing on its biological significance.
  • To investigate lactoferrin's roles beyond iron-binding, such as its potential as a growth factor and bactericidal agent.

Main Methods:

  • Review of existing literature on lactoferrin's properties and functions.
  • Analysis of studies investigating lactoferrin's iron-binding capabilities and their implications.
  • Examination of research exploring non-iron-binding related activities of lactoferrin.

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Main Results:

  • Lactoferrin's iron-binding properties suggest roles in intestinal iron uptake and bacteriostasis by sequestering iron.
  • Its presence in neutrophils and release during inflammation indicate involvement in phagocytic killing and immune responses.
  • Emerging evidence suggests lactoferrin may also act as a growth factor and possess direct bactericidal properties.

Conclusions:

  • Lactoferrin exhibits diverse biological functions, including iron homeostasis, immune modulation, and antimicrobial activity.
  • Further research is warranted to fully elucidate the mechanisms and significance of lactoferrin's non-iron-binding functions.
  • Lactoferrin represents a multifaceted protein with considerable therapeutic and biological potential.