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Cytokines in human milk

M D Srivastava1, A Srivastava, B Brouhard

  • 1Department of Pediatrics, Cleveland Clinic Foundation, OH 44195, USA.

Research Communications in Molecular Pathology and Pharmacology
|September 1, 1996
PubMed
Summary

Breastfeeding provides significant health benefits for infants, including enhanced host defense and digestive development. This study quantifies cytokines in human milk, revealing key protective factors like M-CSF, TGF-beta, IL-1RA, and chemokines that support infant immunity.

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Area of Science:

  • Immunology
  • Human Lactation
  • Pediatric Health

Background:

  • Breastfeeding is crucial for infant health, impacting host defense, autoimmunity prevention, and digestive system development.
  • The precise immunological mechanisms underlying these benefits, particularly the role of cytokines in human milk, remain incompletely understood.
  • Previous research suggests cytokines play a role, but comprehensive analysis across lactation stages and milk types is needed.

Purpose of the Study:

  • To quantitatively analyze the presence and levels of various cytokines in human colostrum, transitional, and mature milk.
  • To investigate the production of cytokine messenger RNA (mRNA) by maternal cells within breast milk.
  • To explore the potential role of these cytokines and cytokine-producing cells in conferring immunological benefits to breastfed infants.

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Main Methods:

  • Enzyme-Linked Immunosorbent Assay (ELISA) was employed to quantify cytokine concentrations in human milk samples.
  • Reverse Transcription Polymerase Chain Reaction (RT-PCR) was utilized to detect cytokine mRNA expression in breast milk cells.
  • Samples were collected from mothers delivering preterm and at term, spanning different lactation stages.

Main Results:

  • High levels of Macrophage Colony-Stimulating Factor (M-CSF), latent Transforming Growth Factor-beta (TGF-beta 1 and TGF-beta 2), Interleukin-1 Receptor Antagonist (IL-1RA), and specific chemokines (GRO-alpha, MCP-1, RANTES, IL-8) were detected.
  • Maternal milk cells demonstrated mRNA expression for several cytokines, including MCP-1, IL-8, TGF-beta 1, M-CSF, IL-6, and IL-1 beta, suggesting they are a source of these factors.
  • Cytokine levels showed variability between individuals and between preterm and term mothers, with some levels remaining elevated long into lactation.

Conclusions:

  • Human milk contains significant levels of specific cytokines and chemokines that likely contribute to host defense and prevention of autoimmunity in infants.
  • Maternal cells within breast milk are a potential source of these immunomodulatory cytokines.
  • The presence of these factors throughout lactation highlights the sustained immunological support provided by breastfeeding.