Endogenous human milk peptide release is greater after preterm birth than term birth

David C. Dallas, Christina J. Smink, Randall C. Robinson, Tian Tian, Andres Guerrero, Evan A. Parker, Jennifer T. Smilowitz, Kasper A. Hettinga, Mark Underwood, Carlito B Lebrilla, J. Bruce German, Daniela Barile

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Background: Hundreds of naturally occurring milk peptides are present in term human milk. Preterm milk is produced before complete maturation of the mammary gland, which could change milk synthesis and secretion processes within the mammary gland, leading to differences in protein expression and enzymatic activity, thereby resulting in an altered peptide profile. Objective: This study examined differences in peptides present between milk from women delivering at term and women delivering prematurely. Methods: Nano-LC tandem mass spectrometry was employed to identify naturally occurring peptides and compare their abundances between term and preterm human milk samples at multiple time points over lactation. Term milk samples were collected from 8 mothers and preterm milk was collected from 14 mothers. The 28 preterm and 32 term human milk samples were divided into 4 groups based on day of collection (<14, 14-28, 29-41, and 42-58 d). Results: Preterm milk peptide counts, ion abundance, and concentration were significantly higher in preterm milk than term milk. Bioinformatic analysis of the cleavage sites for peptides identified suggested that plasmin was more active in preterm milk than term milk and that cytosol aminopeptidase and carboxypeptidase B2 likely contribute to extensive milk protein breakdown. Many identified milk peptides in both term and preterm milk overlapped with known functional peptides, including antihypertensive, antimicrobial, and immunomodulatory peptides. Conclusion: The high protein degradation by endogenous proteases in preterm milk might attenuate problems because of the preterm infant's immature digestive system. This trial was registered at clinicaltrials.gov as NCT01817127.

Original languageEnglish (US)
Pages (from-to)425-433
Number of pages9
JournalJournal of Nutrition
Volume145
Issue number3
DOIs
StatePublished - 2015

Fingerprint

Term Birth
Premature Birth
Human Milk
Milk
Peptides
Human Mammary Glands
Carboxypeptidase B2
Mothers
Leucyl Aminopeptidase
Digestive System
Milk Proteins
Secretory Pathway
Fibrinolysin
Tandem Mass Spectrometry
Computational Biology
Lactation

Keywords

  • Carboxypeptidase B2
  • Cytosol aminopeptidase
  • Functional peptide
  • Human milk
  • Mass spectrometry
  • Peptidomics
  • Plasmin
  • Premature
  • Term

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

Cite this

Dallas, D. C., Smink, C. J., Robinson, R. C., Tian, T., Guerrero, A., Parker, E. A., ... Barile, D. (2015). Endogenous human milk peptide release is greater after preterm birth than term birth. Journal of Nutrition, 145(3), 425-433. https://doi.org/10.3945/jn.114.203646

Endogenous human milk peptide release is greater after preterm birth than term birth. / Dallas, David C.; Smink, Christina J.; Robinson, Randall C.; Tian, Tian; Guerrero, Andres; Parker, Evan A.; Smilowitz, Jennifer T.; Hettinga, Kasper A.; Underwood, Mark; Lebrilla, Carlito B; Bruce German, J.; Barile, Daniela.

In: Journal of Nutrition, Vol. 145, No. 3, 2015, p. 425-433.

Research output: Contribution to journalArticle

Dallas, DC, Smink, CJ, Robinson, RC, Tian, T, Guerrero, A, Parker, EA, Smilowitz, JT, Hettinga, KA, Underwood, M, Lebrilla, CB, Bruce German, J & Barile, D 2015, 'Endogenous human milk peptide release is greater after preterm birth than term birth', Journal of Nutrition, vol. 145, no. 3, pp. 425-433. https://doi.org/10.3945/jn.114.203646
Dallas DC, Smink CJ, Robinson RC, Tian T, Guerrero A, Parker EA et al. Endogenous human milk peptide release is greater after preterm birth than term birth. Journal of Nutrition. 2015;145(3):425-433. https://doi.org/10.3945/jn.114.203646
Dallas, David C. ; Smink, Christina J. ; Robinson, Randall C. ; Tian, Tian ; Guerrero, Andres ; Parker, Evan A. ; Smilowitz, Jennifer T. ; Hettinga, Kasper A. ; Underwood, Mark ; Lebrilla, Carlito B ; Bruce German, J. ; Barile, Daniela. / Endogenous human milk peptide release is greater after preterm birth than term birth. In: Journal of Nutrition. 2015 ; Vol. 145, No. 3. pp. 425-433.
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AU - Parker, Evan A.

AU - Smilowitz, Jennifer T.

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