Enhanced levels of immunoreactive beta-casomorphin-8 in milk of breastfeeding women with mastitis

Research output: Contribution to journalArticle

Abstract

An incorrect, superficial suckling technique in breastfeeding frequently leads to milk congestion and sometimes mastitis. In the present study we have examined whether milk congestion may affect levels of the atypical opioid beta-casomorphin-8 in milk and in plasma. We also investigated whether the rate of acute psychosis during the first half year after parturition has declined in Sweden over the years. Milk and plasma samples were collected for peptide analysis from 14 women with mastitis and 10 controls. We found that in a group of 14 late cases of mastitis (median 48 days post partum) the detected mean level of beta-casomorphin-8 in milk was significantly higher and somewhat higher in plasma at the acute stage compared with 2-3 weeks later, after recovery when the symptoms had disappeared, as well as compared to the control subjects. Swedish official statistics show that the incidence of acute psychosis in the first month and in the first half year after birth has declined by a half during the last 30 years. A relationship between postpartum psychosis and elevated beta-casomorphin-8 levels in CSF has been suggested from earlier studies. In this study, milk congestion led to enhanced levels of beta-casomorphin-8 in milk, which may be related to postpartum psychosis and probably also to the postnatal blues'. (C) 2013 Elsevier Inc. All rights reserved.

Details

Authors
  • Lennart Righard
  • Anna Carlsson-Jonsson
  • Fred Nyberg
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Pediatrics

Keywords

  • Atypical opioids, beta-Casomorphins, Lactation, Radioimmunoassay, Mastitis, Postpartum psychosis
Original languageEnglish
Pages (from-to)54-58
JournalPeptides
Volume51
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes