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Interleukin 8 in the human colostrum
Shintaro Hashira1, Shoko Okitsu-Negishi, Kazuya Yoshino
1Department of Pediatrics, Teikyo University School of Medicine, Tokyo, Japan. hashira@med.teikyo-u.ac.jp
Biology of the Neonate
|July 18, 2002
Summary
Colostral interleukin-8 (IL-8) levels are highest on day 1 postpartum and rapidly decrease. Colostral cells produce IL-8, contributing to its presence in early breast milk.
Area of Science:
- Immunology
- Neonatal Health
- Lactation Biology
Background:
- Interleukin-8 (IL-8) is a key cytokine involved in immune responses.
- Colostrum, the first milk produced after childbirth, contains immune factors crucial for infant development.
- Understanding IL-8 dynamics in colostrum is important for neonatal immunity.
Purpose of the Study:
- To investigate changes in colostral IL-8 concentrations during the first three days postpartum.
- To examine the production of IL-8 by colostral cells at both protein and mRNA levels.
Main Methods:
- Colostrum samples were collected from healthy mothers postpartum.
- Interleukin-8 (IL-8) concentrations were measured using enzyme-linked immunosorbent assay (ELISA).
- IL-8 mRNA expression in colostral cells was analyzed via reverse-transcription polymerase chain reaction (RT-PCR).
Main Results:
- Colostral IL-8 concentrations significantly decreased from day 1 to day 3 postpartum.
- Colostral cells demonstrated in vitro production and secretion of IL-8, even without stimulation.
- The majority of uncultured colostral cells expressed IL-8 mRNA.
Conclusions:
- Colostral IL-8 levels exhibit a rapid decline in the early postpartum period.
- Colostral cells are a significant source of IL-8 in colostrum.
- These findings highlight the role of colostral cells in providing IL-8 for neonatal immune defense.