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Transforming growth factor-beta (TGF-beta) in human milk
1Department of Obstetrics and Gynaecology, Nara Medical University, Japan.
Clinical and Experimental Immunology
|October 1, 1993
Summary
Human milk contains transforming growth factor-beta (TGF-beta), a crucial protein. This study confirms its presence and active forms in both colostrum and mature milk, vital for infant development.
Area of Science:
- Immunology
- Biochemistry
- Human Physiology
Background:
- Transforming growth factor-beta (TGF-beta) is a critical cytokine involved in immune regulation and tissue development.
- Human milk is recognized as a vital source of bioactive molecules for infant nutrition and development.
Purpose of the Study:
- To quantify the levels of TGF-beta in human whey.
- To determine the presence of active and total TGF-beta in colostrum and mature human milk.
- To investigate the expression of TGF-beta mRNA in human milk cells.
Main Methods:
- Cell-based assay using NRK47F cells to detect colony-forming activity induced by human whey.
- Neutralization assay with anti-TGF-beta antibodies.
- Quantification of total and active TGF-beta using enzyme-linked immunosorbent assay (ELISA) or similar methods.
- Reverse transcriptase polymerase chain reaction (RT-PCR) to detect TGF-beta mRNA.
Main Results:
- A factor inducing colony formation was identified in human whey, neutralized by anti-TGF-beta antibodies, confirming TGF-beta presence.
- Colostrum contained 1365.7 ng/ml total TGF-beta (728.1 ng/ml active).
- Late milk contained 952.5 ng/ml total TGF-beta (178.7 ng/ml active).
- RT-PCR detected TGF-beta 1 and TGF-beta 2 mRNA in human milk cells.
Conclusions:
- Human whey and milk contain significant amounts of TGF-beta, including active forms.
- Both TGF-beta 1 and TGF-beta 2 are present in human milk, with their respective mRNAs found in milk cells.
- These findings highlight the importance of TGF-beta in human milk for infant health.