Related Experiment Videos
Isolation of interleukin-1 from human milk
International Archives of Allergy and Applied Immunology
|January 1, 1987
Summary
Human milk contains interleukin-1 (IL-1), a lymphocyte growth factor. This immune factor exhibits species-independent mitogenic effects and may play a role in infant immunity and milk
Area of Science:
- Immunology
- Biochemistry
- Human Milk Research
Background:
- Lymphocyte growth factors are crucial for immune responses.
- The presence and function of such factors in human milk are not fully understood.
- Interleukin-1 (IL-1) is a key cytokine involved in immune regulation.
Purpose of the Study:
- To investigate the presence of lymphocyte growth factors in mature human milk.
- To characterize the molecular properties of any identified growth factors.
- To explore the potential physiological roles of milk-derived immune factors.
Main Methods:
- Protein precipitation and dialysis of mature human milk.
- Murine thymocyte proliferation assay to detect IL-1 activity.
- Species-specific thymocyte cultures (human and guinea pig) to assess mitogenic effects.
- Gel filtration chromatography (Sephadex G 150) and chromatofocusing for molecular characterization.
Main Results:
- Human milk proteins demonstrated significant interleukin-1 (IL-1) activity.
- The mitogenic effect of milk protein was observed in both human and guinea pig thymocytes.
- IL-1 activity exhibited molecular heterogeneity, with peaks at 14, 31, and 60 kDa, and an isoelectric point of 5.0.
Conclusions:
- Mature human milk contains biologically active interleukin-1 (IL-1).
- Milk-derived IL-1 possesses species-independent mitogenic properties.
- Potential roles include immunostimulation in the mammary gland and infant, and contribution to milk's pyrogenic activity.