Colostrum-Derived Melatonin Plus PEG Microspheres Modulate the Oxidative Metabolism of Human Colostrum Phagocytes

Area of Science:

• Immunology
• Biochemistry
• Nanotechnology

Background:

• Exogenous melatonin on PEG microspheres modulates phagocyte function.
• Limited data exist on the activity of endogenous melatonin in colostrum.

Purpose of the Study:

• Extract melatonin from human colostrum.
• Develop and characterize PEG microspheres with adsorbed colostrum melatonin.
• Evaluate the impact of this system on colostrum phagocyte oxidative metabolism.

Main Methods:

• Melatonin extraction from colostrum via affinity chromatography and ELISA quantification.
• Characterization of PEG microspheres using fluorescence microscopy and flow cytometry.
• Assessment of phagocyte oxidative metabolism by measuring superoxide anion and enzyme release.

Main Results:

• PEG microspheres successfully adsorbed melatonin.
• Both colostrum-derived and synthetic melatonin increased phagocyte superoxide release.
• Colostrum melatonin on PEG microspheres enhanced superoxide release while decreasing superoxide dismutase (SOD) release, leading to a lower SOD-to-superoxide ratio.
• Synthetic melatonin reduced superoxide release and increased SOD release and the SOD-to-superoxide ratio.

Conclusions:

• Colostrum-derived melatonin is crucial for cellular metabolism.
• Colostrum melatonin adsorbed onto PEG microspheres may offer superior control over oxidative metabolism during infections compared to synthetic melatonin.