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Human lactoferrin induces phenotypic and functional changes in murine splenic B cells
M Zimecki1, J Mazurier, G Spik
1Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw, Poland.
Insights
Human lactoferrin promotes B cell maturation in mice, enhancing their phenotype and antigen-presenting function. This suggests lactoferrin
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Human lactoferrin (hLF) is a multifunctional protein with known immunomodulatory properties.
- B cells play a critical role in adaptive immunity, involving maturation, phenotype, and antigen presentation.
- Understanding factors influencing B cell development is crucial for immune system research.
Purpose of the Study:
- To investigate the immunotropic effects of human lactoferrin on murine splenic B cells.
- To determine if human lactoferrin induces phenotypic and functional changes in B cells.
- To assess human lactoferrin's role in B cell maturation and antigen presentation.
Main Methods:
- Murine splenic B cells were isolated using buoyant density Percoll gradients.
- Phenotypic analysis involved assessing surface immunoglobulin D (IgD) and complement receptor expression.
- Functional assessment included antigen presentation assays using T-helper type 2 (Th2) cell lines.
Main Results:
- Human lactoferrin induced phenotypic maturation in immature B cells from newborn mice, increasing IgD and complement receptor expression.
- Human lactoferrin facilitated antigen presentation by B cells from both newborn and immunodeficient adult mice.
- Minor phenotypic changes were observed in B cells from adult mice.
Conclusions:
- Human lactoferrin acts as a significant maturation factor for murine B cells.
- It enhances both the phenotype and functional capacity (antigen presentation) of B cells.
- These findings highlight a novel role for lactoferrin in immune system development and function.
Abstract:
The immunotropic activities of human lactoferrin were studied with respect to phenotypic and functional changes in murine splenic B cells. Phenotypic changes were induced by human lactoferrin in splenic B-cell fractions separated by buoyant density. B cells from 7-8-day-old BALB/c mice isolated from a 50/60% Percoll gradient, gained characteristic features of more mature B cells manifested by an increase of surface IgD and complement receptor expression. Incubation of the analogous B-cell fraction from adult mice with human lactoferrin resulted in minor changes in relation to IgM and IgD expression. Besides induction of phenotypic changes on immature B cells, human lactoferrin enabled B cells from normal newborn and adult immunodeficient CBA/N mice to present antigen to an antigen-specific T-helper type 2 (Th2) cell line. We conclude that human lactoferrin acts as a maturation factor for B cells with regard to their phenotype and function.