PMID: 9420625Jan 8, 1998Paper

Activated human gamma delta T lymphocytes express functional lactoferrin receptors

Scandinavian Journal of Immunology
L Mincheva-NilssonM L Hammarström

Abstract

Lactoferrin (Lf), an iron-binding protein in milk, mucosal secretions and neutrophil granules has bactericidal properties and is a source of iron for breast-fed infants. In this paper the authors show that most in vivo activated lymphocytes, i.e. freshly isolated lymphocytes from first trimester human decidua, and most in vitro activated human blood lymphocytes, express lactoferrin receptors (Lf-R), while unstimulated blood lymphocytes do not. All major lymphocyte subsets, i.e. alpha beta T cells, gamma delta T cells, CD8+ T cells, CD4+ T cells, B cells and NK cells, express Lf-R after activation. The proportion of Lf-R expressing activated gamma delta T cells is significantly larger than that of activated alpha beta T cells. Lf-R and transferrin receptors (Tr-R/CD71) show the same kinetics of appearance on activated blood lymphocytes and are, to a large extent, expressed on the same cells. However, 35% of decidual lymphocytes and 15% of activated blood lymphocytes express Lf-R only. Addition of Lf to cultures containing an optimal concentration of Tr augments the proliferative response to polyclonal T cell activators and alloantigens, suggesting that presently used standard culture conditions for in vitro activation are subopt...Continue Reading

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