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Regulation of epidermal Langerhans cell migration by lactoferrin
M Cumberbatch1, R J Dearman, S Uribe-Luna
1Zeneca Central Toxicology Laboratory, Macclesfield, Cheshire, UK.
Immunology
|May 16, 2000
Summary
Lactoferrin (LF) directly inhibits skin immune cell migration and cytokine production, suggesting it has anti-inflammatory properties. This protein may play a role in maintaining normal skin immune function.
Area of Science:
- Immunology
- Dermatology
- Biochemistry
Background:
- Lactoferrin (LF) is an iron-binding glycoprotein with known anti-inflammatory functions.
- LF's anti-inflammatory effects may be indirect, linked to lipopolysaccharide (LPS) binding, or direct via membrane receptors.
- Cutaneous immune responses, like Langerhans cell (LC) migration, are regulated by tumor necrosis factor-alpha (TNF-alpha).
Purpose of the Study:
- To investigate the direct anti-inflammatory properties of Lactoferrin (LF) in a model of cutaneous immune function.
- To determine if LF's inhibitory effects on LC migration are mediated by TNF-alpha.
- To explore LF's role in regulating skin immune cell dynamics.
Main Methods:
- Utilized a mouse model of oxazolone-induced allergic skin inflammation.
- Administered recombinant murine LF (iron-saturated and iron-depleted) intradermally.
- Assessed LC migration and dendritic cell (DC) accumulation in lymph nodes.
- Investigated LF's effect on TNF-alpha and interleukin-1beta (IL-1beta) induced responses.
- Performed immunohistochemical analysis to localize LF in skin.
Main Results:
- Intradermal LF significantly inhibited allergen-induced LC migration and DC accumulation.
- LF did not inhibit LC migration induced directly by TNF-alpha.
- LF impaired migration stimulated by IL-1beta, which is dependent on TNF-alpha.
- Immunohistochemistry confirmed LF presence in skin, primarily associated with keratinocytes.
Conclusions:
- Lactoferrin possesses direct immunomodulatory and anti-inflammatory activity in the skin.
- LF likely exerts its effects by inhibiting local cytokine production, particularly TNF-alpha.
- LF, as a component of normal skin, may contribute to the homeostatic regulation of cutaneous immunity.