Bovine Lactoferrin-Induced CCL1 Expression Involves Distinct Receptors in Monocyte-Derived Dendritic Cells and Their...

Area of Science:

• Immunology
• Cell Biology

Background:

• Lactoferrin (LF) is known for its immunomodulatory properties, including the regulation of cytokine and chemokine secretion.
• Monocytes (Mo) differentiate into dendritic cells (DCs), key players in the immune system.

Purpose of the Study:

• To investigate the effect of bovine lactoferrin (bLF) on CCL1 secretion in monocytes and monocyte-derived dendritic cells (MoDCs).
• To elucidate the specific cell surface receptors involved in bLF-mediated CCL1 modulation.

Main Methods:

• Monocytes and MoDCs were treated with bLF.
• CCL1 secretion and transcript levels were measured.
• Blocking studies using antibodies against CD36 and toll-like receptor (TLR)2 were performed.

Main Results:

• bLF significantly increased CCL1 secretion and transcript accumulation in a concentration- and time-dependent manner in both monocytes and MoDCs.
• CD36 engagement was crucial for bLF-induced CCL1 upregulation in differentiating monocytes.
• TLR2 blocking markedly reduced bLF-induced CCL1 production in MoDCs.

Conclusions:

• bLF differentially modulates CCL1 secretion in monocytes and MoDCs through distinct surface receptors (CD36 and TLR2, respectively).
• These findings underscore the cell-specific immunomodulatory effects of bLF.
• The differential responses may have implications for bLF's role in various physiological and pathological conditions.