Abstract
Apart from their direct antimicrobial activities against invading pathogens, antimicrobial peptides exhibit additional protective functions that have led to their being named host defense peptides (HDPs). These functions include the stimulation of the production of cytokines/chemokines, the promotion of chemotaxis and cell proliferation and the induction of angiogenesis and wound healing. AG-30/5C is a novel angiogenic HDP that in addition to its antimicrobial activity also activates fibroblasts and endothelial cells and promotes angiogenesis and wound healing. Given that mast cells are found primarily in the vicinity of vessels, where they are intimately involved in wound healing, we hypothesized that AG-30/5C may activate mast cells. We demonstrated that AG-30/5C activated LAD2 human mast cells to degranulate and produce lipid mediators including leukotriene C4, prostaglandin D2 and E2. Moreover, AG-30/5C increased mast cell chemotaxis and induced the production of the cytokines GM-CSF and TNF-α and various chemokines, such as IL-8, MCP-1, MCP-3, MIP-1α and MIP-1β. The chemotaxis and cytokine/chemokine production induced by AG-30/5C were suppressed by both pertussis toxin and U-73122, suggesting the involvement of the G protein and phospholipase C pathways in AG-30/5C-induced mast cell activation. Furthermore, these pathways were activated downstream of the MAPK and NF-κB signaling molecules, as demonstrated by the inhibitory effects of ERK-, JNK-, p38- and NF-κB-specific inhibitors on cytokine/chemokine production. Interestingly, AG-30/5C caused the phosphorylation of MAPKs and IκB. We suggest that the angiogenic and antimicrobial peptide AG-30/5C plays a key role in the recruitment and activation of human mast cells at inflammation and wound sites.
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Abbreviations
- AG-30/5C:
-
Angiogenic peptide-30/5C
- EIA:
-
Enzyme immunoassay
- ERK:
-
Extracellular signal-regulated kinase
- GM-CSF:
-
Granulocyte-macrophage colony-stimulating factor
- hBD:
-
Human β-defensin
- HDP:
-
Host defense peptide
- IL:
-
Interleukin
- JNK:
-
c-Jun N-terminal kinase
- LT:
-
Leukotriene
- MAPK:
-
Mitogen-activated protein kinase
- MCP:
-
Monocyte chemoattractant protein
- MIP:
-
Macrophage inflammatory protein
- NF-κB:
-
Nuclear factor-κB
- PG:
-
Prostaglandin
- PLC:
-
Phospholipase C
- TNF:
-
Tumor necrosis factor
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Acknowledgments
We would like to express our deepest gratitude to all members of the Atopy (Allergy) Research Center, Juntendo University Graduate School of Medicine for their comments and Michiyo Matsumoto for secretarial assistance. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (Grant Number: 26461703 to F.N.) and by the Atopy (Allergy) Research Center, Juntendo University, Tokyo, Japan.
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Kanazawa, K., Okumura, K., Ogawa, H. et al. An antimicrobial peptide with angiogenic properties, AG-30/5C, activates human mast cells through the MAPK and NF-κB pathways. Immunol Res 64, 594–603 (2016). https://doi.org/10.1007/s12026-015-8759-5
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DOI: https://doi.org/10.1007/s12026-015-8759-5