Molecules 2013, 18(6), 6455-6468; doi:10.3390/molecules18066455
Article

Bioactive Secondary Metabolites of a Marine Bacillus sp. Inhibit Superoxide Generation and Elastase Release in Human Neutrophils by Blocking Formyl Peptide Receptor 1

1,2,3email, 4email, 3email, 5email, 3email, 3email and 3,6,* email
Received: 25 April 2013; in revised form: 28 May 2013 / Accepted: 30 May 2013 / Published: 3 June 2013
(This article belongs to the Section Natural Products)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: It is well known that overwhelming neutrophil activation is closely related to acute and chronic inflammatory injuries. Formyl peptide receptor 1 (FPR1) plays an important role in activation of neutrophils and may represent a potent therapeutic target in inflammatory diseases. In the present study, we demonstrated that IA-LBI07-1 (IA), an extract of bioactive secondary metabolites from a marine Bacillus sp., has anti-inflammatory effects in human neutrophils. IA significantly inhibited superoxide generation and elastase release in formyl-L-methionyl-L-leucyl-L-phenylalanine (FMLP)-activated neutrophils, but failed to suppress the cell responses activated by non-FPR1 agonists. IA did not alter superoxide production and elastase activity in cell-free systems. IA also attenuated the downstream signaling from FPR1, such as the Ca2+, MAP kinases and AKT pathways. In addition, IA inhibited the binding of N-formyl-Nle-Leu-Phe-Nle-Tyr-Lys-fluorescein, a fluorescent analogue of FMLP, to FPR1 in human neutrophils and FPR1-transfected HEK293 cells. Taken together, these results show that the anti-inflammatory effects of IA in human neutrophils are through the inhibition of FPR1. Also, our data suggest that IA may have therapeutic potential to decrease tissue damage induced by human neutrophils.
Keywords: elastase; formyl peptide receptor; Bacillus sp.; neutrophil; superoxide
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MDPI and ACS Style

Yang, S.-C.; Lin, C.-F.; Chang, W.-Y.; Kuo, J.; Huang, Y.-T.; Chung, P.-J.; Hwang, T.-L. Bioactive Secondary Metabolites of a Marine Bacillus sp. Inhibit Superoxide Generation and Elastase Release in Human Neutrophils by Blocking Formyl Peptide Receptor 1. Molecules 2013, 18, 6455-6468.

AMA Style

Yang S-C, Lin C-F, Chang W-Y, Kuo J, Huang Y-T, Chung P-J, Hwang T-L. Bioactive Secondary Metabolites of a Marine Bacillus sp. Inhibit Superoxide Generation and Elastase Release in Human Neutrophils by Blocking Formyl Peptide Receptor 1. Molecules. 2013; 18(6):6455-6468.

Chicago/Turabian Style

Yang, Shun-Chin; Lin, Chwan-Fwu; Chang, Wen-Yi; Kuo, Jimmy; Huang, Yin-Ting; Chung, Pei-Jen; Hwang, Tsong-Long. 2013. "Bioactive Secondary Metabolites of a Marine Bacillus sp. Inhibit Superoxide Generation and Elastase Release in Human Neutrophils by Blocking Formyl Peptide Receptor 1." Molecules 18, no. 6: 6455-6468.

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