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Amyloid-β peptide-induced extracellular S100A9 depletion is associated with decrease of antimicrobial peptide activity in human THP-1 monocytes

DC Field Value Language
dc.contributor.authorLee, Eun Ok-
dc.contributor.authorYang, Ji Hye-
dc.contributor.authorChang, Keun-A-
dc.contributor.authorSuh, Yoo-Hun-
dc.contributor.authorChong, Young Hae-
dc.date.accessioned2017-01-31T07:42:37Z-
dc.date.available2017-01-31T07:42:37Z-
dc.date.issued2013-05-30-
dc.identifier.citationJournal of Neuroinflammation, 10(1):840ko_KR
dc.identifier.urihttps://hdl.handle.net/10371/100320-
dc.description.abstractAbstract

Background
S100A9 protein (myeloid-related protein MRP14, also referred to as calgranulin B) is a reliable marker of inflammation, an important proinflammatory factor of innate immunity and acts as an additional antimicrobial peptide in the innate immune system. Evidence indicates that S100A9 contributes to Alzheimers disease (AD) pathology, although the precise mechanisms are not clear.


Methods
We were interested to study the mechanisms of S100A9 release upon Aβ1-42 stimulation, the potential roles of extracellular S100A9 depletion in Aβ-induced cytotoxicity, and the interaction with innate immune response in THP-1 monocytic cells that have been challenged with mostly Aβ1-42 monomers instead of oligomers. We used protein preparation, Ca2+ influx fluorescence imaging, MTT assay, siRNA knockdown, colony forming units (CFUs) assay and western blotting techniques to perform our study.


Results
Aβ1-42 monomers elicited a marked decrease of S100A9 release into the cell culture supernatant in a dose-dependent manner in human THP-1 monocytes. This reduction of S100A9 release was accompanied by an increase of intracellular Ca2+ level. Aβ1-42-mediated decrease of S100A9 release was not associated with Aβ1-42-induced cytotoxicity as measured by MTT reduction assay. This observation was confirmed with the recombinant S100A9, which had little effect on Aβ1-42-induced cytotoxicity. Moreover, depletion of S100A9 with siRNA did not significantly evoke the cell toxicity. On the other hand, Aβ1-42-induced extracellular S100A9 depletion resulted in decreased antimicrobial activity of the culture supernatant after Aβ1-42 stimulation. Immunodepletion of S100A9 with anti-S100A9 also decreased the antimicrobial peptide activity of the vehicle treated culture supernatant. Consistently, the recombinant S100A9 clearly elicited the antimicrobial peptide activity in vitro, confirming the observed antimicrobial activity of S100A9 in the culture supernatant.


Conclusion
Collectively, our findings suggest that the mostly monomeric form of Aβ1-42 negatively regulates the innate immune system by down-regulating the secretion of S100A9, which is likely a main mediator of antimicrobial activity in the conditioned media of human THP-1 monocytes.
ko_KR
dc.language.isoenko_KR
dc.publisherBioMed Centralko_KR
dc.subjectAlzheimer’s diseaseko_KR
dc.subjectAβ1-42ko_KR
dc.subjectcytotoxicityko_KR
dc.subjectS100A9ko_KR
dc.subjectAntimicrobial activityko_KR
dc.subjectInnate immune responseko_KR
dc.titleAmyloid-β peptide-induced extracellular S100A9 depletion is associated with decrease of antimicrobial peptide activity in human THP-1 monocytesko_KR
dc.typeArticleko_KR
dc.contributor.AlternativeAuthor이은옥-
dc.contributor.AlternativeAuthor양지혜-
dc.contributor.AlternativeAuthor장근아-
dc.contributor.AlternativeAuthor서유훈-
dc.contributor.AlternativeAuthor정영해-
dc.identifier.doi10.1186/1742-2094-10-68-
dc.language.rfc3066en-
dc.rights.holderLee et al.; licensee BioMed Central Ltd.-
dc.date.updated2017-01-29T03:03:45Z-
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