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PLAP-1/Asporin Regulates TLR2- and TLR4-induced Inflammatory Responses.

S Yamaba1, S Yamada2, T Kajikawa1

  • 1Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan.

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|September 25, 2015
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Periodontal ligament-associated protein 1 (PLAP-1)/asporin suppresses inflammation in periodontitis by directly interacting with Toll-like receptors 2 and 4 (TLR2 and TLR4). This protein plays a defensive role, potentially offering new therapeutic avenues for periodontal disease.

Keywords:
ECM proteinLPSextracellular matrix (ECM)inflammatory cytokinesperiodontal ligament (PDL)periodontitis

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Area of Science:

  • Biochemistry
  • Immunology
  • Periodontology

Background:

  • Periodontal ligament-associated protein 1 (PLAP-1)/asporin is an extracellular matrix protein crucial for periodontal tissue homeostasis.
  • Its role in inflammatory responses during periodontitis remains largely uncharacterized.

Purpose of the Study:

  • To investigate the hypothesis that PLAP-1/asporin influences periodontitis pathogenesis by modulating inflammatory responses to periodontopathic bacteria.
  • To elucidate the molecular mechanisms underlying PLAP-1/asporin's effect on Toll-like receptor (TLR) signaling.

Main Methods:

  • Overexpression of PLAP-1/asporin in periodontal ligament cells.
  • Treatment of macrophages with recombinant PLAP-1/asporin.
  • Assays for proinflammatory cytokine expression (e.g., TNF-α, IL-6).
  • Analysis of NF-κB and IκB kinase α signaling pathways.
  • Immunoprecipitation assays to confirm protein binding.

Main Results:

  • PLAP-1/asporin overexpression significantly downregulated TLR2- and TLR4-induced proinflammatory cytokine expression in periodontal ligament cells.
  • Recombinant PLAP-1/asporin inhibited TLR2- and TLR4-induced cytokine release in macrophages.
  • PLAP-1/asporin suppressed NF-κB activation and reduced IκB kinase α degradation.
  • Direct binding of PLAP-1/asporin to TLR2 and TLR4 was confirmed.

Conclusions:

  • PLAP-1/asporin negatively regulates TLR2- and TLR4-mediated inflammatory responses through direct molecular interactions.
  • PLAP-1/asporin exhibits a protective role in periodontitis by suppressing detrimental TLR signaling.
  • Modulation of PLAP-1/asporin activity may offer potential therapeutic benefits for periodontal treatments.