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Cationic molecules branched polyethylenimine (BPEI) and PEGylated BPEI (PEG-BPEI) effectively neutralize lipoteichoic acid (LTA) from Staphylococcus aureus, reducing inflammatory cytokine release. These compounds show promise as novel wound healing therapeutics due to their efficacy and low toxicity.

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Area of Science:

  • Immunology
  • Biochemistry
  • Materials Science

Background:

  • Innate immunity uses toll-like receptors to recognize pathogen-associated molecular patterns (PAMPs), such as lipoteichoic acid (LTA) from *Staphylococcus aureus*.
  • PAMPs trigger inflammatory responses that can impede wound healing and lead to chronic wounds.
  • Neutralizing PAMPs can counteract dysregulated inflammation and promote healing.

Purpose of the Study:

  • To evaluate the efficacy of cationic molecules branched polyethylenimine (BPEI), PEGylated BPEI (PEG-BPEI), and polymyxin-B in neutralizing LTA.
  • To assess the impact of these molecules on TNF-α cytokine release and gene expression.
  • To compare the in vitro cytotoxicity and LTA neutralization capabilities of BPEI, PEG-BPEI, and polymyxin-B.

Main Methods:

  • Enzyme-linked immunosorbent assay (ELISA) was used to measure TNF-α cytokine release from human THP-1 monocytes.
  • Quantitative polymerase chain reaction (qPCR) was employed to analyze TNF-α gene expression.
  • In vitro cytotoxicity assays determined the IC50 values for BPEI, PEG-BPEI, and polymyxin-B.

Main Results:

  • BPEI and PEG-BPEI demonstrated concentration-dependent neutralization of LTA and reduction of TNF-α release.
  • BPEI and PEG-BPEI significantly reduced TNF-α gene expression.
  • PEG-BPEI exhibited lower cytotoxicity (IC50 = 2661 μM) compared to BPEI (IC50 = 853 μM), with both being less toxic than polymyxin-B (IC50 = 79 μM). Polymyxin-B was also less effective at LTA neutralization.

Conclusions:

  • BPEI and PEG-BPEI are effective in neutralizing LTA and reducing inflammatory responses, offering a potential therapeutic strategy for wound healing.
  • PEGylation of BPEI enhances its safety profile without compromising efficacy.
  • The multi-modal action of BPEI and PEG-BPEI surpasses single-modality treatments, supporting their development as advanced wound therapeutics.