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LL-37 Antimicrobial Complete Guide 2026: Research Applications Comparison
In vitro antimicrobial assays (MIC determination) 1–32 μg/mL Bacterial growth inhibition; membrane disruption visible via electron microscopy Use cation-adjusted Mueller-Hinton broth to prevent ionic interference; read MIC at 16–18 hours Standard first-line sc
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- In vitro antimicrobial assays (MIC determination)
- 1–32 μg/mL
- Bacterial growth inhibition; membrane disruption visible via electron microscopy
- Use cation-adjusted Mueller-Hinton broth to prevent ionic interference; read MIC at 16–18 hours
- Standard first-line screen for antimicrobial efficacy—reliable, reproducible, and directly comparable to antibiotic controls
- Biofilm disruption studies
- 10–50 μg/mL
- Biofilm biomass reduction; disruption of extracellular polymeric substance (EPS) matrix
- Combine LL-37 with crystal violet staining or confocal microscopy; measure at 24–48 hours post-treatment
- Higher concentrations required vs planktonic bacteria—biofilm matrix shields cells from peptide contact
- Wound healing models (in vitro scratch assays)
- 0.5–5 μg/mL
- Accelerated keratinocyte migration; increased wound closure rates by 40–60%
- Use serum-free media to isolate LL-37 effect; measure closure at 12–24 hour intervals
- Low-dose LL-37 drives proliferation without cytotoxicity—ideal range for tissue regeneration research
- Endotoxin neutralization assays
- 2–10 μg/mL
- Reduced LPS-induced cytokine release (TNF-α, IL-6) in macrophage cultures
- Pre-incubate LL-37 with LPS for 30 minutes before adding to cells; measure cytokines via ELISA
- LL-37 binds lipid A domain—this is a direct chemical interaction, not an enzymatic process
- Synergy testing with antibiotics
- 0.5–4 μg/mL LL-37 + subinhibitory antibiotic
- Fractional inhibitory concentration index (FICI) <0.5 indicates synergy
- Use checkerboard dilution method; calculate FICI from combined MIC reductions
- LL-37 enhances membrane permeability—allows antibiotics to penetrate bacterial cells more effectively