Profile:
LL-37 is a 37‑amino‑acid cationic host defense peptide (the only human cathelicidin), naturally produced by neutrophils, macrophages, epithelial cells, and skin cells. It exhibits broad‑spectrum antimicrobial, immunomodulatory, anti‑inflammatory, pro‑angiogenic, and tissue‑repairing activities, making it a highly promising candidate in pharmaceuticals, medical devices, wound care, cosmetics, and research toolsNational Center for Biotechnology Information.
1. Pharmaceutical & Clinical Therapeutics
Antimicrobial & Anti‑Infective Therapy
Broad‑spectrum antimicrobial activity
Kills or inhibits Gram‑positive (e.g., MRSA, S. aureus), Gram‑negative (e.g., E. coli, Pseudomonas), fungi (e.g., Candida albicans), and viruses (e.g., HIV‑1, influenza) by disrupting microbial membranes and interfering with intracellular processes.
Combats multidrug‑resistant (MDR) pathogens
A leading candidate for new antibiotics against MRSA, carbapenem‑resistant bacteria, and ESKAPE pathogens, addressing the global crisis of antibiotic resistance.
Respiratory infections
Investigated for treating pneumonia, COPD, and viral respiratory infections by enhancing mucosal immunity and reducing inflammation.
Oral & mucosal infections
Developed into mouthwashes, gels, and lozenges for gingivitis, periodontitis, and oral candidiasis.
Wound Healing & Tissue Regeneration
Promotes chronic wound repair
Accelerates healing of diabetic foot ulcers, burns, and surgical wounds by stimulating angiogenesis, keratinocyte migration, and collagen synthesis.
Anti‑inflammatory & tissue protection
Reduces excessive inflammation, modulates cytokine release (e.g., TNF‑α), and protects tissue from damage during infection or injury.
Immunomodulation & Inflammatory Disorders
Treats inflammatory diseases
Shows potential for psoriasis, inflammatory bowel disease (IBD), rheumatoid arthritis, and ulcerative colitis by balancing immune responses and maintaining barrier integrity.
Immune adjuvant & vaccine enhancement
Boosts immune cell activation (e.g., TLR signaling) and improves vaccine efficacy, especially for cancer and infectious diseasesPMC.
Cancer Therapy & Immunotherapy
Ophthalmology
Used in eye drops and ocular coatings to treat dry eye, conjunctivitis, and corneal infections, protecting the ocular surface and promoting healing.
2. Medical Devices & Biomaterials
Surface coating for implants & devices
Applied to catheters, surgical sutures, orthopedic implants, and dental materials to prevent biofilm formation, reduce infection risk, and improve tissue integration.
Advanced wound dressings
Incorporated into hydrogels, films, and nanofibers for controlled release, enhancing antimicrobial and healing effects.
3. Cosmetics & Personal Care
Acne & sensitive skin care
Targets Cutibacterium acnes, reduces inflammation, and soothes redness in acne and sensitive skin formulations.
Anti‑aging & barrier repair
Promotes collagen production, improves skin elasticity, and strengthens the epidermal barrier in serums, creams, and masks.
Natural preservative
Inhibits microbial growth in cosmetics, replacing synthetic preservatives.
4. Research & Biotechnology Tools
Immunology research
Used to study innate immunity, TLR signaling, and host‑pathogen interactions.
Drug delivery
Acts as a cell‑penetrating peptide to deliver nucleic acids, proteins, and drugs into target cells.
Biomedical engineering
Scaffold component for tissue engineering and regenerative medicine.
Key Biological Features
Human‑derived: High biocompatibility and low immunogenicity.
Multifunctional: Antimicrobial, immunomodulatory, pro‑healing, and pro‑angiogenicNational Center for Biotechnology Information.
Low resistance potential: Microbes rarely develop resistance to membrane‑targeting peptides.
Stability: Tolerates moderate heat and pH, suitable for diverse formulations.
China
