LL-37
Definition: A naturally occurring antimicrobial peptide that neutralizes bacteria, fungi, and viruses while modulating the inflammatory response.
What is LL-37?
LL-37 is a 37-amino acid peptide that represents the active, mature form of human Cathelicidin Antimicrobial Peptide (CAMP). It is the only cathelicidin-class peptide found in humans. Produced by immune cells (like neutrophils and macrophages) and epithelial cells, LL-37 is a primary component of the body's innate immune defense, acting as a natural antibiotic and immunomodulator.
How does LL-37 work?
LL-37 possesses a highly positive (cationic) charge and an amphipathic structure. This allows it to bind directly to the negatively charged outer membranes of bacteria, fungi, and enveloped viruses. It inserts itself into the lipid bilayer, creating physical pores that cause membrane lysis and rapid pathogen death. Beyond direct killing, LL-37 acts as an alarmin—it recruits immune cells to infection sites, neutralizes toxic bacterial lipopolysaccharides (LPS), and modulates cytokine release.
Primary Documented Uses
- Combating chronic, drug-resistant bacterial, viral, and fungal infections
- Accelerating the healing of chronic wounds, diabetic ulcers, and severe burns
- Modulating innate immune responses and resolving persistent biofilms
Research Summary
Scientific literature demonstrates LL-37's broad-spectrum efficacy against multi-drug resistant 'superbugs' (such as MRSA and Pseudomonas aeruginosa). Research also highlights its role in accelerating wound healing by promoting epithelial cell migration and angiogenesis. However, because of its potent activity, dysregulated or chronically elevated LL-37 levels have been linked to autoimmune conditions like psoriasis and rosacea, emphasizing its role as a delicate immune balancer.
Legal and Regulatory Status
LL-37 is not FDA-approved for human clinical use. It is currently undergoing clinical trials for topical wound healing and infectious disease applications. It is legally sold strictly as a laboratory research chemical.
Frequently Asked Questions
What is LL-37?
LL-37 is A naturally occurring antimicrobial peptide that neutralizes bacteria, fungi, and viruses while modulating the inflammatory response.
How does LL-37 work?
LL-37 possesses a highly positive (cationic) charge and an amphipathic structure. This allows it to bind directly to the negatively charged outer membranes of bacteria, fungi, and enveloped viruses. It inserts itself into the lipid bilayer, creating physical pores that cause membrane lysis and rapid pathogen death. Beyond direct killing, LL-37 acts as an alarmin—it recruits immune cells to infection sites, neutralizes toxic bacterial lipopolysaccharides (LPS), and modulates cytokine release.
What does research say about LL-37?
Scientific literature demonstrates LL-37's broad-spectrum efficacy against multi-drug resistant 'superbugs' (such as MRSA and Pseudomonas aeruginosa). Research also highlights its role in accelerating wound healing by promoting epithelial cell migration and angiogenesis. However, because of its potent activity, dysregulated or chronically elevated LL-37 levels have been linked to autoimmune conditions like psoriasis and rosacea, emphasizing its role as a delicate immune balancer.
Is LL-37 FDA-approved or legally available?
LL-37 is not FDA-approved for human clinical use. It is currently undergoing clinical trials for topical wound healing and infectious disease applications. It is legally sold strictly as a laboratory research chemical.