Name: LL-37 5mg Pre-Mixed Stabilized Pen
SKU: 1402
Availability: InStock

Description

LL-37, sourced from the hCAP-18 protein, is the only human antimicrobial peptide we know of from the cathelicidin family. It’s key to our natural defenses, acting on germ membranes and adjusting immune signals. You can find LL-37 in neutrophils, epithelial tissues, and on barrier surfaces, where it helps defend us early on.

Our LL-37 comes ready-to-use in a stabilized injection pen for SubQ use. This method allows steady, body-wide exposure and reliable immune signal participation in studies. Each pen is freshly made to keep its structure sound, and dosages are standardized. Note that this product is only for lab and research use.

Studies show LL-37 fights bacteria, viruses, and fungi, and it changes cytokine output and chemotactic signals. It’s also part of immune cell movement, blood vessel creation, and wound healing. Research spans defense biology, barrier studies, inflammation control, and tissue repair research.

Mechanism of Action

LL-37 supports innate immune defense by directly interacting with microbial membranes and modulating host immune signaling pathways. It disrupts pathogen membranes while also influencing cytokine release and immune cell recruitment. This dual antimicrobial and immunomodulatory profile distinguishes LL-37 within host defense research.

Benefits

Broad-spectrum antimicrobial membrane destabilization:
LL-37 is a cationic amphipathic peptide that preferentially binds negatively charged phospholipids present on microbial membranes. Through electrostatic attraction and hydrophobic insertion, it disrupts membrane integrity and induces structural destabilization. This mechanism results in rapid membrane permeability changes rather than inhibition of intracellular enzymatic pathways. Because its activity is membrane-targeted, it does not rely on specific metabolic targets that commonly mutate in antibiotic resistance models. In vitro systems demonstrate disruption of Gram-positive and Gram-negative bacterial membranes as well as certain viral envelopes. This structural mode of action positions LL-37 as a host-defense peptide rather than a classical antimicrobial compound.
Integration within innate immune signaling networks:
Beyond direct pathogen interaction, LL-37 functions as an immunomodulatory mediator. It interacts with toll-like receptor pathways and modulates downstream NF-kB signaling cascades. This influence alters cytokine and chemokine expression patterns in epithelial and immune cells. LL-37 does not act as a simple immune stimulant but rather fine-tunes inflammatory signaling intensity depending on environmental context. This regulatory capability supports coordinated innate immune activation rather than excessive inflammatory amplification.
Chemotactic recruitment of immune effector cells:
LL-37 participates in chemotactic signaling processes that attract neutrophils, monocytes, dendritic cells, and T lymphocytes to sites of microbial exposure. Experimental models show increased migration of immune cells toward LL-37 concentration gradients. This recruitment facilitates early containment of pathogens before adaptive immunity becomes dominant. Its role in shaping immune cell trafficking dynamics highlights its importance in early-phase host defense biology.
Modulation of epithelial barrier defense mechanisms:
LL-37 is expressed in skin, respiratory epithelium, and gastrointestinal mucosa, where it contributes to surface-level microbial regulation. It influences tight junction integrity and epithelial cell proliferation in laboratory models. These effects support structural barrier resilience against microbial invasion. By integrating antimicrobial action with barrier maintenance, LL-37 serves as a multifunctional component of first-line defense systems.
Angiogenic and tissue repair signaling involvement:
Research indicates that LL-37 influences endothelial cell migration and angiogenic signaling pathways. It has been associated with vascular endothelial growth factor modulation in experimental systems. These effects contribute to organized tissue repair responses following injury. The peptide’s involvement in both immune defense and regenerative processes reflects its dual functional role within host physiology.
Context-dependent regulation of inflammatory cascades:
LL-37 demonstrates the capacity to either enhance or suppress inflammatory mediator expression depending on cellular environment. In certain models, it reduces excessive pro-inflammatory cytokine production, while in others it enhances targeted immune activation. This context-dependent modulation suggests a role in immune calibration rather than linear stimulation. Such flexibility is central to its positioning within immune balance research domains.
Interaction with microbial biofilm dynamics:
Biofilms represent structured microbial communities resistant to conventional antimicrobial therapies. LL-37 has been evaluated for its ability to interfere with biofilm formation and structural integrity in experimental systems. Membrane disruption and interference with microbial communication pathways contribute to this activity. These findings extend its research relevance into antimicrobial resistance and chronic infection models.
Host-pathogen interface signaling integration:
LL-37 operates at the interface between host tissue and microbial exposure. It integrates membrane-level antimicrobial action with intracellular immune signaling modulation. This dual functionality allows coordinated responses involving pathogen clearance, immune recruitment, and tissue remodeling. Its evolutionary conservation within the cathelicidin family underscores its central role in innate host defense biology.
Controlled subcutaneous delivery for structured immune research:
Provided in a stabilized pre-mixed injection pen for SubQ administration, LL-37 supports predictable systemic exposure in experimental protocols. Subcutaneous delivery allows structured dosing parameters and reproducible immune engagement conditions. Each unit is freshly prepared and intended strictly for laboratory use only.