Home \ Antibodies \ LL-37/CAP-18, Human, mAb 1-1C12
Catalog # HM2071

LL-37/CAP-18, Human, mAb 1-1C12


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The monoclonal antibody 1-1C12 recognizes free LL-37 as well as its precursor human CAP18 (hCAP18). hCAP18 is a cathelicidin protein of ~18 kDa. It belongs to the cathelicidin family of antimicrobial peptides that are characterized by a conserved N-terminal cathelin domain and a variable C-terminal antimicrobial domain. Cathelicidins are predominantly found in the peroxidase-negative granules of neutrophils. During bacterial infections, the life span of neutrophils is regulated by various pathogen- and host-derived substances. Within the neutrophils, the cathelicidins are synthesized as preproproteins. After removal of the signal peptide,they are stored in granules as inactive proforms. The C-terminal antimicrobial peptides are activated when cleaved from the proforms of the cathelicidins by serine proteases from azurophil granules.
hCAP18 is a major protein in specific granules of neutrophils, but it is also present in subpopulations of lymphocytes and monocytes, in squamous epithelia (of the mouth, tongue, esophagus, cervix, and vagina), pulmonary epithelium, keratinocytes in inflammatory skin diseases and in the epididymus. The antibacterial C-terminus of hCAP18, LL-37 (37 amino acids), has been shown to exert broad antimicrobial activity towards gram-negative as well as gram-positive bacteria and to have synergistic antibacterial effects with the defensins. For instance deficiency in saliva, LL-37 accords with occurrence of periodontal disease in patients with morbus Kostmann. LL-37 does not only kill bacteria, but can also modulate (suppress) neutrophil apoptosis via the activation of FPRL1 and P2X7 in bacterial infections. Suppression of neutrophil apoptosis results in the prolongation of their life span, and may be advantageous for host defense against bacterial invasion. Moreover it functions as a chemotactic agent for neutrophils, monocytes and T cells. LL-37 is markedly resistant to proteolytic degradation and to a limited extent also cytotoxic towards mammalian cells.

Immuno assays, Immuno fluorescence, Paraffin sections, Western blot

Application Notes
IA: 1-1c12 was used as detection antibody (1:120 in dilution buffer)
IF: paraformaldehyde fixed cells were incubated with 1-1c12 (1:50 diluted)
P: Sections were deparaffinized with sodium citrate and stained for LL-37 (1:50 diluted)
W:- A non-reduced sample treatment and denaturing or native SDS-PAGE was applied. Proteins were transferred to nitrocellulose, blocked with 5% dry milk and incubated with 1-1c12 , 1:250-1000 dilution. The band sizes are 18 and 4.5 kDa for hCAP-18 and LL-37 respectively (Ref.1-3)

For Western blotting dilutions to be used depend on detection system applied. It is recommended that users test the reagent and determine their own optimal dilutions. The typical starting working dilution is 1:50.

Positive Control
Human neutrophils

Product type
Monoclonal antibodies
20 µg, 100 µg
0.2 ml (100 µg/ml) 0.2 µm filtered antibody solution in PBS, containing 0.1% bovine serum albumin and 0.02% sodium azide.
mixture of synthetic native and glutaraldehyde cross-linked LL-37<sup>1sup>
Mouse IgG2a
Antibacterial protein LL-37, Cathelicidin antimicrobial peptide CAP18; CRAMP; FALL-39; FALL39;- CAP-18; hCAP-18; HSD26
Storage and stability
Product should be stored at 4 °C. Under recommended storage conditions, product is stable for one year.
For research use only. Not for use in or on humans or animals or for diagnostics. It is the responsibility of the user to comply with all local/state and Federal rules in the use of this product. Hycult Biotech is not responsible for any patent infringements that might result with the use of or derivation of this product.
Autoimmunity, Infectious diseases

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