Cathelicidin

Cathelicidin antimicrobial peptides (CAMP) LL-37 and FALL-39 are polypeptides that are primarily stored in the lysosomes of macrophages and polymorphonuclear leukocytes (PMNs); in humans, the CAMP gene encodes the peptide precursor CAP-18 (18 kDa), which is processed by proteinase 3-mediated extracellular cleavage into the active forms LL-37 and FALL-39.[4][5]

CAMP
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesCAMP, IPR001894, CAP-18, CAP18, CRAMP, HSD26, gene FALL39, gene LL37, FALL39, LL37, FALL-39, cathelicidin antimicrobial peptide, Cathelicidins
External IDsOMIM: 600474 MGI: 108443 HomoloGene: 110678 GeneCards: CAMP
Gene location (Human)
Chr.Chromosome 3 (human)[1]
Band3p21.31Start48,223,347 bp[1]
End48,225,491 bp[1]
RNA expression pattern
More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

820

12796

Ensembl

ENSG00000164047

ENSMUSG00000038357

UniProt

P49913

P51437

RefSeq (mRNA)

NM_004345

NM_009921

RefSeq (protein)

NP_004336

NP_034051

Location (UCSC)Chr 3: 48.22 – 48.23 Mbn/a
PubMed search[2][3]
Wikidata
View/Edit HumanView/Edit Mouse

Cathelicidins serve a critical role in mammalian innate immune defence against invasive bacterial infection.[6] The cathelicidin family of peptides are classified as antimicrobial peptides (AMPs). The AMP family also includes the defensins. Whilst the defensins share common structural features, cathelicidin-related peptides are highly heterogeneous.[6] Members of the cathelicidin family of antimicrobial polypeptides are characterized by a highly conserved region (cathelin domain) and a highly variable cathelicidin peptide domain.[6]

Cathelicidin peptides have been isolated from many different species of mammals. Cathelicidins are mostly found in neutrophils, monocytes, mast cells, dendritic cells and macrophages[7] after activation by bacteria, viruses, fungi, parasites or the hormone 1,25-D, which is the hormonally active form of vitamin D.[8] They have been found in some other cells including epithelial cells and human keratinocytes.[9]

Mechanism of antimicrobial activity

The general rule of the mechanism triggering cathelicidin action, like that of other antimicrobial peptides, involves the disintegration (damaging and puncturing) of cell membranes of organisms toward which the peptide is active.[10] Cathelicidin rapidly destroys the lipoprotein membranes of microbes enveloped in phagosomes after fusion with lysosomes in macrophages. Therefore, LL-37 can inhibit the formation of bacterial biofilms.[11]

The pleiotropic properties of LL-37 in relation to the different cells and tissues

Other activities

LL-37 plays role in the activation of cell proliferation and migration and it contributes to the wound closure process.[12] All these mechanisms together play an important role in tissue homeostasis and regenerative processes. Moreover, it has an agonistic effect on various pleiotropic receptors, for example, formyl peptide receptor like-1 (FPRL-1),[13] purinergic receptor P2X7, epidermal growth factor receptor (EGFR)[14] or insulin-like growth factor-1 receptor (IGF-1R).[15] These receptors play an important immunomodulatory role in, among other things, anti-tumor immune response.

Furthermore, it induces angiogenesis [16] and regulates apoptosis.[17] These processes are dysregulated during tumor development and thus LL-37 might be involved in pathogenesis of malignant tumors.

Characteristics

Cathelicidins range in size from 12 to 80 amino acid residues and have a wide range of structures.[18] Most cathelicidins are linear peptides with 23-37 amino acid residues, and fold into amphipathic α-helices. Additionally cathelicidins may also be small-sized molecules (12-18 residues) with beta-hairpin structures, stabilized by one or two disulphide bonds. Even larger cathelicidin peptides (39-80 amino acid residues) are also present. These larger cathelicidins display repetitive proline motifs forming extended polyproline-type structures.[6]

The cathelicidin family shares primary sequence homology with the cystatin[19] family of cysteine proteinase inhibitors, although amino acid residues thought to be important in such protease inhibition are usually lacking.

Non-human orthologs

Cathelicidin peptides have been found in humans, monkeys, mice, rats, rabbits, guinea pigs, pandas, pigs, cattle, frogs, sheep, goats, chickens, and horses. About 30 cathelicidin family members have been described in mammals.

Currently identified cathelicidin peptides include the following:[6]

  • Human: hCAP-18 (cleaved into LL-37 and FALL-39)
  • Rhesus monkey: RL-37
  • Mice:CRAMP-1/2, (Cathelicidin-related Antimicrobial Peptide[20]
  • Rats: rCRAMP
  • Rabbits: CAP-18
  • Guinea pig: CAP-11
  • Pigs: PR-39, Prophenin, PMAP-23,36,37
  • Cattle: BMAP-27,28,34 (Bovine Myeloid Antimicrobial Peptides); Bac5, Bac7
  • Frogs: cathelicidin-AL (found in Amolops loloensis)[21]
  • Chickens: Four cathelicidins, fowlicidins 1,2,3 and cathelicidin Beta-1 [22]
  • Tasmanian Devil: Saha-CATH5 [23]
  • Salmonids: CATH1 and CATH2

Clinical significance

Patients with rosacea have elevated levels of cathelicidin and elevated levels of stratum corneum tryptic enzymes (SCTEs). Cathelicidin is cleaved into the antimicrobial peptide LL-37 by both kallikrein 5 and kallikrein 7 serine proteases. Excessive production of LL-37 is suspected to be a contributing cause in all subtypes of Rosacea.[24] Antibiotics have been used in the past to treat rosacea, but antibiotics may only work because they inhibit some SCTEs.[25]

Higher plasma levels of human cathelicidin antimicrobial protein (hCAP18) appear to significantly reduce the risk of death from infection in dialysis patients. Patients with a high level of this protein were 3.7 times more likely to survive kidney dialysis for a year without a fatal infection.[26] The production of cathelicidin is up-regulated by Vitamin D.[27][28]

SAAP-148 (a synthetic antimicrobial and antibiofilm peptide) is a modified version of LL-37 that has enhanced antimicrobial activities compared to LL-37. In particular, SAAP-148 was more efficient in killing bacteria under physiological conditions.[29]

LL-37 is thought to play a role in psoriasis pathogenesis (along with other anti-microbial peptides). In psoriasis, damaged keratinocytes release LL-37 which forms complexes with self-genetic material (DNA or RNA) from other cells. These complexes stimulate dendritic cells (a type of antigen presenting cell) which then release interferon α and β which contributes to differentiation of T-cells and continued inflammation.[30] LL-37 has also been found to be a common auto-antigen in psoriasis; T-cells specific to LL-37 were found in the blood and skin in two thirds of patients with moderate to severe psoriasis.[30]

See also

References
  1. GRCh38: Ensembl release 89: ENSG00000164047 - Ensembl, May 2017
  2. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  3. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Entrez Gene: CAMP cathelicidin antimicrobial peptide".
  5. UniProt entry: P49913 Retrieved 29 November 2019
  6. Zanetti M (January 2004). "Cathelicidins, multifunctional peptides of the innate immunity". Journal of Leukocyte Biology. 75 (1): 39–48. doi:10.1189/jlb.0403147. PMID 12960280. S2CID 14902156.
  7. Vandamme D, Landuyt B, Luyten W, Schoofs L (November 2012). "A comprehensive summary of LL-37, the factotum human cathelicidin peptide". Cellular Immunology. 280 (1): 22–35. doi:10.1016/j.cellimm.2012.11.009. PMID 23246832.
  8. Liu PT, Stenger S, Li H, Wenzel L, Tan BH, Krutzik SR, et al. (March 2006). "Toll-like receptor triggering of a vitamin D-mediated human antimicrobial response". Science. 311 (5768): 1770–3. Bibcode:2006Sci...311.1770L. doi:10.1126/science.1123933. PMID 16497887. S2CID 52869005.
  9. Bals R, Wang X, Zasloff M, Wilson JM (August 1998). "The peptide antibiotic LL-37/hCAP-18 is expressed in epithelia of the human lung where it has broad antimicrobial activity at the airway surface". Proceedings of the National Academy of Sciences of the United States of America. 95 (16): 9541–6. Bibcode:1998PNAS...95.9541B. doi:10.1073/pnas.95.16.9541. PMC 21374. PMID 9689116.
  10. Kościuczuk EM, Lisowski P, Jarczak J, Strzałkowska N, Jóźwik A, Horbańczuk J, et al. (December 2012). "Cathelicidins: family of antimicrobial peptides. A review". Molecular Biology Reports. 39 (12): 10957–70. doi:10.1007/s11033-012-1997-x. PMC 3487008. PMID 23065264.
  11. Dosler S, Karaaslan E (December 2014). "Inhibition and destruction of Pseudomonas aeruginosa biofilms by antibiotics and antimicrobial peptides". Peptides. 62: 32–7. doi:10.1016/j.peptides.2014.09.021. PMID 25285879. S2CID 207359996.
  12. Shaykhiev R, Beisswenger C, Kändler K, Senske J, Püchner A, Damm T, et al. (November 2005). "Human endogenous antibiotic LL-37 stimulates airway epithelial cell proliferation and wound closure". American Journal of Physiology. Lung Cellular and Molecular Physiology. 289 (5): L842-8. doi:10.1152/ajplung.00286.2004. PMID 15964896.
  13. Chen Q, Schmidt AP, Anderson GM, Wang JM, Wooters J, Oppenheim JJ, Chertov O (October 2000). "LL-37, the neutrophil granule- and epithelial cell-derived cathelicidin, utilizes formyl peptide receptor-like 1 (FPRL1) as a receptor to chemoattract human peripheral blood neutrophils, monocytes, and T cells". The Journal of Experimental Medicine. 192 (7): 1069–74. doi:10.1084/jem.192.7.1069. PMC 2193321. PMID 11015447.
  14. von Haussen J, Koczulla R, Shaykhiev R, Herr C, Pinkenburg O, Reimer D, et al. (January 2008). "The host defence peptide LL-37/hCAP-18 is a growth factor for lung cancer cells". Lung Cancer. 59 (1): 12–23. doi:10.1016/j.lungcan.2007.07.014. PMID 17764778.
  15. Girnita A, Zheng H, Grönberg A, Girnita L, Ståhle M (January 2012). "Identification of the cathelicidin peptide LL-37 as agonist for the type I insulin-like growth factor receptor". Oncogene. 31 (3): 352–65. doi:10.1038/onc.2011.239. PMC 3262900. PMID 21685939.
  16. Koczulla R, von Degenfeld G, Kupatt C, Krötz F, Zahler S, Gloe T, et al. (June 2003). "An angiogenic role for the human peptide antibiotic LL-37/hCAP-18". The Journal of Clinical Investigation. 111 (11): 1665–72. doi:10.1172/JCI17545. PMC 156109. PMID 12782669.
  17. Ren SX, Shen J, Cheng AS, Lu L, Chan RL, Li ZJ, et al. (2013-05-20). Nie D (ed.). "FK-16 derived from the anticancer peptide LL-37 induces caspase-independent apoptosis and autophagic cell death in colon cancer cells". PLOS ONE. 8 (5): e63641. Bibcode:2013PLoSO...863641R. doi:10.1371/journal.pone.0063641. PMC 3659029. PMID 23700428.
  18. Gennaro R, Zanetti M (2000). "Structural features and biological activities of the cathelicidin-derived antimicrobial peptides". Biopolymers. 55 (1): 31–49. doi:10.1002/1097-0282(2000)55:1<31::AID-BIP40>3.0.CO;2-9. PMID 10931440.
  19. Zaiou M, Nizet V, Gallo RL (May 2003). "Antimicrobial and protease inhibitory functions of the human cathelicidin (hCAP18/LL-37) prosequence". The Journal of Investigative Dermatology. 120 (5): 810–6. doi:10.1046/j.1523-1747.2003.12132.x. PMID 12713586.
  20. Gallo RL, Kim KJ, Bernfield M, Kozak CA, Zanetti M, Merluzzi L, Gennaro R (May 1997). "Identification of CRAMP, a cathelin-related antimicrobial peptide expressed in the embryonic and adult mouse". The Journal of Biological Chemistry. 272 (20): 13088–93. doi:10.1074/jbc.272.20.13088. PMID 9148921.
  21. Hao X, Yang H, Wei L, Yang S, Zhu W, Ma D, Yu H, Lai R (August 2012). "Amphibian cathelicidin fills the evolutionary gap of cathelicidin in vertebrate". Amino Acids. 43 (2): 677–85. doi:10.1007/s00726-011-1116-7. PMID 22009138. S2CID 2794908.
  22. Achanta M, Sunkara LT, Dai G, Bommineni YR, Jiang W, Zhang G (May 2012). "Tissue expression and developmental regulation of chicken cathelicidin antimicrobial peptides". Journal of Animal Science and Biotechnology. 3 (1): 15. doi:10.1186/2049-1891-3-15. PMC 3436658. PMID 22958518.
  23. Peel E, Cheng Y, Djordjevic JT, Fox S, Sorrell TC, Belov K (October 2016). "Cathelicidins in the Tasmanian devil (Sarcophilus harrisii)". Scientific Reports. 6: 35019. Bibcode:2016NatSR...635019P. doi:10.1038/srep35019. PMC 5057115. PMID 27725697.
  24. Reinholz M, Ruzicka T, Schauber J (May 2012). "Cathelicidin LL-37: an antimicrobial peptide with a role in inflammatory skin disease". Annals of Dermatology. 24 (2): 126–35. doi:10.5021/ad.2012.24.2.126. PMC 3346901. PMID 22577261.
  25. Yamasaki K, Di Nardo A, Bardan A, Murakami M, Ohtake T, Coda A, Dorschner RA, Bonnart C, Descargues P, Hovnanian A, Morhenn VB, Gallo RL (August 2007). "Increased serine protease activity and cathelicidin promotes skin inflammation in rosacea". Nature Medicine. 13 (8): 975–80. doi:10.1038/nm1616. PMID 17676051. S2CID 23470611.
  26. Gombart AF, Bhan I, Borregaard N, Tamez H, Camargo CA, Koeffler HP, Thadhani R (February 2009). "Low plasma level of cathelicidin antimicrobial peptide (hCAP18) predicts increased infectious disease mortality in patients undergoing hemodialysis". Clinical Infectious Diseases. 48 (4): 418–24. doi:10.1086/596314. PMC 6944311. PMID 19133797.
  27. Zasloff M (January 2002). "Antimicrobial peptides of multicellular organisms". Nature. 415 (6870): 389–95. Bibcode:2002Natur.415..389Z. doi:10.1038/415389a. PMID 11807545. S2CID 205028607.
  28. Kamen DL, Tangpricha V (May 2010). "Vitamin D and molecular actions on the immune system: modulation of innate and autoimmunity". Journal of Molecular Medicine. 88 (5): 441–50. doi:10.1007/s00109-010-0590-9. PMC 2861286. PMID 20119827.
  29. de Breij A, Riool M, Cordfunke RA, Malanovic N, de Boer L, Koning RI, et al. (January 2018). "The antimicrobial peptide SAAP-148 combats drug-resistant bacteria and biofilms". Science Translational Medicine. 10 (423): eaan4044. doi:10.1126/scitranslmed.aan4044. PMID 29321257.
  30. Rendon A, Schäkel K (March 2019). "Psoriasis Pathogenesis and Treatment". International Journal of Molecular Sciences. 20 (6): 1475. doi:10.3390/ijms20061475. PMC 6471628. PMID 30909615.

Further reading
  • Overview of all the structural information available in the PDB for UniProt: P49913 (Human Cathelicidin) at the PDBe-KB.
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