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Cathelicidin antimicrobial peptide

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cathelicidin
Identifiers
Aliasescathelicidins
External IDsGeneCards: [1]; OMA:- orthologs
Orthologs
SpeciesHumanMouse
Entrez

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Ensembl

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UniProt

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RefSeq (mRNA)

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RefSeq (protein)

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Location (UCSC)n/an/a
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Wikidata
View/Edit Human

Cathelicidin antimicrobial peptide (CAMP) is an antimicrobial peptide encoded in the human by the CAMP gene.[1] The active form is LL-37. In humans, CAMP encodes the peptide precursor CAP-18 (18 kDa), which is processed by proteinase 3-mediated extracellular cleavage into the active form LL-37.[2][1]

The cathelicidin family includes 30 types of which LL-37 is the only cathelicidin in the human.[3] Cathelicidins are stored in the secretory granules of neutrophils and macrophages and can be released following activation by leukocytes.[4] Cathelicidin peptides are dual-natured molecules called amphiphiles: one end of the molecule is attracted to water and repelled by fats and proteins, and the other end is attracted to fat and proteins and repelled by water. Members of this family react to pathogens by disintegrating, damaging, or puncturing cell membranes.

Cathelicidins thus serve a critical role in mammalian innate immune defense against invasive bacterial infection.[5] 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.[5] Members of the cathelicidin family of antimicrobial polypeptides are characterized by a highly conserved region (cathelin domain) and a highly variable cathelicidin peptide domain.[5]

Cathelicidin peptides have been isolated from many different species of mammals, including marsupials.[6] 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]

Etymology

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The term was coined in 1995 from cathelin, due to the characteristic cathelin-like domain present in cathelicidins.[10] The name cathelin itself is coined from cathepsin L inhibitor in 1989.[11]

Mechanism of antimicrobial activity

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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.[4]

Cathelicidins rapidly destroy the lipoprotein membranes of microbes enveloped in phagosomes after fusion with lysosomes in macrophages. Therefore, LL-37 can inhibit the formation of bacterial biofilms.[12]

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

Other activities

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LL-37 plays a role in the activation of cell proliferation and migration, contributing to the wound closure process.[13] All these mechanisms together play an essential 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),[14] purinergic receptor P2X7, epidermal growth factor receptor (EGFR)[15] or insulin-like growth factor-1 receptor (IGF-1R).[16]

Furthermore, it induces angiogenesis[17] and regulates apoptosis.[18]

Characteristics

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Cathelicidins range in size from 12 to 80 amino acid residues and have a wide range of structures.[19] 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.[5]

In 1995, Gudmundsson et al. assumed that the active antimicrobial peptide is formed of a 39-residue C-terminal domain (termed FALL-39). However, only a year later stated that the matured AMP, now called LL-37, is in reality two amino acids shorter than FALL-39.[20][21]

The cathelicidin family shares primary sequence homology with the cystatin[22] family of cysteine proteinase inhibitors, although amino acid residues thought to be important in such protease inhibition are usually lacking.

Non-human orthologs

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Cathelicidin peptides have been found in humans, monkeys, mice, rats, rabbits, guinea pigs, pandas, pigs, cattle, frogs, sheep, goats, chickens, horses and wallabies.[23] Antibodies to the human LL-37/hCAP-18 have been used to find cathelicidin-like compounds in a marsupial.[24] About 30 cathelicidin family members have been described in mammals, with only one (LL-37) found in humans.[4] Currently identified cathelicidin peptides include the following:[5]

  • Human: hCAP-18 (cleaved into LL-37)
  • Rhesus monkey: RL-37
  • Mice:CRAMP-1/2, (Cathelicidin-related Antimicrobial Peptide[25]
  • 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)[26]
  • Chickens: Four cathelicidins, fowlicidins 1,2,3 and cathelicidin Beta-1 [27]
  • Tasmanian Devil: Saha-CATH5 [28]
  • Salmonids: CATH1 and CATH2

Clinical significance

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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.[29] Antibiotics have been used in the past to treat rosacea, but antibiotics may only work because they inhibit some SCTEs.[30]

Lower plasma levels of human cathelicidin antimicrobial protein (hCAP18) appear to significantly increase the risk of death from infection in dialysis patients.[31] The production of cathelicidin is up-regulated by vitamin D.[32][33]

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.[34] In addition, SAAP-148 synergises with the repurposed antibiotic halicin against antibiotic-resistant bacteria and biofilms.[35]

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.[36] 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.[36]

LL-37 binds to the peptide Ab, which is associated with Alzheimer's disease. An imbalance between LL-37 and Ab may be a factor affecting AD-associated fibrils and plaques. Chronic, oral Porphyromonas gingivalis, and herpesvirus (HSV-1) infections may contribute to the progression of Alzheimer's dementia.[37][38]

Applications

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Research into the AMP family—particularly in regards to their mechanism of action—has been ongoing for nearly 20 years. Despite sustained interest, treatments derived or utilizing AMPs have not been widely adopted for clinical use for several reasons.[39] One, drug candidates from AMPs have a narrow window of bioavailability, because peptides are quickly broken down by proteases. Two, peptide drugs are more expensive than small molecule drugs to produce, which is problematic since peptide drugs must be given in large doses to counter rapid enzymatic breakdown. These qualities also limit routes of administration, typically to injection, infusion, or slow release therapy.[40]

See also

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References

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  1. ^ a b "UniProt". www.uniprot.org. Retrieved 8 February 2024.
  2. ^ "Entrez Gene: CAMP cathelicidin antimicrobial peptide".
  3. ^ Dürr U, Sudheendra U, Ramamoorthy, A (September 2006). "LL-37, the only human member of the cathelicidin family of antimicrobial peptides". Biochimica et Biophysica Acta (BBA) - Biomembranes. 1758 (9): 1408–1425. doi:10.1016/j.bbamem.2006.03.030. PMID 16716248.
  4. ^ a b c 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.
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  6. ^ Carman R, Simonian MR, Old JM, Jacques NA, Deane EM (2008). Immunohistochemistry using antibodies to the Cathelicidin LL37/hCAP18 in the tammar wallaby (Macropus eugenii). Tissue and Cell. 40(6), 459-466. DOI: 10.1016/j.tice.2008.05.002
  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.
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  16. ^ 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. (Retracted, see doi:10.1038/s41388-022-02567-5, PMID 36494433. If this is an intentional citation to a retracted paper, please replace {{retracted|...}} with {{retracted|...|intentional=yes}}.)
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  18. ^ 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.
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  20. ^ Agerberth B, Gunne H, Odeberg J, Kogner P, Boman HG, Gudmundsson GH (January 1995). "FALL-39, a putative human peptide antibiotic, is cysteine-free and expressed in bone marrow and testis". Proceedings of the National Academy of Sciences of the United States of America. 92 (1): 195–9. Bibcode:1995PNAS...92..195A. doi:10.1073/pnas.92.1.195. PMC 42844. PMID 7529412.
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  22. ^ 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.
  23. ^ Carman RL, Old JM, Baker M, Jacques NA, Deane EM (2009). Identification and expression of a novel marsupial cathelicidin from the tammar wallaby (Macropus eugenii). Veterinary Immunology and Immunopathology. 127(3-4), 269-276. DOI: 10.1016/j.vetimm.2008.10.319
  24. ^ Carman RL, Simonian MR, Old JM, Jacques NA, Deane EM (December 2008). "Immunohistochemistry using antibodies to the cathelicidin LL37/hCAP18 in the tammar wallaby, Macropus eugenii". Tissue & Cell. 40 (6): 459–466. doi:10.1016/j.tice.2008.05.002. PMID 18597803.
  25. ^ 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.
  26. ^ 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.
  27. ^ 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.
  28. ^ 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.
  29. ^ 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.
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  31. ^ 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.
  32. ^ 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.
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  34. ^ 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.
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  37. ^ Kanagasingam S, Chukkapalli SS, Welbury R, Singhrao SK (December 2020). "Porphyromonas gingivalis is a Strong Risk Factor for Alzheimer's Disease". Journal of Alzheimer's Disease Reports. 4 (1): 501–511. doi:10.3233/ADR-200250. PMC 7835991. PMID 33532698.
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Further reading

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