title: Cationic Antimicrobial Peptides Derived from Crocodylus siamensis Leukocyte Extract, Revealing Anticancer Activity and Apoptotic Induction on Human Cervical Cancer Cells.
abstract: Known antimicrobial peptides KT2 and RT2 as well as the novel RP9 derived from the leukocyte extract of the freshwater crocodile (Crocodylus siamensis) were used to evaluate the ability in killing human cervical cancer cells. RP9 in the extract was purified by a combination of anion exchange column and reversed-phase HPLC, and its sequence was analyzed by mass spectrometry. The novel peptide could inhibit Gram-negative Vibrio cholerae (clinical isolation) and Gram-positive Bacillus pumilus TISTR 905, and its MIC values were 61.2 µM. From scanning electron microscopy, the peptide was seen to affect bacterial surfaces directly. KT2 and RT2, which are designed antimicrobial peptides using the C. siamensis Leucrocin I template, as well as RP9 were chemically synthesized for investigation of anticancer activity. By Sulforhodamine B colorimetric assay, these antimicrobial peptides could inhibit both HeLa and CaSki cancer cell lines. The IC50 values of KT2 and RT2 for HeLa and CaSki cells showed 28.7-53.4 and 17.3-30.8 µM, while those of RP9 were 126.2 and 168.3 µM, respectively. Additionally, the best candidate peptides KT2 and RT2 were used to determine the apoptotic induction on cancer cells by human apoptosis array assay. As a result, KT2 and RT2 were observed to induce apoptotic cell death in HeLa cells. Therefore, these results indicate that KT2 and RT2 with antimicrobial activity have a highly potent ability to kill human cervical cancer cells.
authors.affiliation: Protein and Proteomics Research Center for Commercial and Industrial Purposes (ProCCI), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.|Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
authors.forename: Tinnakorn
authors.initials: T
authors.lastname: Theansungnoen
authors.affiliation: Protein and Proteomics Research Center for Commercial and Industrial Purposes (ProCCI), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.|Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
authors.forename: Surachai
authors.initials: S
authors.lastname: Maijaroen
authors.affiliation: Protein and Proteomics Research Center for Commercial and Industrial Purposes (ProCCI), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.|Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
authors.forename: Nisachon
authors.initials: N
authors.lastname: Jangpromma
authors.affiliation: Protein and Proteomics Research Center for Commercial and Industrial Purposes (ProCCI), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.
authors.forename: Nualyai
authors.initials: N
authors.lastname: Yaraksa
authors.affiliation: Protein and Proteomics Research Center for Commercial and Industrial Purposes (ProCCI), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand.|Division of Pharmacognosy and Toxicology, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand.
authors.forename: Sakda
authors.initials: S
authors.lastname: Daduang
authors.affiliation: Sriracha Moda Co., Ltd., Chon Buri, 20110, Thailand.
authors.forename: Theeranan
authors.initials: T
authors.lastname: Temsiripong
authors.affiliation: Department of Clinical Chemistry, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, 40002, Thailand.
authors.forename: Jureerut
authors.initials: J
authors.lastname: Daduang
authors.affiliation: Protein and Proteomics Research Center for Commercial and Industrial Purposes (ProCCI), Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand. somkly@kku.ac.th.|Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand. somkly@kku.ac.th.
authors.forename: Sompong
authors.initials: S
authors.lastname: Klaynongsruang
mesh_terms: D000489:Alligators and Crocodiles / Q000097:blood; D000595:Amino Acid Sequence; D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D023181:Antimicrobial Cationic Peptides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D001419:Bacteria / Q000187:drug effects; D001424:Bacterial Infections / Q000188:drug therapy; D002457:Cell Extracts / Q000737:chemistry; D045744:Cell Line, Tumor; D002584:Cervix Uteri / Q000187:drug effects / Q000473:pathology; D005260:Female; D006367:HeLa Cells; D006461:Hemolysis / Q000187:drug effects; D006801:Humans; D007962:Leukocytes / Q000737:chemistry*; D002583:Uterine Cervical Neoplasms / Q000188:drug therapy* / Q000473:pathology
chemical_list: D000900:Anti-Bacterial Agents; D023181:Antimicrobial Cationic Peptides; D000970:Antineoplastic Agents; D002457:Cell Extracts
keywords: Anticancer activity; Antimicrobial activity; Apoptosis; Human cervical cancer; KT2 and RT2; RP9