Journal
ORAL ONCOLOGY
Volume 42, Issue 7, Pages 685-690Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.oraloncology.2005.11.005
Keywords
defensin; human neutrophil peptide-1; lactoferrin; oral squamous cell carcinoma; cytotoxicity; keratinocytes
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alpha-Defensin or human neutrophil peptide-1 (HNP1) is a neutrophil-derived antimicrobial peptide with cytotoxic effects towards cancer cells. Lactoferrin is also stored in human neutrophils and is a glycoprotein involved in mediating cytotoxicity towards tumour cells. This study investigated the sensitivity of normal oral keratinocyte and oral squamous cell carcinoma (OSCC) cells to HNP1 and lactoferrin in various combinations. A concentration of 100 mu g/ml HNP1 induced the most significant cytotoxic effect on both normal and OSCC cells. Lactoferrin (12.5, 25 and 250 mu g/ml) also significantly induced cell death in OSCC cells after 72 h. Of note, a combination of 10 mu g/ml HNP1 and 50 mu g/ml lactoferrin induced a differential effect, not observed with either concentration alone, which stimulated proliferation in normal cells, but induced cell death in OSCC cells throughout the study. These results indicate a potentially important co-operative role for HNP1 and lactoferrin in facilitating a selective cytotoxic effect on tumour cells. (c) 2005 Elsevier Ltd. All rights reserved.
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