Histone H4 Is a Major Component of the Antimicrobial Action of Human Sebocytes  Dong-Youn Lee, Chun-Ming Huang, Teruaki Nakatsuji, Diane Thiboutot, Sun-Ah.

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Histone H4 Is a Major Component of the Antimicrobial Action of Human Sebocytes  Dong-Youn Lee, Chun-Ming Huang, Teruaki Nakatsuji, Diane Thiboutot, Sun-Ah Kang, Marc Monestier, Richard L. Gallo  Journal of Investigative Dermatology  Volume 129, Issue 10, Pages 2489-2496 (October 2009) DOI: 10.1038/jid.2009.106 Copyright © 2009 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Purification of the antimicrobial activity from extracts of cultured sebocytes. (a) RP-HPLC was carried out to separate antimicrobial peptides from acid-soluble extracts of SEB-1 sebocytes. A plot of absorbance at 214nm is indicated on the left y axis and that of the concentration of acetonitrile used for elution on the right y axis. (b) The antimicrobial activity of the HPLC fractions was evaluated against S. aureus ΔmprF by solution-killing assay. Growth of bacterial colonies on agar after incubation with fractions obtained by RP-HPLC separation is shown with limiting dilutions from top to bottom. A single fraction (fraction 13) showed maximal antimicrobial activity. (c) HPLC fractions were subjected to SDS-PAGE and stained with Coomassie's blue. Arrow in the active fraction indicates a unique protein band that was further analyzed by mass spectrometry. Journal of Investigative Dermatology 2009 129, 2489-2496DOI: (10.1038/jid.2009.106) Copyright © 2009 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Identification of histone H4 in antimicrobial fractions purified from cultured sebocytes. (a) Western blot analysis with anti-histone antibody (BWA3, specific for histones H2A and H4) was carried out on HPLC fractions shown in Figure 1. In fraction 13, a single strong band was observed at 11kDa, which corresponded to the expected mass of histone H4. In fraction 12, a single strong band was observed at 13kDa, which corresponded to the expected mass of histone H2A. The lane marked as H4 was loaded with recombinant histone H4 used as a positive control. (b) Western blot analysis with the specific anti-acetyl histone H4 antibody showed a single band at 11kDa only in fraction 13. (c) Acid-soluble extracts of SEB-1 sebocytes and the culture medium containing SEB-1 sebocyte debris was evaluated by western blot with an anti-histone H2A and H4 antibody (BWA-3). Two bands were observed at 11 and 13kDa, which corresponded to histones H4 and H2A. H4, recombinant histone H4, was used as a positive control. Journal of Investigative Dermatology 2009 129, 2489-2496DOI: (10.1038/jid.2009.106) Copyright © 2009 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Recombinant histone H4 kills S. aureus and P. acnes. The antimicrobial activity of recombinant histone H4 was evaluated against S. aureus ΔmprF and P. acnes by the solution-killing assay. Bacteria were incubated for 3hours at 37°C in a 10mM sodium phosphate buffer (pH 6.5) containing 100mM NaCl. Recombinant histone H4 showed significant bactericidal activity against S. aureus ΔmprF at 25μgml-1 and above and against P. acnes at 12.5μgml-1 and above. Data shown are from triplicate determinations (**P<0.01; Student's t-test). Journal of Investigative Dermatology 2009 129, 2489-2496DOI: (10.1038/jid.2009.106) Copyright © 2009 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Recombinant histone H4 enhances the antimicrobial action of free fatty acids. The antimicrobial activity of histone H4 was evaluated in the presence of free fatty acids. Lauric and oleic acids (1.5μgml-1) synergistically exerted antimicrobial effects in combination with histone H4. Lauric acid (60μgml-1) exerted a stronger synergy with histone H4, but oleic acid at this concentration killed all bacteria. Data shown are from triplicate determinations (*P<0.05; Student's t-test). DMSO, dimethyl sulfoxide: LA, lauric acid: OA, oleic acid. Journal of Investigative Dermatology 2009 129, 2489-2496DOI: (10.1038/jid.2009.106) Copyright © 2009 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Neutralization of histone H4 in sebocyte extracts removes antimicrobial activity. BWA-3 neutralizing antibody was used to treat extracts of SEB-1 sebocytes. Addition of BWA-3 (400μgml-1) to the extracts of SEB-1 sebocytes significantly decreased antimicrobial activity against S. aureus ΔmprF compared with an equal concentration of IgG added to separate aliquots, or aliquots to which an equal volume of PBS was added as controls. Data shown are from triplicate determinations (*P<0.05; Student's t-test). Journal of Investigative Dermatology 2009 129, 2489-2496DOI: (10.1038/jid.2009.106) Copyright © 2009 The Society for Investigative Dermatology, Inc Terms and Conditions