Doxycycline Indirectly Inhibits Proteolytic Activation of Tryptic Kallikrein-Related Peptidases and Activation of Cathelicidin  Kimberly N. Kanada, Teruaki.

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Doxycycline Indirectly Inhibits Proteolytic Activation of Tryptic Kallikrein-Related Peptidases and Activation of Cathelicidin  Kimberly N. Kanada, Teruaki Nakatsuji, Richard L. Gallo  Journal of Investigative Dermatology  Volume 132, Issue 5, Pages 1435-1442 (May 2012) DOI: 10.1038/jid.2012.14 Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Doxycycline inhibits human cutaneous and normal human epidermal keratinocyte (NHEK) matrix metalloproteinase (MMP) activity in vitro. (a) Tape-strip samples were obtained from normal human facial skin, and total protein was extracted and normalized to a final protein concentration of 115μgml−1. MMP activity was measured in relative fluorescence units (RFU) using fluorogenic substrate (5μM) sensitive to most MMP enzymes (MMP-1, MMP-3, MMP-7, MMP-8, MMP-9, MMP-12, MMP-13, MMP-14, MMP-16, and MMP-20). Total-MMP activity of enzymatic extract treated with doxycycline (225μM) was decreased throughout incubation as compared with vehicle control. *P<0.05, **P<0.01 by Student's t-test, versus vehicle. (b) Doxycycline inhibition of total MMP activity, expressed as percent inhibition (%) at every hour, increased linearly throughout. (c) Incubating NHEK cell lysate with doxycycline (225μM) for 18hours significantly attenuated total MMP activity, showing direct inhibitory action. SB3CT (5μM), a selective inhibitor of MMP-2 and MMP-9, and GM6001 (25μM), a nonselective MMP inhibitor, were used as positive controls and showed similar effect. Vehicle control was 0.1% (v/v) DMSO. (d) Total MMP activity in NHEK-conditioned media (for secreted MMPs) was measured with fluorogenic substrate in the presence of calcium and zinc. All three inhibitors suppressed total MMP activity. (e) Cell lysate was assayed for MMP-2 activity in the presence of zinc ion required for its enzymatic activity as described in the Materials and Methods. (f) Conditioned medium was assayed for MMP-2 activity as in e. *P<0.05, **P <0.01, ***P<0.005 by Student's t-test, versus vehicle or control. Journal of Investigative Dermatology 2012 132, 1435-1442DOI: (10.1038/jid.2012.14) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Serine protease inhibitors inhibit cutaneous trypsin-like serine protease (TLSP) activity in vitro. (a) Tissue-purified kallikrein from porcine pancreas (50μgml−1) was incubated with and without 4-(2-Aminoethyl) benzenesulfonyl fluoride hydrochloride (AEBSF; 250μM), an irreversible serine protease inhibitor. AEBSF directly inhibited TLSP activity as compared with vehicle control as measured using a fluorogenic TLSP-specific substrate (2.5mM) to assay TLSP activity (relative fluorescence units (RFU)). (b) Tape-strip samples from normal facial skin were obtained, and total enzymes were extracted. Enzymatic extract was incubated with and without AEBSF to gauge the serine protease inhibitor's ability to attenuate cutaneous TLSP activity (RFU). Compared with vehicle control, AEBSF inhibited cutaneous TLSP activity throughout 20hours of incubation. (c) Tape-strip samples from normal facial skin were measured with EnzChek Protease Assay Kit (Invitrogen) in the absence of inhibitor (vehicle) and in the presence of aprotinin (50μgml−1), a competitive inhibitor for serine proteases. Aprotinin strongly attenuated cutaneous total protease activity. Journal of Investigative Dermatology 2012 132, 1435-1442DOI: (10.1038/jid.2012.14) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Doxycycline directly inhibits keratinocyte matrix metalloproteinase (MMP) but not trypsin-like serine protease (TLSP) activity. To examine the concentration at which doxycycline directly inhibits MMP and TLSP in normal human epidermal keratinocytes (NHEKs), MMP and TLSP activities in NHEK lysates were determined in the presence of various concentrations of doxycycline (0, 56.25, 112.5, 225, and 450μM). Cell lysate from NHEKs was measured for baseline catalysis of enzyme-specific substrates and then compared with catalysis in the presence of differing concentrations of doxycycline. Relative enzymatic activity is represented as percentage of no doxycycline control (100%). (a, b) Total-MMP catalysis is directly inhibited in a dose-dependent manner by direct addition of doxycycline to NHEK extracts. (c) In contrast to the inhibition of MMP activity, maximum inhibition of TLSP activity by doxycycline did not exceed 50% and was not significant at a concentration of doxycycline that was effective at inhibition of MMP activity (225μM). *P<0.05, ***P<0.005 by Student's t-test, versus vehicle or control. Journal of Investigative Dermatology 2012 132, 1435-1442DOI: (10.1038/jid.2012.14) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Doxycycline inhibits cellular and secreted trypsin-like serine protease (TLSP) activity of live keratinocytes. (a) To examine the activity of doxycycline on TLSP activity produced by live normal human epidermal keratinocytes (NHEKs), cells were cultured in media containing doxycycline (225μM) for 18hours. The matrix metalloproteinase (MMP) inhibitors SB3CT (5μM) and GM6001 (25μM) were used as positive controls for MMP inhibition. TLSP activity in cell lysate following culture with doxycycline was determined with TLSP-specific substrate (relative fluorescence units (RFU)). Doxycycline significantly attenuated cellular TLSP activity generated by live cells. Incubating cells with SB-3CT and GM6001 also significantly decreased cellular TLSP activity. (b) Secreted TLSP activity was similarly assayed in NHEK conditioned media. Doxycycline significantly decreased secreted TLSP activity. The inability of doxycycline to inhibit TLSP activity when directly added to enzyme extracts (Figure 3c) suggests that the inhibition induced in live cells is by an indirect mechanism and is related to the capacity to inhibit MMPs. *P<0.05, **P <0.01 by Student's t-test, versus vehicle or control. Journal of Investigative Dermatology 2012 132, 1435-1442DOI: (10.1038/jid.2012.14) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Normal human epidermal keratinocytes (NHEKs) pretreated with doxycycline display inhibited proteolytic processing of recombinant hCAP18. Equal amounts of recombinant cathelicidin precursor (rhCAP18, 1.525μg) were added as indicated to identical cultures of live NHEKs either untreated or pretreated overnight with doxycycline (225μM). Cleavage of hCAP18 was monitored by western blot analysis with anti-LL-37 antibody. (a) Cathelicidin detected in whole-cell extract and (b) cathelicidin remaining in overlying NHEK culture media. Lane 1, rhCAP18 alone+NHEK; lane 2, NHEK alone; lane 3, rhCAP18+doxycycline+NHEK; lane 4, doxycycline alone+NHEK. Anti-glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is shown as loading control. In the absence of doxycycline (lane 1), rhCAP18 is enzymatically processed as detected by generation of a band at the expected migration of LL-37. In the presence of doxycycline (lane 3), LL-37 is not seen in the cell-associated fraction, and a greater amount of rhCAP18 remains in the supernatant. Journal of Investigative Dermatology 2012 132, 1435-1442DOI: (10.1038/jid.2012.14) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions