Cdc42 Inhibits ERK-Mediated Collagenase-1 (MMP-1) Expression in Collagen-Activated Human Keratinocytes  Maryam G. Rohani, Brian K. Pilcher, Peter Chen,

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Cdc42 Inhibits ERK-Mediated Collagenase-1 (MMP-1) Expression in Collagen-Activated Human Keratinocytes  Maryam G. Rohani, Brian K. Pilcher, Peter Chen, William C. Parks  Journal of Investigative Dermatology  Volume 134, Issue 5, Pages 1230-1237 (May 2014) DOI: 10.1038/jid.2013.499 Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Keratinocyte ligation to fibrillar type I collagen induced phosphorylation of extracellular signal–regulated kinase (ERK) and p38 mitogen-activated protein kinase but not of c-Jun N-terminal kinase (JNK). Primary keratinocytes were plated on fibrillar type I collagen, and cell lysates were harvested at the designated time points. The 0-minute cells were keratinocytes sampled before plating on collagen. Phosphorylated (p-) and total ERK, p38, and JNK were visualized by immunoblotting using specific antibodies. Results are representative of three independent experiments with keratinocytes from three different batches of cells. SAPK, stress-activated protein kinase. Journal of Investigative Dermatology 2014 134, 1230-1237DOI: (10.1038/jid.2013.499) Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Collagen induction of matrix metalloproteinase 1 (MMP-1) by keratinocytes was mediated by extracellular signal–regulated kinase (ERK) signaling. (a) Keratinocytes were pretreated for 2hours with control medium, PD98059 (10μM; ERK inhibitor), or SB203580 (10μM; p38 inhibitor). Then, cells were plated on type I collagen for 48hours. Equal volumes of conditioned medium were resolved by SDS-PAGE, and MMP-1 was detected by immunoblotting. The panel is representative of four independent experiments. (b) Keratinocytes cultured on collagen were transfected at 60% confluence with a 2.2-kb human MMP1 promoter construct containing the luciferase reporter gene and a construct containing the Renilla luciferase gene for normalization of transfection efficiency. After 16hours, keratinocytes were treated with vehicle control, U0126 (10μM; ERK inhibitor), SB203580 (10μM), or curcumin (10μM; c-Jun N-terminal kinase inhibitor). This panel is representative of reproducible experiments. (c) Keratinocytes were pretreated for 2hours with increasing concentrations of U0126, or its inactive analog U0124 (0.1–10μM), and then plated on collagen-coated plate and incubated for 24hours in the presence of inhibitors. Expression of MMP1 was quantified using the quantitative reverse transcriptase–PCR method. (*P<0.05, two-way analysis of variance followed by the Bonferroni test, n=3). Journal of Investigative Dermatology 2014 134, 1230-1237DOI: (10.1038/jid.2013.499) Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Keratinocyte migration across type I collagen required extracellular signal–regulated kinase (ERK) signaling, and its blocking inhibited keratinocyte matrix metalloproteinase 1 (MMP-1) and migration in ex vivo wounded epidermis. (a) Keratinocytes were pretreated for 2hours with ERK, p38, or c-Jun N-terminal kinase inhibitor (10μM). After incubation, cells were plated on a colloidal gold-type I collagen substratum and allowed to migrate for 16hours. Relative area migrated was quantified by averaging the total phagokinetic track area in four separate fields of view per treatment group. *P<0.05 by one-way analysis of variance followed by the Bonferroni post test, n=4. (b) Punch biopsies (5mm) of normal human skin from neonatal foreskin were cultured for 4 days in serum-free DMEM (formulated with 1.8mM Ca2+) in the presence of ERK inhibitor U0126 (10μM) or its inactive analog (U0124) in air–liquid interface in a 24-well transwell plate. The tissues were fixed and stained with hematoxylin and eosin. Arrowheads indicate the tip of the migrating epithelium. (c) Epithelium migration was quantified in samples from four different donors (*P<0.05, paired t-test). Journal of Investigative Dermatology 2014 134, 1230-1237DOI: (10.1038/jid.2013.499) Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Rho GTPase signaling modulated matrix metalloproteinase 1 (MMP-1) expression. Keratinocytes plated on type I collagen were transfected with small interfering RNA (siRNA) specific for RhoA, Rac-1, Cdc42, or non-silencing siRNA. After 48hours, cells were harvested, and (a) MMP-1 expression was determined by the quantitative reverse transcriptase–PCR (qRT-PCR) method; (b) MMP-1 secretion into the conditioned medium was assessed by ELISA. (c–e) Keratinocytes plated on type I collagen were pretreated for 2hours with the small-molecule inhibitors for (c) Cdc42, (d) ROCK (Rho-associated protein kinase), or (e) Rac-1. Cells were stimulated for 6hours with PMA (10ngml−1), and then RNA was isolated and processed for MMP-1 qRT-PCR. Data bars are mean±SEM of normalized samples to mock control (Lipofectamine 2000 (a, b) or untreated cells (c–e)). Nsi, non-silencing siRNA; Lip, Lipofectamine 2000. *P<0.05 by one-way analysis of variance followed by the Bonferroni post test, n=3. Journal of Investigative Dermatology 2014 134, 1230-1237DOI: (10.1038/jid.2013.499) Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Cdc42 inhibited matrix metalloproteinase 1 (MMP-1) expression via extracellular signal–regulated kinase (ERK) phosphorylation. (a) Cells pretreated with an ERK inhibitor (U0126; 0.5μM) or its inactive analog (U0124; 0.5μM) for 1hours at 4°C and were plated on collagen and incubated at 37°C for another hour before processing for immunoblots of active Cdc42, RhoA, or Rac-1. (b) Keratinocytes were incubated with a Cdc42 inhibitor (ML 141; 1–20μM) for 1hour at 4°C before collagen stimulation for 30minutes at 37°C and then processed for ERK and phospho-ERK immunoblots. (d) Keratinocytes plated on collagen or (e) stimulated with phorbol myristate acetate (PMA; 10ngml−1) were incubated with the inhibitors for ERK (U0126, 0.5μM) and Cdc42 (ML 141, 10μM). Expression of MMP-1 was assessed (c) in equal amount of conditioned medium with immunoblotting (after 48hours) or (d, e) in total mRNA with quantitative reverse transcriptase–PCR (after 8hours). Expression results were normalized to GAPDH (glyceraldehyde-3-phosphate dehydrogenase). Panels are representative of reproducible experiments. Journal of Investigative Dermatology 2014 134, 1230-1237DOI: (10.1038/jid.2013.499) Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 6 Cell–cell contact induces Cdc42 activation. (a) Keratinocytes were plated on collagen at low, medium, and high seeding densities (approximately 30, 50, and 70% confluent, respectively). After 24hours, cell lysates were harvested, and equal amounts were used for the Cdc42 activation assay. (b) Keratinocytes were plated at 30% confluence (low density) and allowed to proliferate to higher confluence for 48 and 72hours before harvesting for the Cdc42 activation assay. These are representative figures of reproducible results. Journal of Investigative Dermatology 2014 134, 1230-1237DOI: (10.1038/jid.2013.499) Copyright © 2014 The Society for Investigative Dermatology, Inc Terms and Conditions