Signaling of Mechanical Stretch in Human Keratinocytes via MAP Kinases

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Signaling of Mechanical Stretch in Human Keratinocytes via MAP Kinases Stefan Kippenberger, August Bernd, Maike Guschel, Jutta Müller, Roland Kaufmann  Journal of Investigative Dermatology  Volume 114, Issue 3, Pages 408-412 (March 2000) DOI: 10.1046/j.1523-1747.2000.00915.x Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 The stretching device. Cells are grown in the rectangular box on top of the silicone sheets. (A) An overall view of the stretching device. The silicone chambers can be extended by using the right-hand lever. (B) On the left the chamber shows the relaxed state; on the right the chamber is stretched to 10% of the initial length. Journal of Investigative Dermatology 2000 114, 408-412DOI: (10.1046/j.1523-1747.2000.00915.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Mechanical stretch induces s-phases. Stretching of HaCaT cells for 24 h caused an upregulation of BrdU-positive cells to 239% as detected by a commercial BrdU ELISA. Each bar represents the mean of 12 independent experiments given as a percentage ±SD. The results show a high statistical significance (p <0.0001). Journal of Investigative Dermatology 2000 114, 408-412DOI: (10.1046/j.1523-1747.2000.00915.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Mechanical stretch activates MAP kinase ERK1/2 and SAPK/JNK. Time course of MAP kinase activation after a single 5 min stretch in HaCaT cell and normal human keratinocytes. (A) Activity of ERK1/2, represented by in vitro phosphorylation of Elk 1, peaks immediately after stimulation. The basal activity is restored already after 30 min. (B) p38 activation observed by a phospho specific p38 antibody (Thr180/182) shows no activity changes. (C) SAPK/JNK activity determined by in vitro phosphorylation of c-JUN during a time of 180 min. Maximum induction is at 60 min, with a moderate decline of activity. The blot shows representative results (n = 3). Journal of Investigative Dermatology 2000 114, 408-412DOI: (10.1046/j.1523-1747.2000.00915.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Effect of cytoskeleton-modifying drugs on ERK1/2 and SAPK/JNK activation in HaCaT cells. (A) Cells were incubated for 2 h with 0.05, 0.1, and 0.2 μg cytochalasin D per ml and tested for ERK1/2 activity and (B) SAPK/JNK activity. (C) Cells were incubated for 5 h with 5, 10, and 20 μg nocodazole per ml and tested for ERK1/2 activity and (D) SAPK/JNK activity. (E) Cells were incubated for 5 h with 25, 50, and 100 mM acrylamide and tested for ERK1/2 activity and (F) SAPK/JNK activity. The blot shows representative results (n = 3). Journal of Investigative Dermatology 2000 114, 408-412DOI: (10.1046/j.1523-1747.2000.00915.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Stretch-induced effects on ERK1/2 and SAPK/JNK activity in HaCaT cells after selective disruption of cytoskeletal elements. The controls are derived from stretched cells without any cytoskeleton manipulation at maximum activation in response to stretch. (A) Cytochalasin D (0.1 μg per ml) and acrylamide (50 mM) treatment shows no change of stretch-induced ERK1/2 activation. Nocodazole treatment (10 μg per ml) shows strong ERK1/2 activation (see also Figure 4c). (B) No alterations of SAPK/JNK activation in response to stretch are observed on treatment with cytochalasin D and acrylamide. Nocodazole causes SAPK/JNK activity upregulation (see also Figure 4d) (n = 3). Journal of Investigative Dermatology 2000 114, 408-412DOI: (10.1046/j.1523-1747.2000.00915.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 6 Effects of blocking β1 antibodies on cell morphology of HaCaT cells grown on silicone dishes. Cells were stained with methylene blue in order to enhance the contrast to the opaque cell support. The left half shows cells in the control state. On the right half the effect of incubation with β1-integrin antibodies is shown. Colonies become dissociated and cell-cell contacts are diminished. Journal of Investigative Dermatology 2000 114, 408-412DOI: (10.1046/j.1523-1747.2000.00915.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 7 Blocking of β1-integrins attenuates stretch-induced ERK1/2 activation. HaCaT cells were treated with functional blocking antibody directed towards β1-integrin subunits for 24 h. The characteristic activation of ERK1/2 induced by a single 5 min stretch was attenuated in cultures treated with β1-integrin antibodies (n = 3). Journal of Investigative Dermatology 2000 114, 408-412DOI: (10.1046/j.1523-1747.2000.00915.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions