Expression and Function of Keratinocyte Growth Factor and Activin in Skin Morphogenesis and Cutaneous Wound Repair  Hans-Dietmar Beer, Marcus G. Gassmann,

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Expression and Function of Keratinocyte Growth Factor and Activin in Skin Morphogenesis and Cutaneous Wound Repair  Hans-Dietmar Beer, Marcus G. Gassmann, Barbara Munz, Heike Steiling, Felix Engelhardt, Kerstin Bleuel, Sabine Werner  Journal of Investigative Dermatology Symposium Proceedings  Volume 5, Issue 1, Pages 34-39 (December 2000) DOI: 10.1046/j.1087-0024.2000.00009.x Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Expression of KGF (FGF-7), FGF-10, and FGFR2-IIIb (KGF receptor) in adult mouse tissues. Total cellular RNA was isolated from adult mouse tissues; 20 μg RNA was analyzed for the expression of KGF (FGF-7), FGF-10, and FGFR2-IIIb by RNase protection assay; 20 μg tRNA were used as a negative control; 1000 cpm of the hybridization probes were loaded in the lanes labeled "probe" and used as a size marker. The same set of RNA was used for all protection assays. Reprinted fromBeer et al. (1997) and from Beer et al. (J Biol Chem 275:16091–16097 2000) with permission from Stockton Press and from the American Society for Biochemistry of Molecular Biology. Journal of Investigative Dermatology Symposium Proceedings 2000 5, 34-39DOI: (10.1046/j.1087-0024.2000.00009.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Overview of KGF-regulated genes. The products of the genes shown on the right-hand side are likely to mediate the direct effects of KGF, whereas those on the left-hand side could be responsible for the indirect effects of KGF on mesenchymal cells. Journal of Investigative Dermatology Symposium Proceedings 2000 5, 34-39DOI: (10.1046/j.1087-0024.2000.00009.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Increased expression of HPRT by KGF in vitro and by cutaneous injury in vivo. (A) KGF-regulated expression of HPRT in HaCaT keratinocytes. Quiescent HaCaT keratinoytes were incubated with KGF for different time periods as indicated; 20 μg total cellular RNA were analyzed for the expression of HPRT; 20 μg tRNA were used as a negative control; 1000 cpm of the different hybridization probe was loaded in the lane labeled ‘‘probe’' and used as a size marker. (B) Expression of HPRT during cutaneous wound repair in mice. Full-thickness excisional wounds were generated on the back of BALB/C mice. Mice were sacrificed at different time points after injury. The complete wounds were isolated and used for RNA isolation; 20 μg total cellular RNA from normal and wounded skin were analyzed by RNase protection assay for the expression of HPRT; 20 μg tRNA were used as a negative control; 1000 cpm of the hybridization probe was loaded in the lane labeled ‘‘probe’' and used as a size marker. (C) Expression of HPRT in 5 day full-thickness excisional wounds. Frozen sections from the middle of full-thickness excisional wounds were hybridized with a 35S-labeled antisense riboprobe complementary to the murine HPRT. Scale bar: 1 μm. Signals appear as white dots in the dark field survey. ES, Eschar; HE, hyperproliferative epithelium; G, granulation tissue. The figure has been adopted fromGassmann et al. (1999), with permission from Stockton Press. Journal of Investigative Dermatology Symposium Proceedings 2000 5, 34-39DOI: (10.1046/j.1087-0024.2000.00009.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Effect of KGF on the expression of enzymes involved in the detoxification of reactive oxygen species. Quiescent HaCaT keratinocytes were treated with KGF for different time periods as indicated; 20 μg RNA isolated from these cells were analyzed by RNase protection assay for the expression of the nonselenium glutathione peroxidase (nsGPx), the phospholipid hydroperoxide glutathione peroxidase (PhGPx), catalase (CAT), the Mn-dependent superoxide dismutase (Mn-SOD), and the Cu/Zn-dependent superoxide dismutase (Cu/Zn-SOD); 20 μg tRNA were used as a negative control; 1000 cpm of the hybridization probes were loaded in the lanes labeled ‘‘probe’' and used as a size marker. The same set of RNA was used for all protection assays. The RNase protection assay showing nsGPx expression was adopted fromFrank et al. (1997), with permission from Stockton Press. Journal of Investigative Dermatology Symposium Proceedings 2000 5, 34-39DOI: (10.1046/j.1087-0024.2000.00009.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Expression of the basal keratin 14 in the tail skin of normal and activin-overexpressing mice. Six micrometer frozen sections were stained with a monospecific antiserum directed against keratin 14 and a rhodamine-coupled secondary antibody. Note the severe hyperthickening of the epidermis of the transgenic mice (A) and the strong expression of keratin 14 in basal cells of the epidermis as well as in outer root sheath keratinocytes of the hair follicles of normal (B) and activin-overexpressing mice (A). Journal of Investigative Dermatology Symposium Proceedings 2000 5, 34-39DOI: (10.1046/j.1087-0024.2000.00009.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions