Serum Response Factor Controls Transcriptional Network Regulating Epidermal Function and Hair Follicle Morphogenesis  Congxing Lin, Anna Hindes, Carole.

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Serum Response Factor Controls Transcriptional Network Regulating Epidermal Function and Hair Follicle Morphogenesis  Congxing Lin, Anna Hindes, Carole J. Burns, Aaron C. Koppel, Alexi Kiss, Yan Yin, Liang Ma, Miroslav Blumenberg, Denis Khnykin, Frode L. Jahnsen, Seth D. Crosby, Narendrakumar Ramanan, Tatiana Efimova  Journal of Investigative Dermatology  Volume 133, Issue 3, Pages 608-617 (March 2013) DOI: 10.1038/jid.2012.378 Copyright © 2013 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Phenotypic and biochemical changes in Srf-cKO epidermis (epi). (a) Postnatal day 0 (P0) wild-type (wt) and mutant (mt) mice. (b) EOB phenotype, lack of whiskers, and abnormal hind limb digits in mutants. E18.5, embryonic day 18.5. (c) Acidic X-gal dye penetration assay. (d) Dehydration assay. Steady weight loss exhibited by mutants but not by wt control littermates, suggesting defective “inside-to-outside” barrier in mutants. (e) Immunoblot confirms serum response factor (SRF) ablation in mutant epidermis. Tubulin immunoblot verifies equal protein loading. (f) H&E and (g–m) immunofluorescent staining of E17.5 wt and mt littermate skin sections, using the indicated antibodies, color coded according to secondary antibodies. Secondary antibody alone was used as a negative control for each primary antibody (not shown). Nuclei were counterstained with Hoechst dye. βcat, β-catenin; der, dermis; Intβ4, integrin β4; Ker, keratin; Lor, loricrin. Bar=50μm. Journal of Investigative Dermatology 2013 133, 608-617DOI: (10.1038/jid.2012.378) Copyright © 2013 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Abnormal expression of keratin 10, involucrin, and p63 in the epidermis of Srf-cKO mice. Immunohistochemical analysis of wild-type (wt) control and SRF-null mutant (mt) postnatal day 1 (P1) mouse skin sections for (a) keratin 10 and (b) involucrin expression. Positive staining is shown by brown staining. Secondary antibody alone was used as a control (No 1° Ab). Original magnification, × 40. (c) Immunofluorescent staining using antibodies specific for the indicated proteins in wt control and SRF-null mt P1 mouse skin sections. Secondary antibody alone was used as a negative control for each primary antibody (not shown). Nuclei were counterstained with Hoechst dye (DNA). Bar=50μm. Journal of Investigative Dermatology 2013 133, 608-617DOI: (10.1038/jid.2012.378) Copyright © 2013 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Aberrant patterns of expression of the AP1 family members Fra-1, JunB and c-Jun, and C/EBPα transcription factors in epidermis (epi) lacking serum response factor. Immunofluorescence (upper panel) and immunohistochemical analyses of wild-type (wt) and Srf-cKO mutant (mt) E18.5 mouse skin sections for the expression of the indicated transcription factors. Nuclei were counterstained with Hoechst dye (upper panel). Positive staining for JunB, c-Jun, and C/EBPα is shown by brown staining. Secondary antibody alone was used as a negative control for each primary antibody (not shown). der, dermis. Bar=50μm. Journal of Investigative Dermatology 2013 133, 608-617DOI: (10.1038/jid.2012.378) Copyright © 2013 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Engrafted serum response factor–null skin lacks hair but exhibits normal epidermal architecture and proper expression of differentiation markers. Wild-type (wt) and mutant (mt) E17.5 skins were engrafted onto the backs of nude mice. (a) General appearance of the grafts at the indicated days post grafting. (b) Histological and immunohistochemical analyses, using the indicated antibodies, of the 97-day (97-d) grafts. Positive staining is shown by brown staining. (c) Immunofluorescence analysis of TSLP expression. Secondary antibody alone was used as a negative control in both b and c (No 1° Ab). (d) TUNEL assay reveals no TUNEL-positive cells in the 97-d wt or mt grafts. In contrast, E17.5 mt sample used as a positive control shows numerous TUNEL-positive nuclei in epidermis. Nuclei were counterstained with Hoechst dye. d, days; Inv, involucrin; Ker, keratin; Lor, loricrin. (b–d) Bar=50μm. Journal of Investigative Dermatology 2013 133, 608-617DOI: (10.1038/jid.2012.378) Copyright © 2013 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Changes in the expression of selected genes in serum response factor (SRF)–null epidermis. Selected genes (a) upregulated or (b) downregulated in mutant E17.5 epidermis, grouped into functional categories essential for skin barrier function. Numbers in parenthesis correspond to fold (a) increase or (b) decrease in Srf-cKO mutant versus wild-type (wt) control epidermis. P-value is less than 0.1. (c) Heat map shows both downregulation and upregulation of SRF target CArG-containing genes. A summary of SRF target genes, containing known and novel CArG sequences, generated using bioinformatics screen was published by Sun et al., 2006. About 60% of the putative SRF target genes have been functionally validated in that study. *Known CArG-containing SRF target genes, as reported in the aforementioned study. Journal of Investigative Dermatology 2013 133, 608-617DOI: (10.1038/jid.2012.378) Copyright © 2013 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 6 Serum response factor(SRF)–null E17.5 epidermis exhibits reduced expression of Lef1, Ptch1, and Shh. (a) Changes in the expression of selected genes linked to hair follicle morphogenesis in SRF-null E17.5 mouse epidermis. Numbers in parenthesis correspond to fold change in Srf-cKO mutant (mt) versus wild-type (wt) control epidermis; negative values represent fold decrease. Fold change>1.5, P-value cutoff: 0.1. (b, d, and e) 35S in situ hybridization on wt and mt E17.5 mouse skin sections using indicated probes. Nuclei were counterstained with Hoechst dye (blue). (c) Immunohistochemical analysis of wt and mt E17.5 mouse skin sections for Lef1 expression. Positive staining is shown by brown staining. Secondary antibody alone was used as a negative control for each primary antibody (not shown). (b–e) Bar=200μm. Journal of Investigative Dermatology 2013 133, 608-617DOI: (10.1038/jid.2012.378) Copyright © 2013 The Society for Investigative Dermatology, Inc Terms and Conditions