Fuz Controls the Morphogenesis and Differentiation of Hair Follicles through the Formation of Primary Cilia  Daisy Dai, Huiping Zhu, Bogdan Wlodarczyk,

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Fuz Controls the Morphogenesis and Differentiation of Hair Follicles through the Formation of Primary Cilia  Daisy Dai, Huiping Zhu, Bogdan Wlodarczyk, Lei Zhang, Li Li, Allen G. Li, Richard H. Finnell, Dennis R. Roop, Jiang Chen  Journal of Investigative Dermatology  Volume 131, Issue 2, Pages 302-310 (January 2011) DOI: 10.1038/jid.2010.306 Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Developing hair follicles in dorsal skins of wild-type and Fuz−/− embryos. (a–d) Representative hematoxylin and eosin staining of wild-type (a and c) and Fuz−/− (b and d) dorsal skins at E15.5 and E18.5, respectively. The number of hair follicles is significantly reduced in the Fuz−/− embryos at E18.5. Of note, hair follicles maintained A-P polarization in wild-type and Fuz−/− skins. (e) Quantification of E18.5 hair follicles in Fuz−/− and wild-type skin showed that the average number of hair follicles of Fuz−/− skin was about half that of wild-type littermates per microscopic field, irrespective of their differentiation stages (n=15, P<0.001). (f, g) Expression of P-cadherin (red) was localized to cells on the anterior side of hair germs in both wild-type and Fuz−/− skin. Krt14 (green) labeling shows keratinocytes in the epidermis and hair germ. (h, i) Expression of Vangl1 (red) remained polarized to the lateral membrane of cells of the epidermis and invaginating hair germ. DAPI (blue)-stained nucleus. DAPI, 46-diamidino-2-phenyl indole; A → P, anterior–posterior orientation; der, dermis; dp, dermal papilla; epi, epidermis; hg, hair germ. Scale bar=100μm in a–d; 50μm in f–i. Journal of Investigative Dermatology 2011 131, 302-310DOI: (10.1038/jid.2010.306) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Differentiation and proliferation of the epidermis and hair follicle. (a, b, d, and e) Immunofluorescence labeling of Krt14, Krt10, and Lor in the epidermis of Fuz−/− skin at E18.5 (d and e) revealed almost identical expression patterns of these epidermal differentiation markers as wild-type skin (a and b). (c and f) Immunofluorescence labeling of Krt71 (red), marker of Henle's layer of the inner root sheath, showed that some hair follicles have developed past stage 5 in wild-type embryos (c), whereas there was no evidence of differentiation in the most developmentally advanced dorsal skin hair follicles of Fuz−/− embryos (f). (g) Distribution of hair follicles in various developmental stages in wild-type (blue) and Fuz−/− (brown) dorsal skins at E18.5 (n=198 for wild type; n=126 for Fuz−/−). A majority (53%) of hair follicles in wild-type skin were in stage 4–5, whereas 50% of hair follicles in Fuz−/− skin were at stage 2 or below. (i–j) BrdU labeling of dorsal skin of wild-type (i) and Fuz−/− (j) embryos at E15.5. The interfollicular epidermis of both genotypes showed similar pattern of BrdU-positive cells. However, the number of BrdU-positive cells within the Fuz−/− hair germs was consistently fewer than that within wild-type hair germs. Arrows indicate early hair germs (hg). (h) Quantification of BrdU-positive cells in hair germs, n=7. DAPI, 46-diamidino-2-phenyl indole; A → P, anterior–posterior orientation. Scale bar=100μm. Journal of Investigative Dermatology 2011 131, 302-310DOI: (10.1038/jid.2010.306) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Primary cilia in skin of wild-type and Fuz−/− embryos. Primary cilia were labeled by Arl13b (green), basal bodies were labeled by γ-tubulin (red), and nuclei were labeled by DAPI (blue). (a, b) At E15.5, primary cilia were evident in both epidermal and dermal cells (open arrows) of wild-type skin (a). The number of cells containing primary cilia was reduced in both epidermal and dermal cells of Fuz−/− skin (b). Arrows indicate hair germs and arrowheads indicate dermal condensate. (c, d) Higher magnification of wild-type and Fuz−/− hair germs in (a) and (b). Arrows indicate cilia on cells in the hair germ and open arrows indicate cilia on cells comprising the dermal condensate. Of note, the majority of Fuz−/− germ cells and underlying dermal condensate did not have cilia but basal bodies were present. (e, f) At E18.5, cilia were evident and orientated toward the center of developing bulbous hair pegs in wild-type skin (e). Primary cilia were essentially absent from developing pegs of Fuz−/− skin (f). However, cells with severely truncated cilia exist (inlet in (f), indicated by arrows). Dotted lines highlight the epidermal–dermal boundary. DAPI, 46-diamidino-2-phenyl indole; der, dermis; epi, epidermis; hg, hair germ. Scale bar=100μm in (a, b, e and f), 25μm in (c and d). Journal of Investigative Dermatology 2011 131, 302-310DOI: (10.1038/jid.2010.306) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Expression of Shh-responsive genes in wild-type and Fuz−/− skin. (a, b) Transcription levels of Ptch1 (P=0.017) (a) and Gli2 (P=0.008) (b) were significantly reduced in skin of Fuz−/− embryos as compared with wild-type embryos at E15.5. (c) Transcription levels of Gli1 were significantly reduced in dorsal skin of Fuz−/− embryos as compared with wild-type embryos at E18.5 (P<0.001). (d–g) In situ hybridization of Ptch1 and Gli2 in wild-type (d and f) and Fuz−/− skins (e and g) of E18.5 embryos, respectively. Scale bar=50μm. Journal of Investigative Dermatology 2011 131, 302-310DOI: (10.1038/jid.2010.306) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Hair follicles failed to grow in Fuz−/− skin transplants. (a, b) Gross appearance of E18.5 embryonic back skin of wild-type (a) and Fuz−/− mice (b) grown on nude mice for 3 weeks. Note that long and dense hair grew on the wild-type skin transplant (a); the Fuz−/− skin transplant was pigmented, however, only a few short hair developed at the edge of the transplant (b). (c, d) Hematoxylin and eosin staining of wild-type (c) and Fuz−/− (d) skin transplants. Some hair follicles at the edge of Fuz−/− skin transplant (indicated by arrow) were able to develop further (d). (e and g) Cilia were labeled as in Figure 3. Most cells in the hair follicle of the wild-type skin transplant contained cilia (e) in comparison to only a small percentage of ciliated cells were present in the Fuz−/− skin transplants (g). (f and h) Expression of Krt14 (red) and Krt71 (green) in anagen hair follicles of wild-type (f) and Fuz−/− (h) skin transplants. (i and j) Expression of Krt14 (red) and Lor (green) in wild-type (i) and Fuz−/− (j) skin transplants. Scale bar=100μm in (c and d), 50μm in (f, h, i and j), 25μm in (e and g). Journal of Investigative Dermatology 2011 131, 302-310DOI: (10.1038/jid.2010.306) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 6 Hair follicle formation required the expression of Fuz in both epidermal and dermal cells. (a–c) Gross appearance of skin grafts reconstituted with wild-type keratinocytes and wild-type dermal cells (a), Fuz−/− keratinocytes and wild-type dermal cells (b), or wild-type keratinocytes and Fuz−/− dermal cells (c). (d–f) Hematoxylin and eosin staining of skin sections of corresponding grafts in (a–c). Note that the center of the skin grafts reconstituted with Fuz−/− cells (e and f) contained abnormally formed hair follicle structures. (g) Cilia were present on follicular and dermal papilla cells in hair follicles formed with wild-type cells. (h) Higher magnification of cropped area in (g). (i) Hair follicle-like structures that were formed by wild-type keratinocytes and Fuz−/− dermal cells only contained ciliated cells in the epidermal component, not the dermal component. (j) Dermal cells in skin grafts reconstituted by Fuz−/− keratinocytes and wild-type dermal cells contain cilia. (k) Cilia were only detectable in dermal papilla cells in a hair follicle formed by Fuz−/− keratinocytes and wild-type dermal cells. (l) Higher magnification of cropped area in (k). Dotted lines in k and l outline the dermal papillae. The antibodies used to detect primary cilia (Arl13b, green) and basal bodies (γ-tubulin, red) were the same as used in Figure 3. Cilia on epidermal cells are indicated by arrows; cilia in dermal cells are indicated by open arrows. Scale bar=500μm in (d-f), 25μm in (g-l). Journal of Investigative Dermatology 2011 131, 302-310DOI: (10.1038/jid.2010.306) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions