Histologic and Cell Kinetic Studies of Hair Loss and Subsequent Recovery Process of Human Scalp Hair Follicles Grafted onto Severe Combined Immunodeficient.

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Histologic and Cell Kinetic Studies of Hair Loss and Subsequent Recovery Process of Human Scalp Hair Follicles Grafted onto Severe Combined Immunodeficient Mice Takashi Kazama, Masaaki Ito, Yuko Katakai, Naoko Yamaguchi, Yoshito Ueyama Journal of Investigative Dermatology Volume 115, Issue 2, Pages 200-206 (August 2000) DOI: 10.1046/j.1523-1747.2000.00063.x Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 A macrograph of an isolated human scalp hair follicle for transplantation. A small amount of the dermal connective tissue remains around the anagen hair follicle. Therefore, the connective tissue sheath is preserved. Scale bar: 1 mm. Journal of Investigative Dermatology 2000 115, 200-206DOI: (10.1046/j.1523-1747.2000.00063.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Histologic findings of grafted hair follicles. Hematoxylin and eosin stain. (a, b) Early degeneration stage (day 7). The upper part of the hair shaft has been artificially lost during sectioning. The outline of the hair follicle remains to be smooth. The hair bulb shows atrophy, and differentiation into either a hair shaft or an IRS is not observed. Not only reduction of melanin content but also melanin incontinence and clustering are observed at the lower end. (c, d) Early degeneration stage (day 20). A thick and corrugated vitreous membrane is shown around the lower part of the follicle. The lower portion of the ORS shows an irregular outline. The bottom end of the hair shaft is tapered in shape. (e, f) Late degeneration stage (day 30). The dermal papilla exists in contact with the follicular bottom, which keeps a bulb-like shape. In the mid part of the follicle many epithelial protuberances are observed. Vitreous membrane around the follicular bottom has disappeared. Melanin incontinence and apoptotic cells are still observed. (g, h) Stable growth stage (day 70). The regenerated hair follicle is histologically the same as a normal anagen hair follicle except for several protuberances in the upper portion. Scale bars: (a, c, g) 250 μm; (b, d, e, h) 50 μm; (f) 10 μm. Journal of Investigative Dermatology 2000 115, 200-206DOI: (10.1046/j.1523-1747.2000.00063.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Immunohistologic findings of grafted hair follicles. (a–c, e, g, h) K19 staining. (d, f) BrdU staining. Detection of antibody reaction was accomplished by streptavidin–biotin-peroxidase complex technique using diaminobenzidine (brown: a–e, g, h) or diaminobenzidine with nickel and cobalt (brownish black: f) as a substrate. (a, b) Early degeneration stage (day 7). In the lower portion of the follicle the basal and the suprabasal layers express K19, whereas in the mid portion only the outermost cell layer expresses the keratin. (c, d) Early regeneration stage (day 40). K19 expression is decreased at the lower end (c). In the same hair follicle BrdU-labeled cells are not detected in the epithelial cells adjacent to the dermal papilla (d). (e, f) Late regeneration stage (day 40). K19 expression is decreased at the lower end (e). In this hair follicle several BrdU-labeled cells are detected in the epithelial cells adjacent to the dermal papilla (arrowheads) (f). (g, h) stable growth stage (day 70). K19 expression is restricted in the basal layer of the epithelial protuberances in the upper part of the follicle. Scale bars: (a, g) 200 μm; (b, h) 50 μm; (c–f) 20 μm. Journal of Investigative Dermatology 2000 115, 200-206DOI: (10.1046/j.1523-1747.2000.00063.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Scanning electron micrograph of a shed hair shaft. The proximal end of the hair shaft is constricted and broken. Scale bar: 100 μm. Journal of Investigative Dermatology 2000 115, 200-206DOI: (10.1046/j.1523-1747.2000.00063.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Transmission electron micrograph of the lower part of a grafted hair follicle (day 40). Phagocytosed apoptotic bodies are seen. Scale bar: 2 μm. Journal of Investigative Dermatology 2000 115, 200-206DOI: (10.1046/j.1523-1747.2000.00063.x) Copyright © 2000 The Society for Investigative Dermatology, Inc Terms and Conditions