Reproduction of Langerin/CD207 Traffic and Birbeck Granule Formation in a Human Cell Line Model  Ray McDermott, Huguette Bausinger, Dominique Fricker,

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Reproduction of Langerin/CD207 Traffic and Birbeck Granule Formation in a Human Cell Line Model  Ray McDermott, Huguette Bausinger, Dominique Fricker, Danièle Spehner, Fabienne Proamer, Dan Lipsker, Jean-Pierre Cazenave, Bruno Goud, Henri de la Salle, Jean Salamero, Daniel Hanau  Journal of Investigative Dermatology  Volume 123, Issue 1, Pages 72-77 (July 2004) DOI: 10.1111/j.0022-202X.2004.22728.x Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Localization of Langerin in Langerin+ M10-22E cells. Langerin localization was compared in freshly isolated Langerhans cells (A) and in the Langerin+ M10-22E cell line (B). Cells were labelled with the anti-Langerin mAb DCGM4, followed by an FITC-conjugated donkey anti-mouse antibody. The intensity of cell surface Langerin expression was also examined in both freshly isolated LC (C) and M10-22E cells (D) by flow cytometry. In these experiments, cells were labelled with the anti-Langerin mAb DCGM4, followed by an FITC-conjugated sheep anti-mouse antibody. To define the exact localization of Langerin in M10-22E cells, cells were incubated simultaneously with a goat anti-EEA1 antibody (E), a rabbit anti-Rab11 (F), and a mouse anti-Langerin (DCGM4) (E, F), before secondary staining with anti-goat FITC, anti-rabbit Cy5 and anti-mouse TRITC. In (G) and (H), the cells were incubated with anti-Langerin rabbit antiserum, secondarily labelled with anti-Rabbit-FITC before further incubation with the directly coupled antibodies CD63-Cy3 (G) or an anti-CD71/TfR mAb revealed by a TRITC-conjugated donkey anti-mouse (H). Inserts represent zoomed area from the perinuclear region. (E) and (F) are at the same magnification. Scale bars=10 μm. Journal of Investigative Dermatology 2004 123, 72-77DOI: (10.1111/j.0022-202X.2004.22728.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Internalization of the anti-Langerin mAb DCGM4 and ultrastructural characteristics of the M10-22E cells. Cells were incubated with the mouse anti-Langerin mAb DCGM4 for 1 h at either 4°C (A), 19.5°C (B), or 37°C (C). After fixation and permeabilization, cells were incubated with either donkey anti-mouse TRITC (A and B) or donkey anti-mouse FITC (C) before counter staining with rabbit anti-Rab11 followed by donkey anti-rabbit FITC (A) or donkey anti-rabbit TRITC (C), or with anti-EEA1 followed by donkey anti-goat FITC (B). (A), (B) and (C) are at the same magnification. Scale bar=10 μm. Under the electron microscope (D) Langerin+ M10-22E cells contain, in the pericentriolar area, numerous BG (arrows). Their central striation is clearly seen in the inferior left quadrant of (D). C, centriole; NU, nucleus. Scale bars=0.5 μm. Journal of Investigative Dermatology 2004 123, 72-77DOI: (10.1111/j.0022-202X.2004.22728.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Effect of drugs on the distribution of Langerin and Birbeck granules in M10-22E cells. (A, B) Cells were incubated in the absence of drugs (Ctrl) or in the presence of either cytochalasin D (Cyto D) or Brefeldin A (BFA) for 60 min at 37°C. Langerin surface expression was then measured by FACS scan. Similar results were obtained in five independent experiments. MFI, mean fluorescence intensity. (C–E) M10-22E cells were incubated with either cytochalasin D (C) or BFA (D, E), for 60 min at 37°C. Cells were then stained simultaneously with a rabbit anti-Rab11 antibody and either a mouse anti-Langerin (C, D) or a mouse anti-TfR (E) mAb, before labelling with anti-rabbit FITC and anti-mouse TRITC. Scale bars=10 μm. (F–H) Cells were incubated for 30 min at 37°C with cytochalasin D (10 μg per mL), before addition of gold-labelled anti-Langerin mAb for a further 15 min, still in the presence of cytochalasin D. As shown in the inset (F) gold particles accumulate in coated pits. “BG-like structures”, coated either throughout their entire length (F, G, arrowheads) or at their distal end (H, arrowheads), are also present. Note, in the upper left-hand portion of (G), the presence of a coat (arrowheads) along an “open-ended BG-like structure”. (I–L) Cells were incubated for 30 min at 37°C with BFA (10 μg per mL), before addition of HRP (10 mg per mL) for a further 30 min, still in the presence of BFA. Two elongated BG HRP+ (arrows), connected to a vacuolar HRP+ endosomal structure (star), are visible in (I) and (J), whereas in (K) and (L) two HRP+ BG (arrows) are seen, one of which is connected to a tubular HRP+ network. In images (I) and (J), as well as in (K) and (L), a single region is viewed from different angles (I, tilt +12°; J, tilt -12° and K, tilt +16°; L, tilt +32°). (G) and (H) are at the same magnification. Scale bars=0.5 μm. Journal of Investigative Dermatology 2004 123, 72-77DOI: (10.1111/j.0022-202X.2004.22728.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions