Spleen Tyrosine Kinase Mediates EGFR Signaling to Regulate Keratinocyte Terminal Differentiation  Nan-Lin Wu, Duen-Yi Huang, Li-Fang Wang, Reiji Kannagi,

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Presentation transcript:

Spleen Tyrosine Kinase Mediates EGFR Signaling to Regulate Keratinocyte Terminal Differentiation  Nan-Lin Wu, Duen-Yi Huang, Li-Fang Wang, Reiji Kannagi, Yu-Ching Fan, Wan-Wan Lin  Journal of Investigative Dermatology  Volume 136, Issue 1, Pages 192-201 (January 2016) DOI: 10.1038/JID.2015.381 Copyright © 2015 The Authors Terms and Conditions

Figure 1 Syk phosphorylation and expression are suppressed during keratinocyte differentiation. (a–j) Immunohistochemical staining with phosphorylated Syk and Syk was performed. Two specimens from normal skin (a–d, i, j) and psoriatic skin (e–h) were analyzed. Phosphorylated Syk (a, c, e, g), Syk (b, d, f, h), anti-rabbit IgG (i), or anti-mouse IgG (j) were demonstrated. Black bar = 200 μm; white bar = 100 μm. (k) One or 4 days after subculture, NHEKs were collected for analysis of mRNA and protein expression by quantitative real-time PCR and Western blot, respectively. (l) NHEKs were treated with PMA and then Syk expression was analyzed as in (k). Quantification data of Syk protein expression are shown in the lower panels. The individual control was set as 1.0. Data were means from three independent experiments. *P < 0.05 (mean ± s.e.m. n = 3). Journal of Investigative Dermatology 2016 136, 192-201DOI: (10.1038/JID.2015.381) Copyright © 2015 The Authors Terms and Conditions

Figure 2 Syk inhibitors promote the expression of keratinocyte differentiation markers. (a) NHEKs were treated with Syk inhibitor, R406, for 12 and 24 hours. Then, the mRNA expression of differentiation markers were analyzed by quantitative real-time PCR. *P < 0.05 compared with DMSO-treated control group (mean ± s.e.m. n = 3) (b) NHEKs were treated with R406 of different concentrations for 30 hours. Then, protein expression of differentiation markers were determined by Western blot. (c) NHEKs were treated with R406 (1 μM) for 1, 3, and 5 days. Then cells were collected for the protein analysis by Western blot. (d) Similar to (c), NHEKs were treated with another Syk inhibitor, Bay 61-3606 (10 μM). Journal of Investigative Dermatology 2016 136, 192-201DOI: (10.1038/JID.2015.381) Copyright © 2015 The Authors Terms and Conditions

Figure 3 Knockdown of Syk promotes the expression of keratinocyte differentiation markers induced by cell confluence. (a–d) One and 4 days after knocking down Syk in NHEKs, cells were collected for the analysis of mRNA expression of differentiation markers including involucrin, TGase 1, keratin 10, and loricrin by quantitative real-time PCR. *P < 0.05 compared with siControl group (mean ± s.e.m. n = 3). (e) Similarly, 1, 3, and 5 days after knocking down Syk, protein expression of differentiation markers in groups of control siRNA (siCtrl) or Syk siRNA (siSyk) were determined by Western blotting. Journal of Investigative Dermatology 2016 136, 192-201DOI: (10.1038/JID.2015.381) Copyright © 2015 The Authors Terms and Conditions

Figure 4 Inhibition of Syk mildly reduces keratinocyte proliferation. (a) NHEKs were treated with Syk inhibitors, R406 and Bay 61-3606 (Bay), for 3 days, and then the relative cell number was determined by the crystal violet assay. (b) Ninety-six hours after knocking down Syk in NHEKs, relative cell numbers were measured by crystal violet assay. Syk expression was also shown. (c) NHEKs were treated with the Syk inhibitor, R406 (1 μM), for 3 days, and then cell cycle was analyzed by flow cytometry. (d) After starvation for 24 hours, NHEKs were treated with R406 (1 μM) or DMSO for 2 days and then cell proliferation was analyzed by BrdU incorporation assay. The group of NHEKs treated with DMSO cultured in media containing growth factors was represented as the control. *P < 0.05 compared with DMSO group (mean ± s.e.m. n = 3). Journal of Investigative Dermatology 2016 136, 192-201DOI: (10.1038/JID.2015.381) Copyright © 2015 The Authors Terms and Conditions

Figure 5 Syk is involved in EGFR-mediated signaling in keratinocytes. (a) Expression of EGFR and phosphorylated EGFR in NHEKs 1, 3, and 5 days after subculture was determined by Western blot. Lower panels were quantification data. The individual control was set as 1.0. Data were means from three independent experiments. *P < 0.05 (mean ± s.e.m. n = 3). (b) Keratinocyte differentiation markers were evaluated 1, 3, and 5 days after knocking down EGFR. (c) Twenty-four hours after knocking down EGFR, NHEKs were treated with EGF (50 ng/ml) after starvation for another 48 hours. (d) After pretreatment of gefitinib (10 μM) or PP2 (10 μM), Syk phosphorylation was determined. (e) After pretreatment of R406 (1 μM), EGFR phosphorylation was evaluated after EGF (50 ng/ml) treatment. Twenty-four hours after knocking down Syk, NHEKs were starved for another 48 hours and then treated similarly. Journal of Investigative Dermatology 2016 136, 192-201DOI: (10.1038/JID.2015.381) Copyright © 2015 The Authors Terms and Conditions

Figure 6 Interaction between Syk and EGFR in response to EGF stimulation. (a) NHEKs were stained with anti-EGFR (red, R), anti-Syk (green, G), and anti-Src (white, W) antibodies and with DAPI (blue) for nuclei. Individual and overlaid fluorescent images were shown after EGF stimulation. White bar = 20 μm. Arrowheads indicate the co-localization of Syk and EGFR. Data were representative of three independent experiments. Images were acquired using a Zeiss LSM780 confocal microscope. (b) After EGF (50 ng/ml) treatment, immunoprecipitation with EGFR antibody was performed to detect the interaction with Syk. (c) NHEKs treated with CaCl2 or PMA for 24 hours or without treatments (C) confluent NHEKs (Conf.) were subjected for immunoprecipitation with EGFR antibody to detect the interaction with Syk. Journal of Investigative Dermatology 2016 136, 192-201DOI: (10.1038/JID.2015.381) Copyright © 2015 The Authors Terms and Conditions