Valerie R. Wiersma, Marco de Bruyn, Robert J

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The Glycan-Binding Protein Galectin-9 Has Direct Apoptotic Activity toward Melanoma Cells  Valerie R. Wiersma, Marco de Bruyn, Robert J. van Ginkel, Emily Sigar, Mitsuomi Hirashima, Toshiro Niki, Nozomu Nishi, Douwe F. Samplonius, Wijnand Helfrich, Edwin Bremer  Journal of Investigative Dermatology  Volume 132, Issue 9, Pages 2302-2305 (September 2012) DOI: 10.1038/jid.2012.133 Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Galectin-9 (Gal-9(0)) rapidly induces apoptosis in serum-free conditions. (a). Adhesion of B16F10 and a panel of human melanoma cell lines to collagen-I-coated wells is inhibited by recombinant Gal-9. In brief, 3 × 104 melanoma cells were added to collagen-I-coated plates and incubated for 1h at 37°C in the presence or absence of 100nM Gal-9(0). Subsequently, wells were washed twice with phosphate-buffered saline, and the number of adhered cells was counted in three wells per condition. Experiments were performed in triplicates. (b) Light microscopic pictures of B16F10 cells adhered to collagen-I-coated wells in untreated conditions and upon treatment with 100nM Gal-9(0). Bar=100μm. (c) Cells were treated for 1h with 100nM Gal-9(0) and subsequently analyzed for the early apoptotic event of phosphatidyl serine (PS) exposure using flow cytometric Annexin-V-FITC staining. The following cells were analyzed: B16F10, A2058, Sk-MEL-28, MM-RU, MM-WK, MM-AN, MM-EP, A375M, primary (prim.) patient–derived melanoma cells (n=1), and primary human melanocytes (n=1). (d) B16F10, Sk-MEL-28, A2058, and MM-RU were treated with Gal-9(0) with or without alpha-lactose or sucrose. (e) Sk-MEL-28, A2058, A375M, MM-AN, and MM-RU were treated with 100nM Gal-9(0) for 5, 10, 15, and 20minutes. Graph represents the average PS exposure detected in all five cell lines from three separate experiments. (f) MM-RU cells were treated with various Gal-9(0) concentrations (ranging from 5 to 200nM), after which cells were simultaneously assessed for collagen-I adhesion and PS exposure. Statistical analysis was performed by linear regression, yielding an r2 of 0.6497. In all cell death assays, cell death was assessed by flow cytometry using Annexin-V-FITC, which measures the early apoptotic exposure of PS on the outer leaflet of the cell membrane. Journal of Investigative Dermatology 2012 132, 2302-2305DOI: (10.1038/jid.2012.133) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Cell death induction by galectin-9 (Gal-9(0)) is blocked by fetal calf serum (FCS) but not by human pooled plasma. (a) A panel of melanoma cells and primary patient–derived melanoma cells (n=1) were treated for 1h with Gal-9(0) in standard cell death conditions (with 10% FCS). (b) A2058 cells were treated with 100nM Gal-9(0) in the presence of increasing concentrations of FCS and analyzed for the percentage of cells with phosphatidyl serine (PS) exposure. (c) A2058 cells were incubated on ice with 100nM biotinylated Gal-9(0) in the presence of increasing concentrations of FCS. Cell surface binding of Gal-9(0)-biotin was evaluated using Streptavidin-Alexa488 by flow cytometry. (d) A2058 cells were treated with 100nM Gal-9(0) in serum-free (SF) conditions or in the presence of 10% FCS, 10% dialyzed FCS (dFCS), heat-inactivated FCS (hiFCS), or human pooled plasma (HPP). (e) A panel of melanoma cell lines and primary patient–derived melanoma cells (n=1) were treated with 100nM Gal-9(0) in SF conditions or in the presence of 10% HPP. In all assays, cell death was assessed by flow cytometry using Annexin-V (AnneV)-FITC. All experiments were performed in triplicates. Journal of Investigative Dermatology 2012 132, 2302-2305DOI: (10.1038/jid.2012.133) Copyright © 2012 The Society for Investigative Dermatology, Inc Terms and Conditions