3,3′,4,4′,5,5′-Hexahydroxystilbene Impairs Melanoma Progression in a Metastatic Mouse Model  Verena Paulitschke, Nikolaus Schicher, Thomas Szekeres, Walter.

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3,3′,4,4′,5,5′-Hexahydroxystilbene Impairs Melanoma Progression in a Metastatic Mouse Model  Verena Paulitschke, Nikolaus Schicher, Thomas Szekeres, Walter Jäger, Leonilla Elbling, Angelika B. Riemer, Otto Scheiner, Golakoti Trimurtulu, Somepalli Venkateswarlu, Mario Mikula, Alexander Swoboda, Edda Fiebiger, Christopher Gerner, Hubert Pehamberger, Rainer Kunstfeld  Journal of Investigative Dermatology  Volume 130, Issue 6, Pages 1668-1679 (June 2010) DOI: 10.1038/jid.2009.376 Copyright © 2010 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 M8 is superior to resveratrol in inhibiting growth of the human melanoma cell line M24met. (a, b) Cell viability and proliferation assay. M24met human melanoma cells were treated with 3,3′,4,4′,5,5′-hexahydroxystilbene (M8), resveratrol (Res) (6.25, 12.5, 25, 50, and 100μM) or a solvent control (DMSO) for 24, 48, and 72hours. Points, mean of three independent experiments performed in quintuplicates; bars, SD. (c, d) M24met melanoma cells propagated in vivo were derived from two mice, isolated, and treated with the indicated concentrations of M8, resveratrol, or solvent control. Results from one representative cell line are shown. Journal of Investigative Dermatology 2010 130, 1668-1679DOI: (10.1038/jid.2009.376) Copyright © 2010 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 M8 induces G2/M arrest through inhibition of CDK-2 and induction of p21. (a, b) Cell-cycle analysis by flow cytometry using propidium iodide (PI)-stained M24met. Cells were treated for 24hours with 25μM 3,3′,4,4′,5,5′-hexahydroxystilbene (M8). (a) One representative DNA histogram of cell-cycle analysis of M24met treated with M8, with PI staining shown on the x axis and counts given on the y axis. (b) Three independent experiments were pooled and analyzed as a combined data set. (c) M8 leads to an induction of p21 over time. Immunoblotting of p21 after 4, 8, 24, and 48hours of M8 treatment with indicated concentrations (12.5–50μM). (d) Cell lysates of M24met melanoma cells were subjected to immunoblotting for CDK-2 after 48hours of M8 treatment. Journal of Investigative Dermatology 2010 130, 1668-1679DOI: (10.1038/jid.2009.376) Copyright © 2010 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 M8 treatment induces apoptosis in M24met cells. (a) 3,3′,4,4′,5,5′-Hexahydroxystilbene (M8)-induced apoptosis as shown in the representative example of Annexin V flow cytometry analysis with the x axis showing Annexin V staining and the y axis 7-amino-actinomycin D (7-AAD) and phycoerythrin (PE) staining. (b) Summary of Annexin V assays analyzing M24met melanoma cells treated with 25 and 50μM M8 and 50μM resveratrol. The sum of the percentages of Annexin V and 7-AAD-PE-positive cells was calculated. Three independent experiments were pooled and analyzed as a combined data set. Columns, mean of three independent experiments; bars, SEM; asterisk, significance as determined by unpaired t-test. *P<0.05. (c) Cell lysates of M24met melanoma cells were subjected to immunoblotting for caspase-3 (band represents cleaved caspase-3 at 17kDa) and Bak after 48hours of M8 treatment. Indicated concentrations are in μM. Journal of Investigative Dermatology 2010 130, 1668-1679DOI: (10.1038/jid.2009.376) Copyright © 2010 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 M8 treatment leads to DNA damage, induces p53 phosphorylation, and the mismatch repair machinery. (a) Representative immunoblots of three independent experiments of MSH6, MSH2, MLH1, p53ser37, p53ser15, and p53 after 48hours treatment of 3,3′,4,4′,5,5′-hexahydroxystilbene (M8) with indicated concentrations (all concentrations are in μM). (b) Comet assay with indicated concentrations of M8 and resveratrol (Res). H2O2 served as positive control. Data of one representative experiment of three independently performed experiments are presented as arbitrary units in scatter plots. (c) Matrigel assay after 48hours of M8 treatment (25μM) on M24met. (d) Schematic of the proposed mechanisms of action of M8. Journal of Investigative Dermatology 2010 130, 1668-1679DOI: (10.1038/jid.2009.376) Copyright © 2010 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Antiproliferative effects of 3,3′,4,4′,5,5′-hexahydroxystilbene (M8) on M24met melanoma growth in vivo. M24met melanoma cells were implanted subcutaneously into the flank of severe combined immunodeficient (SCID) mice. Treatment (daily, intraperitoneal) started after clinical appearance of tumors. Tumors were excised at day 10, and the experiment was terminated at day 20. (a) Development of tumor size during therapy with indicated concentrations. Points, mean; bars, SD. (b) Tumor volume at the day of excision. Bars, SD. (c) Immunohistochemistry of M24met tumors with anti-human Ki-67 antibody (brown, indicated with arrows). (d) Computer-assisted quantification of Ki-67-positive cells per 10 high-power fields. Columns, mean; bars, SEM; asterisk, significance as determined by unpaired t-test. **P<0.01; NS, not significant. Journal of Investigative Dermatology 2010 130, 1668-1679DOI: (10.1038/jid.2009.376) Copyright © 2010 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 6 M8 reduces metastasis in distant lymph nodes. Lymph nodes derived from the M24met tumor-bearing mice were examined for their weight and stained with hematoxylin and eosin and for human vimentin. (a) Weight of the axillary and inguinal lymph nodes in control and treated animals; (b) volume of the axillary and inguinal lymph nodes, mean; bars, SEM; (c) mean of the grade defining the vimentin-positive staining in each group; (d) summary of percent of macrometastasis and micrometastasis in lymph nodes of 3,3′,4,4′,5,5′-hexahydroxystilbene (M8)-treated and control animals. Significance as determined by Kruskal–Wallis test. *P<0.05. Journal of Investigative Dermatology 2010 130, 1668-1679DOI: (10.1038/jid.2009.376) Copyright © 2010 The Society for Investigative Dermatology, Inc Terms and Conditions