Establishment of Murine Basal Cell Carcinoma Allografts: A Potential Model for Preclinical Drug Testing and for Molecular Analysis  Grace Ying Wang, Po-Lin.

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Establishment of Murine Basal Cell Carcinoma Allografts: A Potential Model for Preclinical Drug Testing and for Molecular Analysis  Grace Ying Wang, Po-Lin So, Lynn Wang, Eileen Libove, Joy Wang, Ervin H. Epstein  Journal of Investigative Dermatology  Volume 131, Issue 11, Pages 2298-2305 (November 2011) DOI: 10.1038/jid.2011.204 Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 The growth rate of the allografts was dose-dependent. (a) The tumor volumes were significantly different between the two doses for week 5 (3.7±2.5 vs. 30.59±8.4, P<0.05), week 7, and week 9 (P<0.05, noted with *). According to the mouse protocol, all the mice that were injected with 2 × 106 cells were killed at week 9 because of oversized tumors. (b) The specific growth rate (calculated by ln(V2)-ln(V1)) of the allografts injected with 2 × 106 cells was significantly higher than that of allografts injected with 106 cells. Data shown are average±SEM, n=6 for each group. Journal of Investigative Dermatology 2011 131, 2298-2305DOI: (10.1038/jid.2011.204) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Tumor growth rate increased through serial in vivo passaging. (a) The tumor volumes were plotted against the weeks past since the appearance of the first palpable tumor (defined as week 0). Data shown are average±SEM, n=5 for each group. (b)P-values of t-test between groups are shown. (c) Representative images show that there were more Ki67-positive cells in allografts than in the primary tumors. Bar=20 μm. Journal of Investigative Dermatology 2011 131, 2298-2305DOI: (10.1038/jid.2011.204) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 The allografts inherited the histopathological features of their original tumors. The allografts and their parental tumors were stained with hematoxylin and eosin (H&E) or anti-smooth muscle actin (SMA) antibody and assessed for type I (characterized by branching and radiating tumor cells, SMA-positive) or type II (characterized by basaloid cells arrayed in nests, SMA-negative) classification. Four primary tumors (two for each type) and the allografts derived from them (n=4 for each primary tumor) were analyzed. Bars=50 μm. Journal of Investigative Dermatology 2011 131, 2298-2305DOI: (10.1038/jid.2011.204) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 The allografts reproduced the immunophenotypic features of their original tumors. The allografts and their parental tumors were stained with anti-K14, anti-collagen IV, and anti-CD31 antibodies to assess the basal keratinocyte cell of origin, stroma density, and vasculature properties. Bars=50 μm. K14, keratin 14. Journal of Investigative Dermatology 2011 131, 2298-2305DOI: (10.1038/jid.2011.204) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 The stromal cells from the original mouse were detected in direct allografts. Primary basal cell carcinomas (BCCs) generated from male mouse were injected into female NOD/SCID mice. Fluorescence in situ hybridization was performed to detect cells from male donor mice with Cy3-conjugated Y-chromosome-specific painting probe (red). BCC tumor cells were stained with keratin 14 (K14) antibody (green). Y-chromosome-positive and K14-negative stromal cells were identified (arrows). Bars=20 μm. Journal of Investigative Dermatology 2011 131, 2298-2305DOI: (10.1038/jid.2011.204) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 6 Hedgehog signaling activity. (a) Gene expression level of Gli1 was determined by quantitative PCR for primary basal cell carcinomas (BCCs) (n=14), direct allografts (n=9), BSZ cells (n=3), and BSZ allografts (n=9). Y axis: fold changes (normalized by β-actin endogenous control) for each assay. Identical thresholds of 0.2 were set for all runs with four technical replicates. Data shown are average±SEM. (b)P-values of statistical analysis between groups by t-test. Journal of Investigative Dermatology 2011 131, 2298-2305DOI: (10.1038/jid.2011.204) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 7 Basal cell carcinoma allografts responded to tazarotene treatment. The allografts were randomly divided into three groups: the prevention group (n=10) received tazarotene when tumor cells were injected (defined as week 0); treatment group (n=10) received tazarotene once palpable tumors were observed (i.e., week 3); and the control group (n=8) received no treatment. Tumor volumes (measured once a week) are plotted against weeks past. Inset: prevention and treatment groups are plotted with a small scale of Y axis for tazarotene exposure period of week 3–week 11. It appeared that the treatment group grew significantly faster than the prevention group (t-test, paired, P<0.05). Data shown are average±SEM. Journal of Investigative Dermatology 2011 131, 2298-2305DOI: (10.1038/jid.2011.204) Copyright © 2011 The Society for Investigative Dermatology, Inc Terms and Conditions