Abstract
Loss of E-cadherin expression in melanoma correlates with increased tumor thickness and reduced disease-free survival. The molecular mechanisms underpinning its differential expression in melanoma tissue remain elusive. MicroRNAs (miRNAs) have been implicated in tumor progression and regulation of E-cadherin expression. Here, we demonstrate a significant correlation between tumor thickness and loss of expression of miR-200a, miR-200c, and miR-203 in a series of 23 frozen primary melanomas, where it was confirmed in two subsequent validation series (series 1: six nevi, 15 primary melanomas, and 16 metastases; series 2: 11 matched pairs of primary melanomas and metastases). Decreased levels of miR-200a, miR-200c, and miR-203 correlated with increasing thickness in the combined validation series (P = 0.024, 0.033, and 0.031, respectively). In addition, progressive loss of miR-200a expression with disease progression was observed in series 1 (P < 0.001) and in series 2 (P = 0.029). MiR-200 in situ hybridization and E-cadherin immunohistochemistry demonstrated reduced expression of both at the deep invasive margin of the tumor. Furthermore, a functional validation study using an anti-miR200 strategy demonstrated that loss of miR-200 expression in melanoma cell lines reduced E-cadherin expression. Collectively, our data point towards an important role for miR-200 and miR203 expression in regulating E-cadherin during melanoma progression.
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Figure S1
In situ detection of miR-200 and E-cadherin in a desmoplastic melanoma. Consecutive tissue sections of a desmoplastic melanoma (A, H&E staining) were subjected to Ecadherin immunohistochemistry (B,C) and miR-200c in situ hybridization (D,E). E-cadherin and miR-200c expression was not observed in the tumor (B and D, respectively), but the overlying epidermis was strongly positive for membranous E-cadherin (C, brown staining) and cytoplasmic miR-200c (E, blue staining; arrows indicate a few of many positive cells) expression (PDF 246 kb)
Table S1
List of 23 patients with primary melanomas and their pertinent clinical and histological features, used in the discovery phase of the study (PDF 44 kb)
Table S2A
List of 15 patients with primary melanomas and their pertinent clinical and histological features, used in the first validation phase of the study (PDF 40 kb)
Table S2B
List of 16 patients with melanomas metastases and 6 nevi used in the first validation phase of the study (PDF 33 kb)
Table S3
Pertinent clinical data and Ct values of the set of 11 paired primary-metastatic melanomas used in the second validation study (PDF 34 kb)
Table S4
Spread sheets of all miRNAs analysed, raw Ct values and calculated values (PDF 966 kb)
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van Kempen, L.C., van den Hurk, K., Lazar, V. et al. Loss of microRNA-200a and c, and microRNA-203 expression at the invasive front of primary cutaneous melanoma is associated with increased thickness and disease progression. Virchows Arch 461, 441–448 (2012). https://doi.org/10.1007/s00428-012-1309-9
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DOI: https://doi.org/10.1007/s00428-012-1309-9