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uveal melanoma exosome

Martina Angi, Helen Kalirai, Samuel Prendergast, Deborah Simpson, Dean E Hammond, Michele C Madigan, Robert J Beynon, Sarah E Coupland
Uveal melanoma (UM), the most common primary intraocular tumour in adults, is characterised by a high frequency of metastases to the liver, typically with a fatal outcome. Proteins secreted from cancer cells ('secretome') are biologically important molecules thought to contribute to tumour progression. We examined the UM secretome by applying a label-free nanoLCMS/MS proteomic approach to profile proteins secreted into culture media by primary UM tumours with a high- (HR; n = 11) or low- (LR; n = 4) metastatic risk, compared to normal choroidal melanocytes (NCM) from unaffected post-mortem eyes...
August 2, 2016: Oncotarget
Marco Ragusa, Cristina Barbagallo, Luisa Statello, Rosario Caltabiano, Andrea Russo, Lidia Puzzo, Teresio Avitabile, Antonio Longo, Mario D Toro, Davide Barbagallo, Hadi Valadi, Cinzia Di Pietro, Michele Purrello, Michele Reibaldi
Uveal melanoma (UM) represents approximately 5-6% of all melanoma diagnoses and up to 50% of patients succumb to their disease. Although several methods are available, accurate diagnosis is not always easily feasible because of potential accidents (e.g., intraocular hemorrhage). Based on the assumption that the profile of circulating miRNAs is often altered in human cancers, we verified whether UM patients showed different vitreous humor (VH) or serum miRNA profiles with respect to healthy controls. By using TaqMan Low Density Arrays, we analyzed 754 miRNAs from VH, vitreal exosomes, and serum of 6 UM patients and 6 healthy donors: our data demonstrated that the UM VH profile was unique and only partially overlapping with that from serum of the same patients...
2015: Cancer Biology & Therapy
Maria Eldh, Roger Olofsson Bagge, Cecilia Lässer, Joar Svanvik, Margareta Sjöstrand, Jan Mattsson, Per Lindnér, Dong-Sic Choi, Yong Song Gho, Jan Lötvall
BACKGROUND: Uveal melanoma is a tumour arising from melanocytes of the eye, and 30 per cent of these patients develop liver metastases. Exosomes are small RNA containing nano-vesicles released by most cells, including malignant melanoma cells. This clinical translational study included patients undergoing isolated hepatic perfusion (IHP) for metastatic uveal melanoma, from whom exosomes were isolated directly from liver perfusates. The objective was to determine whether exosomes are present in the liver circulation, and to ascertain whether these may originate from melanoma cells...
2014: BMC Cancer
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