Institute Oncologia Angel Roffo

Buenos Aires, Argentina

Institute Oncologia Angel Roffo

Buenos Aires, Argentina

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PubMed | CONICET, Hospital Italiano, Maimónides University, Institute Oncologia Angel Roffo and University of Rouen
Type: Journal Article | Journal: Molecular carcinogenesis | Year: 2015

The Receptor tyrosine kinase-like Orphan Receptor 1 (ROR1) is primarily expressed by neural crest cells during embryogenesis. Following a complete downregulation after birth, ROR1 was shown to re-express in various types of cancers. Little is known about ROR1 expression and function in melanoma. Here we show that ROR1 is aberrantly expressed in both melanoma cell lines and tumors and that its expression associates with poor Post-Recurrence Survival of melanoma. Using gain- and loss-of-function approaches we found that ROR1 enhances both anchorage-dependent and -independent growth of melanoma cells. In addition, ROR1 decreases cell adhesion and increases cell motility and migration. Mechanistically, ROR1 was found to induce upregulation of Akt and the mesenquimal markers N-cadherin and vimentin. The regulation of N-cadherin by ROR1 relies on both Akt dependent and independent mechanisms. ROR1 does not affect Wnt canonical pathway but was found to be engaged in a positive feedback loop with Wnt5a. In summary, we show that ROR1 contributes to melanoma progression and is a candidate biomarker of poor prognosis. Although further studies are needed to confirm this possibility, the present work indicates that ROR1 is a good prospective target for melanoma cancer therapy. 2015 Wiley Periodicals, Inc.


PubMed | National Institute Of Infectious Diseases Anlis Dr Carlos G Malbran, VU University Amsterdam, Hospital General Of Agudos Dr Cosme Argerich, Hospital Of Infecciosas Dr F Muniz and Institute Oncologia Angel Roffo
Type: Journal Article | Journal: Journal of medical virology | Year: 2016

Cutaneous human papillomaviruses (HPVs) comprise a large and highly heterogeneous virus group. Some of the cutaneous HPVs of the genus Beta have been suggested as a co-factor in the development of non-melanoma skin cancer (NMSC). The aim of this study was to determine cutaneous HPV prevalence and type-specific distribution in different kinds of skin lesions from Argentine patients visiting Dermatology Departments of three hospitals from Buenos Aires. A cross-sectional analysis was performed. HPV DNA was analyzed in (i) 3 patients with Epidermodysplasia verruciformis (EV) harboring benign lesions (BL) (n=1) and squamous cell carcinoma (SCC) (n=4); (ii) 240 non-EV patients harboring: (a) BL (n=38), (b) Actinic Keratosis (AK) (n=83), (c) SCC (n=74), and (d) basal cell carcinoma (BCC) (n=96). Detection and genotyping of 35 cutaneous HPV DNA was carried out by BGC-PCR and GP5+/6+PCR followed by reverse line blot assay. In EV patients, Beta types were found in all lesions (5/5), including the potentially high-risk HPV types 5 and 8, mostly in multiple infections. In non-EV patients, cutaneous types were found in 50.0% of BL, 43.4% of AK, 31.1% of SCC, and 16.7% of BCC. Beta HPVs were the most frequently found in all lesions, being present in all AK and SCC cases that were positive for HPV. No type-specific correlation with lesion severity was found. In our series, a wide spectrum of cutaneous HPV types was detected in different skin lesions. A possible role for these HPVs in skin carcinogenesis deserves further study. J. Med. Virol. 89:352-357, 2017. 2016 Wiley Periodicals, Inc.

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