Tumour angiogenesis in Epstein-Barr virus-associated post-transplant smooth muscle tumours

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• 作者：Danny Jonigk (1)
  Nicole Izykowski (1)
  Lavinia Maegel (1)
  Eileen Schormann (1)
  Britta Ludewig (1)
  Hans Kreipe (1)
  Kais Hussein (1)
  
• 关键词：PTSMT ; Post ; transplant smooth muscle tumours ; EBV ; Angiogenesis ; Tumour
• 刊名：Clinical Sarcoma Research
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：4
• 期：1
• 全文大小：364 KB
• 作者单位：Danny Jonigk (1)
  Nicole Izykowski (1)
  Lavinia Maegel (1)
  Eileen Schormann (1)
  Britta Ludewig (1)
  Hans Kreipe (1)
  Kais Hussein (1)
  
  1. Institute of Pathology, Hannover Medical School (MHH), Carl-Neuberg-Str. 1, D-30625, Hanover, Germany
  
• ISSN：2045-3329

文摘

Epstein-Barr virus (EBV)-associated post-transplant smooth muscle tumours (PTSMT), are rare complications following organ/stem cell transplantation. Despite the mainly benign behaviour of PTSMT, alternative therapies are needed for those patients with progressive tumours. In tumours not approachable by surgery or reduction of immunosuppression, the angiogenic microenvironment might be a potential target of therapy, an approach that is well utilised in other soft tissue neoplasms. In a previous study, we evaluated the expression of EBV-related genes and the microRNA profile in PTSMT, but so far the characteristics of angiogenesis in PTSMT are not known. Therefore, the aim of this study was to evaluate the expression pattern of angiogenesis-related genes in PTSMT, in order to identify potential target molecules for anti-angiogenic therapy. PTSMT (n-- tumours) were compared with uterine leiomyomas (n--). Analyses included real-time PCR of 45 angiogenesis-associated genes, immunohistochemistry (CD31, prostaglandin endoperoxide synthase 1/PTGS1) and assessment of tumour vascularisation by conventional histopathology. PTSMT showed similar or fewer vessels than leiomyomas. Of the genes under investigation, 23 were down-deregulated (pro-angiogenic and some anti-angiogenic factors) and five were up-regulated (e.g. PTGS1 which is expressed at very low levels in leiomyomas but moderately higher levels in PTSMT). In summary, no particular target molecule could be identified, because tumour angiogenesis in PTSMT is characterised by low levels of major pro-angiogenic factors and there is no prominent increase in tumour vascularisation. EBV can induce angiogenesis via its viral late membrane protein 1 (LMP1) but PTSMT frequently do not express LMP1, which could be an explanation why, despite EBV infection, PTSMT show no exaggerated tumour angiogenesis.