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Sökning: WFRF:(Karakaya Sinan)

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1.
  • Fredlund, Elina, et al. (författare)
  • MOXD1 is a lineage-specific gene and a tumor suppressor in neuroblastoma
  • 2024
  • Ingår i: Science Advances. - 2375-2548. ; 10:25
  • Tidskriftsartikel (refereegranskat)abstract
    • Neuroblastoma is a childhood developmental cancer; however, its embryonic origins remain poorly understood. Moreover, in-depth studies of early tumor-driving events are limited because of the lack of appropriate models. Herein, we analyzed RNA sequencing data obtained from human neuroblastoma samples and found that loss of expression of trunk neural crest–enriched gene MOXD1 associates with advanced disease and worse outcome. Further, by using single-cell RNA sequencing data of human neuroblastoma cells and fetal adrenal glands and creating in vivo models of zebrafish, chick, and mouse, we show that MOXD1 is a determinate of tumor development. In addition, we found that MOXD1 expression is highly conserved and restricted to mesenchymal neuroblastoma cells and Schwann cell precursors during healthy development. Our findings identify MOXD1 as a lineage-restricted tumor-suppressor gene in neuroblastoma, potentiating further stratification of these tumors and development of novel therapeutic interventions.
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2.
  • Karakaya, Sinan, et al. (författare)
  • Cytoplasmic HIF-2α as tissue biomarker to identify metastatic sympathetic paraganglioma
  • 2023
  • Ingår i: Scientific Reports. - 2045-2322. ; 13:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Pheochromocytomas (PCCs) and paragangliomas (PGLs) are rare neuroendocrine tumors. PGLs can further be divided into sympathetic (sPGLs) and head-and-neck (HN-PGLs). There are virtually no treatment options, and no cure, for metastatic PCCs and PGLs (PPGLs). Here, we composed a tissue microarray (TMA) consisting of 149 PPGLs, reflecting clinical features, presenting as a useful resource. Mutations in the pseudohypoxic marker HIF-2 & alpha; correlate to an aggressive tumor phenotype. We show that HIF-2 & alpha; localized to the cytoplasm in PPGLs. This subcompartmentalized protein expression differed between tumor subtypes, and strongly correlated to proliferation. Half of all sPGLs were metastatic at time of diagnosis. Cytoplasmic HIF-2 & alpha; was strongly expressed in metastatic sPGLs and predicted poor outcome in this subgroup. We propose that higher cytoplasmic HIF-2 & alpha; expression could serve as a useful clinical marker to differentiate paragangliomas from pheochromocytomas, and may help predict outcome in sPGL patients.
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