High expression of cytoplasmic phosphorylated CSE1L in malignant melanoma but not in benign nevi: Phosphorylated CSE1L for the discrimination between melanoma and benign nevi

Szu Ying Chin, Pei Ru Wu, Yi Hsien Shih, Chung Min Yeh, Woan Ruoh Lee, Shing Chuan Shen, Kun Tu Yeh, Ming Chung Jiang, Jonathan Te Peng Tseng

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6 Citations (Scopus)


Melanoma is difficult to treat when it has metastasized. Discrimination between melanoma and benign nevi in melanocytic lesions is crucial for identifying melanomas and consequently improving melanoma treatment and prognosis. The chromosome segregation 1-like (CSE1L) protein has been implicated in cancer progression and is regulated by phosphorylation by extracellular signal-regulated kinase 1/2 (ERK1/2) signaling, a critical pathway in melanoma progression. We studied phosphorylated CSE1L expression in human melanoma and benign nevi specimens. Immunohistochemistry with tissue microarray using antibody against phosphorylated CSE1L showed that melanomas exhibited considerable staining for phosphorylated CSE1L (100%, 34/34), whereas the benign nevi showed only faint staining (0%, 0/34). Melanomas mainly exhibited cytoplasmic phospho-CSE1L distribution, whereas the benign nevi mainly exhibited nuclear phospho-CSE1L distribution. Moreover, immunohistochemistry with anti-CSE1L antibody revealed that CSE1L mainly exhibited cytoplasmic/nuclear distribution and nuclear distribution was the dominant. Immunofluorescence with B16F10 melanoma cells showed cytoplasmic distribution of phospho-CSE1L and nuclear distribution of CSE1L. Our results indicated that nuclear CSE1L is mainly non-phosphorylated CSE1L and is involved in gene regulation and cytoplasmic CSE1L is mainly phosphorylated CSE1L and is involved in cytoplasmic signaling regulation in melanocytic tumorigenesis. Furthermore, immunohistochemical analysis of cytoplasmic phospho-CSE1L may aid in the diagnosis of melanoma.

Original languageEnglish
Pages (from-to)1393-1401
Number of pages9
JournalInternational Journal of Clinical and Experimental Pathology
Issue number2
Publication statusPublished - 2015



  • CSE1L
  • Cytoplasmic
  • Melanoma
  • Nuclear
  • Phospho-CSE1L
  • Phosphorylation

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

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