Abstract

The oncogenic Kaposi's sarcoma–associated herpesvirus (KSHV) is a principal causative agent of primary effusion lymphoma (PEL), which is mostly seen in immunosuppressed patients. PEL is a rapidly progressing malignancy with a median survival time of approximately 6 months even under the conventional chemotherapy. We recently report that the hepatocyte growth factor (HGF)/c-MET pathway is highly activated in PEL cells and represents a promising therapeutic target (Blood. 2015;126(26):2821-31). However, the underlying mechanisms of c-MET activation within PEL cells remain largely unknown. To solve this puzzle, here we have utilized the next generation sequencing (NGS) based bioinformatics approach to investigate the genomic landscape of the c-MET gene and we found that there's no single nucleotide variations (SNVs) occurred in the c-MET genomic regions in a cohort of PEL samples. Consistently, Sanger sequencing analysis of frequently mutated exons such as exon 10, 14 and 19 shows no mutation of these c-MET exons in PEL cell-lines, which further supports the notion that mutations are not the major mechanism responsible for c-MET activation in PEL. Further, we found that a transmembrane receptor protein, Plexin-B1, is expressed in PEL cell-lines, which is required for c-MET-mediated PEL cell survival via direct protein interaction.

Highlights

  • The DNA tumor virus, Kaposi’s sarcoma-associated herpesvirus (KSHV) can cause several human cancers especially in the immunocompromised populations [1]

  • We recently report that the hepatocyte growth factor (HGF)/c-MET pathway is highly activated in primary effusion lymphoma (PEL) cells and represents a promising therapeutic target (Blood. 2015;126(26):2821-31)

  • Here we have utilized the generation sequencing (NGS) based bioinformatics approach to investigate the genomic landscape of the c-MET gene and we found that there’s no single nucleotide variations (SNVs) occurred in the c-MET genomic regions in a cohort of PEL samples

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Summary

Introduction

The DNA tumor virus, Kaposi’s sarcoma-associated herpesvirus (KSHV) can cause several human cancers especially in the immunocompromised populations [1]. Sanger sequencing analysis of frequently mutated exons such as exon 10, 14 and 19 shows no mutation of these c-MET exons in PEL cell-lines, which further supports the notion that mutations are not the major mechanism responsible for c-MET activation in PEL. We found that a transmembrane receptor protein, Plexin-B1, is expressed in PEL cell-lines, which is required for c-MET-mediated PEL cell survival via direct protein interaction.

Results
Conclusion

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