Low expression of human tubulin tyrosine ligase and suppressed tubulin tyrosination/detyrosination cycle are associated with impaired neuronal differentiation in neuroblastomas with poor prognosis

International Journal of Cancer. Journal International Du Cancer
Chiaki KatoAkira Nakagawara

Abstract

Neuroblastoma (NBL), one of the most common childhood solid tumors, has a distinct nature in different prognostic subgroups. However, the precise mechanism underlying this phenomenon remains largely unknown. To understand the molecular and genetic bases of neuroblastoma, we have generated its cDNA libraries and identified a human ortholog of tubulin tyrosine ligase gene (hTTL/Nbla0660) as a differentially expressed gene at high levels in a favorable subset of the tumor. Tubulin is subjected to several types of evolutionarily conserved posttranslational modification, including tyrosination and detyrosination. Tubulin tyrosine ligase catalyzes ligation of the tyrosine residue to the COOH terminus of the detyrosinated form of alpha-tubulin. The measurement of hTTL mRNA expression in 74 primary neuroblastomas by quantitative real-time reverse transcription-PCR revealed that its high expression was significantly associated with favorable stages (1, 2 and 4s; p = 0.0069), high TrkA expression (p = 0.002), a single copy of MYCN (p < 0.00005), tumors found by mass screening (p = 0.0042), nonadrenal origin (p = 0.0042) and good prognosis (p = 0.023). The log-rank test showed that high expression of hTTL was an indicator of favorable pro...Continue Reading

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Jun 7, 2005·Cancer Letters·Miki OhiraAkira Nakagawara
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