Structural determination of lysosphingomyelin-509 and discovery of novel class lipids from patients with niemann–pick disease type C

Masamitsu Maekawa, Isamu Jinnoh, Yotaro Matsumoto, Aya Narita, Ryuichi Mashima, Hidenori Takahashi, Anna Iwahori, Daisuke Saigusa, Kumiko Fujii, Ai Abe, Katsumi Higaki, Shosei Yamauchi, Yuji Ozeki, Kazutaka Shimoda, Yoshihisa Tomioka, Torayuki Okuyama, Yoshikatsu Eto, Kousaku Ohno, Peter T. Clayton, Hiroaki YamaguchiNariyasu Mano

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Niemann–Pick disease type C (NPC) is an autosomal recessive disorder caused by the mutation of cholesterol-transporting proteins. In addition, early treatment is important for good prognosis of this disease because of the progressive neurodegeneration. However, the diagnosis of this disease is difficult due to a variety of clinical spectrum. Lysosphingomyelin-509, which is one of the most useful biomarkers for NPC, was applied for the rapid and easy detection of NPC. The fact that its chemical structure was unknown until recently implicates the unrevealed pathophysiology and molecular mechanisms of NPC. In this study, we aimed to elucidate the structure of lysosphingomyelin-509 by various mass spectrometric techniques. As our identification strategy, we adopted analytical and organic chemistry approaches to the serum of patients with NPC. Chemical derivatization and hydrogen abstraction dissociation–tandem mass spectrometry were used for the determination of function groups and partial structure, respectively. As a result, we revealed the exact structure of lysosphingomyelin-509 as N-acylated and O-phosphocholine adducted serine. Additionally, we found that a group of metabolites with N-acyl groups were increased considerably in the serum/plasma of patients with NPC as compared to that of other groups using targeted lipidomics analysis. Our techniques were useful for the identification of lysosphingomyelin-509.

Original languageEnglish
Article number5018
JournalInternational journal of molecular sciences
Volume20
Issue number20
DOIs
Publication statusPublished - 2019 Oct 2

Keywords

  • Biomarkers
  • Chemical derivatization
  • Chemical diagnosis
  • HAD-MS/MS
  • Identification
  • LC-MS/MS
  • Lysosphingomyelin-509
  • N-acyl-phospholipids
  • Niemann
  • Pick disease type C
  • Structural determination

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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