Gold-nanofève surface-enhanced Raman spectroscopy visualizes hypotaurine as a robust anti-oxidant consumed in cancer survival

Megumi Shiota, Masayuki Naya, Takehiro Yamamoto, Takako Hishiki, Takeharu Tani, Hiroyuki Takahashi, Akiko Kubo, Daisuke Koike, Mai Itoh, Mitsuyo Ohmura, Yasuaki Kabe, Yuki Sugiura, Nobuyoshi Hiraoka, Takayuki Morikawa, Keiyo Takubo, Kentaro Suina, Hideaki Nagashima, Oltea Sampetrean, Osamu Nagano, Hideyuki SayaShogo Yamazoe, Hiroyuki Watanabe, Makoto Suematsu

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Gold deposition with diagonal angle towards boehmite-based nanostructure creates random arrays of horse-bean-shaped nanostructures named gold-nanofève (GNF). GNF generates many electromagnetic hotspots as surface-enhanced Raman spectroscopy (SERS) excitation sources, and enables large-area visualization of molecular vibration fingerprints of metabolites in human cancer xenografts in livers of immunodeficient mice with sufficient sensitivity and uniformity. Differential screening of GNF-SERS signals in tumours and those in parenchyma demarcated tumour boundaries in liver tissues. Furthermore, GNF-SERS combined with quantum chemical calculation identified cysteine-derived glutathione and hypotaurine (HT) as tumour-dominant and parenchyma-dominant metabolites, respectively. CD44 knockdown in cancer diminished glutathione, but not HT in tumours. Mechanisms whereby tumours sustained HT under CD44-knockdown conditions include upregulation of PHGDH, PSAT1 and PSPH that drove glycolysis-dependent activation of serine/glycine-cleavage systems to provide one-methyl group for HT synthesis. HT was rapidly converted into taurine in cancer cells, suggesting that HT is a robust anti-oxidant for their survival under glutathione-suppressed conditions.

Original languageEnglish
Article number1561
JournalNature Communications
Volume9
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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