Zinc blocks gene expression of mitochondrial aconitase in human prostatic carcinoma cells

Ke Hung Tsui, Phei Lang Chang, Horng Heng Juang

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Mitochondrial aconitase (mACON) contains a [4Fe-4S] cluster as the key enzyme for citrate oxidation in the human prostatic epithelial cell. Although there is accumulating evidence indicating that accumulation of high levels of zinc in prostate epithelial cells causes reduced efficiency of citrate oxidation, zinc regulation on the mACON is still not well understood. From in vitro studies, zinc chloride treatment has been developed using humic acid as the carrier (Zn-HA) in human prostatic carcinoma cells, PC-3. Zn-HA treatment (0.1-10 μM) restricts mACON enzymatic activity, which attenuates citrate utility and decreases intracellular ATP levels in PC-3 cells, whereas the effect is blocked by adding the zinc chelator, diethylenetriaminepentaacetic acid (DTPA). Immunoblot, ribonuclease-protection and transient gene-expression assays indicate that Zn-HA treatments inhibit mACON gene expression. Mutation of the putative metal response element (MRE) from CTCGCCTTCA to TGATCCTTCA abolishes Zn-HA inhibition of mACON promoter activity. Our results have demonstrated that zinc possesses a specific regulatory mechanism on the mACON gene, and a biologic function of the putative metal regulatory system in mACON gene transcription has been identified.

Original languageEnglish
Pages (from-to)609-615
Number of pages7
JournalInternational Journal of Cancer
Issue number3
Publication statusPublished - Mar 2006
Externally publishedYes


  • Aconitase
  • Humic acid
  • Metal response element
  • Prostate
  • Zinc

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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