Imidazoline drugs stabilize lysosomes and inhibit oxidative cytotoxicity in astrocytes

Sang-Hyun Choi, Dong Hee Choi, Jeong Jin Lee, Moon Sung Park, Boe Gwun Chun

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Oxidative stress is a primary pathogenesis in the brain, which is particularly vulnerable to oxidative stress. Maintenance of astrocyte functions under oxidative stress is essential to prevent neuronal injuries and to recover neuronal functions in various pathologic conditions. Imidazoline drugs have affinities for imidazoline receptors, which are highly distributed in the brain, and have been shown to be neuroprotective. This study presented the protective effects of several imidazoline drugs against oxidative cytotoxicity, in primary cultures of astrocytes. Imidazoline drugs, such as idazoxan, guanabenz, guanfacine, BU224, and RS-45041-190, showed protective effects against naphthazarin-induced oxidative cytotoxicity, as evidenced by LDH release and Hoechst 33342/propidium iodide staining. The imidazoline drugs stabilized lysosomes and inhibited naphthazarin-induced lysosomal destabilization, as evidenced by acridine orange relocation. Guanabenz inhibited, the leakage of lysosomal cathepsin D to cytosol, the decreased mitochondrial potential, and the release of mitochondrial cytochrome c, which were induced by naphthazarin. The lysosomal destabilization by oxidative stress and other apoptotic signals and subsequent cathepsin D leakage to the cytosol can induce apoptotic changes of mitochondria and eventually cell death. Therefore, lysosomal stabilization by imidazoline drugs may be ascribed to their protective effects against oxidative cytotoxicity.

Original languageEnglish
Pages (from-to)394-405
Number of pages12
JournalFree Radical Biology and Medicine
Volume32
Issue number5
DOIs
Publication statusPublished - 2002 Mar 1

Fingerprint

Imidazolines
Cytotoxicity
Lysosomes
Oxidative stress
Astrocytes
Oxidative Stress
Guanabenz
Cathepsin D
Pharmaceutical Preparations
Cytosol
Brain
Guanfacine
Imidazoline Receptors
Idazoxan
Acridine Orange
Mitochondria
Relocation
Propidium
Cell death
Cytochromes c

Keywords

  • Astrocytes
  • BU224
  • Cathepsin D
  • Cytochrome c
  • Free radicals
  • Guanabenz
  • Guanfacine
  • Idazoxan
  • Lysosomal stability
  • Mitochondrial potential
  • Naphthazarin
  • RS-45041-190

ASJC Scopus subject areas

  • Biochemistry
  • Physiology (medical)

Cite this

Imidazoline drugs stabilize lysosomes and inhibit oxidative cytotoxicity in astrocytes. / Choi, Sang-Hyun; Choi, Dong Hee; Lee, Jeong Jin; Park, Moon Sung; Chun, Boe Gwun.

In: Free Radical Biology and Medicine, Vol. 32, No. 5, 01.03.2002, p. 394-405.

Research output: Contribution to journalArticle

Choi, Sang-Hyun ; Choi, Dong Hee ; Lee, Jeong Jin ; Park, Moon Sung ; Chun, Boe Gwun. / Imidazoline drugs stabilize lysosomes and inhibit oxidative cytotoxicity in astrocytes. In: Free Radical Biology and Medicine. 2002 ; Vol. 32, No. 5. pp. 394-405.
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