Antimelanoma activity of apoptogenic carbonyl scavengers

Georg T Wondrak, Myron K. Jacobson, Elaine L. Jacobson

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Therapeutic induction of apoptosis is an important goal of anticancer drug design. Cellular carbonyl stress mediated by endogenous reactive carbonyl species (RCS) such as glyoxal and methylglyoxal (MG) affects proliferative signaling and metastasis of human tumor cells. Recent research suggests that RCS produced constitutively during increased tumor cell glycolysis may be antiapoptotic survival factors and thus represent a novel molecular target for anticancer intervention. Here, we demonstrate the tumor cell-specific apoptogenicity of carbonyl scavengers, which act by covalently trapping RCS, against human (A375, G361, and LOX) and murine (B16) melanoma cell lines. A structure-activity relationship study identified nucleophilic carbonyl scavenger pharmacophores as the functional determinants of apoptogenic antimelanoma activity of structurally diverse agents such as 3,3-dimethyl-D-cysteine and aminoguanidine. Previous work has demonstrated that covalent adduction of protein-arginine residues in the mitochondrial permeability transition (MPT) pore and heat shock protein 27 by intracellular MG produced in tumor cell glycolysis inhibits mitochondrial apoptosis and enhances cancer cell survival. Indeed, in various melanoma cell lines, carbonyl scavenger-induced apoptosis was antagonized by pretreatment with the membrane-permeable RCS phenylglyoxal (PG). Carbonyl scavenger-induced apoptosis was associated with early loss of mitochondrial transmembrane potential, and cyclosporin A antagonized the effects of carbonyl scavengers, suggesting a causative role of MPT pore opening in carbonyl scavenger apoptogenicity. Consistent with RCS inhibition of mitochondrial apoptosis in melanoma cells, staurosporine-induced apoptosis also was suppressed by PG pretreatment. Our results suggest that carbonyl scavengers acting as direct molecular antagonists of RCS are promising apoptogenic prototype agents for antimelanoma drug design.

Original languageEnglish (US)
Pages (from-to)805-814
Number of pages10
JournalJournal of Pharmacology and Experimental Therapeutics
Volume316
Issue number2
DOIs
StatePublished - Feb 2006

Fingerprint

Apoptosis
Phenylglyoxal
Pyruvaldehyde
Drug Design
Glycolysis
Neoplasms
Melanoma
Glyoxal
HSP27 Heat-Shock Proteins
Cell Line
Experimental Melanomas
Staurosporine
Structure-Activity Relationship
Membrane Potentials
Cyclosporine
Cysteine
Arginine
Cell Survival
Neoplasm Metastasis
Membranes

ASJC Scopus subject areas

  • Pharmacology

Cite this

Antimelanoma activity of apoptogenic carbonyl scavengers. / Wondrak, Georg T; Jacobson, Myron K.; Jacobson, Elaine L.

In: Journal of Pharmacology and Experimental Therapeutics, Vol. 316, No. 2, 02.2006, p. 805-814.

Research output: Contribution to journalArticle

Wondrak, Georg T ; Jacobson, Myron K. ; Jacobson, Elaine L. / Antimelanoma activity of apoptogenic carbonyl scavengers. In: Journal of Pharmacology and Experimental Therapeutics. 2006 ; Vol. 316, No. 2. pp. 805-814.
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