Haloperidol-associated stealth liposomes: A potent carrier for delivering genes to human breast cancer cells

Amarnath Mukherjee, Tekkatte Krishnamurthy Prasad, Nalam Madhusudhana Rao, Rajkumar Banerjee

Research output: Contribution to journalArticle

47 Scopus citations

Abstract

Sigma receptors are membrane-bound proteins that are overexpressed in certain human malignancies including breast cancer. These receptors show very high affinity for various sigma ligands including neuroleptics like haloperidol. We hypothesized that in associating haloperidol-linked lipid into the cationic lipid-DNA complex, we can specifically target and deliver genes to breast cancer cells that overexpress sigma receptors. In the present study, haloperidol was chemically modified to conjugate at the distal end of the polyethylene glycol-linked phospholipid, which was then incorporated into the cationic liposome known to condense and deliver genes inside cells. The resulting haloperidol-conjugated targeted lipoplex showed at least 10-fold higher (p < 0.001) reporter gene expression in MCF-7 cells than control lipoplex. The reporter gene expression of the targeted lipoplex was significantly blocked by haloperidol (p < 0.001) and by another sigma ligand, 1,3-ditolylguanidine (p < 0.001) in the majority of cationic lipid to DNA charge ratios (±). Spironolactone-mediated sigma receptor down-regulation enabled MCF-7 to show 10-fold lower transgene expression with targeted lipoplex compared with that obtained in spironolactone-untreated cells. The targeted lipoplex generated nonspecific gene expression in sigma receptor-nonexpressing human cancer cells such as Hela, KB, HepG2, and Chinese hamster ovary cells. Moreover, the transgene expression remained unabated in physiologically relevant serum concentrations. This is the first study to demonstrate that haloperidol-targeted gene delivery systems can mediate efficient targeting of genes to sigma receptor-overexpressing breast cancer cells, thereby becoming a novel class of therapeutics for the treatment of human cancers.

Original languageEnglish (US)
Pages (from-to)15619-15627
Number of pages9
JournalJournal of Biological Chemistry
Volume280
Issue number16
DOIs
StatePublished - Apr 22 2005
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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