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• W2016141579 abstract "Glucocorticoid receptors (GRs) are ubiquitous, nuclear hormone receptors residing in cell types of both cancer and noncancerous origin. It is not known whether cancer cell–associated GR alone can be selectively manipulated for delivery of exogenous genes to its nucleus for eliciting anticancer effect. We find that GR ligand, dexamethasone (Dex) in association with cationic lipoplex (termed as targeted lipoplex) could selectively manipulate GR in cancer cells alone for the delivery of transgenes in the nucleus, a phenomenon that remained unobserved in normal cells. The targeted lipoplex (i) showed GR-targeted transfections in all cancer cells experimented (P < 0.01), (ii) significantly diminished transfection in cancer cells when GR is downregulated (P < 0.01), and (iii) elicited specific nuclear translocation of targeted lipoplex in cancer cells, followed by upregulated transactivation of glucocorticoid response element (GRE)– promoted gene. Using anticancer gene, targeted lipoplex induced significant tumor growth retardation in mice in comparison to different control groups (P < 0.05). Interestingly, cell surface–associated Hsp90 in cancer cells assisted the intracellular uptake of GR-targeted lipoplex. Moreover, selective inhibition of Hsp90 in noncancer cells resulted in cancer cell-like, aberrant, GR activation. The current study discovers a therapeutically important, unique property of cancer cell associated–GR that may be linked to a compromised role of Hsp90. Glucocorticoid receptors (GRs) are ubiquitous, nuclear hormone receptors residing in cell types of both cancer and noncancerous origin. It is not known whether cancer cell–associated GR alone can be selectively manipulated for delivery of exogenous genes to its nucleus for eliciting anticancer effect. We find that GR ligand, dexamethasone (Dex) in association with cationic lipoplex (termed as targeted lipoplex) could selectively manipulate GR in cancer cells alone for the delivery of transgenes in the nucleus, a phenomenon that remained unobserved in normal cells. The targeted lipoplex (i) showed GR-targeted transfections in all cancer cells experimented (P < 0.01), (ii) significantly diminished transfection in cancer cells when GR is downregulated (P < 0.01), and (iii) elicited specific nuclear translocation of targeted lipoplex in cancer cells, followed by upregulated transactivation of glucocorticoid response element (GRE)– promoted gene. Using anticancer gene, targeted lipoplex induced significant tumor growth retardation in mice in comparison to different control groups (P < 0.05). Interestingly, cell surface–associated Hsp90 in cancer cells assisted the intracellular uptake of GR-targeted lipoplex. Moreover, selective inhibition of Hsp90 in noncancer cells resulted in cancer cell-like, aberrant, GR activation. The current study discovers a therapeutically important, unique property of cancer cell associated–GR that may be linked to a compromised role of Hsp90." @default.
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• W2016141579 date "2009-04-01" @default.
• W2016141579 modified "2023-10-12" @default.
• W2016141579 title "Selective Cancer Targeting via Aberrant Behavior of Cancer Cell-associated Glucocorticoid Receptor" @default.
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• W2016141579 doi "https://doi.org/10.1038/mt.2009.4" @default.
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