TY - JOUR T1 - Small Molecule-Gold Nanorod Conjugates Selectively Target and Induce Macrophage Cytotoxicity towards Breast Cancer Cells JF - Small Y1 - 2012 A1 - Dreaden, E. C. A1 - Mwakwari, S. C. A1 - Austin, Lauren A1 - Kieffer, M. J. A1 - Oyelere, A. K. A1 - El-Sayed, M. A. VL - 8 SN - 1613-6810 N1 - Times Cited: 0Dreaden, Erik C. Mwakwari, Sandra C. Austin, Lauren A. Kieffer, Matthew J. Oyelere, Adegboyega K. El-Sayed, Mostafa A. M3 - 10.1002/smll.201200333 ER - TY - JOUR T1 - Tamoxifen-Poly(ethylene glycol)-Thiol Gold Nanoparticle Conjugates: Enhanced Potency and Selective Delivery for Breast Cancer Treatment JF - Bioconjugate Chemistry Y1 - 2009 A1 - Dreaden, Erik A1 - Mwakwari, S. C. A1 - Sodji, Q. H. A1 - Oyelere, A. K. A1 - El-Sayed, Mostafa A AB - The breast cancer treatment drug tamoxifen has been widely administered for more than three decades. This small molecule competes with 17 beta-estradiol for binding to estrogen receptor, a hormone receptor upregulated in a majority of breast cancers, Subsequently initiating programmed cell death. We have synthesized a thiol-PEoylated tamoxifen derivative that can be used to selectively target and deliver plasmonic gold nanoparticles to estrogen receptor positive breast cancer cells with tip to 2.7-fold enhanced drug potency in vitro. Optical microscopy/spectroscopy, tirne-dependent dose-response data, and estrogen competition studies indicate that augmented activity is due to increased rates of intracellular tamoxifen transport by nanoparticle endocytosis, rather than by passive diffusion of the free drug. Both ligand- and receptor-dependent intracellular delivery of gold nanoparticles suggest that plasma membrane localized estrogen receptor alpha may facilitate selective uptake and retention of this and other therapeutic nanoparticle conjugates. Combined targeting selectivity and enhanced potency provides opportunities for both multimodal endocrine treatment strategies and adjunctive laser photothermal therapy. VL - 20 SN - 1043-1802 N1 - Dreaden, Erik C. Mwakwari, Sandra C. Sodji, Quaovi H. Oyelere, Adegboyega K. El-Sayed, Mostafa A. M3 - 10.1021/bc9002212 ER -