Fluorinated triphenylphosphonium analogs improve cell selectivity and in vivo detection of mito-metformin.

Abstract

Triphenylphosphonium (TPP+) conjugated compounds selectively target cancer cells by exploiting their hyperpolarized mitochondrial membrane potential. To date, studies have focused on modifying either the linker or the cargo of TPP+-conjugated compounds. Here, we investigated the biological effects of direct modification to TPP+ to improve the efficacy and detection of mito-metformin (MMe), a TPP+-conjugated probe we have shown to have promising preclinical efficacy against solid cancer cells. We designed, synthesized, and tested trifluoromethyl and methoxy MMe analogs (pCF3-MMe, mCF3-MMe, and pMeO-MMe) against multiple distinct human cancer cells. pCF3-MMe showed enhanced selectivity toward cancer cells compared to MMe, while retaining the same signaling mechanism. Importantly, pCF3-MMe allowed quantitative monitoring of cellular accumulation via 19F-NMR in vitro and in vivo. Furthermore, adding trifluoromethyl groups to TPP+ reduced toxicity in vivo while retaining anti-tumor efficacy, opening an avenue to de-risk these next-generation TPP+-conjugated compounds.

• Authors: Mahmoud AbuEid, Robert F Keyes, Donna McAllister, Francis Peterson, Ishaque Pulikkal Kadamberi, Daniel J Sprague, Pradeep Chaluvally-Raghavan, Brian C Smith, Michael B Dwinell
• Journal: iScience (iScience) Vol. 25 Issue 12 Pg. 105670 (Dec 22 2022) ISSN: 2589-0042 [Electronic] United States
• PMID: 36567718 (Publication Type: Journal Article)
• Copyright: © 2022 The Authors.