N-Acetyl Galactosamine-Conjugated Antisense Drug to APOC3 Mrna, Triglycerides and Atherogenic Lipoprotein Levels

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N-Acetyl Galactosamine-Conjugated Antisense Drug to APOC3 Mrna, Triglycerides and Atherogenic Lipoprotein Levels European Heart Journal (2019) 40, 2785–2796 CLINICAL RESEARCH doi:10.1093/eurheartj/ehz209 Lipids N-acetyl galactosamine-conjugated antisense drug to APOC3 mRNA, triglycerides and atherogenic lipoprotein levels Veronica J. Alexander1, Shuting Xia1, Eunju Hurh2, Steven G. Hughes1, Louis O’Dea2, Richard S. Geary1, Joseph L. Witztum3, and Sotirios Tsimikas1,4* 1Ionis Pharmaceuticals, Inc., 2855 Gazelle Ct, Carlsbad, CA 92010, USA; 2Akcea Therapeutics, 22 Boston Wharf Road, 9th Floor, Boston, MA 02210, USA; 3Division of Endocrinology and Metabolism, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0682, USA; and 4Division of Cardiovascular Medicine, Sulpizio Cardiovascular Center, Vascular Medicine Program, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0682, USA Received 15 January 2019; revised 8 March 2019; editorial decision 25 March 2019; accepted 4 April 2019; online publish-ahead-of-print 24 April 2019 See page 2797 for the editorial comment on this article (doi: 10.1093/eurheartj/ehz321) Aims Elevated apolipoprotein C-III (apoC-III) levels are associated with hypertriglyceridaemia and coronary heart disease. AKCEA-APOCIII-LRx is an N-acetyl galactosamine-conjugated antisense oligonucleotide targeted to the liver that selectively inhibits apoC-III protein synthesis. ................................................................................................................................................................................................... Methods The safety, tolerability, and efficacy of AKCEA-APOCIII-LRx was assessed in a double-blind, placebo-controlled, and results dose-escalation Phase 1/2a study in healthy volunteers (ages 18–65) with triglyceride levels >_90 or >_200 mg/dL. Single-dose cohorts were treated with 10, 30, 60, 90, and 120 mg subcutaneously (sc) and multiple-dose cohorts were treated with 15 and 30 mg weekly sc for 6 weeks or 60 mg every 4 weeks sc for 3 months. In the single-dose cohorts treated with 10, 30, 60, 90, or 120 mg of AKCEA-APOCIII-LRx, median reductions of 0, -42%, -73%, -81%, and -92% in apoC-III, and -12%, -7%, -42%, -73%, and -77% in triglycerides were observed 14 days after dosing. In multiple-dose cohorts of 15 and 30 mg weekly and 60 mg every 4 weeks, median reductions of -66%, -84%, and -89% in apoC-III, and -59%, -73%, and -66% in triglycerides were observed 1 week after the last dose. Significant reductions in total cholesterol, apolipoprotein B, non-high-density lipoprotein cholesterol (HDL-C), very low- density lipoprotein cholesterol, and increases in HDL-C were also observed. AKCEA-APOCIII-LRx was well toler- ated with one injection site reaction of mild erythema, and no flu-like reactions, platelet count reductions, liver, or renal safety signals. ................................................................................................................................................................................................... Conclusion Treatment of hypertriglyceridaemic subjects with AKCEA-APOCIII-LRx results in a broad improvement in the atherogenic lipid profile with a favourable safety and tolerability profile. ClinicalTrials.gov Identifier: NCT02900027. ᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿᭿ Keywords Apolipoprotein C-III • Hypertriglyceridaemia • Antisense • Cardiovascular disease . common metabolic disturbances. Such elevations of triglycerides are Introduction . accompanied by elevations of remnant cholesterol that promote . atherogenesis and cardiovascular events.2,3 Asmallersubsetof Hypertriglyceridaemia is a prevalent disorder whose incidence is . increasing due to the global epidemics of obesity and diabetes melli- . patients with hypertriglyceridaemia have fasting chylomicronemia . 4 tus.1 The largest category of hypertriglyceridaemic patients have . and triglyceride levels >10 mmol/L and are categorized as having fa- . 5 modest elevations of triglycerides >2 mmol/L), due to a variety of . milial chylomicronemia syndrome (FCS). * Corresponding author. Tel:þ1 858-534-5109, Fax: þ1-858-534-2005, Email: [email protected] VC The Author(s) 2019. Published by Oxford University Press on behalf of the European Society of Cardiology. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact [email protected] 2786 V.J. Alexander et al. A key regulator of plasma triglyceride-rich lipoprotein (TRL) me- . 120 mg cohorts. For the multiple-dose study design all subjects . were required to have a fasting triglyceride level >_200 mg/dL. The tabolism is apolipoprotein C-III (apoC-III), a 79 amino acid glycopro- . tein synthesized principally in the liver and to a lesser extent in the . doses were 15 and 30 mg for the weekly dosing cohorts (N = 8 per 6 . cohort, total randomized six active: two placebo) and 60 mg for intestine. Apolipoprotein C-III circulates on very low-density lipo- . protein (VLDL), LDL, Lp(a), and HDL particles and can be present in . the every 4 weeks dosing cohort (N = 10, total randomized six ac- 7,8 . tive: four placebo). multiple copies per particle. Apolipoprotein C-III plays a key role in . determining serum triglyceride levels by two main mechanisms, by . inhibiting LPL activity as well as by directly inhibiting hepatic uptake of . Results TRL, thus leading to increased levels of chylomicrons and TRLs.9–11 . RNA-targeted therapies represent a novel platform for drug . Baseline characteristics of the study 12 . discovery involving chemically modified oligonucleotides. Volanes- . groups orsen, a second-generation antisense oligonucleotide (ASO) targets . A total of 40 subjects were enrolled in the single ascending dose hepatic APOC3 mRNA to inhibit apoC-III protein production, result- . (SAD) study, and 17 in the weekly and 10 subjects in the every ing in substantial reductions in plasma triglyceride levels.9,13,14 . 4 weeks multiple ascending dose (MAD) study. In the SAD cohorts, Furthermore, new targeting approaches of ASOs, using triantennary . subjects in all dose groups had elevated BMI (>25 kg/m2), and sub- N-acetyl galactosamine (GalNAc ) modified ASOs that target the . 3 . jects in the 90 mg and 120 mg dose group, due to inclusion criteria of asialoglycoprotein receptor (ASGPR) in hepatocytes, allows similar . triglycerides >200 mg/dL, had elevated triglyceride levels (Table 1). In efficacy untargeted ASO with 20–30-fold lower dosing, thus minimiz- . the MAD cohorts, all dose groups also had elevated BMI and elevated ing systemic exposure.15–18 In this Phase 1/2a study, we describe the . triglycerides. The mean apoC-III plasma levels in both SAD and MAD safety, tolerability, and efficacy of a GalNAc -modified ASO, AKCEA- . 3 . cohorts ranged from 9 to 15 mg/dL. The lipid panels otherwise APOCIII-L , which targets hepatic APOC3 mRNA,inotherwise . Rx . showed modest elevation of total cholesterol, non-HDL-C, LDL-C, healthy individuals with modest elevations of plasma triglyceride . and apoB. levels. Absolute and mean percent changes in . Methods . lipids and lipoproteins in the single . ascending dose cohorts . Detailed methods are presented in the Supplementary material online, . In the SAD cohorts of 10, 30, 60, 90, and 120 mg, median reductions Appendix. of 0, -42%, -73%, -81%, and -92% in apoC-III, and -12%, -7%, -42%, . Patient population and study design . -73%, and -77% in triglycerides were observed 14 days after dosing. Significant reductions were also noted in non-HDL-C in the 90 mg The objectives of the study performed in healthy subjects with ele- . and 120 mg doses, and VLDL-C in the 60 mg, 90 mg, and 120 mg vated triglycerides were the following: (i) to evaluate the safety and . doses, and apoB in the 120 mg dose, and increases in HDL-C in the tolerability of single and multiple doses of AKCEA-APOCIII-LRx . administered subcutaneously; (ii) to evaluate the pharmacokinetics of . 60 mg, 90 mg, and 120 mg doses (Table 2). The temporal relationships of changes in apoC-III, triglycerides, single and multiple subcutaneous doses of AKCEA-APOCIII-LRx;and . apoB, and HDL-C are shown in Figure 1A–D. Most of the effects (iii) to evaluate the effects of single and multiple doses of AKCEA- . APOCIII-LRx on pharmacodynamics (PD) including plasma apoC-III, . occurred by Day 8, with nadirs or peaks at Day 15 and then rever- triglycerides, total cholesterol (TC), low-density lipoprotein choles- . sions to baseline by days 120–150. terol (LDL-C), high-density lipoprotein cholesterol (HDL-C), non- . high-density lipoprotein cholesterol (non-HDL-C), and very low-dens- . Absolute and mean percent changes in . ity lipoprotein cholesterol (VLDL-C). lipids and lipoproteins in the multiple AKCEA-APOCIII-L is a second-generation ASO drug targeted . Rx . ascending dose cohorts to human APOC3 mRNA. AKCEA-APOCIII-LRx contains the same . 9 . nucleic acid sequence as the unconjugated volanesorsen, but add- . In MAD cohorts of 15 and 30 mg weekly and 60 mg every 4 weeks, . median reductions of -66%, -84%, and -89% in apoC-III, and -59%, itionally contains a triantennary N-acetyl galactosamine (GalNAc3) . complex at the 50 position
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