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Antisense oligonucleotide reduces plasma levels of apolipoprotein (a) and lipoprotein (a) in transgenic mice

This study explores the use of antisense oligonucleotide to lower levels of apolipoprotein (a) (apo(a)) and lipoprotein (a) (Lp(a)) in transgenic mouse models. Elevated Lp(a) is a risk factor for cardiovascular disease, and current therapies to lower its levels are lacking. The study demonstrates that the antisense oligonucleotide significantly reduces Lp(a) and apo(a) levels in the mouse models, providing a potential specific therapy for lowering plasma Lp(a) levels.

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Antisense oligonucleotide reduces plasma levels of apolipoprotein (a) and lipoprotein (a) in transgenic mice

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  1. Antisense oligonucleotide lowers plasma levels of apolipoprotein (a) and lipoprotein (a) in transgenic mice Esther Merki* PhD, Mark Graham& BS, Adam Taleb* MD, Gregor Leibundgut* MD, Xiaohong Yang* BS, Elizabeth R. Miller* BS, Wuxia Fu& MS, Adam E. Mullick& PhD, Richard Lee& PhD, Peter Willeit*† MD, Rosanne M. Crooke& PhD, Joseph L. Witztum* MD, Sotirios Tsimikas* MD From the *Department of Medicine, University of California San Diego, †Department of Public Health and Primary Care, University of Cambridge, Cambridge, England, and &Isis Pharmaceuticals, Inc.

  2. Disclosures Funding Sources This study was supported by a grant from the Fondation Leducq (JLW, ST) and an unrestricted gift from Isis Pharmaceuticals to the University of California, San Diego (ST). Conflict of Interest Disclosures Drs. Witztum and Tsimikas are named as inventors in patents and patent applications from the University of California, San Diego for the potential commercial use of antibodies to oxidized LDL and serve as consultants to Isis Pharmaceuticals, Inc. Dr. Witztum also a consultant to Amira Pharmaceutical and to Lpath, Inc. He has equity in Atherotype, Inc. Drs Lee and Fu receive compensation and stock from Isis Pharmaceuticals, Inc. Dr. Cooke is an employee of Isis Pharmaceuticals, Inc.

  3. Objectives To assess whether an antisense oligonucleotide (ASO) directed to apolipoprotein (a) [apo(a)] reduces apo(a) and lipoprotein (a) [Lp(a)] levels in transgenic mouse models. J Am Coll Cardiol 2011;57:1611-1621

  4. Background Elevated Lp(a) is a causal, independent, genetic risk factor for cardiovascular disease and myocardial infarction. Effective therapies to specifically lower plasma Lp(a) levels are lacking. J Am Coll Cardiol 2011;57:1611-1621

  5. Methods • Three transgenic mouse models were utilized: • 8K-apo(a) mice expressing 8 kringle(K) IV repeats with a single copy of KIV-2; • 8K-Lp(a) mice expressing both the 8K apo(a) plus human apolipoprotein B-100; and • 12K-apo(a) mice expressing a 12K apo(a) with 3 KIV-2 repeats. • The mice were treated intraperitoneally with saline, a control ASO or ASO 144367 directed to KIV-2 for 4-6 weeks. • Apo(a), Lp(a) and oxidized phospholipids present on human apoB (OxPL/h-apoB) or apo(a) [OxPL/apo(a)] were measured at baseline and on and off therapy. J Am Coll Cardiol 2011;57:1611-1621

  6. Results • ASO 144367 significantly reduced Lp(a) by 24.8% in 8K-Lp(a) mice, and reduced apo(a) levels by 19.2% in 8K-Lp(a) mice, 30.0% in 8K-apo(a) mice and 86% in 12K-apo(a) mice • ASO 144367 also significantly reduced OxPL/apoB 22.4% in 8K-Lp(a) mice, and OxPL/apo(a) levels by 19.9% in 8K-Lp(a) mice, 22.1% in 8K-apo(a) mice and 92.5% in 12K- apo(a) mice (P<0.004 or less for all). • No significant changes occurred in Lp(a), apo(a), OxPL/apoB or OxPL/apo(a) levels with control ASO or saline. J Am Coll Cardiol 2011;57:1611-1621

  7. Table 1. Baseline levels of lipid and oxidation variables J Am Coll Cardiol 2011;57:1611-1621

  8. Effect of ASO 144367 on hepatic apo(a) mRNA expression in 8K-apo(a) and 8K-Lp(a) mice combined (A) and in 12K-apo(a) mice J Am Coll Cardiol 2011;57:1611-1621

  9. Table 2. Lipoprotein profiles of 8K-Lp(a) and 8K-apo(a) mice following treatment with ASO 144367 Values are in mg/dl and represent meansSD. P-ANOVA represents repeated measures ANOVA for the 5 timepoints for each variable. * p<0.001, ** p<0.01 and *** p<0.05 compared to baseline values within each group with Bonferroni multiple comparisons test. J Am Coll Cardiol 2011;57:1611-1621

  10. Table 2. Lipoprotein profiles of 8K-Lp(a) and 8K-apo(a) mice following treatment with ASO 144367 Values are in mg/dl and represent meansSD. P-ANOVA represents repeated measures ANOVA for the 5 timepoints for each variable. * p<0.001, ** p<0.01 and *** p<0.05 compared to baseline values within each group with Bonferroni multiple comparisons test. J Am Coll Cardiol 2011;57:1611-1621

  11. Changes in apo(a) and Lp(a) levels in 8K-Lp(a) and 8K-apo(a) mice in response to ASO 144367 J Am Coll Cardiol 2011;57:1611-1621

  12. Changes in OxPL/h-apoB and OxPL/apo(a) in 8K-Lp(a) mice in response to ASO 144367 J Am Coll Cardiol 2011;57:1611-1621

  13. Changes in apo(a)/m-apoB and OxPL/m-apoB in 8K-apo(a) mice and 8K-Lp(a) mice in response to ASO 144367 J Am Coll Cardiol 2011;57:1611-1621

  14. Table 3. Apo(a), OxPL/apo(a), apo(a)/m-apoB and OxPL/m-apoB levels in 12K-apo(a) mice Apo(a) values are in relative light units (RLU) and represent meansSD. P-ANOVA represents repeated measures ANOVA for the 3 timepoints for each variable. * p<0.001, ** p<0.01 and *** p<0.05 compared to baseline values within each group with Bonferroni multiple comparisons test J Am Coll Cardiol 2011;57:1611-1621

  15. Mean percent change in apo(a) levels (A), OxPL/apo(a) (B), apo(a)/m-apoB (C) and OxPL/m-apoB (D) in 12K-apo(a) mice in response to ASO 144367 J Am Coll Cardiol 2011;57:1611-1621

  16. Conclusion • This study documents the first specific therapy for lowering apo(a)/Lp(a) levels and their associated OxPL. • A more potent effect was documented in mice expressing apo(a) with multiple KIV-2 repeats. • Targeting liver expression of apo(a) with ASOs directed to KIV-2 repeats may provide an effective approach to lower elevated Lp(a) levels in humans. J Am Coll Cardiol 2011;57:1611-1621

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