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Updated: May 11, 2026

A High-Throughput Luciferase Assay to Evaluate Proteolysis of the Single-Turnover Protease PCSK9
Published on: August 28, 2018
PCSK9 inhibitors
1Department of Lipidology, Point Medical, Dijon, France. michelfarnier@nerim.net
Purpose Of Review:
To summarize the therapeutic strategies to inhibit PCSK9 and to describe the main results obtained in phase I and II trials with monoclonal antibodies targeting PCSK9.
Recent Findings:
Among the various approaches for PCSK9 inhibition, human data are only available for inhibition of PCSK9 binding to LDL receptor by monoclonal antibodies. Promising preclinical studies have also been reported with other strategies, including inhibition of PCSK9 synthesis by gene silencing agents. The two most advanced monoclonal antibodies in development are SAR236553/REGN727 and AMG145. In phase II, these two monoclonal antibodies administered subcutaneously are well tolerated and effective to decrease atherogenic lipoproteins. A dramatic decrease in LDL cholesterol up to 70% can be obtained. The efficacy has been evaluated so far in addition to statins in hypercholesterolemic patients with or without familial hypercholesterolemia, in patients with intolerance to statin therapy and in monotherapy.
Summary:
The short-term efficacy, safety and tolerability of two monoclonal antibodies to PSCK9 have been demonstrated in several phase II trials. These PCSK9 inhibitors are now tested in larger phase III studies to provide insights into the long-term safety and clinical efficacy of this very promising approach.
Insights
Monoclonal antibodies targeting PCSK9 effectively lower LDL cholesterol by up to 70% in early trials. These PCSK9 inhibitors show promise for managing hypercholesterolemia, with larger studies underway.
Area of Science:
- Cardiovascular Medicine
- Pharmacology
- Biotechnology
Background:
- Proprotein convertase subtilisin/kexin type 9 (PCSK9) plays a key role in regulating LDL cholesterol levels.
- Inhibition of PCSK9 offers a novel therapeutic strategy for hypercholesterolemia.
Purpose of the Study:
- To review therapeutic strategies for inhibiting PCSK9.
- To summarize Phase I and II trial results of monoclonal antibodies targeting PCSK9.
Main Methods:
- Review of preclinical and clinical trial data for PCSK9 inhibitors.
- Focus on monoclonal antibodies (SAR236553/REGN727 and AMG145) targeting PCSK9-LDL receptor interaction.
- Analysis of data from Phase II trials in hypercholesterolemic patients.
Main Results:
- Monoclonal antibodies targeting PCSK9 are well-tolerated and effective in reducing atherogenic lipoproteins.
- Significant reductions in LDL cholesterol (up to 70%) observed with PCSK9 inhibition.
- Efficacy demonstrated in various patient groups, including those with familial hypercholesterolemia and statin intolerance.
Conclusions:
- Short-term efficacy, safety, and tolerability of PCSK9 monoclonal antibodies are established in Phase II trials.
- PCSK9 inhibitors are advancing to Phase III studies to assess long-term safety and clinical outcomes.
- This approach represents a highly promising therapeutic strategy for managing cholesterol levels.
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