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Small Interfering Ribonucleic Acid as Lipid-Lowering Therapy: Inclisiran in Focus

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MDPI
DOI: 10.3390/ijms24066012

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siRNA; small interfering RNA; inclisiran; LDL cholesterol; PCSK9

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The PCSK9 enzyme interferes with LDL cholesterol metabolism. Inhibiting PCSK9 lowers LDL cholesterol levels. Monoclonal antibodies targeting PCSK9 have shown strong and persistent effects, but require frequent subcutaneous injections. Inclisiran, a synthesized siRNA, inhibits PCSK9 synthesis and provides sustained LDL cholesterol lowering with twice-yearly applications.
The PCSK9 (Proprotein Convertase Subtilisin/Kexin type 9) enzyme interferes with the metabolism of low-density lipoprotein (LDL) cholesterol. Inhibition of PCSK9 results in lower LDL cholesterol levels, which can be achieved by different molecular pathways. Monoclonal antibodies targeting circulating PCSK9 have shown strong and persistent effects on lowering the LDL cholesterol level, while reducing the risk of future cardiovascular events. However, this therapy requires once- or twice-monthly administration in the form of subcutaneous injection. This dosing regimen might impact the therapy adherence in cardiovascular patients who often require multiple drugs with different dosing intervals. Small interfering ribonucleic acid (siRNA) represents a promising therapy approach for patients with elevated LDL cholesterol level despite optimized background statin therapy. Inclisiran is a synthesized siRNA which inhibits PCSK9 synthesis in the liver and provides sustained and durable lowering of LDL cholesterol with twice-yearly application and a good tolerability profile. Herein, we present an overview of the current available data and critical review of the major clinical trials which assessed safety and efficacy of inclisiran in different groups of patients with elevated LDL cholesterol level.

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