Effective Small Interfering RNA Therapy to Treat CLCN7-dependent Autosomal Dominant Osteopetrosis Type 2

Molecular Therapy. Nucleic Acids
Mattia CapulliAnna Teti

Abstract

In about 70% of patients affected by autosomal dominant osteopetrosis type 2 (ADO2), osteoclast activity is reduced by heterozygous mutations of the CLCN7 gene, encoding the ClC-7 chloride/hydrogen antiporter. CLCN7(G215R)-, CLCN7(R767W)-, and CLCN7(R286W)-specific siRNAs silenced transfected mutant mRNA/EGFP in HEK293 cells, in RAW264.7 cells and in human osteoclasts, with no change of CLCN7(WT) mRNA and no effect of scrambled siRNA on the mutant transcripts. Osteoclasts from Clcn7(G213R) ADO2 mice showed reduced bone resorption, a condition rescued by Clcn7(G213R)-specific siRNA. Treatment of ADO2 mice with Clcn7(G213R)-specific siRNA induced increase of bone resorption variables and decrease of trabecular bone mass, leading to an overall improvement of the osteopetrotic bone phenotype. Treatment did not induce overt adverse effects and was effective also with siRNAs specific for other mutants. These results demonstrate that a siRNA-based experimental treatment of ADO2 is feasible, and underscore a translational impact for future strategy to cure this therapeutically neglected form of osteopetrosis.

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Citations

Jun 1, 2016·Frontiers in Pharmacology·Paola ImbriciDiana Conte
May 31, 2018·Physiological Reviews·Thomas J Jentsch, Michael Pusch
Mar 7, 2019·Frontiers in Endocrinology·Sara PennaAnna Villa
Dec 12, 2020·Frontiers in Cell and Developmental Biology·Hui PengTing Wen
Nov 10, 2020·Frontiers in Endocrinology·Katerina Trajanoska, Fernando Rivadeneira

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Methods Mentioned

BETA
transfection
PCR
electrophoresis
ELISA

Software Mentioned

Skyscan Nrecon

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