Gene silencing of EXTL2 and EXTL3 as a substrate deprivation therapy for heparan sulphate storing mucopolysaccharidoses
| Autor: | Ainslie Derrick Roberts, Marleesa Ly, Sharon Byers, Donald S. Anson, Xenia Kaidonis, Wan Chin Liaw |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
T-Lymphocytes
Gene Products gag Biology N-Acetylglucosaminyltransferases Transfection Polymerase Chain Reaction Article Small hairpin RNA Genes Reporter RNA interference Gene expression Genetics Humans Gene silencing Gene Silencing Child Genetics (clinical) DNA Primers Regulation of gene expression Reporter gene Membrane Proteins Substrate Deprivation Therapy Mucopolysaccharidoses Molecular biology Cell biology Gene Expression Regulation RNA Heparitin Sulfate Lysosomes |
| Zdroj: | European Journal of Human Genetics. 18:194-199 |
| ISSN: | 1476-5438 1018-4813 |
| Popis: | Neurological pathology is characteristic of the mucopolysaccharidoses (MPSs) that store heparan sulphate (HS) glycosaminoglycan (gag) and has been proven to be refractory to systemic therapies. Substrate deprivation therapy (SDT) using general inhibitors of gag synthesis improves neurological function in mouse models of MPS, but is not specific to an MPS type. We have investigated RNA interference (RNAi) as a method of targeting SDT to the HS synthesising enzymes, EXTL2 and EXTL3. Multiple shRNA molecules specific to EXTL2 or EXTL3 were designed and validated in a reporter gene assay, with four out of six shRNA constructs reducing expression by over 90%. The three EXTL2-specific shRNA constructs reduced endogenous target gene expression by 68, 32 and 65%, and decreased gag synthesis by 46, 50 and 27%. One EXTL3-specific shRNA construct reduced endogenous target gene expression by 14% and gag synthesis by 39%. Lysosomal gag levels in MPS IIIA and MPS I fibroblasts were also reduced by EXTL2 and EXTL3-specific shRNA. Incorporation of shRNAs into a lentiviral expression system reduced gene expression, and one EXTL2-specific shRNA reduced gag synthesis. These results indicate that deprivation therapy through shRNA-mediated RNAi has potential as a therapy for HS-storing MPSs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|