Abstract:
OBJECTIVES:siRNA-induced gene silencing in the salivary gland using microbubble-enhanced sonoporation was used to develop an in vivo gene knockdown technique. METHODS:siRNA targeting rat glyceraldehyde-3-phosphate dehydrogenas (GAPDH) was mixed with echo-enhanced microbubbles and reverse-injected into rat parotid glands using transdermal ultrasound. To compare direct and transdermal ultrasound efficiencies, an incision was made on the lateral neck to expose the parotid glands for direct application. The efficiency of gene suppression was determined using quantitative reverse transcription-polymerase chain reaction 24-72 h after siRNA delivery. Cytotoxicity was assessed using histological analysis. RESULTS:Expression of rat GAPDH in the parotid glands was silenced 48 h after siRNA was delivered by ultrasound (frequency: 1 MHz; intensity: 2 W cm(-2); exposure time: 2 min). High-intensity ultrasound induced tissue damage and apoptotic change. Echo-enhanced microbubbles significantly improved siRNA-induced gene silencing by 10-50%. Compared with transdermal application, direct-exposure ultrasound was only slightly effective, and no significant difference in gene expression was observed. CONCLUSION:The results indicate that microbubble-enhanced sonoporation can yield in vivo siRNA gene silencing in the rat parotid gland. This technique could be applied to provide gene knockdown organs for functional genomic analyses and to develop siRNA-based gene therapy.
journal_name
Oral Disjournal_title
Oral diseasesauthors
Sakai T,Kawaguchi M,Kosuge Ydoi
10.1111/j.1601-0825.2009.01579.xsubject
Has Abstractpub_date
2009-10-01 00:00:00pages
505-11issue
7eissn
1354-523Xissn
1601-0825pii
ODI1579journal_volume
15pub_type
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