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Protein transduction therapy into cochleae via the round window niche in guinea pigs.


ABSTRACT: Cell-penetrating peptides (CPPs) are short sequences of amino acids that facilitate the penetration of conjugated cargoes across mammalian cell membranes, and as such, they may provide a safe and effective method for drug delivery to the inner ear. Simple polyarginine peptides have been shown to induce significantly higher cell penetration rates among CPPs. Herein, we show that a peptide consisting of nine arginines ("9R") effectively delivered enhanced green fluorescent protein (EGFP) into guinea pig cochleae via the round window niche without causing any deterioration in auditory function. A second application, 24 hours after the first, prolonged the presence of EGFP. To assess the feasibility of protein transduction using 9R-CPPs via the round window, we used "X-linked inhibitor of apoptosis protein" (XIAP) bonded to a 9R peptide (XIAP-9R). XIAP-9R treatment prior to acoustic trauma significantly reduced putative hearing loss and the number of apoptotic hair cells loss in the cochleae. Thus, the topical application of molecules fused to 9R-CPPs may be a simple and promising strategy for treating inner ear diseases.

SUBMITTER: Takeda H 

PROVIDER: S-EPMC4988354 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Protein transduction therapy into cochleae via the round window niche in guinea pigs.

Takeda Hiroki H   Kurioka Takaomi T   Kaitsuka Taku T   Tomizawa Kazuhito K   Matsunobu Takeshi T   Hakim Farzana F   Mizutari Kunio K   Miwa Toru T   Yamada Takao T   Ise Momoko M   Shiotani Akihiro A   Yumoto Eiji E   Minoda Ryosei R  

Molecular therapy. Methods & clinical development 20160817


Cell-penetrating peptides (CPPs) are short sequences of amino acids that facilitate the penetration of conjugated cargoes across mammalian cell membranes, and as such, they may provide a safe and effective method for drug delivery to the inner ear. Simple polyarginine peptides have been shown to induce significantly higher cell penetration rates among CPPs. Herein, we show that a peptide consisting of nine arginines ("9R") effectively delivered enhanced green fluorescent protein (EGFP) into guin  ...[more]

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