Treatment of pancreatic fibrosis with siRNA against a collagen-specific chaperone in vitamin A-coupled liposomes

Hirotoshi Ishiwatari, Yasushi Sato, Kazuyuki Murase, Akihiro Yoneda, Ryosuke Fujita, Hiroki Nishita, Naoko Kubo Birukawa, Tsuyoshi Hayashi, Tsutomu Sato, Koji Miyanishi, Rishu Takimoto, Masayoshi Kobune, Shigenori Ota, Yasutoshi Kimura, Koichi Hirata, Junji Kato, Yoshiro Niitsu

研究成果: Contribution to journalArticle査読

47 被引用数 (Scopus)

抄録

Background and objective Fibrosis associated with chronic pancreatitis is an irreversible lesion that can disrupt pancreatic exocrine and endocrine function. Currently, there are no approved treatments for this disease. We previously showed that siRNA against collagen-specific chaperone protein gp46, encapsulated in vitamin A-coupled liposomes (VA-lip-siRNAgp46), resolved fibrosis in a model of liver cirrhosis. This treatment was investigated for pancreatic fibrosis induced by dibutyltin dichloride (DBTC) and cerulein in rats. Methods Specific uptake of VA-lip-siRNAgp46, conjugated with 60-carboxyfluorescein (FAM) by activated pancreatic stellate cells (aPSCs), was analysed by fluorescence activated cell sorting (FACS). Intracellular distribution of VA-lip-siRNAgp46-FAM was examined by fluorescent microscopy. Suppression of gp46 expression by VA-lip-siRNAgp46 was assessed by immunoblotting. Collagen synthesis in aPSCs was assayed by dye-binding. Specific delivery of VA-lip-siRNAgp46 to aPSCs in DBTC rats was verified following intravenous VA-lip-siRNA-FAM and 3H-VA-lip-siRNAgp46. The effect of VA-lip-siRNA on pancreatic histology in DBTC- and cerulein-treated rats was determined by Azan-Mallory staining and hydroxyproline content. Results FACS analysis revealed specific uptake of VA-lipsiRNAgp46- FAM through the retinol binding protein receptor by aPSCs in vitro. Immunoblotting and collagen assay verified knockdown of gp46 and suppression of collagen secretion, respectively, by aPSCs after transduction of VA-lip-siRNAgp46. Specific delivery of VAlip- siRNAgp46 to aPSCs in fibrotic areas in DBTC rats was confirmed by fluorescence and radioactivity 24 h after the final injection. 10 systemic VA-lip-siRNAgp46 treatments resolved pancreatic fibrosis, and suppressed tissue hydroxyproline levels in DBTC- and cerulein-treated rats. Conclusion These data suggest the therapeutic potential of the present approach for reversing pancreatic fibrosis.

本文言語英語
ページ(範囲)1328-1339
ページ数12
ジャーナルGut
62
9
DOI
出版ステータス出版済み - 9 2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • 消化器病学

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