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Silencing histone deacetylase 2 using small hairpin RNA induces regression of fibrotic plaque in a rat model of P eyronie's disease
Author(s) -
Kwon KiDong,
Choi Min Ji,
Park JinMi,
Song KangMoon,
Kwon MiHye,
Batbold Dulguun,
Yin Guo Nan,
Kim Woo Jean,
Ryu JiKan,
Suh JunKyu
Publication year - 2014
Publication title -
bju international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.773
H-Index - 148
eISSN - 1464-410X
pISSN - 1464-4096
DOI - 10.1111/bju.12812
Subject(s) - small hairpin rna , small interfering rna , microbiology and biotechnology , gene silencing , histone deacetylase 2 , gene knockdown , chemistry , fibroblast , histone deacetylase , rna , cancer research , biology , apoptosis , histone , biochemistry , in vitro , dna , gene
Objectives To examine the therapeutic effect of adenovirus encoding histone deacetylase 2 ( HDAC2 ) small hairpin RNA ( Ad‐HDAC2 shRNA ) in a rat model of P eyronie's disease ( PD ) and to determine the mechanisms by which HDAC2 knockdown ameliorates fibrotic responses in primary fibroblasts derived from human PD plaque. Materials and Methods Rats were distributed into four groups ( n = 6 per group): age‐matched controls without treatment; rats in which PD has been induced ( PD rats) without treatment; PD rats receiving a single injection of control adenovirus encoding scrambled small hairpin RNA (Ad‐shRNA ) (day 15; 1 × 10 8 pfu/0.1 mL phosphate‐buffered saline [ PBS ]); and PD rats receiving a single injection of Ad‐HDAC2 shRNA (day 15; 1 × 10 8 pfu/0.1 mL PBS ) into the lesion. PD ‐like plaque was induced by repeated intratunical injections of 100 μL each of human fibrin and thrombin solutions on days 0 and 5. On day 30, the penis was harvested for histological examination. Fibroblasts isolated from human PD plaque were pretreated with HDAC2 small interfering (si) RNA (100 pmoL) and then stimulated with transforming growth factor ( TGF )‐β1 (10 ng/mL) to determine hydroxyproline levels, procollagen mRNA , apoptosis and protein expression of poly( ADP ‐ribose) polymerase 1 ( PARP1 ) and cyclin D1 . Results We observed that Ad‐HDAC2 shRNA decreased inflammatory cell infiltration, reduced transnuclear expression of phospho‐ S mad3 and regressed fibrotic plaque of the tunica albuginea in PD rats in vivo . siRNA ‐mediated silencing of HDAC2 significantly decreased the TGF ‐β1‐induced transdifferentiation of fibroblasts into myofibroblasts and collagen production, and induced apoptosis by downregulating the expression of PARP1 , and decreased the expression of cyclin D1 (a positive cell‐cycle regulator) in primary cultured fibroblasts derived from human PD plaque in vitro . Conclusion Specific inhibition of HDAC2 with RNA interference may represent a novel targeted therapy for PD .