Document Detail

Gene transfer of TRPC6 (dominant negative) restores erectile function in diabetic rats.
MedLine Citation:
PMID:  20059667     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Transient receptor potential (TRP) channels play an important role in modulating intracellular Ca(2+) ([Ca(2+)](i)) levels.
AIM: We examined the hypothesis that overexpression of TRPC6(DN) (dominant negative) may contribute to decreased [Ca(2+)](i) levels in corporal smooth muscle (CSM). We also investigated whether gene transfer of TRPC6(DN) could restore erectile function in diabetic rats.
METHODS: For the in vitro study, the K(Ca), K(ATP), and TRPC6(DN) channel genes were transferred using cDNA, into cultured human CSM cells and human embryonic kidney cells. For the in vivo study, young adult rats were divided into three groups: normal controls; diabetic controls transfected with vector only; and a diabetic group transfected with pcDNA of the TRPC6(DN) gene.
MAIN OUTCOME MEASURES: After gene transfer, the effects of reducing [Ca(2+)](i) levels were assessed by Fura-2-based imaging analysis. The intracavernosal pressure (ICP) response to cavernosal nerve stimulation was assessed after intracorporal injection of TRPC6(DN) pcDNA. The transgene expression of the TRPC6(DN) was examined by reverse transcription polymerase chain reaction (RT-PCR) in rats transfected with TRPC6(DN) pcDNA.
RESULTS: Gene transfer of ion channels effectively reduced [Ca(2+)](i). Among these channels, transfer of the TRPC6(DN) gene resulted in the greatest reduction of [Ca(2+)](i) in human CSM. The mean (+/-standard error of the mean) ratio of ICP to mean arterial pressure (BP) in the gene-transfer rats was 79.4 +/- 2.4% (N = 8). This was significantly higher than that in control rats (55.6 +/- 3.7% [N = 8]), and similar to that in the young control rats (83 +/- 2.2% [N = 12]). The RT-PCR showed expression of TRPC6(DN) genes in the transfected rats.
CONCLUSION: Gene transfer of TRPC6(DN) not only reduced [Ca(2+)](i) in human CSM but also restored erectile function in diabetic rats. These results suggest that pcDNA transfer of TRPC6(DN) may represent a promising new form of therapy for the treatment of male erectile dysfunction in the future.
Jae Hun Jung; Byung Joo Kim; Mee Ree Chae; Sung Chul Kam; Ju-Hong Jeon; Insuk So; Ky Hyun Chung; Sung Won Lee
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-01-06
Journal Detail:
Title:  The journal of sexual medicine     Volume:  7     ISSN:  1743-6109     ISO Abbreviation:  J Sex Med     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-05-26     Completed Date:  2010-09-17     Revised Date:  2012-02-07    
Medline Journal Info:
Nlm Unique ID:  101230693     Medline TA:  J Sex Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1126-38     Citation Subset:  IM    
Department of Urology, Institute of Health Science, Gyeongsang National University School of Medicine, 92 Chilam-Dong, Jinju 660-751, Republic of Korea.
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MeSH Terms
Diabetes Complications / complications*
Disease Models, Animal
Erectile Dysfunction / etiology*,  therapy*
Gene Therapy / methods*
Gene Transfer Techniques / instrumentation*
TRPC Cation Channels / genetics*
Treatment Outcome
Reg. No./Substance:
0/TRPC Cation Channels; 0/Trpc6 protein, rat

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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