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Gene expression profiling of an arteriogenic impotence model
1Knuppe Molecular Urology Laboratory, School of Medicine, University of California at San Francisco, San Francisco, CA 94143-1695, USA. clin@urol.ucsf.edu
Biochemical and Biophysical Research Communications
|July 11, 2001
Summary
Penile arterial insufficiency, a common cause of erectile dysfunction (ED), was studied in a rat model. Gene expression changes in the corpus cavernosum revealed specific molecular responses to arterial ligation, highlighting apolipoprotein D and insulin-like growth factor binding proteins.
Area of Science:
- Reproductive Biology
- Molecular Biology
- Vascular Biology
Background:
- Penile arterial insufficiency is a primary cause of erectile dysfunction (ED).
- Understanding the molecular mechanisms underlying ED is crucial for developing effective treatments.
- Rat models are essential for studying complex physiological and pathological processes.
Purpose of the Study:
- To establish and characterize a rat model of traumatic arteriogenic insufficiency.
- To investigate the differential gene expression in the corpus cavernosum following pudendal artery ligation.
- To identify specific genes and pathways involved in the development of ED due to arterial insufficiency.
Main Methods:
- A traumatic arteriogenic insufficiency rat model was created by ligating pudendal arteries for various durations (6 hours to 6 weeks).
- Intracavernous pressure was measured via electrostimulation of the cavernous nerve.
- Microarray analysis was performed on corpus cavernosum tissue to assess gene expression changes (1176-gene array).
Main Results:
- Ligation significantly reduced intracavernous pressure compared to controls.
- Approximately 25 genes showed differential expression, varying with ligation duration.
- Apolipoprotein D (ApoD) was highly upregulated, peaking at 3 and 7 days.
- Insulin-like growth factor binding proteins (IGFBP-1, 3, 5) were upregulated, while IGFBP-6 was downregulated.
- Cathepsin K expression was decreased, and angiotensin-converting enzyme was upregulated in chronic models.
- Vascular endothelial growth factor (VEGF) was notably not induced in the corpus cavernosum.
Conclusions:
- The rat model effectively simulates penile arterial insufficiency and associated ED.
- Specific gene expression patterns, including ApoD and IGFBPs, are characteristic of this condition.
- The lack of VEGF induction suggests unique molecular responses in penile tissue compared to other ischemic tissues.
- These findings provide insights into the molecular basis of ED and potential therapeutic targets.