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Downregulated androgen receptor expression in preputial tissues of children with hypospadias
Zhilin Yang1, Peiliang Zhang2, Tiejun Zhang1
1Department of Urology and Laboratory of Pelvic Floor Muscle Function, Shenzhen Children's Hospital, Shenzhen, Guangdong, China.
Insights
Androgen receptor (AR) expression is reduced in the foreskin of boys with hypospadias. This finding suggests AR deficiency contributes to hypospadias development, resolving a long-standing scientific debate.
Area of Science:
- Urology
- Developmental Biology
- Endocrinology
Background:
- Hypospadias is a common congenital condition affecting the male urethra.
- Conflicting evidence exists regarding androgen receptor (AR) expression in hypospadias.
- Understanding AR's role is crucial for elucidating hypospadias pathogenesis.
Purpose of the Study:
- To investigate and clarify androgen receptor (AR) expression levels in the foreskin of children with hypospadias.
- To compare AR expression in hypospadias patients versus unaffected controls.
- To resolve discrepancies in the scientific literature concerning AR in hypospadias.
Main Methods:
- A comparative study involving 40 boys with isolated hypospadias and 40 age-matched controls.
- Analysis of preputial tissues using immunohistochemistry to detect AR.
- Quantification of AR immunoreactivity via average optical density (AOD).
Main Results:
- Androgen receptor (AR) immunoreactivity was primarily observed in the basal epithelial layer of the foreskin.
- Significantly lower AR expression was detected in hypospadias patients compared to controls (AOD 0.38 vs. 0.56).
- No significant difference in AR expression was found between proximal and distal hypospadias subtypes.
Conclusions:
- Reduced preputial AR expression in hypospadias suggests a deficiency in AR signaling contributes to the condition's development.
- This study provides key evidence to resolve the controversy surrounding AR's role in hypospadias pathogenesis.
- Findings highlight the importance of AR in male genital development.
Purpose:
To resolve conflicting evidence on androgen receptor (AR) expression in hypospadias, we compared preputial AR levels between affected children and controls.
Methods:
Forty patients with isolated hypospadias (age 2.9 ± 0.79 years, range 1.6-5.2 years) and 40 normal boys (age 3.2 ± 0.79 years, range 1.8-4.7 years) who underwent circumcision for phimosis were included in our study. Inner plates of preputial tissues were analyzed by immunohistochemistry for AR detection.
Results:
AR immunoreactivity was predominantly localized to the basal epithelial layer. Significantly reduced AR expression was observed in hypospadias patients vs. controls [average optical density (AOD), 0.38 ± 0.09 vs. 0.56 ± 0.11]. However, there was no difference in AR expression between the proximal and distal hypospadias (AOD, 0.40 ± 0.07 vs. 0.37 ± 0.10, P = 0.22).
Conclusions:
Preputial AR downregulation in hypospadias implicates AR deficiency in pathogenesis, providing evidence to resolve a key controversy in the field.
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