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Loss of Insl3: a potential predisposing factor for testicular torsion
Selami Sozubir1, Theodore Barber, Yi Wang
1Department of Urology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9110, USA.
The Journal of Urology
|April 20, 2010
Summary
Insulin-like 3 (Insl3) deficiency in mice causes gubernacular defects, leading to intra-abdominal testes and spermatic cord torsion. This condition increases with lower Insl3 levels, impacting testicular health and descent.
Area of Science:
- Reproductive biology
- Developmental biology
- Endocrinology
Background:
- Insulin-like 3 (Insl3) is a testicular hormone crucial for mammalian gubernacular development and testicular descent.
- Insl3 knockout mice exhibit cryptorchidism, indicating its essential role in normal testicular positioning.
Purpose of the Study:
- To conduct a detailed anatomical analysis of the vas deferens and testes in Insl3 mutant mice.
- To further characterize the anomalies associated with Insl3 deficiency, particularly concerning testicular descent and spermatic cord development.
Main Methods:
- Examination of Insl3 wild-type, heterozygous, and knockout male mice at prepubertal and adult stages.
- Macroscopic assessment of testes and spermatic cord appearance, characteristics, and mobility.
Main Results:
- 94% of Insl3 knockout testes remained intra-abdominal, with delayed descent in heterozygotes.
- Vas deferens elongation/convolution and spermatic cord twisting occurred in 65% of knockout and 27% of heterozygous testes.
- Testicular pathology, including torsion, atrophy, and vanishing testes, increased with reduced Insl3 levels and age.
Conclusions:
- Insl3 deficiency leads to gubernacular defects, increased testicular mobility, and spermatic cord anomalies, resulting in delayed descent and torsion in a gene-dose-dependent manner.
- Prepubertal torsion in Insl3 mutants contributes to testicular atrophy and vanishing testes in adulthood.
- Insl3 is implicated as a key signaling molecule in human testicular descent disorders and torsion.
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