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Mice that express enzymatically inactive cathepsin L exhibit abnormal spermatogenesis
William W Wright1, Liam Smith, Candace Kerr
1Department of Biochemistry and Molecular Biology, The Johns Hopkins University Bloomberg School of Public Health, Baltimore, Maryland 21205-2179, USA. wwright 1@jhem.jhmi.edu
Biology of Reproduction
|January 21, 2003
Summary
Procathepsin L is crucial for male fertility, preventing testicular atrophy and supporting germ cell development. Its absence significantly impairs spermatogenesis and tubule health.
Area of Science:
- Reproductive Biology
- Cell Biology
- Molecular Endocrinology
Background:
- Sertoli cells in the testes secrete procathepsin L in a stage-specific manner.
- This secretion pattern suggests a role for procathepsin L in spermatogenic cell function.
Purpose of the Study:
- To investigate the role of catalytically active cathepsin L in spermatogenesis using a mouse model.
- To determine if procathepsin L is essential for germ cell survival, replication, and differentiation.
Main Methods:
- Validated mouse Sertoli cells express cathepsin L mRNA and secrete procathepsin L similarly to rat cells.
- Examined testes morphology and germ cell counts in mice with inactive cathepsin L (furless mice) versus controls.
- Quantified seminiferous tubule atrophy and germ cell populations (preleptotene spermatocytes, pachytene spermatocytes, round spermatids).
Main Results:
- Lack of functional cathepsin L led to a 12-fold increase in seminiferous tubule atrophy.
- A 16% reduction in preleptotene spermatocyte formation was observed.
- A 25% reduction in the differentiation of preleptotene into pachytene spermatocytes occurred.
Conclusions:
- Procathepsin L plays a dual role in testicular function: preventing tubule atrophy and promoting germ cell development.
- Catalytically active cathepsin L is essential for maintaining testicular structure and supporting spermatogenesis.