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Updated: Apr 15, 2026
A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
Published on: February 6, 2018
MTCH2 is differentially expressed in rat testis and mainly related to apoptosis of spermatocytes
Andrés Goldman1, Rosana Rodríguez-Casuriaga, Evangelina González-López
1Departamento de Biología Molecular, Instituto de Investigaciones Biológicas Clemente Estable (IIBCE), Avda. Italia 3318, Montevideo, 11600, Uruguay.
Abstract:
MTCH2 has been described in liver as a protein involved in the intrinsic apoptotic pathway, although new evidence also associates this protein with cellular metabolism. In this work, the expression of MTCH2 in testis (an organ in which high levels of apoptosis normally take place as part of the spermatogenic process) is analyzed in rat, both at the mRNA and at the protein levels. Our results showed that MTCH2 was highly expressed in testis compared with other tissues and was differentially expressed according to developmental stage and testicular cell type. Protein expression was initially detected during the first spermatogenic wave at the time of meiosis onset and its levels increased in adulthood, with the highest expression levels being detected in meiotic prophase I. Specific differences in MTCH2 expression levels at the various stages of the adult seminiferous epithelium were also observed. Co-staining with TUNEL revealed a differential MTCH2 staining pattern in TUNEL-positive cells, mainly in dying primary spermatocytes, i.e., meiotic prophase I cells. Furthermore, upon mild hyperthermia (treatment shown to increase apoptosis in testis), MTCH2 levels rose concomitantly with a massive appearance of TUNEL-positive cells within the seminiferous tubules; these cells exhibited a differential MTCH2 distribution. Thus, MTCH2 is related to testicular apoptosis, especially during meiotic prophase.
Insights
Mitochondrial outer membrane protein 2 (MTCH2) is highly expressed in rat testes and is linked to testicular apoptosis, particularly during meiosis. Its levels increase with heat-induced stress, indicating a role in programmed cell death during spermatogenesis.
Area of Science:
- Reproductive Biology
- Cell Biology
- Molecular Biology
Background:
- Mitochondrial outer membrane protein 2 (MTCH2) is known for its role in apoptosis and cellular metabolism in the liver.
- Testes normally exhibit high apoptosis rates during spermatogenesis, making them a relevant model for studying apoptosis-related proteins.
Purpose of the Study:
- To investigate the expression and function of MTCH2 in rat testes.
- To determine the relationship between MTCH2 and testicular apoptosis during spermatogenesis.
Main Methods:
- Analysis of MTCH2 mRNA and protein expression in rat testes across different developmental stages and cell types.
- Immunohistochemistry and TUNEL staining to co-localize MTCH2 with apoptotic cells.
- Evaluation of MTCH2 expression changes following hyperthermia-induced testicular stress.
Main Results:
- MTCH2 is highly expressed in rat testes compared to other tissues.
- MTCH2 expression is developmentally regulated, appearing at meiosis onset and increasing in adulthood, with peak levels in meiotic prophase I.
- MTCH2 is localized in dying primary spermatocytes (meiotic prophase I) and its levels rise with hyperthermia-induced apoptosis.
Conclusions:
- MTCH2 plays a significant role in testicular apoptosis, especially during meiotic prophase I.
- The expression pattern of MTCH2 suggests its involvement in regulating programmed cell death during spermatogenesis.
- MTCH2 may be a potential biomarker for testicular apoptosis and response to stress.
