MiR-181a Promotes Spermatogenesis by Targeting the S6K1 Pathway
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Updated: Nov 8, 2025
A Seminiferous Tubule Squash Technique for the Cytological Analysis of Spermatogenesis Using the Mouse Model
Published on: February 6, 2018
Lei Wang1, Juan Sun2, Jin Han1
1Reproductive Medical Center, Zaozhuang Maternal and Child Health Hospital, Zaozhuang, China.
Abstract:
Approximately 15% of couples suffer from infertility worldwide, and male factors contribute to about 30% of total sterility cases. However, there is little progress in treatments due to the obscured understanding of underlying mechanisms. Recently microRNAs have emerged as a key player in the process of spermatogenesis. Expression profiling of miR-181a was carried out in murine testes and spermatocyte culture system. In vitro cellular and biochemical assays were used to examine the effect of miR-181a and identify its target S6K1, as well as elucidate the function with chemical inhibitor of S6K1. Human testis samples analysis was employed to validate the findings. miR-181a level was upregulated during mouse spermatogenesis and knockdown of miR-181a attenuated the cell proliferation and G1/S arrest and increased the level of S6K1, which was identified as a downstream target of miR-181a. Overexpression of S6K1 also led to growth arrest of spermatocytes while inhibitor of S6K1 rescued the miR-181a knockdown-mediated cell proliferation defect. In human testis samples of azoospermia patients, low level of miR-181a was correlated with defects in the spermatogenic process. miR-181a is identified as a new regulator and high level of miR-181a contributes to spermatogenesis via targeting S6K1.
Insights
MicroRNA-181a (miR-181a) is crucial for male fertility, regulating spermatogenesis by targeting S6K1. Low miR-181a levels are linked to infertility in men.
Area of Science:
- Reproductive Biology
- Molecular Endocrinology
- Spermatogenesis Regulation
Background:
- Male infertility affects approximately 15% of couples globally, with male factors contributing to 30% of cases.
- Understanding the molecular mechanisms of spermatogenesis is critical for developing effective infertility treatments.
- MicroRNAs (miRNAs) are increasingly recognized as key regulators in male reproductive processes.
Purpose of the Study:
- To investigate the role of microRNA-181a (miR-181a) in spermatogenesis.
- To identify downstream targets of miR-181a and elucidate its regulatory pathway.
- To validate the findings in human infertility samples.
Main Methods:
- Expression profiling of miR-181a in murine testes and spermatocyte cultures.
- In vitro cellular and biochemical assays to determine miR-181a function and identify its target, S6K1.
- Chemical inhibition of S6K1 to study its interaction with miR-181a.
- Analysis of human testis samples from azoospermia patients.
Main Results:
- miR-181a expression is upregulated during mouse spermatogenesis.
- Knockdown of miR-181a impaired spermatocyte proliferation and caused G1/S arrest, increasing S6K1 levels.
- S6K1 was confirmed as a direct downstream target of miR-181a.
- S6K1 overexpression induced growth arrest, while S6K1 inhibition rescued miR-181a knockdown effects.
- Low miR-181a levels in human azoospermia samples correlated with spermatogenic defects.
Conclusions:
- miR-181a acts as a novel regulator of spermatogenesis.
- Elevated miR-181a levels promote spermatogenesis by targeting and downregulating S6K1.
- Dysregulation of miR-181a may contribute to male infertility.
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