Lin28a induced mitochondrial dysfunction in human granulosa cells via suppressing LARS2 expression
1Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450001, China.
Cellular Signalling
|November 27, 2022
Summary
Lin28a protein suppresses mitochondrial function in granulosa cells by reducing LARS2 expression, impacting female fertility. Silencing Lin28a improves mitochondrial health and estrogen production.
Area of Science:
- Reproductive Biology
- Cellular Metabolism
- Mitochondrial Function
Background:
- Granulosa cells are crucial for oocyte development and steroidogenesis.
- Mitochondria regulate granulosa cell function and metabolic needs.
- Lin28a's role in female fertility and germ cell development is known, but its effect on granulosa cell mitochondria and steroidogenesis is unclear.
Purpose of the Study:
- To investigate the role of Lin28a in regulating mitochondrial function and steroidogenesis in human granulosa cells.
- To explore the relationship between Lin28a, LARS2 expression, and mitochondrial health.
- To understand the molecular mechanisms by which Lin28a affects female fertility.
Main Methods:
- Overexpression and suppression of Lin28a in immortal human granulosa cells (HGrC1).
- Measurement of estrogen levels, ATP content, mitochondrial membrane potential, and Glutathione (GSH).
- Analysis of LARS2 expression, Pgc1α and Nrf2 mRNA levels, and Lin28a binding to Lars2 mRNA.
Main Results:
- Lin28a overexpression decreased estrogen, ATP, mitochondrial membrane potential, and GSH levels.
- Lin28a suppression had opposite effects, enhancing these parameters.
- LARS2 overexpression reversed Lin28a-induced mitochondrial dysfunction and estrogen reduction.
- Lin28a directly suppressed Lars2 translation, and LARS2 overexpression upregulated Pgc1α and Nrf2 mRNA.
Conclusions:
- Lin28a overexpression induces mitochondrial dysfunction in granulosa cells by suppressing LARS2 expression.
- This mechanism provides new insights into how Lin28a regulates granulosa cell function and influences female fertility.
- Targeting the Lin28a-LARS2 pathway may offer therapeutic strategies for fertility preservation or enhancement.
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