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Nonesterified fatty acids modulate steroidogenesis in mouse Leydig cells
A W Meikle1, S J Benson, X H Liu
1Department of Internal Medicine, University of Utah School of Medicine, Salt Lake City 84132.
The American Journal of Physiology
|December 1, 1989
Summary
Nonesterified fatty acids (NEFA) significantly inhibit testosterone production in mouse Leydig cells. This inhibition affects steroidogenesis before cholesterol conversion and is reversible.
Area of Science:
- Endocrinology
- Reproductive Biology
- Cellular Metabolism
Background:
- Leydig cells are crucial for testosterone synthesis, regulated by luteinizing hormone (LH).
- Nonesterified fatty acids (NEFA) are implicated in metabolic processes, but their direct impact on Leydig cell function is not fully understood.
Purpose of the Study:
- To investigate the effects of NEFA on testosterone synthesis in isolated adult mouse Leydig cells.
- To determine the specific mechanisms and pathways involved in NEFA-mediated modulation of steroidogenesis.
Main Methods:
- Isolated adult mouse Leydig cells were treated with luteinizing hormone (LH) and varying concentrations of NEFA.
- Effects on testosterone production were measured, along with responses to 8-Bromoadenosine 3',5'-cyclic monophosphate (8-BrcAMP), Ca2+ modulation, and 22(R)-hydroxycholesterol.
Main Results:
- NEFA, particularly oleic acid, significantly inhibited LH-stimulated testosterone production in a dose-dependent manner.
- The inhibitory effect of NEFA was independent of cAMP but dependent on extracellular Ca2+, with verapamil enhancing inhibition.
- 22(R)-hydroxycholesterol reversed NEFA-induced inhibition, suggesting a block before pregnenolone synthesis.
Conclusions:
- NEFA are potent inhibitors of testosterone synthesis in Leydig cells, acting at a pre-pregnenolone step.
- The findings highlight NEFA as key modulators of Leydig cell steroidogenesis, with implications for reproductive health.