Interleukin-1 inhibits Leydig cell steroidogenesis without affecting steroidogenic acute regulatory protein messenger ribonucleic acid or protein levels

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Interleukin-1 inhibits Leydig cell steroidogenesis without affecting steroidogenic acute regulatory protein messenger ribonucleic acid or protein levels.

The rate-limiting step of steroidogenesis is the transport of the substrate cholesterol from the outer to the inner mitochondrial membrane which involves a cycloheximide-sensitive newly synthesized protein. A protein believed to carry out this function was recently cloned from MA-10 mouse Leydig tumor cells and named the steroidogenic acute regulatory protein (StAR). In the present study, we ev...

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Interferon-γ Inhibits the Steroidogenic Acute Regulatory Protein Messenger Ribonucleic Acid Expression and Protein Levels in Primary Cultures of Rat Leydig Cells.

Interferon-gamma (IFNgamma) is an immunomodulating cytokine that has profound effects on reproductive function. IFNgamma inhibits steroidogenesis both in vivo and in vitro. The mechanism by which IFNgamma inhibits Leydig cell steroidogenesis remains unclear. In the present study, we evaluated the effect of IFNgamma on the expression and regulation of the steroidogenic acute regulatory protein (...

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Tumor Necrosis Factor-α Inhibits Leydig Cell Steroidogenesis through a Decrease in Steroidogenic Acute Regulatory Protein Expression.

The aim of the present study was to identify the sites of the inhibitory action of TNFalpha (tumor necrosis factor alpha) on LH/hCG-stimulated testosterone formation. By using cultured porcine Leydig cells as a model, TNFalpha was shown to inhibit testosterone secretion when testicular cells were stimulated with hCG but not when incubated with 22R-hydroxycholesterol (a cholesterol substrate der...

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Reactive oxygen disrupts mitochondria in MA-10 tumor Leydig cells and inhibits steroidogenic acute regulatory (StAR) protein and steroidogenesis.

Reactive oxygen species (ROS) are involved in a variety of pathophysiological conditions of the testis, and oxidative stress is known to inhibit ovarian and testicular steroidogenesis. The site of ROS-mediated inhibition of steroidogenesis in the corpus luteum and MA-10 tumor Leydig cells was shown to be the hormone-sensitive mitochondrial cholesterol transfer step. The purpose of this study wa...

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Roundup inhibits steroidogenesis by disrupting steroidogenic acute regulatory (StAR) protein expression.

Recent reports demonstrate that many currently used pesticides have the capacity to disrupt reproductive function in animals. Although this reproductive dysfunction is typically characterized by alterations in serum steroid hormone levels, disruptions in spermatogenesis, and loss of fertility, the mechanisms involved in pesticide-induced infertility remain unclear. Because testicular Leydig cel...

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ژورنال

عنوان ژورنال: Journal of Endocrinology

سال: 1998

ISSN: 0022-0795,1479-6805

DOI: 10.1677/joe.0.1560461