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star protein
While appending the inhibitor of Protein Kinase A (PKA) to Leydig cells in culture, the expression level of StAR protein, mRNA and the activity of ERK1/2 began to drop significantly, but the level of StAR mRNA could still be detectable.
      
While appending the inhibitor of MAPK (PD98059), the expression level of StAR protein and mRNA declined significantly.
      
These results infer that at the beginning of hCG stimulation, hCG increases the level of StAR protein by cAMP-PKA.
      
With prolonged stimulating time, hCG increases the level of StAR protein through cAMP-PKA-ERK1/2.
      
Hormonal regulation of steroidogenic acute regulatory (StAR) protein messenger ribonucleic acid expression in the rat ovary
      
Prostaglandin F2α reduces steroidogenic acute regulatory (StAR) protein messenger ribonucleic acid expression in the rat ovary
      
Steroidogenic acute regulatory (StAR) protein is thought to mediate the rapid increase in steroid hormone biosynthesis in response to tropic hormones by facilitating cholesterol transport to the inner mitochondrial membrane.
      
The steroidogenic acute regulatory (StAR) protein two years later
      
To evaluate whether increased StAR mRNA levels induced by IGF-I and hCG are associated with increased StAR protein levels, we carried out Western blot analyses.
      
Basal StAR protein levels were low after 24 h in culture.
      
hCG (10 ng/mL) increased StAR protein by 4.5-fold.
      
In the presence of IGF-I (100 ng/mL), hCG-induced StAR protein levels were further increased.
      
Steroidogenic acute regulatory (StAR) protein mediates the rapid increase in steroid hormone biosynthesis in response to tropic hormones by facilitating transport of cholesterol into the inner mitochondrial membrane.
      
Incubation of the cells with quinacrine resulted in dose-dependent decreases in steroid production and StAR protein.
      
Twenty micromolars quinacrine inhibited 92 and 91% of LH-induced progesterone and StAR protein, respectively, and 98 and 90% of Bt2cAMP-induced progesterone and StAR protein.
      
Reversal of this inhibition was obtained by incubation of quinacrine-treated cells with various levels of AA, which resulted in a dose-dependent increase in both steroid and StAR protein levels.
      
Two hundred micromolars of AA rescued 57 and 60% of the LH-induced steroid production and StAR protein, respectively, and 52 and 89% of Bt2cAMP-induced steroid production and StAR protein.
      
These results suggest that the effect of AA on LH- and cAMP-stimulated steroidogenesis is associated with the modulation of StAR protein expression.
      
Repression of the rat steroidogenic acute regulatory (StAR) protein gene by PGF2α is modulated by the negative transcription fac
      
Dexamethasone increased DAX-1 expression and concordantly decreased StAR protein and mRNA in testicular cells.
      
 

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