Example sentences for: steroidogenesis

How can you use “steroidogenesis” in a sentence? Here are some example sentences to help you improve your vocabulary:

  • Overall, these data are consistent with previous reports that endocrine cells express voltage-sensitive ion channels that can contribute to the regulation of not only resting membrane potential and cell volume, but also cell proliferation and steroidogenesis [ 12 13 16 18 21 28 29 30 31 32 33 34 35 36 37 ] . The K +currents blocked by 4-AP in pig GC are conducted by ion channels formed by heteromeric complexes of pore-forming subunits from the KCNA (also called Kv1 or Shaker) family of proteins and accessory subunits from the KCNAB (also called Kvβ) family of proteins [ 4 ] . Similar 4-AP-sensitive K +currents play a key role in transduction of mitogenic signals in a variety of cell types, and 4-AP treatment has been associated with not only growth arrest but also apoptosis [ 2 3 8 9 10 14 38 39 40 41 42 ] .

  • Chloride channels or chloride ions are known to influence cAMP-stimulated steroidogenesis by adrenal cells [ 29 ] , human chorionic gonadotropin (hCG)-stimulated steroidogenesis by amphibian follicle-enclosed oocytes [ 56 ] , as well as LH-stimulated steroidogenesis in rat Leydig cells [ 29 ] , MA-10 cells [ 59 ] , and chicken GC [ 35 ] . In mammalian cells, removal of extracellular chloride stimulates basal and protein kinase A (PKA)-dependent steroid hormone production by increasing the expression of StAR and potentiating the effects of submaximal concentrations of cAMP [ 29 59 ] . The proposed mechanism of action involves chloride efflux, depolarization of the mitochondrial and plasma membranes, and alterations to protein synthesis and cholesterol transport [ 29 59 ] .

  • StAR plays a key role in the initial steps of steroidogenesis, because it is required for transport of cholesterol to the inner mitochondrial membrane where CYP11A1 resides and the first reaction in progesterone synthesis occurs [ 45 ] . cAMP is a well known second messenger in FSH- and LH-stimulated progesterone synthesis, and a key effect of the cAMP-dependent protein kinase in GC is transcriptional control of StAR [ 46 47 ] . Estradiol is recognized as a biological amplifier of basal, FSH- and cAMP-stimulated progesterone production in pig GC, with significant synergistic effects distal to the generation of cAMP at one or more steps in cholesterol transport and metabolism [ 48 ] . Our experimental results are thus consistent with 4-AP inhibition of GC progesterone output via drug effects on multiple interacting sites in the steroidogenic pathway.

  • Hormonal signal transduction and steroidogenesis can be affected by changes in intracellular and extracellular concentrations of inorganic ions, cellular resting membrane potential, and cell size [ 29 30 35 54 55 56 57 58 59 ] . Blockade of 4-AP sensitive K +channels in non-nerve, non-muscle cells can lead to changes in transmembrane ion gradients, membrane potential and cell volume [ 42 60 ] . On this basis, we determined the effects of 24 h exposure to 4-AP on GC size, membrane potential and intracellular potassium ([K +] in ).

  • In our experiments, the chloride influx and membrane hyperpolarization associated with 4-AP treatment not only decreased expression of StAR, but also inhibited cAMP production and steroidogenesis.


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