logo

Animation: Steroid Hormone Pathway

by Pearson
2 views
Was this helpful ?
0
>> Steroid hormone action. A steroid hormone, such as testosterone or an estrogen, acts by entering a target cell and turning genes on or off. Steroids usually act rather slowly because it takes time for gene products to build up or become depleted. This steroid hormone passes through the plasma membrane and binds to a receptor protein in the cytoplasm. The hormone receptor complex enters the nucleus and attaches to specific regulatory sites on the target cell's DNA. There it acts as a transcription factor, a gene activator. A messenger RNA molecule is transcribed, which is then translated into a protein, for example, an enzyme. This new protein alters the function of the target cell.
>> Steroid hormone action. A steroid hormone, such as testosterone or an estrogen, acts by entering a target cell and turning genes on or off. Steroids usually act rather slowly because it takes time for gene products to build up or become depleted. This steroid hormone passes through the plasma membrane and binds to a receptor protein in the cytoplasm. The hormone receptor complex enters the nucleus and attaches to specific regulatory sites on the target cell's DNA. There it acts as a transcription factor, a gene activator. A messenger RNA molecule is transcribed, which is then translated into a protein, for example, an enzyme. This new protein alters the function of the target cell.