Steroid

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=== Steroids and intracellular receptors  ===
 
 
[[Image:Nuclear Receptors.jpg|frame|643x367px|Nuclear Receptors.jpg]]
 
 
 
[[Steroids|Steroid hormones]] are lipids and so can enter the cell by simple [[Diffusion|diffusion]] across the [[Phospholipid bilayer|plasma membrane]]. The receptors for this hormone exist either in the cytoplasm or nucleus, which is where the hormone binds to them. When the hormone binds to the receptor, a  series of events occurs:  
 
[[Steroids|Steroid hormones]] are lipids and so can enter the cell by simple [[Diffusion|diffusion]] across the [[Phospholipid bilayer|plasma membrane]]. The receptors for this hormone exist either in the cytoplasm or nucleus, which is where the hormone binds to them. When the hormone binds to the receptor, a  series of events occurs:  
 
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*The receptor is activated due to a&nbsp;conformational changes in the [[Neurotransmitter|receptor]] induced by the binding hormone. This activation&nbsp;leads to the receptor being able to&nbsp;bind to&nbsp;[[DNA|DNA]].  
 
*The receptor is activated due to a&nbsp;conformational changes in the [[Neurotransmitter|receptor]] induced by the binding hormone. This activation&nbsp;leads to the receptor being able to&nbsp;bind to&nbsp;[[DNA|DNA]].  
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Latest revision as of 17:02, 2 December 2015

Steroid hormones are lipids and so can enter the cell by simple diffusion across the plasma membrane. The receptors for this hormone exist either in the cytoplasm or nucleus, which is where the hormone binds to them. When the hormone binds to the receptor, a  series of events occurs:

The hormone-receptor complex at the ligand binding domain thus behaves as a transcription factor. Due to steroid hormone's ability to diffuse freely through the lipid bilayer due to being hydrophobic they can have a long lasting effect on a target cell and their signal and remain active from hours - days [1].

References

  1. 1998, Hormones with Intracellular Receptors, http://www.vivo.colostate.edu/hbooks/pathphys/endocrine/moaction/intracell.html, 22.11.12
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