Subject: Stimulus for the release of erythropoietin

Is there any connection between the brain and the production
of erythropoietin?  I understand that as the number of red
blood cells falls,the decrease in oxygen causes the kidney
cells to secrete this hormone, but I wonder if there is any 
influence from hormones secreted in the brain on the pro-
duction of erythropoietin. Any information on exactly what
causes erythropoietin to be released would be helpful.  
Thank-you.

Re: Stimulus for the release of erythropoietin