Hormones like erythropoietin are secreted less in ESRD .
Renalase may also be a kidney hormone , although it is also expressed in heart muscle , skeletal muscle and liver cells in humans , and in mouse testicles .
Since hormones like erythropoietin are secreted less in ESRD , renalase may also be a kidney hormone , although it is also expressed in heart muscle , skeletal muscle and liver cells in humans , and in mouse testicles .