Regulation of Thyroid Hormone Availability by Iodothyronine Deiodinases at the Blood-Brain Barrier in Birds
Abstract: It is accepted that type II iodothyronine deiodinase (D2) is predominantly found in brain, where it maintains homeostasis of thyroid hormone (TH) levels. The current study describes the production of a polyclonal D2 antiserum and its use in the comparison of D2 protein distribution with that of type I (D1) and type III (D3) deiodinase protein in the chicken choroid plexus (CP). Immunocytochemistry showed high D2 protein expression in the epithelial cells of the CP, whereas the D1 and D3 proteins were absent. Furthermore, dexamethasone treatment led to an upregulation of the D2 protein in these cells.
blood-brain barrier brain type ii iodothyronine deiodinase (d2) thyroid hormone (th) protein choroid plexus (cp)