title: Effects of thyroid hormone on carbonic anhydrase I concentration in human erythroid burst-forming unit-derived cells.
abstract: Individuals with hyperthyroidism exhibit red blood cell concentrations of carbonic anhydrase I (CAI) that reflect the integrated serum thyroid hormone concentration over the preceding few months. Furthermore, T3, at a physiological free concentration, decreases the CAI concentration in human erythroleukemic YN-1 cells. The effect of T3 on CAI concentration in burst-forming unit-erythroid (BFU-E)- derived cells, obtained by culturing peripheral blood mononuclear cells with various cytokines, including erythropoietin, has now been investigated. BFU-E-derived cells contained a high concentration of CAI (mean +/- SE, 4.8 +/- 0.8 x 10(-12) mol/10(6) cells; n = 8). The CAI in BFU-E-derived cells was immunologically identical to that present in mature red blood cells. T3 decreased the CAI concentration in BFU-E-derived cells in a dose-dependent manner (28%, 47% and 75% decreases at 3 x 10(-10), 1 x 10(-9), and 3 x 10(-9) mol/liter T3, respectively). These results suggest that BFU-E-derived cells may be used to study the effect of T3 on human red blood cell CAI. This system may prove useful in the tissue diagnosis of resistance to thyroid hormone.
authors.affiliation: Second Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Sayama
authors.forename: K
authors.initials: K
authors.lastname: Yoshida
authors.forename: K
authors.initials: K
authors.lastname: Endo
authors.forename: Y
authors.initials: Y
authors.lastname: Kiso
authors.forename: H
authors.initials: H
authors.lastname: Fukazawa
authors.forename: K
authors.initials: K
authors.lastname: Mori
authors.forename: K
authors.initials: K
authors.lastname: Kikuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Aizawa
authors.forename: H
authors.initials: H
authors.lastname: Hori
authors.forename: K
authors.initials: K
authors.lastname: Abe
mesh_terms: D000328:Adult; D002256:Carbonic Anhydrases / Q000097:blood*; D004305:Dose-Response Relationship, Drug; D015672:Erythroid Precursor Cells / Q000187:drug effects / Q000201:enzymology*; D005260:Female; D006801:Humans; D008297:Male; D013974:Thyroxine / Q000494:pharmacology; D014284:Triiodothyronine / Q000008:administration & dosage / Q000494:pharmacology*; D014285:Triiodothyronine, Reverse / Q000494:pharmacology
chemical_list: D014284:Triiodothyronine; D014285:Triiodothyronine, Reverse; D002256:Carbonic Anhydrases; D013974:Thyroxine