Thyroid hormone receptor alpha 1-beta 1 expression in epididymal epithelium from euthyroid and hypothyroid rats.
The objectives of the present work were to assess whether epithelial cells from the different segments of epididymis express TR alpha 1-beta 1 isoforms, to depict its subcellular immunolocalization and to evaluate changes in their expression in rats experimentally submitted to a hypothyroid state by injection of 131I. In euthyroid and hypothyroid groups, TR protein was expressed in epididymal epithelial cells, mainly in the cytoplasmic compartment while only a few one showed a staining in the nucleus as well. A similar TR immunostaining pattern was detected in the different segments of the epididymis. In hypothyroid rats, the number of TR-immunoreactive epithelial cells as well as the intensity of the cytoplasmic staining significantly increased in all sections analyzed. In consonance to the immunocytochemical analysis, the expression of TR alpha 1-beta 1 isoforms, assessed by Western blot revealed significantly higher levels of TR in cytosol compared to the nuclear fractions. Furthermore, TR expression of both alpha 1 and beta 1 isoforms and their mRNA levels were increased by the hypothyroid state. The immuno-electron-microscopy showed specific reaction for TR in principal cells associated with eucromatin, cytosolic matrix and mitochondria. The differences in expression levels assessed in control and thyroidectomized rats ascertain a specific function of TH on this organ.
De Paul
Ana Lucía
AL
Centro de Microscopía Electrónica, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, Córdoba, Argentina.
Mukdsi
Jorge Humberto
JH
Pellizas
Claudia Gabriela
CG
Montesinos
María
M
Gutiérrez
Silvina
S
Susperreguy
Sebastián
S
Del Río
Alberto
A
Maldonado
Cristina Alicia
CA
Torres
Alicia Inés
AI
D000818:Animals; D015153:Blotting, Western; D002467:Cell Nucleus / Q000378:metabolism; D003593:Cytoplasm / Q000378:metabolism; D004822:Epididymis / Q000378:metabolism* / Q000473:pathology / Q000648:ultrastructure; D004847:Epithelial Cells / Q000378:metabolism* / Q000473:pathology / Q000648:ultrastructure; D015870:Gene Expression; D007037:Hypothyroidism / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology; D007150:Immunohistochemistry; D008297:Male; D016253:Microscopy, Immunoelectron; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D011988:Receptors, Thyroid Hormone / Q000032:analysis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013961:Thyroid Gland / Q000378:metabolism / Q000503:physiopathology; D037021:Thyroid Hormone Receptors alpha / Q000032:analysis / Q000235:genetics*; D037042:Thyroid Hormone Receptors beta / Q000032:analysis / Q000235:genetics*; D013974:Thyroxine / Q000097:blood; D014284:Triiodothyronine / Q000097:blood
D012333:RNA, Messenger; D011988:Receptors, Thyroid Hormone; D037021:Thyroid Hormone Receptors alpha; D037042:Thyroid Hormone Receptors beta; D014284:Triiodothyronine; D013974:Thyroxine