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. 1991 May 1;88(9):3887–3891. doi: 10.1073/pnas.88.9.3887

Immunofluorescence localization of thyroid hormone receptor protein beta 1 and variant alpha 2 in selected tissues: cerebellar Purkinje cells as a model for beta 1 receptor-mediated developmental effects of thyroid hormone in brain.

K A Strait 1, H L Schwartz 1, V S Seybold 1, N C Ling 1, J H Oppenheimer 1
PMCID: PMC51558  PMID: 1850839

Abstract

Rat c-erbA beta 1 mRNA rises in cerebrum during the first 10 days of life, coincident with an increase in tissue triiodothyronine (T3) levels and T3-dependent brain development. These data suggest that the beta 1 receptor may mediate the T3 effect. However, in cerebellum c-erbA beta 1 mRNA levels were very low. Since cerebellar development, including dendritic arborization of Purkinje cells, is a T3-sensitive process, we assessed the levels of the beta 1 receptor protein in cerebellum during development. Antisera to unique peptide regions of beta 1 were raised. Their specificity was demonstrated by specific immunoprecipitation of the in vitro translated product, 85% immunoprecipitation of the T3 binding activity in hepatic nuclear extracts, and Western blot analysis of tissue extracts. Immunohistochemical studies using anti-beta 1 antiserum stained liver nuclei but not testis nuclei, which contain no T3 binding activity or beta 1 mRNA. In cerebellar Purkinje cells, an immunofluorescent signal, localized to the nucleus and more intense than that seen in the liver, was observed. A positive but weaker signal was also present in the granule cells. Thus, we may infer that the cerebellum contains significant concentrations of beta 1 receptor protein despite the low beta 1 mRNA content. Both the intensity of staining in Purkinje cell nuclei and immunoprecipitable beta 1 receptor binding capacity rose in the neonatal period. Antiserum to the non-T3 binding alpha 2 variant protein was also prepared and a distinctive pattern of fluorescence was observed. Strong fluorescence was seen in the nuclei of granule cells, but none was seen in Purkinje cells. The alpha 2 fluorescence in testis was high, consistent with the high levels of alpha 2 mRNA in this tissue. The fluorescent signal appeared to originate primarily in dividing spermatogonia. Our findings support the concept that the beta 1 receptor plays a central role in T3-induced brain development and strongly suggest that the Purkinje cell is a direct target for T3.

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Selected References

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