Thyroid hormone receptor gene expression in first trimester human fetal brain.
J Clin Endocrinol Metab
; 85(7): 2620-3, 2000 Jul.
Article
en En
| MEDLINE
| ID: mdl-10902817
Maternal thyroid hormone is transferred to the fetus early in pregnancy and is postulated to regulate brain development. Thyroid hormone nuclear receptor (TR) proteins are present in fetal brain, but their isoformal composition is unknown. We therefore investigated the ontogeny of TR isoforms and related splice variants in first trimester human fetal brain (n = 9) by semi-quantitative reverse transcriptase-polymerase chain reaction analysis. Expression of the TRbeta1, TRalpha1 and c-erbAalpha2 isoforms was detected from 8.1 weeks gestation (wg). An additional truncated species was detected with the c-erbAalpha2 primer set, consistent with the c-erbAalpha3 splice variant previously described in the rat. All c-erbAalpha-derived transcripts were co-ordinately expressed and increased (ca. 8-fold) between 8.1 and 13.9 wg. A more complex ontogenic pattern was observed for TRbeta1, suggestive of a nadir between 8.4 and 12.0 wg. These findings point to an important role for the TRalpha1 isoform in mediating maternal thyroid hormone action during first trimester human fetal brain development.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Receptores de Hormona Tiroidea
/
Química Encefálica
/
Regulación del Desarrollo de la Expresión Génica
Límite:
Adult
/
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
J Clin Endocrinol Metab
Año:
2000
Tipo del documento:
Article
País de afiliación:
Reino Unido
Pais de publicación:
Estados Unidos