Lori L. Amma

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Type 1 deiodinase (D1) metabolizes different forms of thyroid hormones to control levels of T3, the active ligand for thyroid hormone receptors (TR). The D1 gene is itself T3-inducible and here, the regulation of D1 expression by TRalpha1 and TRbeta, which act as T3-dependent transcription factors, was investigated in receptor-deficient mice. Liver and(More)
Thyroid hormone signaling during a postnatal period in the mouse is essential for cochlear development and the subsequent onset of hearing. To study the control of this temporal dependency, we investigated the role of iodothyronine deiodinases, which in target tissues convert the prohormone thyroxine into triiodothyronine (T3), the active ligand for the(More)
Deletion of thyroid hormone receptor beta (TR beta), a ligand-dependent transcription factor encoded by the Thrb gene, causes deafness and thyroid hyperactivity in Thrb-null (Thrb(tm1/tm1)) mice and in a recessive form of the human syndrome of resistance to thyroid hormone. Here, we have determined that a targeted mutation (Thra(tm2)) in the related Thra(More)
Melatonin was measured in a species of aerobic photosynthetic bacteria, Erythrobacter longus, grown in either constant light or constant dark. A radioimmunoassay was used to quantify melatonin levels and thin-layer chromatography to confirm the identity of melatonin immunoactivity. Melatonin levels were significantly higher (nearly 2.3-fold) in the(More)
Type 1 deiodinase (D1) metabolizes different forms of thyroid hormones to control levels of T3, the active ligand for thyroid hormone receptors (TR). The D1 gene is itself T3-inducible and here, the regulation of D1 expression by TRa1 and TRb, which act as T3-dependent transcription factors, was investigated in receptor-deficient mice. Liver and kidney D1(More)
The precise movement of the cochlear basilar membrane (BM) stimulates the sensory hair cells during auditory transduction. However, the molecular composition of the BM that confers its specialized properties of support and elasticity is poorly understood. A differential screen of cochlear RNA from deaf mice lacking thyroid hormone receptor beta was used to(More)
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