Dietary Thyroid Hormone Replacement Ameliorates Hearing Deficits in Hypothyroid Mice

Overview

Journal Mamm Genome

Specialty Genetics

Date 2007 Sep 28

PMID 17899304

Citations 29

Authors

I Jill Karolyi

Gary A Dootz

Karin Halsey

Lisa Beyer

Frank J Probst

Kenneth R Johnson

Albert F Parlow

Yehoash Raphael

David F Dolan

Sally A Camper

Affiliations

Soon will be listed here.

Abstract

Thyroid hormone (TH) insufficiency causes variable hearing impairment and mental deficiency in humans. Rodents lacking TH have congenital hearing deficiency that has been attributed to physiologic, morphologic, and developmental abnormalities of the auditory system. We examined four genetically defined strains of hypothyroid mice for development of hearing and response to TH replacement initiated during late gestation and continued through six weeks of age. Auditory brain stem response studies showed variable hearing impairment in homozygous mutants of each strain at three weeks of age relative to normal littermates. Mutants from three of the strains still had hearing deficiencies at six weeks of age. TH-enriched diet significantly improved hearing in three-week-old mutants of each strain relative to untreated mutants. Differences in the level of hearing impairment between the Prop1df and Pit1dw mutants, which have defects in the same developmental pathway, were determined to be due to genetic background modifier genes. Further physiologic and morphologic studies in the Cgatm1Sac strain indicated that poor hearing was due to cochlear defects. We conclude that TH supplement administered during the critical period of hearing development in mice can prevent deafness associated with congenital hypothyroidism of heterogeneous genetic etiology.

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