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Similar distribution changes of GABAergic interneuron subpopulations in contrast to the different impact on neurogenesis between developmental and adult-stage hypothyroidism in the hippocampal dentate gyrus in rats

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Abstract

Hypothyroidism affects neurogenesis. The present study was performed to clarify the sensitivity of neurogenesis-related cellular responses in the hippocampal dentate gyrus between developmental and adult-stage hypothyroidism. An exposure study of methimazole (MMI) as an anti-thyroid agent at 0, 50, 200 ppm in the drinking water was performed using pregnant rats from gestation day 10 to postnatal day (PND) 21 (developmental hypothyroidism) and adult male rats by setting an identical exposure period from PND 46 through to PND 77 (adult-stage hypothyroidism). Offspring with developmental hypothyroidism were killed at PND 21 or PND 77, and animals with adult-stage hypothyroidism were killed at PND 77. Proliferation and apoptosis were unchanged in the dentate subgranular zone by either developmental or adult-stage hypothyroidism. With regard to precursor granule cells, a sustained reduction of paired box 6-positive stem or early progenitor cells and a transient reduction of doublecortin-positive late-stage progenitor cells were observed after developmental hypothyroidism with MMI at 50 and 200 ppm. These cells were unchanged by adult-stage hypothyroidism. With regard to γ-aminobutyric acid (GABA) ergic interneuron subpopulations in the dentate hilus, the number of parvalbumin-positive cells was decreased and the number of calretinin-positive cells was increased after both developmental and adult-stage hypothyroidism with MMI at 50 and 200 ppm. Fluctuations in GABAergic interneuron numbers with developmental hypothyroidism continued through to PND 77 with 200 ppm MMI. Considering the roles of GABAergic interneuron subpopulations in neurogenesis and neuronal differentiation, subpopulation changes in GABAergic interneurons by hypothyroidism may be the signature of aberrant neurogenesis even at the adult stage.

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Abbreviations

ADHD:

Attention deficit and hyperactivity disorder

Calb2:

Calretinin

C T :

Threshold cycle

Dcx:

Doublecortin

GABA:

γ-Aminobutyric acid

GD:

Gestational day

Hprt:

Hypoxanthine-guanine phosphoribosyltransferase

MMI:

Methimazole

Pax6:

Paired box 6

PCNA:

Proliferating cell nuclear antigen

PND:

Postnatal day

Pvalb:

Parvalbumin

PTU:

6-propyl-2-thiouracil

SD:

Sprague–Dawley

SGZ:

Subgranular zone

T3 :

Triiodothyronine

T4 :

Thyroxine

TH:

Thyroid hormone

TSH:

Thyroid-stimulating hormone

TUNEL:

Terminal deoxynucleotidyl transferase dUTP nick end labeling

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Acknowledgments

The authors thank Mrs. Shigeko Suzuki for her technical assistance in preparing the histological specimens. This work was supported by a grant from Ministry of Economy, Trade and Industry (METI), Japan.

Conflict of interest

All authors disclose that there are no conflicts of interest that could inappropriately influence the outcome of the present study.

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Correspondence to Makoto Shibutani.

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Shiraki, A., Akane, H., Ohishi, T. et al. Similar distribution changes of GABAergic interneuron subpopulations in contrast to the different impact on neurogenesis between developmental and adult-stage hypothyroidism in the hippocampal dentate gyrus in rats. Arch Toxicol 86, 1559–1569 (2012). https://doi.org/10.1007/s00204-012-0846-y

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