The Disturbance of Thyroid-associated Hormone and Its Receptors in Brain and Blood Circulation Existed in the Early Stage of Mouse Model of Alzheimer's Disease

Overview

Journal Aging (Albany NY)

Specialty Geriatrics

Date 2023 Mar 10

PMID 36897166

Authors

Bingxiu Ren

Jinxin Ma

Min Tao

Gongwei Jing

Sheng Han

Chengyi Zhou

Xin Wang

Jiaoya Wang

Affiliations

Soon will be listed here.

Abstract

Background: Studies showed that thyroid function plays an important role in the pathology of Alzheimer's disease (AD). However, changes in brain thyroid hormone and related receptors in the early stage of AD were rarely reported. The aim of this study was to explore the relationship between the early stage of AD and local thyroid hormone and its receptors in the brain.

Methods: The animal model was established by stereotactic injection of okadaic acid (OA) into hippocampal region for the experiment, and 0.9% NS for the control. Blood sample from each mouse was collected and then the mice were sacrificed and the brain tissue was collected for detecting free triiodothyronine (FT3), free thyroid hormone (FT4), and thyroid-stimulating hormone (TSH), thyrotropin-releasing hormone (TRH) and phosphorylated tau, amyloid-β (Aβ) and thyroid hormone receptors (THRs) in the hippocampus of the mice were detected as well.

Results: Enzyme-linked immunosorbent assay showed that compared with the control, FT3, FT4, TSH and TRH in brain were significantly increased in the experimental group; in the serum, FT4, TSH and TRH were increased, while FT3 had no change; western blot analysis indicated that the expression of THR α and β in the hippocampus of the experimental group was significantly higher than that of the control.

Conclusion: Based on the results of this study, a mouse AD model can be established successfully by injecting a small dose of OA into the hippocampus. We speculate that early AD brain and circulating thyroid dysfunction may be an early local and systemic stress repair response.

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