Morphological basics of eye-thyroid association

PURPOSE: Search and identification of thyroid hormone receptors in the structures of the eye by means of immuno- histochemistry analysis (IHC). METHODS: Enucleated eyes of the patients with terminal painful glaucoma (n=30) were the object of morphological research. The search of thyroid hormone receptors was conducted in the retina and optic nerve, ciliary body and its appendixes, trabecular tissue, vessels of choroidea and optic nerve. Antibodies to thyroid hormone receptor THRalfa monoclonal («Diagnostic BioSystem» company, dilution 1:50) and rabbit polyclonal antibodies Anti-Thyroglobulin («Abcam» company, dilution 1:100) were used as primary antibodies (AT). IHC reaction was estimated as follows: - the absence of specific cell color or the presence of less than 10% of stained cells out of all examined area was considered a negative reaction; - a mild positive reaction was considered in case of 10 to 30% staining (+ cells); - moderate positive reaction was in case of the marker expression in 30-75% (++ cells); - marker expression that exceeded 75% was considered a pronounced reaction (+++); - intensive reaction - 100% stained cells (++++). RESULTS: Intensive (4+) positive IHC was discovered in the nuclei of external and internal granular layers of the retina, in the nuclei of the ganglion cells; mild positive staining (1+) was observed in the internal segments of the photoreceptor cells processes. Granule IHC staining (3+) was revealed in the nuclei of the optic nerve glial elements. In the choroidea endotheliocyte nuclei and nuclei of 20% of stroma cells of vascular membrane were stained. There was a marked IHC reaction in the cytoplasm of pigment epithelium cells. Positive staining was observed in the cytoplasm and the nuclei of trabecular endothelial cells, as well as in the nuclei of fibrocytes forming trabecular stroma. Nuclei staining of 80% smooth muscle cells with intensive 3+ and mild cytoplasmic staining 1+ was noted in the ciliary muscle. Pigment and amelanotic epithelium nuclei as well as the nuclei of vessel endothelium cells were stained intensively (3+) in the ciliary body proccesses. CONCLUSION: Conducted investigations help give a morphological base to eye-thyroid association, as well as explain the possible mechanisms of disthyroid optic neuropathy and ocular hypertension, and open-angle glaucoma prevalence in the population of patients with thyroid dysfunction.

иммуногистохимический анализ, рецепторы тиреоидных гормонов, нейрогуморальная связь, immunohistochemistry analysis (IHC), thyroid hormone receptors, neurohumoral link

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