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The relationship between subclinical hypothyroidism (SH) and Atherosclerotic (At) cardiovascular diseases (CVD) has been one of the most popular topics but causal connection between Hashimoto thyroiditis (HT), lipid profile and follicular epithelial molecular biology is controversial. We investigated 3 groups of patients (group I - HT, group II - HT+At, group III - At). All laboratory tests for thyroid function and lipid profile detection were used according to international guideline recommendations, coronary and femoral arteries intima-media thickness (IMT) were tested by high-resolution ultrasonography, thyroid gland histology and immunohistochemistry carried out by p63 and S100 protein expression control. The statistical analysis was performed using Microsoft Excel 7.0, SPSS-20 version, Mann-Whitney U-test and Pearson's correlation. Comparisons between groups and factors were made using Multiple Linear Regression model. With the results obtained, dyslipidemia and the diastolic hypertension accelerate the hypothyroidism in HT+At group to predispose carotid and femoral arteries IMT. TSH and anti-TPO antibody levels are directly linked to the cardiovascular complications. Biomarkers S100 and p63 data show negative feedback effects of hypercholesterolemia on the high morphological risk features in Hashimoto parenchyma, which may partially explain the significant trend and pathobiological link of HT with Papillary thyroid carcinoma.

Investigated 62 sample of thyroid gland obtained after surgical intervention, including: HT (n=27), RT (n=9), Graves' disease (n=17) and papillary thyroid carcinoma (n = 10). The slides were studied using classical histological and immunohistochemical methods: H&E, TTF1, TSH, S100-protein, CD56 and p63. Dispite of the histological and immunohistochemical heterogeneity of Thyroiditis HT and RT, the progressive involution of the glandular tissue with the replacement by the sever fibrosis, in some cases by the scar tissue is observed as damage sign. In Hashimoto thyroiditis, the foci of follicular epithelium dysplasia were determined, with p63 positive and CD56 negative reactions. Graves' disease is characterized by high TSH expression as well as lymphoproliferation with the formation of large fused nodules with germinative centers. With Riedel's thyroiditis, there is a moderate expression of TTF-1 in the stroma and capillary endotheliocytes, as well as diffuse-focal moderate expression of S100 protein in cells of neuroectodermal population. The reaction to malignant transformation markers - CD56 and p63 - in the tissue of Thyroid gland with Thyroiditis, Riedel was definitely negative.

The present study was designed to evaluate the participation and utility of Hǘrtle cells morphological requirment and transformation under Hashimoto autoimmune thyroiditis versus Riedel´s struma. Several markers have been evaluated to detect induced activities of Hǘrtle cells. Study subject - specimens (tissue fragments) collected from TG surgery (thyroidectomy) for mollecular (receptor) diagnosis of Hǘrtle cells activities using routine histological and immunohistochemical samples. 89 cases were selected in Hashimoto thyroiditis diagnosis with Hǘrtle cells history (adenoma and adenomatous grouth of oncocytes). Markers as: TSH receptors, TTF-1, S-100 protein, also anti-TPO and anti-TG levels in blood plasm were detected. It was shown that solid cell claster-nests like agregation of oncocytes and adenomatous growth foci in parafollicular areas with anti-TPO and anti-TG antibodies levels arising while Riedel´s struma shown only large intra- and extra glandular inflammatory proliferative fibrosing process. Large positive expression of TTF-1 and S-100 protein and the negative reaction of TSH receptor factor suggest that Thyroid parenchyma disorganization and mollecular biological atypia with Hǘrtle cells are proceses due to hypothyreoidismus, as well as neuroectodermal cells prominent activities in 70% of Hashimoto cases.