[Physiological basis of goiter transformation of the thyroid gland and the pathogenesis of euthyroid goiter].

Endemic goiter disease develops as a result of iodine insufficiency in the environment, that induces advancing reproduction of thyrocytes realized by endomitosis. Eventually goiter-transformed gland ceases responding to the lack of iodine in the environment, that is due to the destruction of thyrocyte ++thyroreceptors. It should be taken into account that goiter disease depends upon the female sexual hormones.

[Characteristics of thyrocyte multiplication in proliferating thyroid epithelium].

Although the thyroid parenchyma is characterized by high proliferative ability, mitoses in it are seldom observed. Earlier it was considered that the main type of thyrocyte reproduction was amitotic division. However, biochemical investigations of late showed that the thyroid parenchyma during rapid growth in tissue culture intensively incorporated thymidine, this being an evidence of DNA replication indicating mitoses.

[Correlations between the functional activity and proliferation of the thyroid parenchyma. The proliferative forms of the parenchyma of the thyroid].

Multiple thyroid adenomas formed by straight or coiled epithelial cords developed in experiments on adult male rats as a result of prolonged intermittent 6-MTU administration. Such epithelial cords could be sometimes observed in thyroid parenchyma regeneration after partial thyroidectomy. These cords originated from thyrocytes of the follicle epithelium.