The absence of serum steroids was demonstrated to restrict proliferation of cultured TT cells (cell line originating from human thyroid medullary carcinoma) and supplementation with calcitriol was found to partially restore the proliferation. Calcitriol stimulated TT cell proliferation by augmenting expression of proliferation-associated proteins and by restricting apoptosis. Moreover, calcitriol decreased the intensity of transcription but failed to change direction of the altemate splicing of the calcitonin gene.
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