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Direct progression of capsular invasive carcinomas from subcapsular focal hyperplasias induced by hypothyroidism-mediated tumor promotion in a rat two-stage thyroid carcinogenesis model. | LitMetric

AI Article Synopsis

Article Abstract

Purpose: Some goitrogens promote thyroid carcinogenesis in rats in an initiation-promotion model; this model frequently produces carcinomas that invade fibrously thickened capsules, termed capsular invasive carcinomas (CICs). The present study tested a hypothesis that CICs originate from parenchymal proliferative lesions located beneath the capsule.

Methods: Cell proliferation activity, cell-cycle kinetics and cellular invasion were immunohistochemically examined in subcapsular proliferative lesions in male F344 rats treated with an anti-thyroid agent, propylthiouracil or sulfadimethoxine, during the tumor-promotion phase after initiation with N-bis(2-hydroxypropyl)nitrosamine.

Results: Focal follicular cell hyperplasias (FFCHs) were the most commonly observed parenchymal proliferative lesions. Subcapsular FFCHs located near CICs showed more Ki-67(+) cells in the capsular side than the contrary parenchymal center side. Most of these FFCHs located near CICs showed accumulated immunoreactivity for cyclin A, cyclin D, cyclin E and cyclin-dependent kinase-2, whereas most subcapsular FFCHs located elsewhere did not show such accumulated expression of cell-cycle molecules. Subcapsular FFCHs immunoreactive at the capsular front for tenascin-C, a tumor invasion marker of extracellular matrix protein, showed high proliferation activity.

Conclusions: Subcapsular FFCH-forming cells can potentially spread directly into the fibrously thickened capsule to form CICs by accelerating cell-cycle activity.

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Source
http://dx.doi.org/10.1007/s00432-012-1338-4DOI Listing

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