Regulation of thyroid peroxidase activity by thyrotropin, epidermal growth factor and phorbol ester in porcine thyroid follicles cultured in suspension

Journal Article · Sun Jan 01 00:00:00 EST 1989 · Life Sciences; (USA)

DOI:https://doi.org/10.1016/0024-3205(89)90035-0· OSTI ID:5128234

Kasai, Kikuo; Hiraiwa, Masaki; Emoto, Tatsushi; Hattori, Yoshiyuki; Shimoda, Shin-Ichi ^[1]; Ohmori, Takeshi; Koizumi, Narumi; Hosoya, Toichiro ^[2]

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1. Dokkyo Univ. School of Medicine, Tochigi (Japan)
2. Chiba Univ. (Japan)

The activity of thyroid peroxidase (TPO) in porcine follicles cultured for 96 h in suspension with five hormones (5H) still attained over 50% of that in the freshly isolated follicles. On the other hand, the activity in those cultured with 5H + TSH (6H) was several times higher than that cultured with 5H after 96 h, although an initial decrease of TPO activity during the first 24 h of culture was observed in both conditions. The ability of follicles to metabolize iodide when cultured with 6H for 96 h was also several times higher than that of those cultured with 5H. The half-maximal dose of TSH for stimulation of TPO activity and iodide metabolism was 0.03 - 0.04 mU/ml and the effect was mediated by cAMP. These results indicate that in porcine thyroid follicles in primary suspension culture, TPO activity as well as the ability of iodide metabolism is induced by chronic TSH stimulation. In addition, epidermal growth factor and phorbol 12-myristate 13-acetate completely inhibited TSH stimulation on both activities and also basal (5H) activity of iodide metabolism.

• OSTI ID: 5128234
• Journal Information: Life Sciences; (USA), Vol. 45:16; ISSN 0024-3205
• Country of Publication: United States
• Language: English

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