Expression of cdc25A and cdc25B proteins in thyroid neoplasms.
Cdc25B and cdc25A phosphates are prominent stimulators of cell cycle progression and recent studies have also suggested their oncogenic roles. To elucidate the role of these proteins in thyroid neoplasms, we immunohistochemically investigated their expression, and neither protein was expressed in normal follicular cells. Cdc25B was frequently overexpressed in follicular adenoma and minimally invasive follicular carcinoma, but the incidence was significantly lower in widely invasive follicular carcinoma. Furthermore, the cdc25B expression level significantly decreased with the dedifferentiation of thyroid carcinoma. Cdc25A overexpression was observed in high incidences in all types of thyroid neoplasms. These results suggest that cdc25B and cdc25A play oncogenic roles in thyroid follicules and that cdc25B works predominantly in the early phase of the progression of thyroid carcinoma, whereas cdc25A plays a fundamental role in the development of thyroid neoplasms.
Ito
Y
Y
Department of Surgery, Kuma Hospital, 8-2-35, Shimoyamate-dori, Chuo-ku, Kobe City 650-0011, Japan. ito01@kuma-h.or.jp
Yoshida
H
H
Nakano
K
K
Kobayashi
K
K
Yokozawa
T
T
Hirai
K
K
Matsuzuka
F
F
Matsuura
N
N
Kakudo
K
K
Kuma
K
K
Miyauchi
A
A
D000236:Adenoma / Q000378:metabolism* / Q000473:pathology; D000368:Aged; D002277:Carcinoma / Q000378:metabolism* / Q000473:pathology; D002291:Carcinoma, Papillary / Q000378:metabolism* / Q000473:pathology; D002453:Cell Cycle / Q000502:physiology; D018797:Cell Cycle Proteins / Q000378:metabolism*; D002454:Cell Differentiation; D018450:Disease Progression; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D011379:Prognosis; D013964:Thyroid Neoplasms / Q000378:metabolism* / Q000473:pathology; D020687:cdc25 Phosphatases / Q000378:metabolism*
D018797:Cell Cycle Proteins; C517004:CDC25A protein, human; C517008:CDC25B protein, human; D020687:cdc25 Phosphatases