Y-box binding protein expression in thyroid neoplasms: its linkage with anaplastic transformation.
Recent studies have demonstrated that Y-box binding protein (YB-1) regulates the transcription of genes linked to carcinoma progression. In this study, we investigated the expression of this protein in thyroid neoplasms to elucidate its significance. The expression of YB-1 was immunohistochemically investigated using the monoclonal antibody for various thyroid neoplasms. Normal follicles did not overexpress YB-1, and only moderate overexpression of YB-1 was observed in some follicular tumors and papillary carcinoma, especially those of a larger size. In contrast, 92.9% of anaplastic carcinoma strongly overexpressed YB-1. YB-1 immunoreactivity was seen in both cytoplasms and cell nuclei, but the former was more predominant. These findings suggest that YB-1 plays a role in regulating the transcription as well as translation of genes contributing to the anaplastic transformation of thyroid carcinoma.
Ito
Yasuhiro
Y
Department of Surgery, Kuma Hospital, Kobe, Japan. ito01@kuma-h.or.jp
Yoshida
Hiroshi
H
Shibahara
Kotaro
K
Uruno
Takashi
T
Nakano
Keiichi
K
Takamura
Yuuki
Y
Miya
Akihiro
A
Kobayashi
Kaoru
K
Yokozawa
Tamotsu
T
Matsuzuka
Fumio
F
Uchimi
Takeshi
T
Kuwano
Michihiko
M
Miyoshi
Eiji
E
Matsuura
Nariaki
N
Kuma
Kanji
K
Miyauchi
Akira
A
D018263:Adenocarcinoma, Follicular / Q000378:metabolism / Q000473:pathology; D000231:Adenocarcinoma, Papillary / Q000378:metabolism / Q000473:pathology; D022762:CCAAT-Enhancer-Binding Proteins / Q000378:metabolism*; D002277:Carcinoma / Q000378:metabolism* / Q000473:pathology; D002471:Cell Transformation, Neoplastic / Q000378:metabolism* / Q000473:pathology; D004268:DNA-Binding Proteins; D006801:Humans; D007124:Immunoenzyme Techniques; D019394:Ki-67 Antigen / Q000378:metabolism; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D013961:Thyroid Gland / Q000378:metabolism; D013964:Thyroid Neoplasms / Q000378:metabolism* / Q000473:pathology; D014157:Transcription Factors / Q000378:metabolism*; D051840:Y-Box-Binding Protein 1
D022762:CCAAT-Enhancer-Binding Proteins; D004268:DNA-Binding Proteins; D019394:Ki-67 Antigen; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D014157:Transcription Factors; D051840:Y-Box-Binding Protein 1; C070856:YBX1 protein, human