Gene expression of the human plasma membrane-associated sialidase (NEU3), a key enzyme for ganglioside degradation, is relatively high in brain and is modulated in response to many cellular processes, including neuronal cell differentiation and tumorigenesis. We demonstrated previously that NEU3 is markedly up-regulated in various human cancers and showed that NEU3 transgenic mice developed a diabetic phenotype and were susceptible to azoxymethane-induced aberrant crypt foci in their colon tissues. These results suggest that appropriate control of NEU3 gene expression is required for homoeostasis of cellular functions. To gain insights into regulation mechanisms, we determined the gene structure and assessed transcription factor involvement. Oligo-capping analysis indicated the existence of alternative promoters for the NEU3 gene. Transcription started from two clusters of multiple TSSs (transcription start sites); one cluster is preferentially utilized in brain and another in other tissues and cells. Luciferase reporter assays showed further that the region neighbouring the two clusters has promoter activity in the human cell lines analysed. The promoter lacks TATA, but contains CCAAT and CAAC, elements, whose deletions led to a decrease in promoter activity. Electrophoretic mobility-shift assays and chromatin immunoprecipitation demonstrated binding of transcription factors Sp (specificity protein) 1 and Sp3 to the promoter region. Down-regulation of the factors by siRNAs (short interfering RNAs) increased transcription from brain-type TSSs and decreased transcription from other TSSs, suggesting a role for Sp1 and Sp3 in selection of the TSSs. These results indicate that NEU3 expression is diversely regulated by Sp1/Sp3 transcription factors binding to alternative promoters, which might account for multiple modulation of gene expression.
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Research Article|
July 28 2010
Regulation of plasma-membrane-associated sialidase NEU3 gene by Sp1/Sp3 transcription factors
Kazunori Yamaguchi
;
Kazunori Yamaguchi
*Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
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Koichi Koseki
;
Koichi Koseki
*Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
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Momo Shiozaki
;
Momo Shiozaki
*Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
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Yukiko Shimada
;
Yukiko Shimada
*Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
†Friedrich Miescher Institute, CH-4058, Basel, Switzerland
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Tadashi Wada
;
Tadashi Wada
*Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
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Taeko Miyagi
Taeko Miyagi
1
*Division of Biochemistry, Miyagi Cancer Center Research Institute, Natori, Miyagi, 981-1293, Japan
1To whom correspondence should be addressed, at the present address: Division of Cancer Glycosylation Research, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University, 4-4-1 Komatsushima, Aoba-ku, Sendai, 981-8558, Japan (email tmiyagi@tohoku-pharm.ac.jp).
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Biochem J (2010) 430 (1): 107–117.
Article history
Received:
March 10 2010
Revision Received:
May 26 2010
Accepted:
June 02 2010
Accepted Manuscript online:
June 02 2010
Citation
Kazunori Yamaguchi, Koichi Koseki, Momo Shiozaki, Yukiko Shimada, Tadashi Wada, Taeko Miyagi; Regulation of plasma-membrane-associated sialidase NEU3 gene by Sp1/Sp3 transcription factors. Biochem J 15 August 2010; 430 (1): 107–117. doi: https://doi.org/10.1042/BJ20100350
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