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• W2048162502 endingPage "G500" @default.
• W2048162502 startingPage "G491" @default.
• W2048162502 abstract "Na + /H + exchanger (NHE) isoforms NHE2 and NHE3, colocalized to the brush border membrane of the epithelial cells, exhibit differences in their pattern of tissue expression and regulation by various molecular signals. To investigate the mechanisms involved in regulation of NHE3 gene expression, the human NHE3 promoter region was cloned and characterized. Primer extension experiments located the transcription start site to a position 116 nucleotides upstream from the translation start codon. The 5′-flanking region lacked a CCAAT box but contained a TATA-like sequence. Nucleotide sequencing of the 5′-flanking region revealed the presence of a number of cis elements including Sp1, AP-2, MZF-1, CdxA, Cdx-2, steroid and nonsteroid hormone receptor half sites, and a phorbol 12-myristate 13-acetate-response element. Transient transfection experiments using C2/bbe cell line defined a maximal promoter activity in −95/+5 region. The regulatory response elements clustered within this region include a potential transcription factor IID (TF IID), a CACCC, two Sp1, and two AP-2 motifs. Deletion of a fragment containing the AP-2 and Sp1 motifs resulted in a drastic decrease in promoter activity. In gel mobility shift assays, an oligonucleotide spanning from −78 to −56 bp bound a recombinant AP-2, and the corresponding binding activity in nuclear extracts was supershifted with anti-AP2α antibody. Our studies suggest that the NHE3 expression is regulated by a combination of ciselements and their cognate transcription factors that include the AP-2 and Sp1 family members." @default.
• W2048162502 created "2016-06-24" @default.
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• W2048162502 date "2002-03-01" @default.
• W2048162502 modified "2023-10-11" @default.
• W2048162502 title "Molecular cloning and functional analysis of the human Na⁺/H⁺exchanger NHE3 promoter" @default.
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• W2048162502 doi "https://doi.org/10.1152/ajpgi.00273.2001" @default.
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