DNA-binding activity of the transcription factor upstream stimulatory factor 1 (USF-1) is regulated by cyclin-dependent phosphorylation

Cheung, Edwin; Mayr, Petra; Coda-Zabetta, Federico; Woodman, Phillip G.; Boam, David S.W.

doi:10.1042/0264-6021:3440145

Cited by 16 publications

(15 citation statements)

References 14 publications

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“…The USF family is composed of the products of two ubiquitously expressed genes, USF1 and USF2, which can form homo-and heterodimers [48][49][50][51][52]. In general, the USF proteins activate genes that are involved in cellular differentiation in both developing and adult tissues [45,46,[53][54][55][56]. It was recently reported that USF2 is developmentally regulated in fetal rabbit lung, where it plays a key role in inducing the expression of pulmonary surfactant protein A [57].…”

Section: Discussionmentioning

confidence: 99%

Down-regulation of the polymeric immunoglobulin receptor in non-small cell lung carcinoma: correlation with dysregulated expression of the transcription factors USF and AP2

2005

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The polymeric immunoglobulin receptor (PIGR) mediates transport of IgA and IgM antibodies across mucosal and glandular epithelia. Several studies have utilized immunohistochemistry to demonstrate that PIGR expression varies in different types of lung carcinoma, and is down-regulated during tumor progression. We have previously shown in cultured tumor cell-lines that basal transcription of the PIGR gene is regulated by the transcription factors USF1, USF2 and AP2. To examine the mechanism by which PIGR expression is down-regulated in lung carcinoma, RNA was microdissected from formalin-fixed, paraffin-embedded lung carcinomas (14 adenocarcinomas and 8 squamous cell carcinomas). Levels of PIGR, USF1, USF2 and AP2-alpha mRNA were quantified by real-time reverse transcriptase-polymerase chain reaction and normalized to mRNA for the housekeeping gene GAPDH. PIGR mRNA levels were decreased in adenocarcinomas and squamous cell carcinomas relative to adjacent non-tumor tissue, and were inversely correlated with stage of differentiation. USF1 and USF2 mRNA levels were reduced in adenocarcinomas relative to non-tumor tissue, while AP2-alpha levels were elevated. Multivariate regression analysis demonstrated that reduced USF2 mRNA and increased AP2-alpha mRNA levels were predictive of down-regulated PIGR mRNA expression in the majority of adenocarcinomas and in moderately differentiated squamous cell carcinomas.

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Section: Discussionmentioning

confidence: 99%

Down-regulation of the polymeric immunoglobulin receptor in non-small cell lung carcinoma: correlation with dysregulated expression of the transcription factors USF and AP2

2005

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“…This decrease in binding activity occurred in spite of T4-mediated increases in Usf1 mRNA levels 11 days after birth. It is possible that the small increase in Usf1 mRNA levels observed after T4 stimulation may be negated by other factors that inhibit USF1 DNA-binding activity by a posttranslational mechanism [58][59][60][61]. The exact mechanism of how thyroid hormone contributes to changes in USF activity during the transition from proliferation to differentiation within Sertoli cells remains to be determined.…”

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confidence: 88%

USF1/2 Transcription Factor DNA-Binding Activity Is Induced During Rat Sertoli Cell Differentiation1

Wood

Walker

2009

Biology of Reproduction

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Each Sertoli cell can support a finite number of developing germ cells. During development of the testis, the cessation of Sertoli cell proliferation and the onset of differentiation determine the final number of Sertoli cells and, hence, the number of sperm that can be produced. We hypothesize that the transition from proliferation to differentiation is facilitated by E-box transcription factors that induce the expression of differentiation-promoting genes. The relative activities of E-box proteins were studied in primary Sertoli cells isolated from 5-, 11-, and 20-day-old rats, representing proliferating, differentiating, and differentiated cells, respectively. E-box DNA-binding activity is almost undetectable 5 days after birth but peaks with initiation of differentiation 11 days after birth and remains elevated. Upstream stimulatory factors 1 and 2 (USF1 and USF2) were found to be the predominant E-box proteins present within DNA-protein complexes formed after incubating E-box-containing probes with nuclear extracts from developing Sertoli cells. The known potentiator of Sertoli cell differentiation, thyroxine, increases USF DNA-binding activity in Sertoli cells before differentiation (5-day-old Sertoli cells) but not after differentiation is initiated (11- and 20-day-old Sertoli cells). The developmental-specific increase in USF1 and USF2 DNA-binding activity may facilitate the switch from proliferation to differentiation and, thus, determine the ultimate number of Sertoli cells present within the testes and the upper limit of fertility.

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“…Thus, it was the aim of the present study to investigate whether USF-2 may also have a crucial role for rat HO-1 expression in either an inducible or a repressive manner. Because interspecies differences in the regulation of HO-1 gene expression in human and rat cells (30), as well as cell type-specific differences in the function of USF (11,15,47) were reported, we used rat primary hepatocytes (PHCs), rat hepatoma H4IIE cells, human primary pulmonary artery smooth muscle cells (PASMCs), human hepatoma HepG2 cells, and human HeLa cells in the present study.…”

Section: Introductionmentioning

confidence: 99%

Opposite Expression of the Antioxidant Heme Oxygenase-1 in Primary Cells and Tumor Cells: Regulation by Interaction of USF-2 and Fra-1

Samoylenko

Dimova

Horbach

et al. 2008

Antioxidants & Redox Signaling

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Heme oxygenase-1 is the rate-limiting enzyme for the degradation of the prooxidant heme. Previously, we showed that an E-box within the HO-1 promoter is crucial for the regulation of HO-1 expression in primary hepatocytes. Further to investigate the importance of this E-box, we determined the regulatory capacity of the E-box-binding factor USF-2 in primary cells in comparison with transformed cell lines. We found that HO-1 expression was inhibited by USF-2 in primary cells, whereas it was induced in tumor cell lines. Mutation of either the E-box or the AP-1 site within the HO-1 promoter only partially affected the USF-dependent regulation. However, this regulation was dramatically reduced in tumor cells and completely abolished in primary cells transfected with an HO-1 promoter construct containing mutations in both the E-box and the AP-1 site, suggesting that AP-1 factors and USF-2 may act in a cooperative manner. Indeed, protein-protein interaction studies revealed that USF proteins interacted with Fra-1. Further, the USF-dependent HO-1 promoter activity was not detectable with an USF-2 mutant lacking residues of the USF-specific region (USR) or the transactivation domain encoded by exon 4. Together, these data suggest that USF-2 has opposite regulatory roles for HO-1 gene expression in primary cells and tumor cell lines.

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DNA-binding activity of the transcription factor upstream stimulatory factor 1 (USF-1) is regulated by cyclin-dependent phosphorylation

Cited by 16 publications

References 14 publications

Down-regulation of the polymeric immunoglobulin receptor in non-small cell lung carcinoma: correlation with dysregulated expression of the transcription factors USF and AP2

Down-regulation of the polymeric immunoglobulin receptor in non-small cell lung carcinoma: correlation with dysregulated expression of the transcription factors USF and AP2

USF1/2 Transcription Factor DNA-Binding Activity Is Induced During Rat Sertoli Cell Differentiation1

Opposite Expression of the Antioxidant Heme Oxygenase-1 in Primary Cells and Tumor Cells: Regulation by Interaction of USF-2 and Fra-1

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