Keratinocyte Responsive Element 3: Analysis of a Keratinocyte-specific Regulatory Sequence in the 230-kDa Bullous Pemphigoid Antigen Gene Promoter  Yasushi.

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Keratinocyte Responsive Element 3: Analysis of a Keratinocyte-specific Regulatory Sequence in the 230-kDa Bullous Pemphigoid Antigen Gene Promoter  Yasushi Matsuzaki, Katsuto Tamai, Atsushi Kon, Daisuke Sawamura, Jouni Uitto, Isao Hashimoto  Journal of Investigative Dermatology  Volume 120, Issue 2, Pages 308-312 (February 2003) DOI: 10.1046/j.1523-1747.2003.12044.x Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Effect of KRE3 on the BPAG1 core promoter activity in cultured NHK. The plasmid pBPL was constructed by insertion of the BPAG1 core promoter at the 5′ end of the luciferase gene () in the plasmid pGEM-luc. Plasmids pKBPL, p2KBPL, p3KBPL, and p4KBPL contain one, two, three, or four tandem repeats of KRE3 sequence , respectively, at position –196 upstream from the transcription initiation site of the BPAG1 promoter in the pBPL plasmid. These constructs were transiently transfected to cultured NHK, and the promoter activities of each construct were expressed as luciferase activity . The relative luciferase activity with KRE3 containing constructs was expressed in relation to pBPL which was set at 100. The values are expressed as mean ± SD from three parallel samples in three to four separate experiments, after correction of the activity for the amount of protein in the same cell extracts. The significance of differences, in relation to pBPL construct, is indicated by asterisks (*p<0.01, **p<0.001). Journal of Investigative Dermatology 2003 120, 308-312DOI: (10.1046/j.1523-1747.2003.12044.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Effect of KRE3 orientation on the BPAG1 promoter activity in cultured NHK. The plasmid prKBPL was constructed by insertion of KRE3 reverse sequence (5′-CTATACGGTTTATAAACGTG-3′) at the 5′ end of the BPAG1 core promoter in pBPL, and subjected to transient transfection to cultured NHK together with pBPL and pKBPL; the latter construct contains the KRE3 sequence in sense orientation. Note that prKBPL has very low promoter activity in NHK. The values are expressed as in Figure 1. The significance of differences is indicated by an asterisk (**p<0.001). Journal of Investigative Dermatology 2003 120, 308-312DOI: (10.1046/j.1523-1747.2003.12044.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 The positional effect of KRE3 on the BPAG1 promoter activity in cultured NHK. The plasmid pKins20BPL was constructed by insertion of a random 20 bp sequence between the KRE3 and the core promoter of BPAG1 in pKBPL. The promoter activity in cultured NHK was compared with those noted with pBPL, pKBPL, and p2KBPL, as determined by luciferase assay. About 60% lower promoter activity was obtained by pKins20BPL as compared with the activity of pKBPL. Significance of differences is indicated by an asterisk (*p<0.01). Journal of Investigative Dermatology 2003 120, 308-312DOI: (10.1046/j.1523-1747.2003.12044.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Cell-type specific effect of KRE3 on the BPAG1 core promoter activity in various cell lines. The plasmids pBPL, pKBPL, and p2KBPL were transiently transfected in NHK, NHF, A549, OST, and GT3TKB cell cultures, and the role of KRE3 was evaluated by luciferase assay in each cell type (see Table I). The values are expressed as the relative luciferase activity of pKBPL and p2KBPL, in relation to pBPL (set as 1.0), in NHK, OST, and GT3TKB, in which significant luciferase activities of the BPAG1 promoter plasmid constructs were obtained. No detectable activity was noted in NHF and A549 cells (see Table I). Note that KRE3 dramatically increased the BPAG1 promoter activities in NHK, but not in OST and GT3TKB cultures. Significant difference is indicated by asterisks (**p<0.001). Journal of Investigative Dermatology 2003 120, 308-312DOI: (10.1046/j.1523-1747.2003.12044.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Effect of KRE3 on the TK promoter activity in cultured NHK. The plasmid pTKL has the TK promoter in front of the luciferase gene in the plasmid pGEM-luc. Plasmids pKTKL, p2KTKL, and p3KTKL were constructed by insertion of one, two, or three tandem repeats of KRE3 sequence at position –722 from the transcription initiation site of the TK promoter in the pTKL plasmid. These constructs were transfected to cultured NHK, and the promoter activity was determined by luciferase assay. Note that one or two KRE3 repeat insertions did not significantly affect the TK promoter activity, but p3KTKL, containing three KRE3 repeats, showed strong suppression of TK promoter activity in NHK. Significance of differences is indicated by asterisks (**p<0.001). Journal of Investigative Dermatology 2003 120, 308-312DOI: (10.1046/j.1523-1747.2003.12044.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions