0 11 Cooperation Cooperation NNP 12 19 between between IN 20 24 core core NN 25 32 binding binding NN 33 39 factor factor NN 40 43 and and CC 44 52 adjacent adjacent JJ 53 61 promoter promoter NN 62 70 elements element NNS 71 82 contributes contribute VBZ 83 85 to to TO 86 89 the the DT 90 105 tissue-specific tissue-specific JJ 106 116 expression expression NN 117 119 of of IN 120 133 interleukin-3 interleukin-3 NN 133 134 . . . 136 151 Tissue-specific tissue-specific JJ 152 162 expression expression NN 163 165 of of IN 166 179 interleukin-3 interleukin-3 NN 180 181 ( ( ( 181 185 IL-3 il-3 NN 185 186 ) ) ) 187 189 is be VBZ 190 198 mediated mediate VBN 199 202 via via IN 203 213 cis-acting cis-acting JJ 214 222 elements element NNS 223 230 located located JJ 231 237 within within IN 238 241 315 315 CD 242 246 base base NN 247 252 pairs pair NNS 253 255 of of IN 256 259 the the DT 260 273 transcription transcription NN 274 279 start start NN 279 280 . . . 281 285 This this DT 286 288 is be VBZ 289 297 achieved achieve VBN 298 300 in in IN 301 305 part part NN 306 313 through through IN 314 317 the the DT 318 326 positive positive JJ 327 337 activities activity NNS 338 340 of of IN 341 344 the the DT 345 349 AP-1 ap-1 NN 350 353 and and CC 354 359 Elf-1 elf-1 NN 360 365 sites site NNS 366 368 in in IN 369 372 the the DT 373 377 IL-3 il-3 NN 378 386 promoter promoter NN 386 387 . . . 388 391 The the DT 392 404 contribution contribution NN 405 407 to to TO 408 409 T t NN 410 423 cell-specific cell-specific JJ 424 434 expression expression NN 435 437 by by IN 438 443 other other JJ 444 452 promoter promoter NN 453 458 sites site NNS 459 462 was be VBD 463 471 assessed assess VBN 472 474 in in IN 475 476 a a DT 477 486 transient transient JJ 487 497 expression expression NN 498 503 assay assay NN 504 508 with with IN 509 513 IL-3 il-3 NN 514 522 promoter promoter NN 523 533 constructs construct NNS 534 540 linked link VBN 541 543 to to TO 544 545 a a DT 546 556 luciferase luciferase NN 557 561 gene gene NN 561 562 , , , 563 571 focusing focus VBG 572 581 initially initially RB 582 584 on on IN 585 588 the the DT 589 593 core core NN 594 601 binding binding NN 602 608 factor factor NN 609 610 ( ( ( 610 613 CBF CBF NNP 613 614 ) ) ) 615 619 site site NN 619 620 , , , 621 626 which which WDT 627 629 is be VBZ 630 641 footprinted footprinte VBN 642 644 in in FW 645 649 vivo vivo FW 650 654 upon upon IN 655 656 T t NN 657 661 cell cell NN 662 672 activation activation NN 672 673 . . . 674 682 Activity activity NN 683 685 of of IN 686 689 the the DT 690 693 CBF CBF NNP 694 698 site site NN 699 701 is be VBZ 702 707 shown show VBN 708 710 to to TO 711 713 be be VB 714 724 critically critically RB 725 734 dependent dependent JJ 735 737 on on IN 738 741 the the DT 742 750 adjacent adjacent JJ 751 760 activator activator NN 761 765 site site NN 766 771 Act-1 act-1 NN 771 772 . . . 773 781 Together together RB 782 785 the the DT 786 791 Act-1 act-1 NN 792 795 and and CC 796 799 CBF cbf NN 800 805 sites site NNS 806 810 form form VBP 811 812 a a DT 813 823 functional functional JJ 824 828 unit unit NN 829 830 ( ( ( 830 832 AC AC NNP 833 837 unit unit NN 837 838 ) ) ) 839 843 with with IN 844 848 dual dual JJ 849 857 activity activity NN 857 858 . . . 859 862 The the DT 863 865 AC AC NNP 866 870 unit unit NN 871 873 is be VBZ 874 886 demonstrated demonstrate VBN 887 889 to to TO 890 897 enhance enhance VB 898 903 basal basal JJ 904 912 activity activity NN 913 915 of of IN 916 925 promoters promoter NNS 926 930 both both CC 931 933 in in IN 934 945 fibroblasts fibroblast NNS 946 949 and and CC 950 951 T t NN 952 957 cells cell NNS 957 958 . . . 959 963 This this DT 964 972 activity activity NN 973 975 is be VBZ 976 983 further further RBR 984 993 inducible inducible JJ 994 996 in in IN 997 1006 activated activate VBN 1007 1008 T t NN 1009 1014 cells cell NNS 1014 1015 , , , 1016 1019 but but CC 1020 1023 not not RB 1024 1026 in in IN 1027 1038 fibroblasts fibroblast NNS 1038 1039 . . . 1040 1042 In in IN 1043 1051 addition addition NN 1052 1054 to to TO 1055 1058 the the DT 1059 1066 already already RB 1067 1077 identified identify VBN 1078 1081 NIP NIP NNP 1082 1091 repressor repressor NN 1092 1096 site site NN 1096 1097 , , , 1098 1106 evidence evidence NN 1107 1109 is be VBZ 1110 1119 presented present VBN 1120 1123 for for IN 1124 1125 a a DT 1126 1132 second second JJ 1133 1142 repressor repressor NN 1143 1149 region region NN 1150 1154 that that WDT 1155 1164 restricts restrict VBZ 1165 1173 promoter promoter NN 1174 1182 activity activity NN 1183 1185 in in IN 1186 1197 fibroblasts fibroblast NNS 1197 1198 . . . 1199 1206 Finally finally RB 1206 1207 , , , 1208 1209 a a DT 1210 1215 novel novel JJ 1216 1224 positive positive JJ 1225 1235 regulatory regulatory JJ 1236 1243 element element NN 1244 1247 has have VBZ 1248 1252 been be VBN 1253 1259 mapped map VBN 1260 1262 in in IN 1263 1266 the the DT 1267 1271 IL-3 il-3 NN 1272 1280 promoter promoter NN 1281 1288 between between IN 1289 1299 nucleotide nucleotide NN 1300 1304 -180 -180 CD 1305 1308 and and CC 1309 1313 -210 -210 CD 1314 1318 that that WDT 1319 1324 leads lead VBZ 1325 1327 to to TO 1328 1337 increased increase VBN 1338 1348 expression expression NN 1349 1351 in in IN 1352 1353 T t NN 1354 1359 cells cell NNS 1359 1360 . . . 1361 1369 Together together RB 1370 1375 these these DT 1376 1383 results result NNS 1384 1395 demonstrate demonstrate VBP 1396 1400 that that IN 1401 1402 T t NN 1403 1407 cell cell NN 1408 1418 expression expression NN 1419 1421 of of IN 1422 1426 IL-3 IL-3 NNP 1427 1429 is be VBZ 1430 1433 not not RB 1434 1443 specified specify VBN 1444 1446 by by IN 1447 1450 the the DT 1451 1459 activity activity NN 1460 1462 of of IN 1463 1464 a a DT 1465 1471 single single JJ 1472 1487 tissue-specific tissue-specific JJ 1488 1495 element element NN 1495 1496 , , , 1497 1500 but but CC 1501 1508 instead instead RB 1509 1517 involves involve VBZ 1518 1526 multiple multiple JJ 1527 1538 interacting interact VBG 1539 1547 elements element NNS 1548 1552 that that WDT 1553 1560 provide provide VBP 1561 1565 both both CC 1566 1574 specific specific JJ 1575 1583 positive positive JJ 1584 1594 regulation regulation NN 1595 1597 in in IN 1598 1599 T t NN 1600 1605 cells cell NNS 1606 1609 and and CC 1610 1618 specific specific JJ 1619 1627 negative negative JJ 1628 1638 regulation regulation NN 1639 1641 in in IN 1642 1653 fibroblasts fibroblast NNS 1653 1654 . . .