0 11 Multifactor Multifactor NNP 12 24 cis-dominant cis-dominant JJ 25 33 negative negative JJ 34 44 regulation regulation NN 45 47 of of IN 48 52 IL-2 il-2 NN 53 57 gene gene NN 58 68 expression expression NN 69 71 in in IN 72 81 anergized anergize VBN 82 83 T t NN 84 89 cells cell NNS 89 90 . . . 92 95 The the DT 96 105 molecular molecular JJ 106 115 mechanism mechanism NN 116 126 underlying underlie VBG 127 131 IL-2 il-2 NN 132 147 transcriptional transcriptional JJ 148 156 blockade blockade NN 157 159 in in IN 160 167 anergic anergic JJ 168 169 T t NN 170 174 cell cell NN 175 181 clones clone NNS 182 184 is be VBZ 185 188 not not RB 189 194 fully fully RB 195 205 understood understand VBN 205 206 . . . 207 209 To to TO 210 217 examine examine VB 218 225 whether whether IN 226 228 an an DT 229 235 active active JJ 236 244 negative negative JJ 245 255 regulatory regulatory JJ 256 263 process process NN 264 270 occurs occur VBZ 270 271 , , , 272 274 we we PRP 275 282 created create VBD 283 284 a a DT 285 293 reporter reporter NN 294 303 construct construct NN 304 314 containing contain VBG 315 317 as as IN 318 320 an an DT 321 329 enhancer enhancer NN 330 334 four four CD 335 341 copies copy NNS 342 344 of of IN 345 348 the the DT 349 354 NF-AT NF-AT NNP 355 359 site site NN 360 363 and and CC 364 367 one one CD 368 372 copy copy NN 373 375 of of IN 376 379 the the DT 380 387 octamer octamer NN 388 392 site site NN 393 394 ( ( ( 394 396 4X 4x NN 397 406 NF-AT-Oct NF-AT-Oct NNP 406 407 ) ) ) 407 408 . . . 409 413 This this DT 414 423 construct construct NN 424 427 was be VBD 428 432 only only RB 433 441 slightly slightly RB 442 449 reduced reduce VBN 450 451 ( ( ( 451 459 1.3-fold 1.3-fold RB 459 460 ) ) ) 461 463 in in IN 464 467 its its PRP$ 468 478 expression expression NN 479 483 when when WRB 484 494 stimulated stimulate VBN 495 500 under under IN 501 508 anergic anergic JJ 509 519 conditions condition NNS 519 520 , , , 521 526 while while IN 527 528 a a DT 529 534 whole whole JJ 535 540 mouse mouse NN 541 545 IL-2 il-2 NN 546 554 enhancer enhancer NN 555 564 construct construct NN 565 571 showed show VBD 572 573 a a DT 574 583 reduction reduction NN 584 586 of of IN 587 595 4.3-fold 4.3-fold RB 595 596 . . . 597 605 Addition addition NN 606 608 of of IN 609 612 the the DT 613 617 -176 -176 CD 618 620 to to TO 621 624 -96 -96 CD 625 633 sequence sequence NN 634 636 to to TO 637 640 the the DT 641 643 4X 4x NN 644 653 NF-AT-Oct nf-at-oct NN 654 663 construct construct NN 664 667 did do VBD 668 671 not not RB 672 678 impart impart VB 679 682 the the DT 683 690 ability ability NN 691 693 to to TO 694 696 be be VB 697 705 affected affect VBN 706 708 by by IN 709 715 anergy anergy NN 715 716 , , , 717 720 but but CC 721 729 addition addition NN 730 732 of of IN 733 736 the the DT 737 741 -236 -236 CD 742 744 to to TO 745 748 -96 -96 CD 749 757 sequence sequence NN 758 761 did do VBD 761 762 , , , 763 776 demonstrating demonstrate VBG 777 781 that that IN 782 788 anergy anergy NN 789 791 is be VBZ 792 794 an an DT 795 801 active active JJ 802 812 inhibitory inhibitory JJ 813 820 process process NN 821 824 and and CC 825 829 that that IN 830 834 more more JJR 835 839 than than IN 840 843 the the DT 844 852 presence presence NN 853 855 of of IN 856 859 the the DT 860 864 -150 -150 CD 865 869 AP-1 ap-1 NN 870 877 binding binding NN 878 882 site site NN 883 884 ( ( ( 884 888 -152 -152 CD 889 891 to to TO 892 896 -147 -147 CD 896 897 ) ) ) 898 900 is be VBZ 901 909 required require VBN 910 912 to to TO 913 920 mediate mediate VB 921 924 the the DT 925 931 effect effect NN 931 932 . . . 933 943 Mutational mutational JJ 944 951 studies study NNS 952 954 of of IN 955 958 the the DT 959 963 -236 -236 CD 964 966 to to TO 967 970 -96 -96 CD 971 979 sequence sequence NN 980 989 indicated indicate VBD 990 994 that that IN 995 998 the the DT 999 1007 presence presence NN 1008 1010 of of IN 1011 1015 both both CC 1016 1019 the the DT 1020 1024 -130 -130 CD 1025 1034 AP-1-like ap-1-like JJ 1035 1039 site site NN 1040 1041 ( ( ( 1041 1045 -187 -187 CD 1046 1048 to to TO 1049 1053 -181 -181 CD 1053 1054 ) ) ) 1055 1058 and and CC 1059 1062 the the DT 1063 1067 -150 -150 CD 1068 1076 proximal proximal JJ 1077 1081 AP-1 ap-1 NN 1082 1086 site site NN 1087 1091 were be VBD 1092 1101 necessary necessary JJ 1102 1104 to to TO 1105 1112 observe observe VB 1113 1119 anergy anergy NN 1119 1120 . . . 1121 1128 Because because IN 1129 1132 the the DT 1133 1137 -180 -180 CD 1138 1142 site site NN 1143 1145 is be VBZ 1146 1149 not not RB 1150 1158 required require VBN 1159 1162 for for IN 1163 1179 trans-activation trans-activation NN 1179 1180 , , , 1181 1183 it it PRP 1184 1187 was be VBD 1188 1196 possible possible JJ 1197 1199 to to TO 1200 1207 confirm confirm VB 1208 1210 by by IN 1211 1219 mutation mutation NN 1220 1222 in in IN 1223 1226 the the DT 1227 1233 normal normal JJ 1234 1239 mouse mouse NN 1240 1244 IL-2 il-2 NN 1245 1253 enhancer enhancer NN 1254 1258 that that IN 1259 1263 this this DT 1264 1268 site site NN 1269 1271 is be VBZ 1272 1282 absolutely absolutely RB 1283 1292 essential essential JJ 1293 1296 for for IN 1297 1303 anergy anergy NN 1304 1313 induction induction NN 1313 1314 . . . 1315 1318 The the DT 1319 1327 simplest simple JJS 1328 1333 model model NN 1334 1336 to to TO 1337 1344 explain explain VB 1345 1350 these these DT 1351 1358 results result NNS 1359 1361 is be VBZ 1362 1366 that that IN 1367 1373 anergy anergy NN 1374 1376 is be VBZ 1377 1385 mediated mediate VBN 1386 1388 by by IN 1389 1390 a a DT 1391 1398 complex complex NN 1399 1401 of of IN 1402 1410 multiple multiple JJ 1411 1424 transcription transcription NN 1425 1432 factors factor NNS 1433 1437 that that WDT 1438 1443 exert exert VBP 1444 1445 a a DT 1446 1456 cis-acting cis-acting JJ 1457 1465 dominant dominant JJ 1466 1474 negative negative JJ 1475 1485 regulatory regulatory JJ 1486 1492 effect effect NN 1493 1495 on on IN 1496 1499 the the DT 1500 1516 trans-activation trans-activation NN 1517 1519 of of IN 1520 1523 the the DT 1524 1528 IL-2 il-2 NN 1529 1533 gene gene NN 1533 1534 . . .