0 14 Thrombopoietin Thrombopoietin NNP 15 23 supports support VBZ 24 26 in in FW 27 32 vitro vitro FW 33 42 erythroid erythroid JJ 43 58 differentiation differentiation NN 59 62 via via IN 63 66 its its PRP$ 67 75 specific specific JJ 76 84 receptor receptor NN 85 90 c-Mpl c-mpl NN 91 93 in in IN 94 95 a a DT 96 101 human human JJ 102 110 leukemia leukemia NN 111 115 cell cell NN 116 120 line line NN 120 121 . . . 123 137 Thrombopoietin Thrombopoietin NNP 138 139 ( ( ( 139 142 TPO TPO NNP 142 143 ) ) ) 144 148 acts act VBZ 149 151 on on IN 152 168 megakaryopoiesis megakaryopoiesis NN 169 172 and and CC 173 187 erythropoiesis erythropoiesis NN 188 190 in in FW 191 196 vitro vitro FW 197 200 and and CC 201 203 in in FW 204 208 vivo vivo FW 208 209 . . . 210 212 We we PRP 213 221 isolated isolate VBD 222 223 a a DT 224 229 novel novel JJ 230 237 subline subline NN 237 238 , , , 239 247 UT-7/GMT UT-7/GMT NNP 247 248 , , , 249 253 from from IN 254 257 the the DT 258 263 human human JJ 264 272 leukemia leukemia NN 273 277 cell cell NN 278 282 line line NN 283 290 UT-7/GM UT-7/GM NNP 291 292 ( ( ( 292 294 N. N. NNP 295 302 Komatsu Komatsu NNP 302 303 , , , 304 306 et et FW 307 310 al. al. FW 310 311 , , , 312 317 Blood Blood NNP 317 318 , , , 319 321 89 89 CD 321 322 : : : 323 332 4021-4033 4021-4033 CD 332 333 , , , 334 338 1997 1997 CD 338 339 ) ) ) 339 340 . . . 341 342 A a DT 343 348 small small JJ 349 359 population population NN 360 362 of of IN 363 370 UT-7/GM UT-7/GM NNP 371 376 cells cell NNS 377 387 positively positively RB 388 395 stained stain VBN 396 399 for for IN 400 410 hemoglobin hemoglobin NN 411 412 ( ( ( 412 414 Hb Hb NNP 414 415 ) ) ) 416 421 after after IN 422 423 a a DT 424 429 7-day 7-day JJ 430 438 exposure exposure NN 439 441 to to TO 442 445 TPO TPO NNP 445 446 . . . 447 451 More more JJR 452 456 than than IN 457 459 50 50 CD 459 460 % % NN 461 463 of of IN 464 475 TPO-treated tpo-treated JJ 476 484 UT-7/GMT ut-7/gmt NN 485 490 cells cell NNS 491 501 positively positively RB 502 509 stained stain VBN 510 513 for for IN 514 516 Hb Hb NNP 516 517 . . . 518 523 Using use VBG 524 532 UT-7/GMT ut-7/gmt NN 533 538 cells cell NNS 538 539 , , , 540 542 we we PRP 543 551 examined examine VBD 552 555 how how WRB 556 559 TPO TPO NNP 560 568 promotes promote VBZ 569 586 hemoglobinization hemoglobinization NN 586 587 . . . 588 591 TPO TPO NNP 592 599 induced induce VBD 600 608 tyrosine tyrosine NN 609 624 phosphorylation phosphorylation NN 625 627 of of IN 628 631 the the DT 632 635 TPO TPO NNP 636 644 receptor receptor NN 645 648 but but CC 649 652 not not RB 653 656 the the DT 657 671 erythropoietin erythropoietin NN 672 673 ( ( ( 673 676 EPO EPO NNP 676 677 ) ) ) 678 686 receptor receptor NN 686 687 . . . 688 693 There there EX 694 697 was be VBD 698 700 no no DT 701 712 competition competition NN 713 720 between between IN 721 724 TPO TPO NNP 725 728 and and CC 729 732 EPO EPO NNP 733 736 for for IN 737 744 binding binding NN 745 747 to to TO 748 751 EPO EPO NNP 752 760 receptor receptor NN 760 761 . . . 762 767 These these DT 768 776 findings finding NNS 777 784 suggest suggest VBP 785 789 that that IN 790 793 TPO TPO NNP 794 797 has have VBZ 798 799 a a DT 800 806 direct direct JJ 807 813 effect effect NN 814 816 on on IN 817 834 hemoglobinization hemoglobinization NN 835 838 via via IN 839 840 a a DT 841 849 specific specific JJ 850 858 receptor receptor NN 859 861 on on IN 862 870 UT-7/GMT UT-7/GMT NNP 871 876 cells cell NNS 876 877 . . . 878 889 Isoelectric isoelectric JJ 890 898 focusing focusing NN 899 911 demonstrated demonstrate VBD 912 916 that that IN 917 920 TPO TPO NNP 921 928 induced induce VBD 929 934 fetal fetal JJ 935 938 and and CC 939 944 adult adult JJ 945 947 Hb Hb NNP 948 957 synthesis synthesis NN 957 958 , , , 959 966 whereas whereas IN 967 970 EPO EPO NNP 971 978 induced induce VBD 979 988 embryonic embryonic JJ 988 989 , , , 990 995 fetal fetal JJ 995 996 , , , 997 1000 and and CC 1001 1006 adult adult JJ 1007 1009 Hb Hb NNP 1010 1019 synthesis synthesis NN 1019 1020 . . . 1021 1025 Thus thus RB 1025 1026 , , , 1027 1030 our our PRP$ 1031 1035 data datum NNS 1036 1043 suggest suggest VBP 1044 1048 that that IN 1049 1052 TPO TPO NNP 1053 1056 has have VBZ 1057 1058 a a DT 1059 1067 distinct distinct JJ 1068 1074 action action NN 1075 1077 on on IN 1078 1092 erythropoiesis erythropoiesis NN 1092 1093 . . .