title: Expression of tumor necrosis factor-related apoptosis-inducing ligand, Apo2L, and its receptors in myelodysplastic syndrome: effects on in vitro hemopoiesis.
abstract: Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL), a member of the tumor necrosis factor (TNF) family, binds to several cell-surface receptors with distinct functions (agonistic receptors 1 and 2 [TRAIL-R1, TRAIL-R2]; decoy receptors 3 and 4 [TRAIL-R3, TRAIL-R4]). Expression and function was characterized in patients with myelodysplastic syndromes (MDSs). While normal marrow showed negligible expression of TRAIL and receptors (except TRAIL-R3), TRAIL and all receptors were constitutively expressed in MDS marrow. Following TRAIL exposure, MDS marrow showed significant increases in apoptosis, whereas normal marrow, except for a subset of CD34+ precursors, did not (P =.012). Marrow from 21 patients with MDS was then propagated in long-term cultures in the presence or absence of TRAIL. While in advanced MDS (refractory anemia with excess blasts in transformation [RAEB-T] and tAML [MDS transformed into AML]), colony numbers decreased in the presence of TRAIL (63.0% +/- 10.4% of untreated group [100%]), numbers increased in patients with RA or RAEB (160.2% +/- 90.5% of untreated group). TRAIL eliminated preferentially clonally abnormal cells as identified by chromosomal markers. Thus, TRAIL and receptor expression differed significantly between normal and MDS marrow, and TRAIL modulated in vitro hemopoiesis in MDS dependent upon disease stage but not, to a detectable extent, in normal marrow.
authors.affiliation: Clinical Research Division, Fred Hutchinson Cancer Research Center and the Department of Medicine, University of Washington, Seattle, WA 98109-1024, USA.
authors.forename: D Y
authors.initials: DY
authors.lastname: Zang
authors.forename: R G
authors.initials: RG
authors.lastname: Goodwin
authors.forename: M R
authors.initials: MR
authors.lastname: Loken
authors.forename: E
authors.initials: E
authors.lastname: Bryant
authors.forename: H J
authors.initials: HJ
authors.lastname: Deeg
mesh_terms: D000782:Aneuploidy; D017209:Apoptosis; D051017:Apoptosis Regulatory Proteins; D015153:Blotting, Western; D001854:Bone Marrow Cells / Q000378:metabolism; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics; D002478:Cells, Cultured / Q000378:metabolism; D002869:Chromosome Aberrations; D003114:Colony-Forming Units Assay; D058851:GPI-Linked Proteins; D005786:Gene Expression Regulation; D006410:Hematopoiesis; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D047908:Intracellular Signaling Peptides and Proteins; D016350:Leucine Zippers; D008562:Membrane Glycoproteins / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology; D009190:Myelodysplastic Syndromes / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D009363:Neoplasm Proteins / Q000096:biosynthesis / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000096:biosynthesis* / Q000235:genetics; D053320:Receptors, Tumor Necrosis Factor, Member 10c; D011993:Recombinant Fusion Proteins / Q000494:pharmacology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D053221:TNF-Related Apoptosis-Inducing Ligand; D053319:Tumor Necrosis Factor Decoy Receptors; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology
chemical_list: D051017:Apoptosis Regulatory Proteins; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; C506386:CFLAR protein, human; D002352:Carrier Proteins; D058851:GPI-Linked Proteins; D016298:Hematopoietic Cell Growth Factors; D047908:Intracellular Signaling Peptides and Proteins; D008562:Membrane Glycoproteins; D009363:Neoplasm Proteins; D012333:RNA, Messenger; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; D053320:Receptors, Tumor Necrosis Factor, Member 10c; D011993:Recombinant Fusion Proteins; D053221:TNF-Related Apoptosis-Inducing Ligand; C105190:TNFRSF10A protein, human; C505639:TNFRSF10B protein, human; C108661:TNFRSF10C protein, human; C505653:TNFSF10 protein, human; D053319:Tumor Necrosis Factor Decoy Receptors; D014409:Tumor Necrosis Factor-alpha