title: Production and regulation of eotaxin-2/CCL24 in a differentiated human leukemic cell line, HT93.
abstract: When a human leukemic cell line, HT93 was incubated with all-trans retinoic acid (ATRA), IL-5, or both, this cell line was differentiated into eosinophic lineage, in that an eosinophilic specific granule proteins, major basic protein (MBP) and eosinophil peroxidase (EPO) appeared. Both CD11b and CC chemokine receptor, CCR3 expression were upregulated, while CD71 expression was downregulated by ATRA or ATRA+IL-5. Concomitantly, marked production of eotaxin-2/CCL24 was observed, but no production of eotaxin-1/CCL11 and eotaxin-3/CCL26 was detected. Since only 20 to 30% cells incubated with ATRA became positive for CCR3, CCR3(+) population was enriched by a magnetic activated cell sorter (MACS). Enriched CCR3(+) population produced higher eotaxin-2/CCL24 than the CCR3(-) population, indicating that differentiated eosinophils are capable of producing eotaxin-2/CCL24. During the ATRA-induced differentiation, expression of a transcriptional factor, GATA-1 was significantly increased. Introduction of siRNA against GATA-1 markedly reduced the ATRA-induced differentiation markers including CD11b and CCR3, as well as reduced eotaxin-2/CCL24 production. Finally, ATRA-induced differentiation and eotaxin-2/CCL24 production were greatly enhanced in the GATA-1-overexpressed clones. These results indicate that the ability to produce eotaxin-2/CCL24 is acquired during the differentiation into eosinophilic lineage which is dependent on GATA-1 expression.
authors.affiliation: Department of Biochemistry, Kyoritsu University of Pharmacy, Minato-ku, Tokyo, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Yoshida
authors.forename: Eriko
authors.initials: E
authors.lastname: Aizu-Yokota
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Sonoda
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Moriwaki
authors.forename: Kenji
authors.initials: K
authors.lastname: Kishi
authors.forename: Tadashi
authors.initials: T
authors.lastname: Kasahara
mesh_terms: D015153:Blotting, Western; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology; D045744:Cell Line, Tumor; D019070:Cell Lineage / Q000187:drug effects / Q000502:physiology; D054423:Chemokine CCL24; D019742:Chemokines, CC / Q000096:biosynthesis*; D017931:DNA Primers; D015536:Down-Regulation / Q000187:drug effects; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D050982:GATA1 Transcription Factor / Q000235:genetics / Q000502:physiology; D050989:GATA2 Transcription Factor / Q000235:genetics / Q000502:physiology; D015972:Gene Expression Regulation, Neoplastic / Q000502:physiology; D006801:Humans; D015848:Interleukin-5 / Q000096:biosynthesis; D007938:Leukemia / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000494:pharmacology; D054397:Receptors, CCR3; D019707:Receptors, Chemokine / Q000096:biosynthesis / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014212:Tretinoin / Q000494:pharmacology
chemical_list: C515484:CCL24 protein, human; C515350:CCR3 protein, human; D054423:Chemokine CCL24; D019742:Chemokines, CC; D017931:DNA Primers; D050982:GATA1 Transcription Factor; D050989:GATA2 Transcription Factor; D015848:Interleukin-5; D034741:RNA, Small Interfering; D054397:Receptors, CCR3; D019707:Receptors, Chemokine; D014212:Tretinoin