title: Effects of cyclic AMP on expression of LFA-1, Mac-1, and VLA-4 and eosinophilic differentiation of a human leukemia cell line, EoL-1.
abstract: We examined the effect of dibutyryl cAMP (dbcAMP) on the expression of LFA-1 (CD11a/CD18), Mac-1 (CD11b/CD18), and VLA-4 (CD49/CD29) and on eosinophilic differentiation of a human leukemia cell line, EoL-1. Dibutyryl cAMP induced eosinophilic differentiation of EoL-1 cells from 6-9 days after the start of culture with down-regulation of CD11a, CD18, and CD49 expression and up-regulation of CD11b expression. Changes in integrin expression, except for CD18, were seen predominantly in the fraction containing eosinophilic granule-positive cells, suggesting that the changes were dependent on eosinophilic differentiation. On the other hand, dbcAMP-induced changes of integrin expression were reversible and were not seen on day 9 when dbcAMP was removed on day 3, whereas eosinophilic differentiation was still present. A combination of G-CSF and TNF-alpha, which also induced eosinophilic differentiation of EoL-1 cells, increased CD11b expression slightly but had no significant effect on the expression of the other integrins. Butyrate and PMA up-regulated CD11b expression without eosinophilic differentiation. The results collectively suggest that the regulation of integrin expression on EoL-1 cells is partly dependent and partly not dependent on eosinophilic differentiation. The possible involvement of protein kinase A and protein kinase C in these changes is suggested.
authors.affiliation: Department of Pediatrics, Kyoto University, Japan.
authors.forename: E Y
authors.initials: EY
authors.lastname: Jung
authors.forename: Y
authors.initials: Y
authors.lastname: Ohshima
authors.forename: N
authors.initials: N
authors.lastname: Shintaku
authors.forename: S
authors.initials: S
authors.lastname: Sumimoto
authors.forename: T
authors.initials: T
authors.lastname: Heike
authors.forename: K
authors.initials: K
authors.lastname: Katamura
authors.forename: M
authors.initials: M
authors.lastname: Mayumi
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D015703:Antigens, CD / Q000032:analysis* / Q000502:physiology; D003994:Bucladesine / Q000494:pharmacology; D002087:Butyrates / Q000494:pharmacology; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D000242:Cyclic AMP / Q000494:pharmacology*; D004804:Eosinophils / Q000737:chemistry* / Q000473:pathology*; D005455:Fluorescent Antibody Technique; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D006801:Humans; D019012:Integrin beta1; D016023:Integrins / Q000032:analysis* / Q000502:physiology; D007546:Isoquinolines / Q000494:pharmacology; D007938:Leukemia / Q000097:blood* / Q000473:pathology*; D016169:Lymphocyte Function-Associated Antigen-1 / Q000032:analysis* / Q000502:physiology; D016177:Macrophage-1 Antigen / Q000032:analysis* / Q000502:physiology; D010879:Piperazines / Q000494:pharmacology; D011493:Protein Kinase C / Q000037:antagonists & inhibitors; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D015703:Antigens, CD; D002087:Butyrates; D019012:Integrin beta1; D016023:Integrins; D007546:Isoquinolines; D016169:Lymphocyte Function-Associated Antigen-1; D016177:Macrophage-1 Antigen; D010879:Piperazines; D014409:Tumor Necrosis Factor-alpha; D016179:Granulocyte Colony-Stimulating Factor; D003994:Bucladesine; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; C053177:N-(2-(methylamino)ethyl)-5-isoquinolinesulfonamide; D000242:Cyclic AMP; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate