title: Antiallergic drugs, azelastine hydrochloride and epinastine hydrochloride, inhibit ongoing IgE secretion of rat IgE-producing hybridoma FE-3 cells.
abstract: We asked whether or not antiallergic drugs, azelastine hydrochloride and epinastine hydrochloride, inhibit IgE secretion from IgE-producing hybridoma FE-3 cells. FE-3 cells were cultured in the presence of azelastine or epinastine for 24 h, washed in phosphate-buffered saline , and then recultured in the medium in the absence of the antiallergic drugs. IgE levels in the cultured medium as well as those in the cytoplasm of FE-3 cells were measured by enzyme-linked immunosorbent assay. mRNA levels of Cepsilon, activation-induced cytidine deaminase (AID), XBP-1, and Bip were estimated by northern blot or reverse transcriptase polymerase chain reaction analysis. The activities of nuclear factor-kappa B (NF-kappaB) were analyzed by electrophoretic mobility shift assay (EMSA). Phosphorylation of I kappa B alpha (IkappaBalpha) was analyzed by immunoprecipitation followed by western blot analysis. IgE levels in the cultured medium and in the microsome fraction were lower on the treatment with 10(-5) M azelastine or epinastine than those on the treatment with vehicle. Cepsilon and AID mRNA levels were lower on the treatment with 10(-5) M azelastine than those on the treatment with vehicle, but were not decreased on the treatment with 10(-5) M epinastine. XBP-1 and Bip mRNA levels were not altered following treatment of the antiallergic drugs. Azelastine at 10(-5) M, but not epinastine, reduced DNA binding activity of NF-kappaB and also diminished IkappaBalpha phosphorylation, leading to sustaining IkappaBalpha protein levels. These findings suggest that azelastine exerts its inhibitory effect on the IgE secretion from FE-3 cells through the inhibition of Cepsilon mRNA expression, and that the inhibitory effect of epinastine is, at least in part, due to suppression of IgE synthesis at the post-transcriptional level.
authors.affiliation: 1st Department of Physiology, Unit of Physiological Science, School of Medicine, University of the Ryukyus, 207 Uehara, Nishihara, Okinawa 903-0215, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Hanashiro
authors.forename: Masanori
authors.initials: M
authors.lastname: Sunagawa
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Tokeshi
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Nakasone
authors.forename: Shigeto
authors.initials: S
authors.lastname: Ohta
authors.forename: Mariko
authors.initials: M
authors.lastname: Nakamura
authors.forename: Tadayoshi
authors.initials: T
authors.lastname: Kosugi
mesh_terms: D000818:Animals; D018926:Anti-Allergic Agents / Q000494:pharmacology*; D050976:Basic-Leucine Zipper Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D015152:Blotting, Northern; D015153:Blotting, Western; D003564:Cytidine Deaminase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D004268:DNA-Binding Proteins; D003984:Dibenzazepines / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D024202:Electrophoretic Mobility Shift Assay; D015870:Gene Expression / Q000187:drug effects; D006360:Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D006825:Hybridomas / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D020672:I-kappa B Proteins / Q000378:metabolism; D007093:Imidazoles / Q000494:pharmacology*; D007073:Immunoglobulin E / Q000378:metabolism*; D018832:Molecular Chaperones / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D016328:NF-kappa B / Q000235:genetics / Q000378:metabolism; D009363:Neoplasm Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D009841:Oligonucleotides / Q000235:genetics / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D010793:Phthalazines / Q000494:pharmacology*; D011485:Protein Binding / Q000187:drug effects; D017510:Protein Folding; D051744:Protein Kinase C-epsilon / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D000071701:Regulatory Factor X Transcription Factors; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014157:Transcription Factors; D000071717:X-Box Binding Protein 1; D000098830:AICDA (Activation-Induced Cytidine Deaminase); D000091342:Endoplasmic Reticulum Chaperone BiP
chemical_list: D018926:Anti-Allergic Agents; D050976:Basic-Leucine Zipper Transcription Factors; D003564:Cytidine Deaminase; D004268:DNA-Binding Proteins; D003984:Dibenzazepines; D006360:Heat-Shock Proteins; D020672:I-kappa B Proteins; D007093:Imidazoles; D007073:Immunoglobulin E; D018832:Molecular Chaperones; D016328:NF-kappa B; D009363:Neoplasm Proteins; D009841:Oligonucleotides; D010793:Phthalazines; D051744:Protein Kinase C-epsilon; D012333:RNA, Messenger; D000071701:Regulatory Factor X Transcription Factors; D014157:Transcription Factors; D000071717:X-Box Binding Protein 1; D000098830:AICDA (Activation-Induced Cytidine Deaminase); C051684:GRP78 protein, rat; D000091342:Endoplasmic Reticulum Chaperone BiP; C000605545:Xbp1 protein, rat; C053090:epinastine; C020976:azelastine