title: Inositol 1,4,5-trisphosphate transduction cascade in taste reception of the fleshfly, Boettcherisca peregrina.
abstract: The role of an inositol 1,4,5-trisphosphate (IP3)-mediated transduction cascade in the response of taste receptor cells of the fleshfly Boettcherisca peregrina was investigated by using the following reagents: neomycin (an inhibitor of IP3 production), U73122 (an inhibitor of phospholipase C), adenophostin A (an agonist of the IP3-gated channel), IP3, ruthenium red (a blocker of the IP3-gated channel), and 2-aminoethoxydiphenylborate (2-APB; an antagonist of the IP3-gated channel). For introduction into the receptor cell, the reagents were mixed with a detergent, deoxycholate (DOC). After treatment with neomycin + DOC or U73122 + DOC, the response of the sugar receptor cell to sugars was depressed compared with responses after treatment with DOC alone. During the treatment of adenophostin A + DOC, the response of the sugar receptor cell was elicited. After treatment with IP3 + DOC, the response of the sugar receptor cell to sugars and to amino acids was apparently enhanced. When taste stimuli were administered in the presence of ruthenium red or 2-APB, the response of the sugar receptor cell to glucose were inhibited. The expression of genes for substances involved in the IP3 transduction cascade, such as G protein alpha subunit (dGqalpha), phospholipase C (norpA), and IP3 receptor (itpr), were examined in the taste receptor cell of the fruitfly Drosophila melanogaster by using the pox-neuro70 mutant (poxn70), which lacks taste receptor cells. The expressed levels of dGqalpha and itpr in the tarsus of poxn70 mutant flies were reduced compared with those of wild-type flies. These results suggest that the IP3 transduction cascade is involved in the response of the sugar receptor cell of the fly.
authors.affiliation: Biological Institute, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan. kogane@mail.cc.tohoku.ac.jp
authors.forename: Masayuki
authors.initials: M
authors.lastname: Koganezawa
authors.forename: Ichiro
authors.initials: I
authors.lastname: Shimada
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D030801:Animals, Genetically Modified; D002120:Calcium Channel Agonists / Q000494:pharmacology; D015220:Calcium Channels / Q000235:genetics / Q000378:metabolism*; D003840:Deoxycholic Acid / Q000494:pharmacology; D003902:Detergents / Q000494:pharmacology; D004175:Diptera; D029721:Drosophila Proteins; D004331:Drosophila melanogaster; D004963:Estrenes / Q000494:pharmacology; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D019204:GTP-Binding Proteins / Q000378:metabolism; D015870:Gene Expression / Q000502:physiology; D020962:Heterotrimeric GTP-Binding Proteins / Q000235:genetics; D007202:Indicators and Reagents / Q000494:pharmacology; D015544:Inositol 1,4,5-Trisphosphate / Q000378:metabolism*; D053496:Inositol 1,4,5-Trisphosphate Receptors; D009355:Neomycin / Q000494:pharmacology; D009419:Nerve Tissue Proteins / Q000235:genetics; D051761:Paired Box Transcription Factors; D043265:Phosphatidylinositol Diacylglycerol-Lyase; D010726:Phosphodiesterase Inhibitors / Q000494:pharmacology; D054799:Phospholipase C beta; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D011760:Pyrrolidinones / Q000494:pharmacology; D018160:Receptors, Cytoplasmic and Nuclear / Q000235:genetics / Q000378:metabolism*; D012430:Ruthenium Red / Q000494:pharmacology; D015398:Signal Transduction / Q000502:physiology*; D013649:Taste / Q000187:drug effects / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics; D010738:Type C Phospholipases / Q000235:genetics
chemical_list: D002120:Calcium Channel Agonists; D015220:Calcium Channels; D003902:Detergents; D029721:Drosophila Proteins; D004963:Estrenes; D007202:Indicators and Reagents; D053496:Inositol 1,4,5-Trisphosphate Receptors; D009419:Nerve Tissue Proteins; D051761:Paired Box Transcription Factors; D010726:Phosphodiesterase Inhibitors; C073863:Poxn protein, Drosophila; D011500:Protein Synthesis Inhibitors; D011760:Pyrrolidinones; D018160:Receptors, Cytoplasmic and Nuclear; D014157:Transcription Factors; D003840:Deoxycholic Acid; D012430:Ruthenium Red; C060229:1-(6-((3-methoxyestra-1,3,5(10)-trien-17-yl)amino)hexyl)-1H-pyrrole-2,5-dione; C085029:adenophostin A; D015544:Inositol 1,4,5-Trisphosphate; D010738:Type C Phospholipases; C468371:NorpA protein, Drosophila; D054799:Phospholipase C beta; D019204:GTP-Binding Proteins; D043802:GTP-Binding Protein alpha Subunits, Gq-G11; D020962:Heterotrimeric GTP-Binding Proteins; D043265:Phosphatidylinositol Diacylglycerol-Lyase; D009355:Neomycin; D000241:Adenosine