title: Influence of differential expression of acetylcholinesterase in brain and muscle on respiration.
abstract: A mouse strain with a deleted acetylcholinesterase (AChE) gene (AChE knockout) shows a decreased inspiration time and increased tidal volume and ventilation .To investigate the respective roles of AChE in brain and muscle, we recorded respiration by means of whole-body plethysmography in knockout mice with tissue selective deletions in AChE expression. A mouse strain with the anchoring domains of AChE deleted (del E5+6 knockout mice) has very low activity in the brain and neuromuscular junction, but increased monomeric AChE in serum. A mouse strain with deletion of the muscle specific region of AChE (del i1RR knockout mice) exhibits no expression in muscle, but unaltered expression in the central nervous system. Neither strain exhibits the pronounced phenotypic traits observed in the complete AChE knockout strain. A third strain lacking the anchor molecule PRiMA, has no functional AChE and butyrylcholinesterase (BChE) in brain and an unaltered respiratory function. BChE inhibition by bambuterol decreases tidal volume and body temperature in del E5+6 and i1RR knockout strains, but not in PRiMA deletion or wild-type controls. We find that: (1) deletion of the full AChE gene is required for a pronounced alteration in respiratory phenotype, (2) BChE is involved in respiratory muscles contraction and temperature control in del E5+6 and i1RR knockout mice, and (3) AChE expression requiring a gene product splice to either exons 5 and 6 or regulated by intron1 influences temperature control.
authors.affiliation: Neurobiologie Génétique et Intégrative, Institut de Neurobiologie Alfred Fessard, C.N.R.S., 91190 Gif-sur-Yvette, France.
authors.forename: Eliane
authors.initials: E
authors.lastname: Boudinot
authors.forename: Véronique
authors.initials: V
authors.lastname: Bernard
authors.forename: Shelley
authors.initials: S
authors.lastname: Camp
authors.forename: Palmer
authors.initials: P
authors.lastname: Taylor
authors.forename: Jean
authors.initials: J
authors.lastname: Champagnat
authors.forename: Eric
authors.initials: E
authors.lastname: Krejci
authors.forename: Arthur S
authors.initials: AS
authors.lastname: Foutz
mesh_terms: D000110:Acetylcholinesterase / Q000172:deficiency / Q000378:metabolism*; D000704:Analysis of Variance; D000818:Animals; D001831:Body Temperature / Q000235:genetics; D001921:Brain / Q000187:drug effects / Q000201:enzymology*; D001993:Bronchodilator Agents / Q000494:pharmacology; D002091:Butyrylcholinesterase / Q000378:metabolism; D005091:Exons / Q000235:genetics; D005260:Female; D005786:Gene Expression Regulation / Q000235:genetics / Q000502:physiology*; D006935:Hypercapnia / Q000235:genetics / Q000503:physiopathology; D000860:Hypoxia / Q000235:genetics / Q000503:physiopathology; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D009132:Muscles / Q000187:drug effects / Q000201:enzymology*; D010993:Plethysmography, Whole Body / Q000379:methods; D012123:Pulmonary Ventilation / Q000235:genetics; D012119:Respiration / Q000187:drug effects / Q000235:genetics*; D017384:Sequence Deletion / Q000235:genetics; D013726:Terbutaline / Q000031:analogs & derivatives / Q000494:pharmacology; D013990:Tidal Volume / Q000235:genetics
chemical_list: D001993:Bronchodilator Agents; D000110:Acetylcholinesterase; D002091:Butyrylcholinesterase; D013726:Terbutaline; C047766:bambuterol