title: Composition of sea urchin egg homogenate determines its potency to inositol trisphosphate and cyclic ADPRibose-induced Ca2+ release.
abstract: Of the three intracellular Ca2+ signalling molecules (InsP3, cADPR and NAADP) sea urchin egg homogenate has been used in the identification and characterisation of two, cADPR and NAADP. Homogenate is prepared in a Na+/Cl- substitute of N-Methyl glucamine (NMG)/gluconate. To determine how media composition affects Ca2+ release we replaced NMG with various sugars or glycine and found a dramatic improvement in InsP3 mediated Ca2+ release. Conversely the response to cADPR was diminished, whilst NAADP was unaffected. Therefore modifying media composition may be an important consideration in using homogenate to study Ca2+ release for future studies.
authors.affiliation: Institute for Cell and Molecular Biosciences, The Medical School, Framlington Place, University of Newcastle, Newcastle NE2 4HH, UK. k.t.jones@ncl.ac.uk
authors.forename: Keith T
authors.initials: KT
authors.lastname: Jones
authors.forename: Karl
authors.initials: K
authors.lastname: Swann
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D036563:Cyclic ADP-Ribose / Q000494:pharmacology*; D015544:Inositol 1,4,5-Trisphosphate / Q000494:pharmacology*; D010063:Ovum / Q000187:drug effects* / Q000378:metabolism; D012617:Sea Urchins
chemical_list: D036563:Cyclic ADP-Ribose; D015544:Inositol 1,4,5-Trisphosphate; D002118:Calcium