Article (Scientific journals)
The absence of expression of the three isoenzymes of inositol 1,4,5-trisphosphate 3-kinase does not prevent the formation of inositol pentakisphosphate and hexakisphosphate in mouse embryonic fibroblasts
Leyman, A.; Pouillon, V.; Bostan, A. et al.
2007In Cellular Signalling, 19, p. 1497-1504
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Keywords :
Inositol 1,4,5-trisphosphate; Ipmk; IP3 3-kinases; Fibroblasts
Abstract :
[en] The activation of phospholipase C leads to the formation of both I(1,4,5)P(3) and diacylglycerol (DAG). I(1,4,5)P(3) can be metabolized by dephosphorylation catalyzed by Type I I(1,4,5)P(3) 5-phosphatase and by enzymatic phosphorylation to various inositol phosphates. This last step is catalyzed by three mammalian isoenzymes that specifically phosphorylate the 3-phosphate position of the inositol ring Itpka, Itpkb and Itpkc and a less specific enzyme Ipmk (or inositol multikinase) that phosphorylates I(1,4,5)P(3) at the D-3 and D-6 positions. This study was performed in mice cells in order to understand the synthetic pathway of IP5 and IP6 following PLC stimulation and possible link with Itpk activity. Mouse embryonic fibroblasts (MEF) were prepared from Itpkb(-/-) Itpkc(-/-) mice. Western blot and RT-PCR analysis show that the cells do not express Itpka. In contrast, they do express Ipmk. The cells still produce IP5 and IP6. Our data show that the absence of expression of the three isoenzymes of Itpk does not prevent the formation of IP5 and IP6, at least in mouse embryonic fibroblasts. The nuclear Ipmk plays therefore a critical role in the metabolism of I(1,4,5)P(3) and production of highly phosphorylated IP5 and IP6
Disciplines :
Biochemistry, biophysics & molecular biology
Genetics & genetic processes
Author, co-author :
Leyman, A.;  Université Libre de Bruxelles - ULB > Interdisciplinary Research Institute (IRIBHM)
Pouillon, V.;  Université Libre de Bruxelles - ULB > Interdisciplinary Research Institute (IRIBHM)
Bostan, A.;  Université Libre de Bruxelles - ULB > Interdisciplinary Research Institute (IRIBHM)
Schurmans, Stéphane  ;  Université de Liège - ULiège (et ULB) > Département de sciences fonctionnelles > Biochimie métabolique vétérinaire
Erneux, C.;  Université Libre de Bruxelles - ULB > Interdisciplinary Research Institute (IRIBHM)
Pesesse, X.;  Université Libre de Bruxelles - ULB > Interdisciplinary Research Institute (IRIBHM)
Language :
English
Title :
The absence of expression of the three isoenzymes of inositol 1,4,5-trisphosphate 3-kinase does not prevent the formation of inositol pentakisphosphate and hexakisphosphate in mouse embryonic fibroblasts
Publication date :
2007
Journal title :
Cellular Signalling
ISSN :
0898-6568
eISSN :
1873-3913
Publisher :
Elsevier Science, Oxford, United Kingdom
Volume :
19
Pages :
1497-1504
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRSM - Fonds de la Recherche Scientifique Médicale [BE]
Available on ORBi :
since 20 January 2010

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