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. 1990 Jul 1;269(1):195–200. doi: 10.1042/bj2690195

Identification in extracts from AR4-2J cells of inositol 1,4,5-trisphosphate by its susceptibility to inositol 1,4,5-trisphosphate 3-kinase and 5-phosphatase.

K Nogimori 1, F S Menniti 1, J W Putney Jr 1
PMCID: PMC1131551  PMID: 2165394

Abstract

The identity of 3H-labelled material ascribed to Ins(1,4,5)P3 in resting or bombesin-stimulated myo-[3H]inositol-labelled AR4-2J cells was investigated by determining its ability to serve as substrate for partially purified Ins(1,4,5)P3/Ins(1,3,4,5)-P4 5-phosphatase and Ins(1,4,5)P3 3-kinase. This 3H-labelled material was metabolized by these two enzymes at rates which were indistinguishable from those for an internal [32P]Ins(1,4,5)P3 standard, establishing its identity as authentic Ins(1,4,5)P3. In addition, and in contrast with findings in earlier studies utilizing substance P as an agonist, prolonged stimulation with bombesin resulted in an increase in an InsP4 which was degraded by Ins(1,4,5)P3/Ins(1,3,4,5)P4 5-phosphatase. These findings serve to confirm the previous estimate of Horstman, Takemura & Putney [(1988) J. Biol. Chem. 263, 15297-15303] for the intracellular concentrations of Ins(1,4,5)P3 in resting (2 microM) and agonist-stimulated (25 microM) AR4-2J cells. The implications of these findings for the physiological regulation of intracellular Ca2+ through this intracellular messenger are discussed.

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Selected References

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