alexa Ca2+ influx evoked by inositol-3,4,5,6-tetrakisphosphate in ras-transformed NIH 3T3 fibroblasts.
Biomedical Sciences

Biomedical Sciences

Journal of Bioengineering & Biomedical Science

Author(s): Hashii M, Hirata M, Ozaki S, Nozawa Y, Higashida H

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Abstract Infusion of inositol-3,4,5,6-tetrakisphosphate (Ins(3,4,5,6)P4) from the patch pipette into the cytoplasm, produced a biphasic intracellular free Ca2+ concentration ([Ca2+]i) increase in ras-transformed NIH/3T3 (DT) cells. The Ins(3,4,5,6)P4-induced increase in DT cells depended upon extracellular Ca2+, and was enhanced by membrane hyperpolarization. Identical [Ca2+]i increases were observed with intracellular application of inositol-1,3,4,5-tetrakisphosphate (Ins(1,3,4,5)P4) and inositol-1,3,4,6-tetrakisphosphate but not with inositol-1,2,4,5-tetrakisphosphate, inositol-1,4,5-trisphosphate or inositol-1,3,4,5,6-pentakisphosphate. Stimulation of DT cells with bradykinin increased the levels of Ins(3,4,5,6)P4 and Ins(1,3,4,5)P4. These results suggest that Ins(3,4,5,6)P4 may serve as a second messenger for continuous Ca2+ influx along with other tetrakisphosphates downstream from bradykinin receptors in DT cells.
This article was published in FEBS Lett and referenced in Journal of Bioengineering & Biomedical Science

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