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| Content Provider | PubMed Central |
|---|---|
| Author | Hashii, M. Nakashima, S. Yokoyama, S. Enomoto, K. Minabe, Y. Nozawa, Y. Higashida, H. |
| Abstract | Signal transduction from mouse bradykinin B2 receptors to calcium influx was studied in ras-transformed NIH/3T3 (DT) fibroblasts. DT cells were preloaded with fura-2 and whole-cell voltage-clamped. Activation of B2 receptors resulted in a decrease of cellular fluorescence at the excitation wavelength of 340, or 360 nm after MnCl2 application, in both the presence and absence of external Ca2+ in DT cells, at a holding potential of -40 mV. This Mn2+ entry through the Ca2+ influx pathway increased with membrane hyperpolarization. Internal application of inositol 1,3,4,5-tetrakisphosphate (InsP4), but not of inositol 1,4,5-trisphosphate, mimicked membrane potential-dependent Mn2+ entry. Bradykinin- and InsP4-induced Ca2+ influx was blocked by 10-100 microM genistein, a tyrosine kinase inhibitor. B2 receptor activation induced time-dependent tyrosine phosphorylation of mitogen-activated protein kinase and 120 kDa protein, which was dose-dependently inhibited by genistein. Bradykinin was unable to induce Ca2+ oscillations in genistein-treated DT cells. Our results show that bradykinin-induced Ca2+ influx and oscillations depend upon protein tyrosine phosphorylation. The results suggest that two bradykinin B2 receptor-activated signal pathways, protein tyrosine phosphorylation and formation of InsP4, merge at the Ca2+ influx process in ras-transformed NIH/3T3 fibroblasts. |
| Starting Page | 649 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | Pt 2 |
| Volume Number | 319 |
| Language | English |
| Publisher Date | 1996-10-15 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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