Role of the prostanoid FP receptor in action potential generation and phenotypic transformation of NRK fibroblasts
In: Cellular Signalling, Jg. 20 (2008-11-01), Heft 11, S. 2022-2029
academicJournal
Zugriff:
Abstract: By using an shRNA approach to knockdown the expression of the prostaglandin (PG)-F2α receptor (FP-R), the role of PGF2α in the process of phenotypic transformation of normal rat kidney (NRK) fibroblasts has been studied. Our data show that PGF2α up-regulates Cox-2 expression both at the mRNA and protein level, indicating that activation of FP-R in NRK fibroblasts induces a positive feedback loop in the production PGF2α. Knockdown of FP-R expression fully impaired the ability of PGF2α to induce a calcium response and subsequent depolarization in NRK cells. However, these cells could still undergo phenotypic transformation when treated with a combination of EGF and retinoic acid, but in contrast to the wild-type cells, this process was not accompanied by a membrane depolarization to −20 mV. Knockdown of FP-R expression also impaired the spontaneous firing of calcium action potentials by density-arrested NRK cells. These data show that a membrane depolarization is not a prerequisite for the acquisition of a transformed phenotype. Furthermore, our data provide the first direct evidence that activity of PGF2α by putative pacemaker cells underlies the generation of calcium action potentials in NRK monolayers. [Copyright &y& Elsevier]
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Role of the prostanoid FP receptor in action potential generation and phenotypic transformation of NRK fibroblasts
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Autor/in / Beteiligte Person: | Almirza, W.H. ; Dernison, M.M. ; Peters, P.H.J. ; van Zoelen, E.J.J. ; Theuvenet, A.P.R. |
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Zeitschrift: | Cellular Signalling, Jg. 20 (2008-11-01), Heft 11, S. 2022-2029 |
Veröffentlichung: | 2008 |
Medientyp: | academicJournal |
ISSN: | 0898-6568 (print) |
DOI: | 10.1016/j.cellsig.2008.07.013 |
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