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A system to select for mutant LLC-PK1 cells affected in cAMP mediated hormonal response using a photoactivatable analogue of vasopressin

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Luzius,  Heike
Emeritusgroup Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Jans,  David A.
Emeritusgroup Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Fahrenholz,  Falk
Emeritusgroup Physical Chemistry, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Luzius, H., Jans, D. A., & Fahrenholz, F. (1990). A system to select for mutant LLC-PK1 cells affected in cAMP mediated hormonal response using a photoactivatable analogue of vasopressin. Journal of Receptors and Signal Transduction, 10(1-2), 61-80. doi:10.3109/10799899009064658.


Cite as: http://hdl.handle.net/21.11116/0000-0007-EB39-1
Abstract
The photoreactive analogue of vasopressin, [1-(3-mercapto)propionic acid, 8-(N6-4-azidophenyl-amidino)lysine] vasopressin (apa-LVP) could be used to elicit stimulation of cAMP production in LLC-PK renal epithelial cells, detectable up to 24 h after photoactivation by flash photolysis. This is in contrast to cells treated with vasopressin, or apa-LVP without photoactivation, where cAMP synthesis is down regulated within 4 h. The prolonged stimulation of cAMP production induced by photoactivation of apa-LVP was demonstrated to be cytotoxic to LLC-PK1 cells, whereas the vasopressin receptor negative LLC-PK1 mutant M18 was resistant to the cytotoxic effect. A selection strategy was developed for mutants resistant to this long-term stimulation of cAMP production, whereby multiple cycles of treatment with apa-LVP and photoactivation were used. Mutants so selected were then characterized using a novel screening system for detection of the production of urokinase-type plasminogen activator in response to cAMP agonists. One mutant was examined and found to be impaired in hormonal responsiveness, whereby hormone and forskolin stimulated cAMP-mediated responses were markedly reduced. It exhibited resistance to the long-term stimulation of cAMP production elicited by apa-LVP and photoactivation. This implies that apa-LVP can be used to select for novel mutants specifically impaired in cAMP metabolism and in particular down-regulation of cAMP response.