Abstract
We have used the cystic fibrosis transmembrane conductance regulator (CFTR) Cl- channel as a model system to study the cAMP signal transduction pathways coupled to the Xenopus melatonin receptor. During forskolin (Fsk) stimulation, melatonin reduced the amplitude of the CFTR currents in oocytes injected with in vitro transcribed cRNAs for the Xenopus melatonin receptor and CFTR. Pertussis toxin (Ptx) treatment eliminated melatonin inhibition of Fsk stimulated CFTR currents. In oocytes injected with cRNA for melatonin receptors, serotonin receptors (5-HT7), and CFTR Cl- channels, application of melatonin together with serotonin (5-HT) activated an additional inward current showing potentiation of adenylyl cyclases by melatonin receptors. Subthreshold activation of 5-HT7 receptors was sufficient and necessary to permit activation of CFTR channels by melatonin. Preexposure to melatonin desensitized the melatonin receptor mediated response. Therefore, based on this model system, the effects of melatonin in vivo could be either positive or negative modulation of other neuronal inputs, depending on the mode of adenylyl cyclase stimulation.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 113-121 |
| Number of pages | 9 |
| Journal | Journal of Pineal Research |
| Volume | 26 |
| Issue number | 2 |
| State | Published - 1999 |
Fingerprint
Keywords
- 5-HT receptor
- CFTR
- Melatonin
- Melatonin receptor
- Oocyte
- Serotonin
ASJC Scopus subject areas
- Endocrinology
Cite this
Melatonin receptor potentiation of cyclic AMP and the cystic fibrosis transmembrane conductance regulator ion channel. / Nelson, Cole S.; Marino, Jennifer L.; Allen, Charles.
In: Journal of Pineal Research, Vol. 26, No. 2, 1999, p. 113-121.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Melatonin receptor potentiation of cyclic AMP and the cystic fibrosis transmembrane conductance regulator ion channel
AU - Nelson, Cole S.
AU - Marino, Jennifer L.
AU - Allen, Charles
PY - 1999
Y1 - 1999
N2 - We have used the cystic fibrosis transmembrane conductance regulator (CFTR) Cl- channel as a model system to study the cAMP signal transduction pathways coupled to the Xenopus melatonin receptor. During forskolin (Fsk) stimulation, melatonin reduced the amplitude of the CFTR currents in oocytes injected with in vitro transcribed cRNAs for the Xenopus melatonin receptor and CFTR. Pertussis toxin (Ptx) treatment eliminated melatonin inhibition of Fsk stimulated CFTR currents. In oocytes injected with cRNA for melatonin receptors, serotonin receptors (5-HT7), and CFTR Cl- channels, application of melatonin together with serotonin (5-HT) activated an additional inward current showing potentiation of adenylyl cyclases by melatonin receptors. Subthreshold activation of 5-HT7 receptors was sufficient and necessary to permit activation of CFTR channels by melatonin. Preexposure to melatonin desensitized the melatonin receptor mediated response. Therefore, based on this model system, the effects of melatonin in vivo could be either positive or negative modulation of other neuronal inputs, depending on the mode of adenylyl cyclase stimulation.
AB - We have used the cystic fibrosis transmembrane conductance regulator (CFTR) Cl- channel as a model system to study the cAMP signal transduction pathways coupled to the Xenopus melatonin receptor. During forskolin (Fsk) stimulation, melatonin reduced the amplitude of the CFTR currents in oocytes injected with in vitro transcribed cRNAs for the Xenopus melatonin receptor and CFTR. Pertussis toxin (Ptx) treatment eliminated melatonin inhibition of Fsk stimulated CFTR currents. In oocytes injected with cRNA for melatonin receptors, serotonin receptors (5-HT7), and CFTR Cl- channels, application of melatonin together with serotonin (5-HT) activated an additional inward current showing potentiation of adenylyl cyclases by melatonin receptors. Subthreshold activation of 5-HT7 receptors was sufficient and necessary to permit activation of CFTR channels by melatonin. Preexposure to melatonin desensitized the melatonin receptor mediated response. Therefore, based on this model system, the effects of melatonin in vivo could be either positive or negative modulation of other neuronal inputs, depending on the mode of adenylyl cyclase stimulation.
KW - 5-HT receptor
KW - CFTR
KW - Melatonin
KW - Melatonin receptor
KW - Oocyte
KW - Serotonin
UR - http://www.scopus.com/inward/record.url?scp=0033055964&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033055964&partnerID=8YFLogxK
M3 - Article
VL - 26
SP - 113
EP - 121
JO - Journal of Pineal Research
JF - Journal of Pineal Research
SN - 0742-3098
IS - 2
ER -