Summary
Sea anemone toxin II (ATX II) and MCD-peptide, like other depolarizing agents, raise the content of cGMP and to a lesser extent of cAMP in mouse cerebellar slices. Na+ influx and Ca2+ movement are involved in their mode of action, as indicated by the following observations:
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1.
The rise of cGMP due to ATX II, MCD-peptide and high potassium was diminished when Na+ had been replaced by Li+.
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2.
The effects of both toxins and veratridine, but not of high potassium stimulation were prevented by tetrodotoxin (TTX).
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3.
The cGMP accumulation due to both toxins was abolished in the absence of extracellular Ca2+.
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4.
The so-called Ca2+-antagonist (−)-D-600 blocked the increase of cGMP due to ATX II, MCD-peptide, veratridine and high potassium.
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5.
ATX II stimulated the 45Ca2+ uptake in mouse cerebellar slices which was prevented by TTX and (−)-D-600.
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Abbreviations
- cAMP:
-
3′, 5′-cyclic-adenosine monophosphate
- cGMP:
-
3′, 5′-cyclic-guanosine monophosphate
- ATX II:
-
sea anemone toxin II
- TTX:
-
tetrodotoxin
- MCD-peptide:
-
mast cell degranulating peptide
- ADA:
-
adenosine desaminase
- D-600:
-
3-methoxy verapamil
- IBMX:
-
isobutyl methyl xanthine
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Ahnert, G., Glossmann, H. & Habermann, E. Investigations on the mechanism of cyclic guanosine monophosphate increase due to depolarizing agents as studied with sea anemone toxin II in mouse cerebellar slices. Naunyn-Schmiedeberg's Arch. Pharmacol. 307, 159–166 (1979). https://doi.org/10.1007/BF00498458
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DOI: https://doi.org/10.1007/BF00498458