Intraneuronal Guanylyl-imidodiphosphate Injection Mimics Long-term Synaptic Hyperpolarization in Aplysia
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The phosphodiesterase (3':5'-cyclic AMP 5'-nucleotidohydrolase, EC 3.1.4.17) inhibitor thepohylline enhances both the amplitude and duration of a long-lasting synaptic hyperpolarization in identified neuron R15 in Aplysia californica. Intraneuronal injection into R15 of glanylyl-imidodiphosphate, an adenylate cyclase [ATP pyrophosphate-lyase (cyclizing), EC 4.6.1.1] activator, results in a deep and long-lasting hyperpolarization of the cell, similar to that produced by synaptic stimulation. Biochemical analysis confirms that guanylyl-imidodiphosphate activates adenylate cyclase in Aplysia californica nervous tissue, without affecting phosphodiesterase activity. These observations suggest that adenosine 3':5'-cyclic monophosphate plays a role in long-lasting synaptic inhibition and are consistent with a post-synaptic site of action for adenosine 3':5'-cyclic monophosphate.
Bolshakov VYu , Gapon S, Katchman A, Magazanik L J Physiol. 1993; 468:11-33.
PMID: 7902868 PMC: 1143812. DOI: 10.1113/jphysiol.1993.sp019757.
Lemos J, Levitan I J Gen Physiol. 1984; 83(2):269-85.
PMID: 6325583 PMC: 2215624. DOI: 10.1085/jgp.83.2.269.
Serotonin-induced hyperpolarization of an indentified Aplysia neuron is mediated by cyclic AMP.
Drummond A, Benson J, Levitan I Proc Natl Acad Sci U S A. 1980; 77(8):5013-7.
PMID: 6254053 PMC: 349980. DOI: 10.1073/pnas.77.8.5013.
Pellmar T Br J Pharmacol. 1981; 74(4):747-56.
PMID: 6171322 PMC: 2071902. DOI: 10.1111/j.1476-5381.1981.tb10707.x.
A molecular description of nerve terminal function.
Reichardt L, Kelly R Annu Rev Biochem. 1983; 52:871-926.
PMID: 6137190 PMC: 2762394. DOI: 10.1146/annurev.bi.52.070183.004255.