Abstract
Although hydrogen sulfide (H2S) is generally thought of in terms of a poisonous gas, it is endogenously produced in the brain. Physiological concentrations of H2S selectively enhance NMDA receptor-mediated responses and alter the induction of hippocampal long-term potentiation (LTP). Here we use cystathionine beta-synthase (CBS) knock-out mice to clearly show that CBS produces endogenous H2S in the brain and that H2S production is greatly enhanced by the excitatory neurotransmitter l-glutamate, as well as by electrical stimulation. This increased CBS activity is regulated by a pathway involving Ca2+/calmodulin. In addition, LTP is altered in CBS knock-out mice. These observations suggest that H2S is produced by CBS in response to neuronal excitation and that it may regulate some aspects of synaptic activity.
MeSH Terms
Animals
Binding Sites/physiology
Brain Chemistry
COS Cells
Calcium/metabolism
Calmodulin/antagonists & inhibitors,metabolism
Cerebral Cortex/chemistry,metabolism
Cystathionine beta-Synthase/chemistry,deficiency,genetics
Cysteine/analysis
Dose-Response Relationship, Drug
Electric Stimulation
Enzyme Inhibitors/pharmacology
Glutamic Acid/metabolism,pharmacology
Hydrogen Sulfide/analysis,metabolism
In Vitro Techniques
Ionophores/pharmacology
Long-Term Potentiation/physiology
Mice
Mice, Knockout
Neurons/cytology,drug effects,metabolism
Precipitin Tests
Protein Binding/physiology
Signal Transduction/physiology
Synaptic Transmission/physiology
Transfection
Chemicals
Calmodulin
Enzyme Inhibitors
Ionophores
Glutamic Acid
Cystathionine beta-Synthase
Cysteine
Calcium
Hydrogen Sulfide
Authors & Affiliations
5 authors, click to expand affiliations / ORCID
Eto Ko
National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo 187-8551, Japan.
Ogasawara Miki
Umemura Ken
Nagai Yasuo
Kimura Hideo
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