Abstract
Synaptic transmission is both, an essential process in the functioning of our brain and the most important site for plastic changes, at least in the short and medium term.
There are many endogenous substances that act at (chemical) synapses. Quantitatively, by far the most important ones are the transmitters glutamate, GABA, and acetylcholine. Together with glycine, some agonists at purinergic, TRP-like receptors and one type of monoamine transmitter receptor, they are in charge of rapid, precise, and localized transmission via ionotropic receptors. The transmitters mentioned and all others act on metabotropic receptors generating slower, but long-lasting, versatile, and amplified responses. Further, there are substances that influence synaptic transmission, but are not stored in synaptic vesicles, such as retrograde messengers.
Neuropharmacology, to a large part, is the science of interaction between ligands and transmitter receptors. The majority of mental pathologies have to do with imbalances and/or malfunctioning of transmitter systems.
It is worthwhile, therefore, for professionals interested in neuroscience to have a thorough knowledge of the principal transmitter systems.
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Notes
- 1.
The British scientist Sir Henry H. Dale stated in 1936 that a neuron can be either cholinergic or adrenergic but does never release both transmitters.
- 2.
Derived from the Greek (F)εργον (“vergon” = work; the “F” is an ancient letter that later got omitted resulting in “εργον”)
- 3.
There are about 5 times more glutamatergic than GABAergic neurons at least in the neocortex of mice (Sahara et al. 2012).
- 4.
Other tissues or organ systems are also plastic (e.g., your heart is trained by exercise).
- 5.
Contrary to a widespread confusion, “memory” itself is not a process, but rather is defined by processes (such as storing and retrieving data).
- 6.
Steroid receptors are situated in the cell plasma, rather than inserted in the cellular membrane. When activated they bind to nuclear DNA and interfere with gene expression.
- 7.
Therapeutic window is the range of doses used clinically that have a therapeutic effect without too many undesired collateral effects.
- 8.
“coeruleus (Latin) means “heavenly blue.”
- 9.
Dopamine, noradrenaline, and adrenaline are called catecholamines, because chemically they can be considered as derived from catechol (a benzene ring with two OH-groups attached in position “ortho” = next to each other.
- 10.
The term “cytokines” refers to signaling peptides released mainly by immunoactive cells.
- 11.
Firmly established since 2013 and recognized by IUPHAR (International Union of Basic and Clinical Pharmacology).
- 12.
T-cells are part of the immune system.
- 13.
“Hemopoietic” means “blood-making” and refers to tissue inside the bones.
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Zeise, M.L., Morales, B. (2021). The Transmitters. In: Zeise, M.L. (eds) Neuroscience for Psychologists. Springer, Cham. https://doi.org/10.1007/978-3-030-47645-8_4
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