Dopamine: Understanding Its Synthesis, Receptors, and Influence on Neurological Functions

Abstract Dopamine, an essential monoamine neurotransmitter and hormone, is central to many neurological functions. It is primarily produced in the substantia nigra, ventral tegmental area, and hypothalamus of the brain. The structure of dopamine, which includes a catechol structure and an amine group, is synthesized through a two-step process. Dopamine functions via G-protein coupled receptor signalling and is involved in the regulation of motor functions, motivation, and reward-associated learning. Dopamine receptors, belonging to the class of G protein-coupled receptors, are significant in the vertebrate central nervous system. These receptors include at least five subtypes: D1, D2, D3, D4, and D5. Each subtype has a unique function and is located in different areas. They play a critical role in many neurological processes, including motivational and incentive salience, cognition, memory, learning, and fine motor control. . Abnormalities in dopamine receptor signalling and dopaminergic nerve function are implicated in several neuropsychiatric disorders. The D1 dopamine receptor is involved in the regulation of functions such as motor behaviour, reward, motivational states, and cognitive processes. The D2 dopamine receptor regulates the release of dopamine and is associated with several neurological disorders such as schizophrenia, bipolar disorder, Parkinson’s disease, Alzheimer’s disease, and attention-deficit/hyperactivity disorder.