Actions and Consequences of Insulin in the Striatum.
Level 5 - mechanism / opinion, no new human data
Narrative review of mechanistic and preclinical research without new human clinical data.
PubMed 36979453 · doi:10.3390/biom13030518
What was done
This narrative review summarizes literature regarding the cellular actions and behavioral consequences of insulin in the striatum, focusing on insulin receptor localization, dopamine modulation, and reward-related behavior.
What was found
No quantitative data or statistical effect sizes are reported in the abstract. Qualitatively, insulin acts on striatal insulin receptors across interneurons, projection neurons, glial cells, and dopamine axons. It promotes stimulated dopamine release via cholinergic interneurons and nicotinic acetylcholine receptors, increases dopamine uptake directly at dopamine axons, and is required for the development of flavor-nutrient learning.
Why it matters
This work delineates how peripheral metabolic signals interface with striatal reward circuitry to regulate dopamine dynamics and nutritional learning.
Limits
As a narrative review, it lacks systematic search methodology, meta-analytic data, and quality assessments. The summarized mechanisms derive primarily from preclinical and cellular models, limiting direct translation to human clinical outcomes without further empirical trials.
Cited by
- supports All cells inside the brain possess both glucose receptors and insulin receptors.