Insulin Sensitivity Neural refers to the specific responsiveness of neurons and glial cells in the central nervous system to the hormone insulin, which acts as a neurotrophic and neuromodulatory agent in the brain. Unlike its primary peripheral role in glucose uptake, brain insulin signaling is crucial for synaptic plasticity, memory formation, and the regulation of appetite and energy homeostasis. Optimal neural insulin sensitivity is essential for preventing cognitive decline and maintaining a healthy metabolic state.
Origin
This is an advanced concept emerging from neuroendocrinology, recognizing that the brain is not an insulin-independent organ but rather a key target tissue for insulin action. The term ‘neural’ differentiates this function from the more commonly understood peripheral, muscle, and adipose tissue insulin sensitivity. Research increasingly links neural insulin resistance to neurodegenerative disorders.
Mechanism
Insulin receptors are highly expressed in brain regions vital for cognition, such as the hippocampus and hypothalamus. Upon binding to its receptor, insulin activates intracellular signaling pathways that modulate the expression of genes involved in synaptic transmission and neuronal survival. Furthermore, central insulin signaling plays a critical role in regulating peripheral glucose metabolism and energy expenditure via the autonomic nervous system, highlighting a powerful brain-body metabolic loop.
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