GLP-1R signaling in the brain exerts antidepressive effects by improving cognitive processes, promoting neuroprotection and neurotransmitter release Patients suffering from depression are characterized by impaired neuronal activity and synaptic plasticity dysfunction, resulting in volumetric changes in brain regions which regulate emotions or the stress response such as the hippocampus and the prefrontal cortex
Less-selective compounds in the same class (GHRP-2, GHRP-6, hexarelin) cross-activate other endocrine axes alongside GH, which makes them noisier reference tools when researchers want to isolate ghrelin-pathway signalling from confounding hormonal effects
When AMPK is activated, cells increase glucose uptake independent of insulin, enhance fatty acid oxidation in mitochondria, and upregulate mitochondrial biogenesis
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