GLP-1 is a Satiety Hormone | Part 6 Neurobiology of Food Intake | Macronutrients Lecture 42

Описание: GLP-1 is secreted by intestinal cells in response to glucose ingestion and acts on the vagus nerve and hypothalamus to induce satiety. Subscribe to Nourishable at    / nourishable  

This video is part 6 of the Neurobiology of Food Intake module within a lecture series on the nutrition science of macronutrients.


Neurobiology of Food Intake Lecture playlist:    • Neurobiology of Food Intake  

Macronutrients Lecture playlist:    • Macronutrients Lectures  

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The information in this video is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images and information, contained on or available through this video is for general information purposes only.

References
Klockars, A. et al. Hypothalamic Integration of the Endocrine Signaling Related to Food Intake. Curr. Topics Behav. Neurosci. (2019) 43:239-270

Images
Figures created with BioRender

Glucagon-like peptide 1, or GLP-1, is a hormone secrets by the L cells in the intestine in response to glucose ingestion in proportion to consumed calories. GLP-1 stimulates insulin secretion from the pancreas to prepare the body for high blood glucose levels - this makes it an incretin because it increases insulin. Further, GLP-1 inhibits glucagon. GLP-1 binds to chemoreceptors on the vagus nerve to activate the vagus to send afferent signals to stimulate the nucleus tractus solitarius in the hindbrain to stimulate satiety. GLP slows gastric emptying which keeps the GI tract stretched and distended for longer - this activates the stretch-sensitive mechanoreceptors on the vagus to additionally stimulate the NTS. GLP-1 crosses the blood-brain-barrier of the hypothalamus to activate the POMC neurons in the arcuate nucleus. POMC neuron stimulation causes release of the neurotransmitter alpha MSH which stimulates the paraventricular hypothalamus to induce satiety. GLP-1 also inhibits the orexigenic AgRP neurons. GLP-1 is an anorexigenic, satiety-inducing hormone.