A patient with obesity is evaluating anti-obesity pharmacotherapies that act on hypothalamic arcuate nucleus neurocircuitry to regulate appetite and energy balance. Compare the central molecular mechanisms of action of Contrave (Naltrexone SR / Bupropion SR) and Ozempic (Semaglutide). How do these two therapies fundamentally differ in how they modulate anorexigenic POMC signalling and orexigenic NPY/AgRP neuronal populations?

Question

Accepted Answer

Contrave directly stimulates POMC neurons via Bupropion while using Naltrexone to block β-endorphin autoinhibitory feedback at µ-opioid receptors; in contrast, Ozempic directly activates POMC neurons while indirectly suppressing NPY/AgRP neurons via GABAergic interneurons.

✅

Answer

Contrave selectively antagonizes postsynaptic MC4 receptors to prevent α-MSH degradation in the paraventricular nucleus; in contrast, Ozempic directly ablates NPY/AgRP cell bodies in the arcuate nucleus to eliminate baseline orexigenic tone.

❌

Answer

Contrave directly excites orexigenic NPY/AgRP neurons while blocking leptin clearance; in contrast, Ozempic acts exclusively via peripheral vagal afferent fibres without directly. penetrating or binding receptors within hypothalamic centres.

❌

Answer

Contrave acts non-systemically in the lumen of the small intestine to block dietary lipid hydrolysis; in contrast, Ozempic crosses the blood-brain barrier to competitively inhibit central dopamine reuptake transporters in reward pathways.

❌

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