Source comparison
Comparison: PT-141 Downstream Effects vs Direct Mechanism
Melanocortin receptor activation PT-141 binds MC4R, activates Gs protein and cAMP signaling CREB phosphorylation triggers transcriptional upregulation of eNOS and other genes Transcription continues 6–12 hours beyond receptor dissociation Explains prolonged NO
This comparison does not assign a generated winner or score.
- Melanocortin receptor activation
- PT-141 binds MC4R, activates Gs protein and cAMP signaling
- CREB phosphorylation triggers transcriptional upregulation of eNOS and other genes
- Transcription continues 6–12 hours beyond receptor dissociation
- Explains prolonged NO availability and vascular effects
- Nitric oxide release
- Initial NO synthesis from baseline eNOS enzyme levels
- eNOS upregulation produces sustained NO synthesis independent of receptor occupancy
- 6–12 hours beyond peptide clearance
- Primary driver of erectile and vasocongestion effects
- Dopamine release
- Acute dopamine surge in nucleus accumbens and VTA
- D2 receptor upregulation in striatum and prefrontal cortex
- 24–72 hours beyond peptide clearance
- Accounts for residual mood and motivation effects
- Blood pressure elevation
- Sympathetic activation via hypothalamic MC4R signaling
- Sustained catecholamine release from adrenal medulla
- Resolves 12–24 hours post-dose, slower in hypertensive patients
- Most clinically significant adverse event; contraindication in uncontrolled hypertension
- Nausea and flushing
- Direct MC4R activation in brainstem emetic centres
- Autonomic recalibration and histamine release from mast cells
- Peaks 1–4 hours, resolves 6–12 hours
- Most common adverse event (40–50% incidence in trials)