Table 42-1.
| Table 42-1. Substances that modulate GnRH secretion. | ||
| GnRH Modulator | Type of Feedback | Examples |
| Opioids | Negative/inhibitory | β-Endorphin |
| Catecholamines | Variable | Dopamine |
| Peptide hormones | Negative/inhibitory | FSH, LH |
| Sex steroids | Negative/inhibitory | Testosterone |
| Prostaglandins | Positive/stimulatory | PGE2 |
| FSH, follicle-stimulating hormone; LH, luteinizing hormone; PGE2, prostaglandin E2. | ||