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Quick answer
Easy Explanation of Endocrine Pharmacology & Anterior Pituitary Hormones
Based on the PDF, here's a simple breakdown with comparisons:
What Are Hormones?
Think of hormones as chemical messengers. Your body makes them in special glands, they travel through your blood, and they tell your cells what to do. They keep your body balanced and working smoothly.
How Hormones Work (3 Main Ways)
| Location | How It Works | Examples |
|---|---|---|
| Cell Membrane | Fast signal - uses cAMP or calcium | Adrenaline, insulin, growth hormone |
| Cytoplasm | Makes proteins inside the cell | Steroid hormones |
| Cell Nucleus | Changes DNA instructions for genes | Thyroid hormones |
Anterior Pituitary Hormones (The Main 5)
1. Growth Hormone (GH)
- Does what: Makes you grow, builds muscle and bone, helps your metabolism
- Too much: Gigantism (kids) or Acromegaly (adults - enlarged hands/face)
- Too little: Dwarfism (kids) or weak muscles (adults)
- Treatment: Somatotropin (synthetic GH) or octreotide (GH blocker)
2. Prolactin
- Does what: Makes milk in women after pregnancy
- Too much: Stops periods, kills sex drive, makes milk leak when not pregnant
- Treatment: Bromocriptine or Cabergoline (dopamine agonists that lower prolactin)
3. TSH (Thyroid Stimulating Hormone)
- Does what: Tells your thyroid to make T3 and T4 (thyroid hormones that control metabolism)
- Controlled by: TRH from the brain (turns it up) and thyroid hormones (turn it down - feedback loop)
- No direct use: Doctors measure TSH to diagnose thyroid problems but don't give it as treatment
4. Gonadotropins (FSH & LH)
- FSH (Follicle Stimulating Hormone):
- Girls: Makes eggs develop, produces estrogen
- Boys: Makes sperm
- LH (Luteinizing Hormone):
- Girls: Triggers ovulation, makes progesterone
- Boys: Makes testosterone
- Uses: Treat infertility, delay/trigger puberty
5. ACTH (Adrenocorticotropic Hormone)
- Does what: Tells your adrenal glands to make cortisol (stress hormone)
- Controlled by: CRH from brain + stress (overrides normal shutdown)
- Too much: Cushing's syndrome
- Too little: Weak adrenal glands
- Use: Mainly for testing, not treatment
Quick Comparison Table
| Hormone | Size | Type | Main Job | When Too High | When Too Low |
|---|---|---|---|---|---|
| GH | Medium peptide | Protein | Growth & metabolism | Acromegaly | Dwarfism |
| Prolactin | Medium peptide | Protein | Milk production | No periods + low sex drive | Weak lactation |
| TSH | Large glycoprotein | Protein + sugar | Activate thyroid | Hyperthyroidism | Hypothyroidism |
| FSH/LH | Glycoproteins | Protein + sugar | Sex & reproduction | Polycystic ovaries | Infertility |
| ACTH | Small peptide | Protein | Activate adrenals | Cushing's syndrome | Weak adrenals |
Key Takeaway
All these hormones work through a chain: Brain → Pituitary → Target Organ → Feedback Loop. When anything breaks in this chain, you get disease. Drugs either replace missing hormones, block excess hormones, or mimic natural signals to restore balance.
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