Major Chemical Classes of Endocrine Hormones
Hormone Type | Means of Production | Site of Receptor Population | Structure in Different Species |
|---|---|---|---|
Protein and polypeptide hormones (eg, ACTH, insulin) | Gene transcription/translation | Cell surface | Variable (some identical, some not) |
Steroid hormones (eg, estrogen, cortisol) | Conversion from cholesterol | Intracellular | Identical |
Modified amino acid hormones (eg, thyroxine, catecholamines) | Modification of tyrosine | Intracellular (thyroxine) and cell surface (catecholamines) | Identical |