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Chemical Classes of Hormones

Chemical Classes of Hormones - Endocrine System Chemical...

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Endocrine System Chemical Classes of Hormones Water –soluble Hormones * Monoamine (biogenic amines) hormones- synthesized by modifying certain amino acids * Catecholamines- (made from tyrosine) epinephrine, norepinephrine, and dopamine * Histamine- from histadine by mast cells and platelets * Serotonin and melatonin- from tryptophan * Peptide and protein hormones- synthesized on the rough ER and consist of chains 3-200 amino acids * Ex: Thyroid-stimulating hormone (TSH) Chemical Classes of Hormones Eicosanoid hormones- chemical mediators derived from arachidonic acid (a 20-carbon fatty acid) located in the phospholipids in the plasma membrane * leukotrienes- mediates allergic reactions * derived from the enzyme lipoxygenase action on arachidonic acid cyclooxygenase converts arachidonic acid to three other types of eicosanoids * Prostacyclin- produced by the walls of blood vessels, where it inhibits blood clotting and vasoconstriction * Thromboxanes- produced by blood platelets *
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