Nucleus: DNA and RNA synthesis
Cytoplasm: Glycolysis, hexose monophosphate (HMP) shunt, fatty acid synthesis
Mitochondria: Tricarboxylic acid (TCA) cycle, fatty acid oxidation, pyruvate decarboxylation
Intracellular: Thyroid hormone, steroids, and vitamin D
Ligand gated ion channel: Nicotine, gamma-aminobutyric acid (GABA), and glycine
Tyrosine kinase linked: Insulin
Adenylate cyclase linked: Epinephrine, alpha-2 and beta receptors
Phosphatidyl-inositol linked: Alpha-1 receptors and growth hormone
Examples:Adenylate cyclase and phosphatidyl-inositol linked receptors
Mechanism: The alpha subunit of G proteins activates protein kinase G.Protein kinase G synthesis is stimulated by the short-acting nitric oxide; however, they are always short acting due to the inhibitory effect of guanosine triphosphatase (GTPase).
Note:Nitroglycerin, sodium nitroprusside, interleukin-1, and tumor necrosis...