Insulin-dependent production of low-molecular-weight compounds that modify key enzymes in metabolism.
The mechanism by which the metabolic effects of insulin are transmitted is yet to be resolved. Second messengers mediating the action of insulin have been proposed and recently an insulin-dependent, peptide-like, heat- and acid-stable substance (Mr approx. 1000-3000) released from plasma membranes has been described which regulates the activity of key enzymes such as pyruvate dehydrogenase by altering its state of phosphorylation. It has been suggested that this material is the elusive second messenger of insulin and its discovery, generation, properties, isolation and mode of action are reviewed.
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D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000378:metabolism; D000103:Acetyl-CoA Carboxylase / Q000378:metabolism; D000251:Adenosine Triphosphatases / Q000378:metabolism; D000262:Adenylyl Cyclases / Q000378:metabolism; D000818:Animals; D002462:Cell Membrane / Q000502:physiology; D004798:Enzymes / Q000378:metabolism*; D005952:Glucose-6-Phosphatase / Q000378:metabolism; D007328:Insulin / Q000502:physiology*; D008565:Membrane Proteins / Q000502:physiology*; D008970:Molecular Weight; D010447:Peptide Hydrolases / Q000502:physiology; D010455:Peptides / Q000502:physiology*; D010766:Phosphorylation; D011494:Protein Kinases / Q000378:metabolism; D011768:Pyruvate Dehydrogenase Complex / Q000378:metabolism; D014357:Trypsin / Q000502:physiology
D004798:Enzymes; D007328:Insulin; D008565:Membrane Proteins; D010455:Peptides; D011768:Pyruvate Dehydrogenase Complex; D011494:Protein Kinases; D005952:Glucose-6-Phosphatase; D015105:3',5'-Cyclic-AMP Phosphodiesterases; D010447:Peptide Hydrolases; D014357:Trypsin; D000251:Adenosine Triphosphatases; D000262:Adenylyl Cyclases; D000103:Acetyl-CoA Carboxylase