抄録
DeFronzo’s Ominous Octet established type 2 diabetes as a multisystem disorder involving pancreatic β-cells, skeletal muscle, the liver, adipose tissue, pancreatic α-cells, the gastrointestinal tract, the kidneys, and the brain. However, a common upstream mechanism capable of linking dysfunction across these anatomically and functionally distinct organs remains incompletely understood. Here, we propose that reactive aldehydes may constitute a “Hidden Ninth Player” that mechanistically connects the eight components of the Ominous Octet.
We first reframe glycative stress from a predominantly chronic process characterized by advanced glycation end-product accumulation to a dynamic imbalance between reactive aldehyde generation and endogenous detoxification capacity. Human studies have demonstrated rapid increases in methylglyoxal, glyoxal, and 3-deoxyglucosone following glucose loading, occurring approximately in parallel with the rise in plasma glucose. To explain this rapid response, we propose the “Aldehyde Spark” hypothesis: postprandial metabolic loading induces a transient, coordinated increase in multiple reactive aldehydes through changes in open-chain glucose equilibrium, increased glycolytic flux, glucose-derived carbonyl formation, and, particularly under lipid overload, lipid peroxidation-derived aldehydes.
When aldehyde generation exceeds defense systems involving glyoxalase, aldehyde dehydrogenase, alcohol dehydrogenase, glutathione, and NAD -dependent metabolism, reactive aldehydes may initiate a self-amplifying network of protein, lipid, and nucleic acid modification, mitochondrial dysfunction, ATP depletion, disturbed Ca² homeostasis, endoplasmic reticulum stress, impaired protein quality control, and chronic inflammation. These processes may manifest differently according to the vulnerability and physiological function of each organ or tissue comprising the Ominous Octet.
We therefore propose that the eight components are not merely independent organ-specific abnormalities, but may represent distinct phenotypic manifestations of a shared, repeatedly occurring chemical stress. The Aldehyde Spark–Hidden Ninth Player framework provides a testable hypothesis linking postprandial metabolic overload to multisystem dysfunction in type 2 diabetes and may offer a new perspective for prevention and therapeutic intervention.
