Finding. Crabtree and Warburg are not two names for the same sugar habit. Duraj, Seyfried and colleagues put syngeneic mouse cells on the same bench: resting and dividing thioglycollate macrophages, VM-M3 glioma cells that still look macrophage-like, and CT-2A astrocytoma. The malignant proliferators share one primary bioenergetic mark: oxidative phosphorylation is insufficient. Macrophages still own a Crabtree effect. Give them glucose and time, and OxPhos falls, substrate-level phosphorylation pays the ATP bill, and mitochondrial inhibitors bounce off. Drop the glucose or swap in respiratory fuels and OxPhos and inhibitor sensitivity come back. The tumor cells, under the same glucose-replete conditions, stay on substrate-level phosphorylation. That lock is the Warburg effect in this paper. Non-tumor cells can proliferate on OxPhos without going Warburg. Dysregulated proliferation is also metabolically inflexible when nutrients move. The methods sentence is the other finding: only long experiments that keep ATP sufficient at steady state are allowed into the comparison.
Why this paper matters
Cancer-metabolism Twitter still treats "Warburg" as aerobic glycolysis and "Crabtree" as a yeast footnote. This preprint forces a matched-cell, matched-glucose test. Transient, reversible OxPhos suppression in a normal immune cell is not the same object as persistent OxPhos failure in a glioma. If your mitochondrial-inhibitor screen dies in high glucose, you may be looking at Crabtree, not at a drug-resistant Warburg tumor.
It also restates a Seyfried-adjacent thesis with controls: OxPhos insufficiency as the malignant hallmark, and OxPhos as sufficient for regulated non-tumor growth. You do not have to join a metabolic-theory camp to steal the experimental split.
What they actually measured
Three cell identities, two growth states, glucose versus respiratory fuels, mitochondrial-inhibitor sensitivity, and a demand for steady-state ATP sufficiency. Flexibility under nutrient stress is scored against growth arrest and regulated proliferation. The abstract does not hand you a named Complex lesion.
How to read the score
Low 90s. Core OxPhos question, clean Crabtree/Warburg distinction, usable methods rule. Confidence is high for this mouse set.
Caveats
Mouse glioma lines from one intellectual lineage. Human tumors may mix Crabtree-like and Warburg-like cells in one mass. ATP sufficiency as a gate is a feature; it will exclude short Seahorse snapshots some readers still want.
What to do with it
If you compare immune and tumor bioenergetics, copy the syngeneic design and the glucose-down / respiratory-fuel rescue. If a mitochondrial inhibitor "fails" in 25 mM glucose, repeat the assay at Crabtree-off conditions before you retire the compound. Do not cite this brief as a human ketogenic-therapy trial.