ArticleEMBO molecular medicine2026
Inhibition of PGC1β-dependent mitochondrial biogenesis enhances EGFR-targeted therapy in lung cancer.
Article in EMBO molecular medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Third-generation EGFR tyrosine kinase inhibitors (EGFR-TKIs), including osimertinib, show robust clinical efficacy in EGFR-mutant (EGFRm) non-small cell lung cancer (NSCLC), yet acquired resistance remains inevitable. Here, we demonstrate that osimertinib and other EGFR-TKIs suppress PPARGC1B expression and its regulated mitochondrial biogenesis in EGFRm NSCLC cells through a previously unrecognized FOSL1/AP-1-mediated transactivation mechanism. Upon acquisition of osimertinib resistance, PPARGC1B expression and its encoded protein PGC1β rebound and become refractory to osimertinib-mediated suppression. Enforced overexpression of PPARGC1B confers resistance to osimertinib in sensitive EGFRm NSCLC cells, whereas PPARGC1B knockdown restores drug sensitivity in resistant cells. Moreover, combining osimertinib with the mitochondria-targeting agent CPI-613 synergistically suppresses mitochondrial biogenesis, induces apoptosis, and inhibits the growth of osimertinib-resistant cells and tumors. Collectively, these findings identify PGC1β-dependent mitochondrial biogenesis as a critical determinant of therapeutic response to osimertinib and suggest co-targeting mitochondrial metabolism as a potential strategy to overcome acquired resistance in EGFRm NSCLC.
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