BRD4 Degradation Enhanced Glioma Sensitivity to Temozolomide by Regulating Notch1 via Glu‐Modified GSH‐Responsive Nanoparticles

Abstract Temozolomide (TMZ) serves as the principal chemotherapeutic agent for glioma; nonetheless, its therapeutic efficacy is compromised by the rapid emergence of drug resistance, the inadequate targeting of glioma cells, and significant systemic toxicity. ARV‐825 may play a role in modulating drug resistance by degrading the BRD4 protein, thereby exerting anti‐glioma effects. Therefore, to surmount TMZ resistance and achieve efficient and specific drug delivery, a dual‐targeted glutathione (GSH)‐responsive nanoparticle system (T+A@Glu‐NP) is designed and synthesized for the co‐delivery of ARV‐825 and TMZ. As anticipated, T+A@Glu‐NPs significantly enhanced penetration of the blood‐brain barrier (BBB), facilitated drug uptake by glioma cells, and exhibited efficient accumulation in brain tissue. Additionally, T+A@Glu‐NPs exhibited augmented efficacy against glioma both in vitro and in vivo through the induction of apoptosis, inhibition of proliferation, and cell cycle arrest. Furthermore, mechanistic exploration revealed that T+A@Glu‐NPs degraded the BRD4 protein, leading to the downregulation of Notch1 gene transcription and the inhibition of the Notch1 signaling pathway, thereby augmenting the therapeutic efficacy of glioma chemotherapy. Taken together, the findings suggest that T+A@Glu‐NPs represents a novel and promising therapeutic strategy for glioma chemotherapy.