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Research Article: Hsp70 regulates CD24 expression and promotes metastasis and invasion of lung cancer via the MAPK/ERK signaling pathway

Date Published: 2025-10-21

Abstract:
To investigate the effects and mechanisms of Hsp70-mediated regulation of CD24 expression on the invasion and metastasis of lung cancer. Protein-protein interactions between Hsp70 and CD24 were analyzed by co-immunoprecipitation and immunofluorescence. Lentiviral-mediated Hsp70 knockdown and CD24 overexpression were validated using RT-qPCR and Western blotting. Functional consequences were assessed through CCK-8 proliferation assays, colony formation, wound healing, Transwell migration/invasion, and angiogenesis assays. In vivo metastatic potential was evaluated using a tail vein injection model in nude mice. Hsp70 and CD24 demonstrated interaction through co-precipitation. Knockdown of Hsp70 significantly attenuated CD24 expression (p<0.01), whereas CD24 overexpression did not alter Hsp70 levels. Phenotypically, Hsp70 suppression impaired cellular proliferation, migration, invasion and angiogenic capacity, while CD24 overexpression potentiated these oncogenic properties. Both manipulations modulated ERK1/2, MEK, Raf and Ras phosphorylation status. Hsp70 upregulates CD24 expression and activates downstream MAPK/ERK signaling, thereby enhancing the metastatic and invasive capacity of lung cancer.

Introduction:
Lung cancer remains one of the most prevalent malignancies worldwide, representing a significant global health burden. Epidemiological data reveal it as the predominant cause of cancer-related mortality in males and the second leading cause in females, surpassed only by breast carcinoma ( 1 ). Although diagnostic and therapeutic modalities have advanced considerably in recent years, the prognosis for patients with advanced or metastatic disease remains dismal, demonstrating a 5-year survival rate of merely 15-30%…

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