ArticleMedical oncology (Northwood, London, England)2025
Photodynamic therapy boosts the anti-proliferative activity of oxaliplatin in cervical cancer cells by regulating stemness-related genes.
Article in Medical oncology (Northwood, London, England), 2025. 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
Cervical cancer is the fourth most prevalent cancer among women worldwide and remains a significant contributor to cancer-related mortality, particularly in low- and middle-income countries, largely due to treatment resistance and disease recurrence. Growing evidence indicates that cancer stem cells (CSCs) play a pivotal role in tumor initiation, progression, and therapeutic resistance. Consequently, the development of novel therapeutic strategies capable of eliminating cancer cells while simultaneously targeting CSC-associated pathways holds substantial clinical promise. This study aimed to evaluate the combined effects of zinc phthalocyanine-mediated photodynamic therapy (ZnPc-PDT) combined with oxaliplatin on cervical cancer cells. The focus was on assessing cell viability, apoptosis, colony formation, migration, stemness characteristics, and the expression of key genes involved in CSC regulation. Human cervical cancer cell lines (HeLa and Caski) were treated with ZnPc-PDT, oxaliplatin, or their combination. Cytotoxicity was measured using MTT assays, while apoptosis was evaluated by Annexin V/PI flow cytometry and expression profiling of apoptosis-related genes (CASPASE3, CASPASE8, CASPASE9, BCL2). Colony-forming assays were used to assess stemness potential, and wound-healing assays evaluated cell migration. Quantitative real-time PCR (qRT-PCR) was performed to examine the expression of stemness-related markers (SOX2, OCT4, CD133, CD44) and metastasis-associated genes (MMP2, MMP9, ROCK1). Additionally, in silico pathway analysis using TCGA-CESC, STRING, and Enrichr datasets identified oxaliplatin-targeted genes involved in CSC regulation and validated the experimental observations. Human cervical cancer cell lines (HeLa and Caski) were treated with ZnPc-PDT, oxaliplatin, or their combination. Cytotoxicity was measured using MTT assays, while apoptosis was evaluated by Annexin V/PI flow cytometry and expression profiling of apoptosis-related genes (CASPASE3, CASPASE8, CASPASE9, BCL2). Colony-forming assays were used to assess stemness potential, and wound-healing assays evaluated cell migration. Quantitative real-time PCR (qRT-PCR) was performed to examine the expression of stemness-related markers (SOX2, OCT4, CD133, CD44) and metastasis-associated genes (MMP2, MMP9, ROCK1). Additionally, in silico pathway analysis using TCGA-CESC, STRING, and Enrichr datasets identified oxaliplatin-targeted genes involved in CSC regulation and validated the experimental observations. The combination of ZnPc-PDT and oxaliplatin exhibits potent anti-cancer effects by inducing apoptosis, suppressing migration, reducing stemness, and modulating key cancer-related pathways. By integrating molecular experiments with in silico analysis, this study provides mechanistic insights into how PDT enhances oxaliplatin efficacy. These findings suggest that ZnPc-PDT combined with oxaliplatin may represent a promising therapeutic strategy to overcome drug resistance and reduce recurrence in cervical cancer treatment.
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