Related Experiment Video
Updated: Jun 26, 2026
A Data Integration Workflow to Identify Drug Combinations Targeting Synthetic Lethal Interactions
Published on: May 27, 2021
Zoledronic acid induces caspase-dependent apoptosis in renal cancer cell lines
Anders Ullen1, Stephan Schwarz, Lena Lennartsson
1Department of Oncology-Pathology, Karolinska Institute, Stockholm, Sweden. anders.ullen@karolinska.se
Objective:
To study and characterize the potential antitumoral effects of zoledronic acid (ZA) on renal cancer cell lines in vitro.
Material And Methods:
Three different and well-characterized renal cancer cell lines were studied, namely ACHN, A-498 and CAKI-2. The cytotoxic potential of ZA was evaluated using a fluorometric microculture cytotoxic assay. The degree of M30 induction following ZA treatment was measured using an M30 enzyme-linked immunosorbent assay (ELISA), and the blockage of this effect was studied using a pan-caspase inhibitor. Immunofluorescence of the M30 neoepitope was performed to visualize the M30-inducing properties of ZA.
Results:
A significant reduction in viable cells was seen for all three cell lines following treatment with ZA, compared with untreated controls. This effect was most pronounced for the ACHN cells, as only 4% were viable following incubation with ZA for 72 h. A concomitant increase in the apoptosis significant caspase-dependent M30 antigen was demonstrated. This effect could be blocked by the pan-caspase inhibitor Z-VAD.
Conclusions:
ZA exerts cytotoxic effects on renal cancer cell lines in vitro. These include caspase-dependent induction of apoptosis, which can be quantified and visualized using M30 ELISA and immunofluorescence, respectively. The clinical relevance of this finding needs to be further investigated, but these results indicate that ZA may be a treatment alternative for selected patients with skeletal metastasized renal cell cancer, particularly for those with impaired performance status without other treatment options.
Insights
Zoledronic acid (ZA) shows significant cytotoxic effects on renal cancer cell lines in vitro. This drug induces caspase-dependent apoptosis, suggesting potential as a treatment for advanced renal cell carcinoma.
Area of Science:
- Oncology
- Pharmacology
- Cell Biology
Background:
- Renal cell carcinoma (RCC) is a significant health concern.
- Novel therapeutic strategies are needed for advanced RCC.
- Zoledronic acid (ZA) is a bisphosphonate with known antitumoral properties.
Purpose of the Study:
- To investigate the in vitro antitumoral effects of zoledronic acid (ZA) on renal cancer cell lines.
- To characterize the mechanism of ZA-induced cytotoxicity in renal cancer cells.
Main Methods:
- Three human renal cancer cell lines (ACHN, A-498, CAKI-2) were used.
- Cytotoxicity was assessed using a fluorometric microculture assay.
- Apoptosis induction was measured via M30 ELISA and immunofluorescence, with caspase inhibition studies.
Main Results:
- Zoledronic acid significantly reduced viable cells across all tested renal cancer lines.
- ACHN cells exhibited the highest sensitivity, with only 4% viability after 72h ZA treatment.
- ZA treatment induced caspase-dependent apoptosis, evidenced by M30 antigen increase, which was blocked by a pan-caspase inhibitor.
Conclusions:
- Zoledronic acid demonstrates potent in vitro cytotoxic effects against renal cancer cell lines.
- The antitumoral activity involves caspase-dependent apoptosis.
- ZA warrants further investigation as a potential therapeutic agent for metastatic renal cell carcinoma, especially in patients with limited treatment options.
Related Concept Videos
01:24Caspases
01:31The Intrinsic Apoptotic Pathway