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Home NEWS Science News Biology

Cell Painting Reveals Flavonoids Toxic to Bladder Cancer Cells

Bioengineer by Bioengineer
September 6, 2025
in Biology
Reading Time: 4 mins read
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Cell Painting Reveals Flavonoids Toxic to Bladder Cancer Cells
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A groundbreaking study led by researchers at Baylor College of Medicine has unveiled a compelling class of natural compounds with potential to revolutionize bladder cancer treatment. Their work, recently published in the esteemed journal Pharmacological Research – Natural Products, highlights flavonoids—plant-derived molecules long recognized for their diverse biological activities—as potent killers of bladder cancer cells in laboratory cultures. Utilizing advanced imaging technology known as Cell Painting, the team not only identified several toxic flavonoids but also illuminated the intricate cellular mechanisms underlying their anti-cancer effects.

Cell Painting represents a cutting-edge high-throughput microscopy method that labels multiple cellular components with fluorescent dyes, capturing thousands of images that reveal subtle morphological changes in cells exposed to diverse compounds. According to the study’s corresponding author, Dr. Michael Mancini, professor of molecular and cellular biology and director of Baylor’s Integrated Microscopy Core, this technology allows researchers to observe cellular responses at an unprecedented resolution. By applying custom image analysis pipelines, the team quantified dynamic alterations in cellular structures, providing a detailed phenotypic fingerprint of how each flavonoid interacts with cancer cells.

One of the major challenges of such high-content screening approaches is the sheer volume of data generated. Each Cell Painting experiment can produce over 57,000 confocal microscopy images per plate, a dataset too vast for manual analysis and often requiring substantial computational resources. To overcome this bottleneck, Dr. Mancini’s lab developed SPACe (Swift Phenotypic Analysis of Cells), a novel computational tool capable of individually assessing thousands of cells across numerous experimental plates. Impressively, SPACe can operate efficiently on standard desktop computers, making large-scale drug screening accessible to laboratories regardless of their computational infrastructure.

Applying this powerful methodology, the research team analyzed a library of 244 flavonoid compounds against three widely studied bladder cancer cell lines. Their findings revealed six flavonoids exhibiting significant cytotoxicity, effectively eliminating malignant cells without harming normal bladder cells. Among these were flavopiridol and rotenone, compounds already known for their toxic effects, thereby validating the accuracy of their screening approach. Intriguingly, some flavonoids acted through inducing DNA damage in the cancer cells, while others disrupted mitochondrial function—a critical pathway for cellular energy production—signaling multiple therapeutic mechanisms within this compound class.

Beyond traditional two-dimensional cultures, the study advanced towards more physiologically relevant models, including 3D spheroids and chorioallantoic membrane (CAM) systems, which better mimic tumor architecture and microenvironment. Three of the toxic flavonoids were found to reduce tumor growth in these 3D culture systems as well, reinforcing their potential clinical utility. Significantly, these compounds did not inhibit growth in normal bladder cells, suggesting a degree of cancer cell specificity that could minimize harmful side effects in future therapies.

Among the standout compounds is xanthohumol, a flavonoid derived from hops and found in certain types of beer. The study uncovered that xanthohumol-induced cell death was tightly linked to a reduction in lipid metabolism, particularly a pronounced decrease in the number of lipid droplets within cancer cells. Lipid droplets serve not only as energy stores but also as mediators of cellular signaling and stress responses, marking a novel mechanism of flavonoid-induced cytotoxicity. The possible correlation between xanthohumol consumption and bladder cancer incidence presents a fascinating avenue for epidemiological exploration.

The implications of this research extend well beyond the identification of promising flavonoids. By harnessing the combined power of Cell Painting and SPACe, the Baylor team demonstrated a scalable and precise platform for phenotypic drug discovery that captures the complex heterogeneity of cancer cell populations. This approach allows scientists to classify compounds based on their distinct cellular impact profiles, accelerating the next generation of targeted oncology therapeutics.

Flavonoids themselves are ubiquitously present in fruits, vegetables, and beverages, which raises intriguing possibilities about natural dietary components contributing to cancer prevention or therapy. However, the translation of these in vitro findings to clinical applications requires rigorous validation, including assessment of flavonoid safety, bioavailability, and efficacy in living organisms. The authors emphasize ongoing plans to test these compounds in animal models bearing human bladder tumors and eventually move towards clinical trials to evaluate their therapeutic potential in patients.

The study was a collaborative effort including researchers Jessica Oceguera, Alejandra Rivera Tostado, Christopher D. Candler, Elina Mosa, Kazem Safari, and Maureen G. Mancini. These contributors brought expertise spanning molecular biology, microscopy, and computational analysis, while their institutional support included Baylor College of Medicine and the Texas A&M University’s GCC Center for Advanced Microscopy and Image Informatics.

Funding for this research was provided by multiple prestigious grants, notably from the Cancer Prevention and Research Institute of Texas (CPRIT), the GCC Center for Precision Environmental Health, and the Dan L Duncan Comprehensive Cancer Center. These support mechanisms highlight the critical investment required to facilitate transformative cancer research employing cutting-edge technologies.

As bladder cancer continues to rank as the fifth most common cancer in the United States, causing over 16,000 deaths annually, the need for innovative treatments is urgent. Current clinical practices, while effective at tumor removal and relapse control, often struggle with residual disease that can metastasize. The identification of flavonoids exhibiting selective cytotoxicity against bladder cancer cells offers a hopeful new avenue for improving patient outcomes through less toxic and potentially more effective therapies.

In summary, the marriage of phenotypic screening technologies with natural product libraries exemplified in this study sets a new paradigm in oncology drug discovery. Flavonoid compounds such as xanthohumol exhibit unique cellular interactions that disrupt cancer metabolism and genomic integrity, positioning them as attractive candidates for future therapeutics. This exciting research not only generates a wealth of actionable knowledge but also opens the door to safer, more accessible, and finely tuned cancer treatments, potentially redefining the therapeutic landscape for bladder cancer.

Subject of Research: Human tissue samples

Article Title: A phenotypic screen identifies xanthohumol and other flavonoids as killers of bladder cancer

News Publication Date: 22-Apr-2025

Web References:

Pharmacological Research – Natural Products Journal
DOI: 10.1016/j.prenap.2025.100236

Keywords: Human health, Imaging, Microscopy, Organismal biology, Oncology

Tags: advanced imaging technology in biologyanti-cancer effects of natural compoundsBaylor College of Medicine researchbladder cancer cell toxicityCell Painting microscopy techniquecellular mechanisms of flavonoidsflavonoids in cancer treatmenthigh-throughput screening methodsmorphological changes in cancer cellsnatural products in pharmacological researchphenotypic fingerprinting in cell biologyquantitative analysis of cellular responses

Tags: Bladder cancer cytotoxicityComputational image analysis in oncologyFlavonoid-based cancer therapyHigh-throughput Cell PaintingPhenotypic drug screening platforms
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