Ovarian cancer spread often occurs when multicellular clusters, known as spheroids, detach from the primary tumor and navigate the abdominal cavity. These cell clusters are remarkably complex, presenting as either solid, irregular masses or smooth, hollow structures. For many years, scientists have explored how these diverse forms arise and their impact on cancer dissemination speed. A groundbreaking new study from the National Centre for Biological Sciences (NCBS-TIFR) in Bengaluru, in collaboration with the Indian Institute of Science (IISc), now provides crucial answers.
Published in the journal ‘Small’, this research highlights two common environmental factors—calcium and pH (acidity or alkalinity)—as sufficient determinants for the behavior of these cell clusters. Led by graduate student Sreepadmanabh M, the team specifically investigated hollow structures, termed blastuloids, which exhibit a striking pattern of repeated expansion and shrinkage.
Understanding Tumor Spheroid Dynamics and Ovarian Cancer Spread
Remarkably, these blastuloids pulse, collapse, and then slowly recover their shape, mimicking a heartbeat in slow motion. Despite the dramatic collapse, the cluster consistently regains its original form. This resilience stems from E-cadherin junctions, a natural cellular “glue” that relies on calcium for its strength. Consequently, researchers manipulated calcium levels, causing hollow clusters to collapse into solid lumps within minutes. Reversibly, restoring calcium rapidly re-formed the hollow structures, much faster than their initial formation. Intriguingly, even clusters disassembled into single cells could rebuild themselves into complex hollow forms within just two days, a process usually taking over a week.
Chemical Switches: Calcium and pH in Metastasis
Moreover, the study revealed that the environmental pH, representing acidity or alkalinity, similarly influences spheroid behavior. Cancer cells in the abdomen often reside in acidic fluid. Under acidic conditions, the hollow structures maintained their form and ceased pulsing. Conversely, in alkaline environments, they quickly collapsed into solid clusters. Importantly, this process proved reversible; returning to a normal pH restored the hollow structures.
These collective findings underscore that ovarian cancer spread is not solely governed by genetic mutations but also significantly by the chemical composition of its surrounding environment. Dr. Tapomoy Bhattacharjee, head of the laboratory, emphasized, “With just two knobs—calcium and pH—we can tune the form and fate of entire cell collectives.” This pioneering work opens new avenues for comprehending ovarian cancer dissemination. Eventually, it may lead to innovative treatments that specifically target these chemical signals to impede or halt disease progression. This research is particularly relevant to those pursuing advanced knowledge in cancer and clinical oncology.
Frequently Asked Questions
Q1: What role do spheroids play in ovarian cancer spread?
Spheroids are complex cell clusters that break away from the original tumor and float through the abdomen, facilitating the spread of ovarian cancer to new sites.
Q2: What “chemical switches” were identified in the Bengaluru study?
The study identified calcium and pH (acidity or alkalinity) as key chemical switches that determine the behavior and structure of ovarian cancer spheroids.
Q3: How might these findings impact future ovarian cancer treatments?
The research suggests new possibilities for understanding and treating ovarian cancer by targeting the chemical environment and specific signals like calcium and pH to slow or stop tumor progression. Understanding oncology is crucial for developing such targeted therapies.
References
- B’luru team links chemical switches to tumour spread – ETHealthworld
- New study finds how calcium and pH regulate ovarian cancer spheroids – The Hindu
- Cracking cancer code: Bengaluru team links chemical switches to tumour spread – Times of India
- Advances in the study of cancer metastasis and calcium signaling as potential therapeutic targets – PMC – PubMed Central
- Spontaneous spheroid budding from monolayers: a potential contribution to ovarian cancer dissemination – PMC
- Metabolic Reprogramming of Ovarian Cancer Spheroids during Adhesion – PMC
- Deciphering the Role of Ca2+ Signalling in Cancer Metastasis: From the Bench to the Bedside – PMC
- National Centre for Biological Sciences, Tata Institute of Fundamental Research (NCBS, TIFR) – Murty Trust
- Primary Epithelial Ovarian Cancer Cells form Spheroids when Cultured on Corning® Ultra-Low Attachment Surfaces
- Roles of calcium signaling in cancer metastasis to bone – Open Exploration Publishing
- Ovarian Cancer Spheroid Cells with Stem Cell-Like Properties Contribute to Tumor Generation, Metastasis and Chemotherapy Resistance through Hypoxia-Resistant Metabolism | PLOS One
- Roles of calcium signaling in cancer metastasis to bone – ResearchGate
- The role of calcium signaling in organotropic metastasis of cancer – ResearchGate
- National Centre for Biological Sciences – TIFR NCBS – IndiaBioscience
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