In Vitro Technique Details Cancer Cell Attachment and Spread

Using a time-lapse imaging system, they found that PDAC microtumors actively stretched to catch dead cell debris via filipodia (hair-like projections similar to those used for locomotion by some amoebas) and lamellipodia (cytoskeletal actin projections on the mobile edge of the cell).

The etched microplate method enabled visualization of live tumor dynamics; the microtumors endocytosed debris-derived surface nucleosides directly into vacuoles and then accumulated dead cell-derived phosphatidylserine (PS) on their surfaces (resulting in PS externalization, a cause of cancer immune evasion).

"Cancer studies so far either use cell cultures in which cancer cells do not necessarily behave naturally, or tissue samples that do not allow live observation. So there is a big gap in our knowledge of how cancer cells actually behave," said first author Dr. Yukiko Miyatake, assistant professor of pathology at Hokkaido University. "I hope this easy and low-cost technique will find widespread adoption. If the discoveries made during these first observations are physiologically or pathologically relevant phenomena, many more new hints may be gleaned for the development of more effective cancer treatment approaches."

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