OHSU Researchers Discover Internal Fluid "Trade Winds" That Rapidly Propel Proteins to Fuel Cancer Cell Migration and Wound Healing

Researchers discover that cells use directed fluid flows, not just diffusion, to move proteins. This "trade wind" system helps explain cancer spread and repair.

By: AXL Media

Published: Mar 30, 2026, 6:29 AM EDT

Source: Information for this report was sourced from Oregon Health & Science University

Rewriting the Mechanics of Intracellular Transport

For decades, the foundational understanding of cellular biology rested on the principle of diffusion, where proteins were thought to drift aimlessly until reaching their functional destinations. However, a breakthrough study from Oregon Health & Science University (OHSU) has revealed that cells do not leave the movement of vital materials to chance. Instead, they utilize a sophisticated system of internal "trade winds" to actively push proteins toward the cell's front. This discovery, published in Nature Communications, suggests that cells possess a high-speed delivery network that is far more efficient than the random drifting previously described in textbooks.

The Accidental Discovery of the FLOP Wave

The identification of these fluid currents began as an unexpected observation during a neurobiology course at the Marine Biological Laboratory. Researchers Catherine and James Galbraith utilized a laser to track protein movement, only to find an unexplained dark line appearing at the cell's advancing edge. This "second line" turned out to be a wave of soluble actin being shoved forward by an internal current. The team developed a specialized imaging assay nicknamed FLOP, or "Fluorescence Leaving the Original Point," to track these movements, confirming that cells "go with the flow" rather than relying on the slow pace of passive molecular drifting.

Squeezing the Cellular Sponge

The mechanism behind these internal winds is purely mechanical, involving a contractile process at the rear of the cell. The researchers compare the action to squeezing one half of a wet sponge, which forces the water to surge toward the uncompressed side. By selectively squeezing its posterior, the cell creates a targeted stream of fluid that sweeps up a variety of proteins and carries them to the leading edge. This nonspecific transport system allows the cell to rapidly supply the raw materials needed for protrusion and adhesion, which are the fundamental steps of both healthy immune responses and pathological disease progression.