Tumors hijack stem cell signals in surrounding tissue
Tumors damage surrounding tissue. That has long been known. But a new study shows they also actively block the renewal of nearby healthy stem cells by mimicking a signal that normally only the stem cell niche produces.
Stem cells depend on a specialized local environment called the stem cell niche. This niche sends signals that determine when a stem cell self-renews and when it matures into a specialized cell. That balance is essential for tissue maintenance.
In a study using fruit flies (Drosophila), the researchers found that tumors in the ovaries produce a signaling protein from the BMP family, which normally originates only from the niche. By mimicking this signal, tumors keep neighboring stem cells in a non-differentiating state. The stem cells no longer mature into functional cells.
What this reveals about indirect tumor damage
This mechanism explains two things. First, how tumors cause indirect harm: not only by occupying space, but by disrupting the normal renewal cycle of healthy tissue. Second, it offers a possible explanation for why tissue surrounding tumors sometimes ages faster or recovers more slowly.
For aging research, this is relevant because similar disruptions to the stem cell niche also occur during normal aging, without any cancer being present. If tumors deliberately activate this mechanism, it may shed light on how tissue renewal fails during ordinary aging as well.
From fly to mammal
Fruit flies are a classic model organism in cell biology. Many mechanisms first identified in flies have later been confirmed in mammals. That gives this finding potential broader relevance.
The next question is whether tumors in mammals use the same BMP-based strategy to suppress neighboring stem cells. If so, there may be therapeutic approaches that protect surrounding tissue alongside treating the tumor itself.
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