Weizmann scientists identify caspase mechanism that helps damaged tissue regenerate
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Researchers at the Weizmann Institute of Science have identified a molecular mechanism involving caspases that enables severely damaged epithelial tissue to regenerate. The study, published in Nature Communications, shows caspases can make certain cells resistant to death, allowing them to rebuild tissue. The same mechanism may explain why some cancers return in aggressive, treatment-resistant forms.
Key Facts
- The study was published in Nature Communications by researchers at the Weizmann Institute of Science.
- Compensatory proliferation was first documented in the 1970s when irradiated fly larvae regenerated fully functional wings.
- Caspases, enzymes best known for promoting cell death, can also help certain cells become resistant to death and participate in tissue rebuilding.
- Cancer cells may exploit this survival mechanism, potentially contributing to tumors that return in a more aggressive and treatment-resistant form.
Caspase Survival Mechanism
Apoptosis, a controlled form of cellular suicide, involves initiator and effector caspases that break apart proteins inside the doomed cell. Over the past two decades, researchers including Prof. Eli Arama at Weizmann's Molecular Genetics Department have shown that apoptotic caspases also participate in biological processes essential for life. Arama suspected these nonlethal caspase functions might help drive compensatory proliferation.
Experimental Regeneration Evidence
Dr. Tslil Braun from Arama's lab recreated the classic experiment that originally revealed compensatory proliferation. The original experiment exposed fly larvae to high doses of radiation, causing major damage to epithelial tissue, yet the larvae regenerated fully functional wings. Similar regenerative responses have since been observed across many species, including humans.
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