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<p>A landmark 2026 <i>Cell</i> publication by Chai et al. characterized Ruptosis, a previously unclassified form of regulated cell death executed by specialized glandular immune cells termed ruptoblasts in the planarian <i>Schmidtea mediterranea</i>. Triggered exclusively by elevated activin (a dual hormone/inflammatory cytokine), Ruptosis manifests rapid, contact-independent explosive cellular disintegration and releases diffusible toxins to eliminate aberrant somatic cells, stem cells and invading bacteria. Distinct from apoptosis, pyroptosis, necroptosis, ferroptosis and neutrophil NETosis at morphological, biochemical and kinetic levels, this novel lytic pathway substantially expands the canonical regulated cell death (RCD) classification system. This commentary outlines the defining unique features of Ruptosis and discusses its evolutionary implications for cell death and innate immunity research.</p>

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Ruptosis: a novel hormone-triggered cytotoxic cell death program linking endocrine homeostasis to innate immunity

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Feng Tang

摘要

A landmark 2026 Cell publication by Chai et al. characterized Ruptosis, a previously unclassified form of regulated cell death executed by specialized glandular immune cells termed ruptoblasts in the planarian Schmidtea mediterranea. Triggered exclusively by elevated activin (a dual hormone/inflammatory cytokine), Ruptosis manifests rapid, contact-independent explosive cellular disintegration and releases diffusible toxins to eliminate aberrant somatic cells, stem cells and invading bacteria. Distinct from apoptosis, pyroptosis, necroptosis, ferroptosis and neutrophil NETosis at morphological, biochemical and kinetic levels, this novel lytic pathway substantially expands the canonical regulated cell death (RCD) classification system. This commentary outlines the defining unique features of Ruptosis and discusses its evolutionary implications for cell death and innate immunity research.