Nature | 熊梦华/鲍燕/程建军/肖石燕合作设计工程化激活型膜裂解聚肽
Ranking
Overall
68
Content
75
Popularity
N/A
No observed public metrics; popularity remains neutral/archived.
Merged summary
TL;DR - A Nature paper (Xiong Menghua, Bao Yan, Cheng Jianjun, Xiao Shiyan) reports an acid-responsive membranolytic polypeptide (aMP) that programs an artificial, pore-forming-protein-independent immunogenic membranolytic cell death in tumor cells, boosting immune checkpoint blockade.
- Motivation: natural membranolytic cell death (pyroptosis, necroptosis) depends on pore-forming proteins (Gasdermin, MLKL) whose tumor heterogeneity, mutation status and complex caspase-dependent activation cause inconsistent, sometimes immunologically silent outcomes.
- Design: maleic anhydride derivatives modify primary amines on radially amphiphilic polypeptide side chains, creating pH-labile amide bonds plus carboxyls; competing electrostatic/H-bond interactions disrupt the helix, and the anhydride substituent tunes pH response and activation kinetics.
- Lead compound aMP C16-CA50 (citraconic anhydride) responds in stages: negatively charged non-helical nanoparticles at pH 7.4 (low uptake/toxicity); charge-neutral, enlarged particles at tumor pH 6.8 (enhanced uptake into lysosomes); hydrolysis at lysosomal pH ≤5.5 restores the membranolytic helix.
- Key mechanism: a deliberately delayed transition from lysosomal membrane rupture (LMR) to plasma membrane rupture (PMR)—enabled by dose-dependent but saturable inhibition by anionic phospholipids—opens a time window for leaked lysosomal contents to drive immunogenicity, activating CD8+ T cell responses and enabling a potent antitumor vaccine.
Sources (1)
Nature | 熊梦华/鲍燕/程建军/肖石燕合作设计工程化激活型膜裂解聚肽
Public signals
N/A
TL;DR - A Nature paper (Xiong Menghua, Bao Yan, Cheng Jianjun, Xiao Shiyan) reports an acid-responsive membranolytic polypeptide (aMP) that programs an artificial, pore-forming-protein-independent immunogenic membranolytic cell death in tumor cells, boosting immune checkpoint blockade.
- Motivation: natural membranolytic cell death (pyroptosis, necroptosis) depends on pore-forming proteins (Gasdermin, MLKL) whose tumor heterogeneity, mutation status and complex caspase-dependent activation cause inconsistent, sometimes immunologically silent outcomes.
- Design: maleic anhydride derivatives modify primary amines on radially amphiphilic polypeptide side chains, creating pH-labile amide bonds plus carboxyls; competing electrostatic/H-bond interactions disrupt the helix, and the anhydride substituent tunes pH response and activation kinetics.
- Lead compound aMP C16-CA50 (citraconic anhydride) responds in stages: negatively charged non-helical nanoparticles at pH 7.4 (low uptake/toxicity); charge-neutral, enlarged particles at tumor pH 6.8 (enhanced uptake into lysosomes); hydrolysis at lysosomal pH ≤5.5 restores the membranolytic helix.
- Key mechanism: a deliberately delayed transition from lysosomal membrane rupture (LMR) to plasma membrane rupture (PMR)—enabled by dose-dependent but saturable inhibition by anionic phospholipids—opens a time window for leaked lysosomal contents to drive immunogenicity, activating CD8+ T cell responses and enabling a potent antitumor vaccine.