Photomechanical engineering of immunogenic whole-cell vaccines by laser-induced vapor nanobubbles for bladder cancer prophylaxis

Laser-induced vapor nanobubbles (VNB) generated from dextran-coated iron oxide nanoparticles photomechanically kill MB49 bladder cancer cells while preserving immunogenic signals, including calreticulin exposure and ATP/HMGB1 release.

• Why it matters: Whole-cell cancer vaccines require inactivation that maintains “danger” cues, but drug-free, externally triggered manufacturing that reliably preserves immunogenicity is still needed.
• What they did: The study used laser-induced VNB conditions on MB49 cells and reproduced early killing plus calreticulin exposure in UPPL1541 cells, then tested vaccination in subcutaneous and orthotopic bladder cancer models.
• The result: VNB-killed MB49 vaccination reduced tumor incidence and growth, enhanced splenocyte antitumor activity, prevented MRI-detectable orthotopic tumor formation, and showed no evident local or systemic toxicity over seven days.

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