Bone-targeting polymer vesicles for simultaneous imaging and effective malignant bone tumor treatment

Area of Science:

• Biomaterials Science
• Nanomedicine
• Oncology

Background:

• Malignant bone tumors present significant diagnostic and therapeutic challenges.
• Integrated platforms for simultaneous diagnosis and treatment are highly desirable for improved patient outcomes.

Purpose of the Study:

• To develop and evaluate a novel bone-targeting polymer vesicle for simultaneous diagnosis and treatment of malignant bone tumors.
• To assess the imaging capability and drug delivery efficiency of the polymer vesicle in preclinical bone tumor models.

Main Methods:

• Self-assembly of poly(ε-caprolactone)₆₇-b-poly[(L-glutamic acid)₆-stat-(L-glutamic acid-alendronic acid)₁₆] (PCL₆₇-b-P[Glu₆-stat-(Glu-ADA)₁₆]) polymer vesicles in water.
• In vivo evaluation using single photon emission computed tomography/computed tomography (SPECT/CT) for dynamic drug tracking in rabbit bone tumor models.
• Assessment of therapeutic efficacy through tumor size reduction and pathological analysis (necrosis and apoptosis).

Main Results:

• The polymer vesicle demonstrated excellent single photon emission computed tomography/computed tomography (SPECT/CT) imaging capability.
• High antitumor drug delivery efficiency was observed, leading to significant tumor size reduction (>2.0 cm³ to <0.6 cm³ in 11 days).
• Pathological analysis confirmed tumor cell necrosis and apoptosis, indicating effective therapeutic action.

Conclusions:

• The developed bone-targeting polymer vesicle serves as an effective integrated platform for simultaneous diagnosis and therapy of malignant bone tumors.
• This nanomedicine approach offers a promising strategy for real-time monitoring and treatment of bone cancers.