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Anticancer Efficacy of Photodynamic Therapy with Lung Cancer-Targeted Nanoparticles
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Multimodality imaging of naturally active melanin nanoparticles targeting somatostatin receptor subtype 2 in human

Lei Xia1, Xiaoyi Guo, Teli Liu

  • 1Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Department of Nuclear Medicine, Peking University Cancer Hospital & Institute, Beijing, 100142, China. zhuhuananjing@163.com pekyz@163.com.

Nanoscale
|July 24, 2019
PubMed

Insights

Researchers developed a novel nanoprobe for multimodal imaging of small-cell lung cancer (SCLC). This probe targets SCLC tumors expressing somatostatin receptor subtype 2 (SSTR2), enabling enhanced detection via photoacoustic imaging, MRI, and PET scans.

Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Oncology

Background:

  • Pulmonary neuroendocrine tumors, including small-cell lung cancer (SCLC), represent a significant portion of lung cancer cases.
  • Somatostatin receptor subtype 2 (SSTR2) is highly expressed in SCLC, making it a potential therapeutic and diagnostic target.
  • Multimodal imaging agents are needed to provide comprehensive tumor integrity information for SCLC.

Purpose of the Study:

  • To construct a novel multifunctional nanoprobe for targeted multimodal imaging of SCLC.
  • To evaluate the efficacy of the developed nanoprobe in a preclinical SCLC model.

Main Methods:

  • Organic melanin nanoparticles (MNPs) were synthesized and surface-functionalized with octreotide, a somatostatin analog, creating OCT-PEG-MNPs.
  • MNPs were labeled with manganese (Mn2+) for magnetic resonance imaging (MRI) and iodine-124 (124I) for positron emission tomography (PET).
  • The multimodal imaging capabilities of the (124I, Mn) OCT-PEG-MNPs were assessed in an NCI-H69 SCLC tumor xenograft model with high SSTR2 expression.

Main Results:

  • The (124I, Mn) OCT-PEG-MNPs demonstrated effective multimodal imaging performance in photoacoustic imaging (PAI), MRI, and PET.
  • PAI showed increasing signal in the tumor site over time.
  • MRI revealed enhanced T1-weighted signal intensity in the xenograft 24 hours post-injection.
  • PET and biodistribution studies indicated significantly higher uptake in SCLC tumors compared to control models.

Conclusions:

  • The developed (124I, Mn) OCT-PEG-MNPs are effective for multimodal imaging of SCLC with high SSTR2 expression.
  • This nanoprobe integrates PAI, MRI, and PET capabilities, offering a promising tool for SCLC diagnosis and management.
  • The organic nanoparticle-based nanoprobe shows potential for future clinical translation.

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