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Related Concept Videos

Overview of Exosomes01:36

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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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Tumor Immunotherapy01:27

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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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Preparation of Exosomes for siRNA Delivery to Cancer Cells
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Functionalized DNA Enables Programming Exosomes/Vesicles for Tumor Imaging and Therapy.

Zhijin Fan1, Keng Xiao1, Jingyan Lin1

  • 1Center for Infection and Immunity, the Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai, 519000, China.

Small (Weinheim an Der Bergstrasse, Germany)
|October 16, 2019
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Researchers developed a novel method to label exosomes with quantum dots (QDs) for tumor cell targeting and created artificial M1 macrophage vesicles for combined biological treatment and chemotherapy, offering a new approach for tumor therapy.

Keywords:
biological treatmentchemotherapyfunctionalized DNAprogramming exosomes/vesicles

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Cancer Therapy

Background:

  • Exosomes are crucial intercellular communicators involved in physiological and pathological processes.
  • Developing effective and biocompatible methods for exosome labeling and functionalization is essential for targeted therapies.
  • Current tumor treatment strategies often require enhancement in specificity and efficacy.

Purpose of the Study:

  • To engineer a biocompatible strategy for labeling exosomes using DNA-anchored quantum dots (QDs) for tumor cell recognition.
  • To construct artificial M1 macrophage vesicles (M1mv) for direct tumor cell killing and biological treatment.
  • To develop a target-triggered drug delivery system for enhanced M1mv antitumor efficacy and visual therapy.

Main Methods:

  • Functionalized DNA was used to anchor QDs onto exosome surfaces, creating an exosome-DNA-QDs complex.
  • Artificial M1 macrophage vesicles (M1mv) were engineered using a pneumatic liposome extruder.
  • A microRNA-responded drug delivery system was constructed for targeted and visual tumor therapy.

Main Results:

  • The QDs-labeled exosomes demonstrated swift uptake by tumor cells, indicating potential for specific tumor labeling.
  • Individual M1mv exhibited direct tumor cell-killing capabilities and therapeutic effects.
  • The engineered drug delivery system enhanced M1mv antitumor efficacy and enabled specific, visual drug release.

Conclusions:

  • The developed strategies enable moderate labeling and functionalization of exosomes and vesicles.
  • Artificial drug-delivery vesicles were constructed with combined biological treatment and chemotherapy functions.
  • These advancements present a potential new paradigm for tumor labeling and therapy.