Cell-surface photochemistry mediated calcium overload for synergistic tumor therapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Calcium (Ca2+) is crucial for mitochondrial function, especially in rapidly metabolizing cancer cells.
• Photochemistry-induced calcium overload is a promising strategy for tumor suppression.

Purpose of the Study:

• To develop a photonanomedicine for synergistic calcium overload and tumor suppression.
• To target cancer cells specifically using anti-CD20 aptamers.

Main Methods:

• Upconversion nanoparticles (UCNPs) loaded with protoporphyrin IX (PpIX) were functionalized with photo-crosslinking cinnamate groups and anti-CD20 aptamers.
• The photonanomedicine targets CD20 receptors on cancer cells.
• NIR laser irradiation triggers UV light emission, causing cinnamate crosslinking and PpIX excitation.

Main Results:

• UV light induced CD20 receptor clustering, leading to Ca2+ influx.
• UV light also generated reactive oxygen species (ROS), disrupting cell membranes and causing Ca2+ influx.
• Synergistic Ca2+ overload demonstrated enhanced anti-tumor efficacy.

Conclusions:

• The developed photonanomedicine effectively induces synergistic calcium overload for tumor suppression.
• This approach offers a novel strategy for manipulating intracellular calcium concentrations in cancer therapy.