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Enhancing Photothermal Therapy Against Breast Cancer Cells by Modulating the End Point of Gold Shell-Isolated

Sabrina A Camacho1, Pedro H B Aoki1, Frida Ekstrand2

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Summary
This summary is machine-generated.

Nanostraw injection significantly boosts gold shell-isolated nanoparticle (AuSHIN) effectiveness for photothermal therapy (PTT) in breast cancer cells. This method improves nanoparticle uptake and intracellular targeting, leading to enhanced cancer cell death compared to traditional incubation.

Keywords:
breast cancer cellsgold shell-isolated nanoparticlesincubationnanostraw-assisted injectionphotothermal therapy

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Cancer Therapy

Background:

  • Gold shell-isolated nanoparticles (AuSHINs) show promise for photothermal therapy (PTT) due to their properties.
  • Limitations include poor cellular uptake and lysosomal entrapment, reducing PTT efficacy.
  • Overcoming these delivery challenges is crucial for effective cancer treatment.

Purpose of the Study:

  • To investigate if nanostraw-assisted injection enhances AuSHIN delivery and PTT efficacy in breast cancer cells.
  • To compare cellular uptake, intracellular localization, and cell death pathways between nanostraw injection and conventional incubation.
  • To evaluate the impact of delivery method on PTT effectiveness in MDA-MB-231 and MCF7 cell lines.

Main Methods:

  • AuSHINs were delivered to human breast cancer cell lines (MDA-MB-231, MCF7) using nanostraw-assisted injection and conventional incubation.
  • Cellular internalization of AuSHINs was quantified.
  • Intracellular localization of AuSHINs was visualized using confocal fluorescence microscopy.
  • Cell viability was assessed after photothermal activation.
  • Apoptosis initiation was monitored.

Main Results:

  • Nanostraw injection yielded approximately 10-fold higher AuSHIN internalization than incubation.
  • Incubation led to lysosomal entrapment, while nanostraw injection targeted the endoplasmic reticulum (ER).
  • Nanostraw delivery resulted in a ~2-fold greater reduction in cancer cell viability and accelerated apoptosis.
  • MCF7 cells showed greater PTT-induced cell death than MDA-MB-231 cells.

Conclusions:

  • Nanostraw-assisted injection is a superior method for delivering AuSHINs for PTT compared to incubation.
  • This technique enhances nanoparticle internalization, promotes ER targeting, and improves PTT-induced cancer cell death.
  • Further research is needed to adapt nanostraw injection for in vivo applications.