Nanoparticle-cell interactions induced apoptosis: a case study with nanoconjugated epidermal growth factor

Area of Science:

• Nanomedicine
• Cell Biology
• Biotechnology

Background:

• Biofunctionalized nanoparticles (NP) can induce apoptosis through NP-cell interactions.
• Nanoconjugation of epidermal growth factor (EGF) enhances its apoptotic efficacy, but mechanisms and morphology dependence are unclear.

Purpose of the Study:

• To characterize the apoptotic efficacy of nanoconjugated EGF based on NP size, aspect ratio, and surface loading.
• To elucidate the underlying cellular mechanisms and NP-cell interactions involved in NP-EGF mediated apoptosis.

Main Methods:

• Synthesized and characterized nanoconjugated EGF with varying NP sizes (20-80 nm) and aspect ratios.
• Assessed apoptotic efficacy in EGFR-overexpressing MDA-MB-468 cells.
• Measured reactive oxygen species (ROS) levels, mitochondrial integrity, and glutathione homeostasis.
• Utilized EGFR inhibitors and antioxidants to investigate signaling pathways.

Main Results:

• Apoptotic efficacy showed significant dependence on NP size and morphology; ~80 nm spherical NPs were most potent.
• Nanoconjugated EGF induced EGFR-dependent cytoplasmic ROS increase, perturbing glutathione homeostasis.
• No significant mitochondrial ROS increase or membrane damage observed at early time points.
• EGFR inhibition and specific antioxidants (NAC, tempol) abrogated the apoptotic effect.

Conclusions:

• NP morphology critically influences EGF nanoconjugate-induced apoptosis, with larger spheres being more effective.
• The mechanism involves EGFR-mediated cytoplasmic ROS generation and glutathione homeostasis disruption.
• This study provides insights into NP-cell interactions and offers a model for morphology-dependent apoptosis induction.