# Gold Nanorods Embedded in Mesoporous Silica for Photothermal Therapy and SERS Monitoring in T47D Breast Cancer Cells

## TL;DR

Researchers developed a nanoshell platform that safely heats and monitors breast cancer cells using gold nanorods and Raman spectroscopy.

## Contribution

A theranostic platform combining photothermal therapy and SERS monitoring for controlled cancer treatment.

## Key findings

- AuNR@Si nanoshells maintained a stable therapeutic temperature range (41–45 °C) during photothermal treatment.
- The platform reduced T47D breast cancer cell viability by 33% and enabled SERS monitoring of cellular damage.
- SERS identified biochemical fingerprints of protein denaturation, cytochrome c release, and DNA fragmentation.

## Abstract

Background: The development of plasmonic photothermal therapy (PPTT) to trigger cancer cells is often hindered by uncontrolled overheating and the lack of real-time feedback. Methods: In this study, we report the synthesis of gold nanorod-embedded mesoporous silica nanoshells (AuNR@Si) as a multifunctional theranostic platform designed for controlled hyperthermia and surface-enhanced Raman spectroscopy (SERS) monitoring. Using a layer-by-layer templating strategy, AuNRs were successfully obtained within a hollow silica architecture. Results: While AuNRs alone exhibited rapid photothermal spikes reaching 64 °C, the AuNR@Si platform moderated the photothermal response, maintaining a stable therapeutic window (41–45 °C). In vitro assays using T47D breast cancer cells demonstrated a 33% reduction in viability following irradiation. Furthermore, the structural stability of the AuNR@Si platform enabled SERS monitoring of cellular damage, identifying specific biochemical fingerprints of protein denaturation, cytochrome c release and DNA fragmentation. Conclusions: These results suggest that AuNR@Si nanoshells provide a safer, regulated approach to photothermal ablation with the added benefit of molecular detection, demonstrating proof-of-concept theranostic functionality in a luminal breast cancer model.