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Comparative hyperthermia effects of silica–gold nanoshells with different surface coverage of gold clusters on epithelial tumor cells

Authors Park S, Lee J, Lee T, Bae S, Kang B, Huh Y, Lee S, Haam S, An SSA

Received 10 May 2015

Accepted for publication 20 July 2015

Published 10 September 2015 Volume 2015:10(Special Issue on diverse applications in Nano-Theranostics) Pages 261—271

DOI https://doi.org/10.2147/IJN.S88309

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Govarthanan Muthusamy

Peer reviewer comments 3

Editor who approved publication: Prof. Dr. Thomas J Webster


Sang-Eun Park,1,* Jaewon Lee,2,* Taeksu Lee,2 Saet-Byeol Bae,1 Byunghoon Kang,2 Yong-Min Huh,3 Sang-Wha Lee,1 Seungjoo Haam,2

1Department of Chemical and Biochemical Engineering, Gachon University, Gyeonggi-Do, Republic of Korea; 2Department of Chemical Engineering, Yonsei University, Seoul, Republic of Korea; 3Department of Radiology, College of Medicine, Yonsei University, Seoul, Republic of Korea

*These authors contributed equally to this work

Abstract: Silica–gold nanoshell (SGNS), which is a silica core surrounded by a gold layer, was synthesized by seed-mediated coalescence of gold clusters in an electroless plating solution. SGNS variations with different surface coverage of gold clusters were prepared by adjusting the amounts of gold salts in the presence of formaldehyde-reducing agents. Fully covered SGNS (f-SGNS) with connected gold clusters exhibited stronger intensity and more redshift of plasmon bands located around 820 nm than those of partially covered SGNS (p-SGNS) with disconnected gold clusters. Upon irradiation with near-infrared light (30 W/cm2, 700–800 nm), f-SGNS caused a larger hyperthermia effect, generating a large temperature change (ΔT =42°C), as compared to the relatively small temperature change (ΔT =24°C) caused by p-SGNS. The therapeutic antibody, Erbitux™ (ERB), was further conjugated to SGNS for specific tumor cell targeting. The f-ERB-SGNS showed excellent therapeutic efficacy based on the combined effect of both the therapeutic antibody and the full hyperthermia dose under near-infrared irradiation. Thus, SGNS with well-controlled surface morphology of gold shells may be applicable for near-infrared-induced hyperthermia therapy with tunable optical properties.

Keywords: gold nanoshell, plasmon resonance, Erbitux, human epithelial cancer, hyperthermia

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