killing her2+ bc cells via use of herceptin-directd nanomolecules, hyperthermia!

[Lani]

At AACR advances in bc they discussed combining radiation therapy with hyperthermia induced by use of near infrared light, herceptin conjugated
gold nanoparticles, with heting only being mild and done once

Here is a slightly different proposal:

Int J Hyperthermia. 2011;27(7):682-97.
Herceptin-directed nanoparticles activated by an alternating magnetic field selectively kill HER-2 positive human breast cells in vitro via hyperthermia.
Zhang J, Dewilde AH, Chinn P, Foreman A, Barry S, Kanne D, Braunhut SJ.
Source
Department of Biological Sciences, University of Massachusetts , Lowell , Massachusetts.
Abstract
Purpose: HER-2 is in the EGF tyrosine kinase receptor family, overexpressed by many human cancers and minimally expressed by normal adult tissues. HER-2 expression in human cancers is correlated with reduced survival, increased metastasis, reduced apoptosis and increased proliferation. Herceptin is a humanised mouse antibody that targets and inactivates HER-2. In the present study, Herceptin was used to deliver ferric oxide-enriched nanoparticles to HER-2(+) cancer cells. If exposed to alternating magnetic field (AMF), the nanoparticles heat. We tested the ability of AMF-activated Herceptin-directed nanoparticles to selectively kill HER-2(+) human cancer cells. Methods: Herceptin-conjugated nanoparticles were incubated with normal human mammary epithelial cells (HMEC)(HER-2(-)) or malignant human mammary epithelial cells (SK-BR-3)(HER-2(+)). Cells were stained to detect Herceptin or iron and the kinetics of binding quantified. Once conditions were optimised for binding, cells were exposed to either antibody-directed or non-antibody-conjugated nanoparticles, washed and sham-treated or exposed to AMF and cell death quantified. Results: SK-BR-3 cells bound Herceptin-directed nanoparticles in increasing amounts over 3 h but did not retain non-antibody conjugated nanoparticles. HMECs did not retain either nanoparticles. SK-BR-3 cells with bound Herceptin-directed-nanoparticles, exposed to AMF, died by apoptosis, quantifiable by Live/Dead and nuclear morphology assays and released LDH. Sham-treated SK-BR-3 cells with Herceptin-directed nanoparticles, HMECs with either nanoparticles, with or without AMF treatment, exhibited no increase in toxicity above baseline cell death using these three assays. Conclusions: These studies demonstrate Herceptin-directed nanoparticles can selectively kill HER-2(+) cancer cells via hyperthermia after AMF activation.

PMID: 21992561