FT-IR characterization of a theranostic nanoprobe for photodynamic therapy and epidermal growth factor receptor targets

•Develop a bifunctional theranostic nanoprobe for breast cancer treatment.•Epidermal Growth Factor is a targeting agent.•The Chlorin e6 attached to nanoparticle carrier increases the pharmacokinetics.•Diagnostic and therapeutic complexes formation were characterized by FT-IR.•Promising nanoprobe for...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-03, Vol.240, p.903-908
Main Authors: Castilho, M.L., Hewitt, K.C., Raniero, L.
Format: Article
Language:English
Subjects:
Breast
Cancer
Cell death
Chlorin e6
Conjugation
Coordination compounds
Cysteamine
Epidermal growth factor
FT-IR
Gold
Gold nanoparticle
Growth factors
Infrared spectroscopy
Lipoic acid
Nanoparticles
Nanostructure
Organic chemistry
Photodynamic therapy
Photon correlation spectroscopy
Receptors
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Summary:•Develop a bifunctional theranostic nanoprobe for breast cancer treatment.•Epidermal Growth Factor is a targeting agent.•The Chlorin e6 attached to nanoparticle carrier increases the pharmacokinetics.•Diagnostic and therapeutic complexes formation were characterized by FT-IR.•Promising nanoprobe for photodynamic therapy for cells with EGFR overexpressed. Photodynamic Therapy (PDT) is an effective cancer treatment method based on light-activation of a photosensitizer in the presence of cellular oxygen. In an effort to develop a novel PDT agent for breast cancer treatment we report on the synthesis and characterization of a bifunctional theranostic nanoprobe; possessing both a photosensitizer agent (Chlorin e6) and tumor targeting agent – an Epidermal Growth Factor (EGF) complex which targets the EGF receptor. It’s effectiveness in arresting cancer cell growth was tested using the breast cancer cell line MDA-MB-468. FT-IR analysis confirms that carbodiimide chemistry was effective in creating covalent bonded complexes between the photosensitizer Chlorin e6 (Ce6) and cysteamine, and the EGF and α-lipoic acid, which exhibit excellent affinity for gold nanoparticles (AuNPs). In particular, for the Ce6-cysteamine complex FT-IR analysis shows peaks with significant increase in intensity at 1713, 1542, 2227cm−1 and a decrease at 941cm−1 and for the EGF-α-lipoic acid complex there are significant decreases in intensity at 1708, 1073, 947cm−1 and increases at 1542, 1680, 1108cm−1. These changes are consistent with the creation of amide bonds, loss of carboxylic acid, and modification of the NH and CO bonds. Conjugation of these complexes to AuNPs was confirmed by UV–vis and Dynamic Light Scattering experiments. MDA-MB-468 cells treated with the bifunctional nanoprobe exhibited similar cell death and mitochondrial activity at 10-fold smaller Ce6 concentrations when bound to AuNPs compared with free Ce6. In addition only half the exposure time was needed to achieve these effects compared with unbound Ce6.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.09.011