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Depalo N, Corricelli M, De Paola I, Valente G, Iacobazzi RM, Altamura E, Debellis D, Comegna D, Fanizza E, Denora N, Laquintana V, Mavelli F, Striccoli M, Saviano M, Agostiano A, Del Gatto A, Zaccaro L, Curri ML. NIR Emitting Nanoprobes Based on Cyclic RGD Motif Conjugated PbS Quantum Dots for Integrin-Targeted Optical Bioimaging. ACS Appl Mater Interfaces 2017; 9:43113-43126. [PMID: 29148709 DOI: 10.1021/acsami.7b14155] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Here, silica-coated PbS quantum dots (QDs) with photoluminescence emission properties in the near-infrared (NIR) region are proposed as potential effective single particle optical nanoprobes for future in vivo imaging of tumors. The dispersibility in aqueous medium of hydrophobic PbS QDs was accomplished by growing a silica shell on their surface by exploiting a base assisted water-in-oil microemulsion method. The silica-coated PbS QDs were then conjugated with a specifically designed cyclic arginine-glycine-aspartic acid (cRGD) peptide that is able to specifically recognize αvβ3 integrins, which are overexpressed in angiogenic tumor-induced vasculatures and on some solid tumors, to achieve tumor-specific targeting. The cRGD peptide PbS silica-coated QDs were systematically characterized, at each step of their preparation, by means of complementary optical and structural techniques, demonstrating appropriate colloidal stability and the maintenance of their optical futures in aqueous solutions. The cellular uptake of cRGD peptide functionalized luminescent nanostructures in human melanoma cells, where overexpression of αvβ3 was observed, was assessed by means of confocal microscopy analysis and cytometric study. The selectivity of the cRGD peptide PbS silica-coated QDs for the αvβ3 integrin was established, consequently highlighting the significant potential of the developed NIR emitting nanostructures as optically traceable nanoprobes for future αvβ3 integrin receptor in vivo targeting in the NIR region.
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Affiliation(s)
- N Depalo
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
| | - M Corricelli
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
| | - I De Paola
- Istituto di Biostrutture e Bioimmagini-CNR , Via Mezzocannone 16, 80134 Napoli, Italy
| | - G Valente
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
| | - R M Iacobazzi
- Istituto Tumori IRCCS Giovanni Paolo II , Viale Orazio Flacco 65, 70124 Bari, Italy
| | | | | | - D Comegna
- Istituto di Biostrutture e Bioimmagini-CNR , Via Mezzocannone 16, 80134 Napoli, Italy
| | - E Fanizza
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
| | - N Denora
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
| | | | | | - M Striccoli
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
| | - M Saviano
- Istituto di Cristallografia-CNR Bari , Via Amendola 122/O, 70126 Bari, Italy
| | - A Agostiano
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
| | - A Del Gatto
- Istituto di Biostrutture e Bioimmagini-CNR , Via Mezzocannone 16, 80134 Napoli, Italy
| | - L Zaccaro
- Istituto di Biostrutture e Bioimmagini-CNR , Via Mezzocannone 16, 80134 Napoli, Italy
| | - M L Curri
- Istituto per i Processi Chimico-Fisici-CNR SS Bari , Via Orabona 4, 70125 Bari, Italy
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