Beyond electrostatic interactions: Ligand shell modulated uptake of bis-conjugated iron oxide nanoparticles by cells

Author(s)

Cardoso, Roberta M. ^[1] ; Deda, Daiana K. ^[1] ; Toma, Sergio H. ^[1] ; Baptista, Mauricio S. ^[2] ; Araki, Koiti ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Inst Chem, Dept Biochem, Ave Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: COLLOIDS AND SURFACES B-BIOINTERFACES; v. 186, FEB 2020.
• Web of Science Citations: 0

Abstract

The effect of the ligand shell on the cellular uptake efficiency was evaluated by a systematic study using fully dispersed 6 nm diameter superparamagnetic iron oxide nanoparticles (SPIONs), mono and bis-conjugated with glycerol phosphate (glyc), dopamine (dopa), 4,5-dihydroxy-1,3-benzenedisulfonic acid (tiron) and phosphorylethanolamine (pea). Negatively charged SPION-glyc was more efficiently incorporated than positively charged SPION-pea and SPION-dopa clearly evidencing that there are strong enough short-range interactions in addition to the long-range electrostatic interactions, as measured by the zeta potential, to reverse our expectation on cellular uptake. Those effects were pursued by correlating the nanoparticles incorporation efficiency as a function of the respective zeta potentials and the molar fractions of glyc and pea ligands co-conjugated on the SPION surface. The possibility of associating different ligands to modulate the physicochemical properties and biological events was demonstrated, showing promising perspectives for the development of multifunctional nanosystems for biomedical applications. (AU)

• FAPESP's process: 13/24725-4 - Supramolecular chemistry and nanotechnology
• Grantee: Henrique Eisi Toma
• Support Opportunities: Research Projects - Thematic Grants