Fluorescence-Based Nano-Oxygen Particles for Spatiometric Monitoring of Cell Physiological Conditions



Koduri, Manohar Prasad, Goudar, Venkanagouda S, Shao, Yu-Wei, Hunt, John A ORCID: 0000-0002-5168-4778, Henstock, James R, Curran, Judith ORCID: 0000-0003-1551-2917 and Tseng, Fan Gang
(2018) Fluorescence-Based Nano-Oxygen Particles for Spatiometric Monitoring of Cell Physiological Conditions. ACS APPLIED MATERIALS & INTERFACES, 10 (36). 30163 - 30171.

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Abstract

Closed-loop artificial pancreas systems have recently been proposed as a solution for treating stage I diabetes by reproducing the function of the pancreas. However, there are many unresolved issues associated with their development, including monitoring and controlling oxygen, immune responses, and the optimization of glucose, all of which need to be monitored and controlled to produce an efficient and viable artificial organ that can become integrated in the patient and maintain homeostasis. This research focused on monitoring the oxygen concentration, specifically achieving this kinetically as the oxygen gradient in an artificial pancreas made of alginate spheres containing islet cells. Functional nanoparticles (NPs) for measuring the oxygen gradient in different hydrogel cellular environments using fluorescence-based (F) microscopy were developed and tested. By the ester bond, a linker Pluronic F127 was conjugated with a carboxylic acid-modified polystyrene NP (510 nm). A hydrophilic/hydrophobic interaction between the commercially available oxygen-sensitive fluorophore and F127 results in fluorescence-based nano-oxygen particles (FNOPs). The in-house synthesized FNOP was calibrated inside electrosprayed alginate-filled hydrogels and demonstrated a good broad dynamic range (2.73–22.23) mg/L as well as a resolution of −0.01 mg/L with an accuracy of ±4%. The calibrated FNOP was utilized for continuous measuring of the oxygen concentration gradient for cell lines RIN-m5F/HeLa for more than 5 days in alginate hydrogel spheres in vitro.

Item Type: Article
Uncontrolled Keywords: biosensors, fluorescence, HeLa cells, oxygen sensor, optical sensors, RIN-m5F, encapsulation, oxygen, cells, hydrogels, materials
Depositing User: Symplectic Admin
Date Deposited: 26 Sep 2018 10:21
Last Modified: 16 Aug 2022 03:11
DOI: 10.1021/acsami.8b10715
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3026764