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The attenuation of central angiotensin II-dependent pressor response and intra-neuronal signaling by intracarotid injection of nanoformulated copper/zinc superoxide dismutase

Paper ID Volume ID Publish Year Pages File Format Full-Text
8385 588 2010 9 PDF Available
Title
The attenuation of central angiotensin II-dependent pressor response and intra-neuronal signaling by intracarotid injection of nanoformulated copper/zinc superoxide dismutase
Abstract

Adenoviral-mediated overexpression of the intracellular superoxide (O2·−) scavenging enzyme copper/zinc superoxide dismutase (CuZnSOD) in the brain attenuates central angiotensin II (AngII)-induced cardiovascular responses. However, the therapeutic potential for adenoviral vectors is weakened by toxicity and the inability of adenoviral vectors to target the brain following peripheral administration. Therefore, we developed a non-viral delivery system in which CuZnSOD protein is electrostatically bound to a synthetic poly(ethyleneimine)–poly(ethyleneglycol) (PEI–PEG) polymer to form a polyion complex (CuZnSOD nanozyme). We hypothesized that PEI–PEG polymer increases transport of functional CuZnSOD to neurons, which inhibits AngII intra-neuronal signaling. The AngII-induced increase in O2·−, as measured by dihydroethidium fluorescence and electron paramagnetic resonance spectroscopy, was significantly inhibited in CuZnSOD nanozyme-treated neurons compared to free CuZnSOD- and non-treated neurons. CuZnSOD nanozyme also attenuated the AngII-induced inhibition of K+ current in neurons. Intracarotid injection of CuZnSOD nanozyme into rabbits significantly inhibited the pressor response of intracerebroventricular-delivered AngII; however, intracarotid injection of free CuZnSOD or PEI–PEG polymer alone failed to inhibit this response. Importantly, neither the PEI–PEG polymer alone nor the CuZnSOD nanozyme induced neuronal toxicity. These findings indicate that CuZnSOD nanozyme inhibits AngII intra-neuronal signaling in vitro and in vivo.

Keywords
Brain; Superoxide dismutase; Nanotechnology; Drug delivery; Copolymer; Potassium current
First Page Preview
The attenuation of central angiotensin II-dependent pressor response and intra-neuronal signaling by intracarotid injection of nanoformulated copper/zinc superoxide dismutase
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 31, Issue 19, July 2010, Pages 5218–5226
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering