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In the current study, we aimed to investigate whether NADPH oxidase, a major ROS-producing enzyme, was involved in the antioxidant effect of acupuncture on cognitive impairment after cerebral ischaemia. The cognitive function, infract size, neuron cell loss, level of superoxide anion and expression of NADPH oxidase subunit in hippocampus of two-vessel occlusion (2VO) rats were determined after 2-week acupuncture. Furthermore, the cognitive function and production of O2− were determined in the presence and absence of NADPH oxidase agonist (TBCA) and antagonist (Apocynin). The effect of acupuncture on cognitive function after cerebral ischaemia in gp91phox-KO mice was evaluated by Morris water maze. Acupuncture reduced infarct size, attenuated overproduction of O2− and reversed consequential cognitive impairment and neuron cell loss in 2VO rats. The elevations of gp91phox and p47phox after 2VO were significantly decreased after acupuncture treatment. However, no differences of gp91phox mRNA were found among any experimental groups. Furthermore, these beneficial effects were reversed by TBCA, whereas apocynin mimicked the effect of acupuncture by improving cognitive function and decreasing O2− generation. Acupuncture failed to improve the memory impairment in gp91phox KO mice. Full function of the NADPH oxidase enzyme plays an important role in neuroprotective effects against cognitive impairment via inhibition of NAPDH oxidase-mediated oxidative stress. [ABSTRACT FROM AUTHOR]

After publication of this Article concerns have been raised about the overlap of Figure 1 with another article from the authors, which was not cited in the Article[1]. Retraction of: I Scientific Reports i https://doi.org/10.1038/srep17981, published online 10 December 2015 The Editors have retracted this Article. [Extracted from the article]

Data presented in Figure 1A was previously reported by the authors in Figure 1A of Reference[1], which is not cited in the Article. Correction to: I Scientific Reports i https://doi.org/10.1038/srep17981, published online 10 December 2015 This Article contains errors. [Extracted from the article]