Abstract
Background
Vascular defects in the mechanical properties of aorta and muscular arteries have been previously reported in animals with copper-deficient feed. However, the interaction between copper nanoparticles (CuNPs) and mechanical properties of arteries has not been reported. Hence, the present study was aimed to evaluate the effect of copper nanoparticles on the vasoreactivity of rat isolated thoracic arteries.
Methods
In this study, 5 week old male Wistar rats were fed a copper-adequate diet (CuA, 6.5 mg copper/kg diet), copper-deficient diet (CuD) and copper-modified diets, enriched with copper as a salt (CuS) and as copper nanoparticles (CuNPs) of 40–60 nm in diameter.
Results
There was a strong relationship between CuNPs and CuS administration in the tensile strength of the thoracic aorta subjected to phenylephrine treatment in the concentration range of 10−7–10−5 M. This was also seen between CuNPs and the control diet in the same concentration ranges. In addition vasodilation induced by acetylcholine at the concentration range of 10−7–10−5 M was significantly reduced in CuD and NPs feed animals. In CuNPs fed rats, activities of Cu,Zn-SOD, CAT and copper concentration in cardiomyocytes were not influenced when compared with CuS control. In contrast, in CuS-low diet the activities of studied enzymes and copper concentration were pointing towards copper deficiency.
Conclusions
Our results demonstrate for the first time that the observed effects of copper administration in the form of NPs are attributed mainly to the NPs rather than copper itself. Thus another mechanism not related with Cu,Zn-SOD and CAT seems to be involved.
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Abbreviations
- CAT:
-
catalase
- CuA:
-
copper-adequate diet
- CuD:
-
copper-deficient diet
- CuNPs:
-
copper-nanoparticle diet
- CuS:
-
CuCO3 fed rats
- MMX:
-
mineral matrix
- NO:
-
nitric oxide
- O2−:
-
superoxide anion
- ROS:
-
reactive oxygen species
- SOD:
-
superoxide dismutase
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Majewski, M., Ognik, K., Zdunczyk, P. et al. Effect of dietary copper nanoparticles versus one copper (II) salt: Analysis of vasoreactivity in a rat model. Pharmacol. Rep 69, 1282–1288 (2017). https://doi.org/10.1016/j.pharep.2017.06.001
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DOI: https://doi.org/10.1016/j.pharep.2017.06.001