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. 2021 Apr 14;11:8183. doi: 10.1038/s41598-021-87791-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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The effect of sodium nitrite on the intracellular NO and cyclic guanine monophosphate (cGMP) concentrations. (A–C) Sodium nitrite in the culture medium resulted in mild increase of intracellular NO concentration after 24 (A), 48 (B) and 72 h (C) incubation. Addition of 2-4-carboxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO, 10 μM) in the culture medium scavenged NO and decreased intracellular NO concentration. (D) cGMP increased with the addition of sodium nitrite and addition of cPTIO blunted cGMP generation. *p < 0.05, **p < 0.01, ^###p < 0.001.