Quinone derivatives like 2-(4-hydroxyphenyl) amino-1,4-naphthoquinone (Q7) are used as antitumor agents usually associated with adverse effects on the cardiovascular system. The objective of this study was to evaluate the cardioprotective effect of ascorbate on Q7-induced cardiovascular response in Wistar rats. In this study, blood pressure, vascular reactivity, and intracellular calcium fluxes were evaluated in cardiomyocytes and the rat aorta. We also measured oxidative stress through lipid peroxidation (TBARS), superoxide dismutase- (SOD-) like activity, and H2O2 generation. Oral treatment of rats with ascorbate (500 mg\/kg) for 20 days significantly (p < 0.05) reduced the Q7-induced increase (10 mg\/kg) in blood pressure and heart rate. The preincubation with ascorbate (2 mM) significantly (p < 0.05) attenuated the irregular beating of the atrium induced by Q7 (10-5 M). In addition, ascorbate induced endothelial vasodilation in the presence of Q7 in the intact aortic rings of a rat and reduced the cytosolic calcium levels in vascular smooth muscle cells. Ascorbate also reduced the Q7-induced oxidative stress in vivo. Ascorbate also attenuated Q7-induced SOD-like activity and increased TBARS levels. These results suggest a cardioprotective effect in vivo of ascorbate in animals treated orally with a naphthoquinone derivative by a mechanism involving oxidative stress.\n\n\n
Javier Palacios,\u00a0Jos\u00e9 Miguel Fonseca,\u00a0Fernando Ayavire,\u00a0Felipe Salas,\u00a0Mirko Ortiz,\u00a0Juan Marcelo Sandoval,\u00a0Julio Benites,\u00a0Chukwuemeka R Nwokocha,\u00a0Ewaldo Zavala,\u00a0Adri\u00e1n Paredes,\u00a0Iv\u00e1n Barr\u00eda,\u00a0Jos\u00e9 Luis Vega,\u00a0Fredi Cifuentes<\/p>\n
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Summary Quinone derivatives like 2-(4-hydroxyphenyl) amino-1,4-naphthoquinone (Q7) are used as antitumor agents usually associated with adverse effects on the cardiovascular system. The objective of this study was to evaluate the cardioprotective effect of ascorbate on Q7-induced cardiovascular response in Wistar rats. In this study, blood pressure, vascular reactivity, and intracellular calcium fluxes were evaluated in…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[69],"tags":[545],"_links":{"self":[{"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/posts\/7208"}],"collection":[{"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/comments?post=7208"}],"version-history":[{"count":0,"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/posts\/7208\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/media?parent=7208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/categories?post=7208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.healthlibrary.info\/wp-json\/wp\/v2\/tags?post=7208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}