{"title":"Modulation effects of acid sphingomyelinase/ceramide on the common carotid arteries of simulated weightless rats","authors":"Yaoping Cheng, Xiao-ping Xie, L. Xue, Zhongchao Wang, Huan Liu, Hai-Jun Zhang, Yao-ming Chang","doi":"10.3760/CMA.J.ISSN.1007-6239.2015.01.001","DOIUrl":null,"url":null,"abstract":"Objective \nTo investigate the alteration of acid sphingomyelinase (ASM)/ ceramide (Cer) and its role in vasoconstriction of the common carotid arteries (CA) of simulated weightless rats. \n \n \nMethods \nThirty-six male Sprague-Dawley rats that matched for weight were randomly assigned to suspended group (n=18) and control group (n=18). Suspended group was in simulated weightless by tail suspension for 4 wk. Western blot and immunohistochemistry were conducted to examine the content and distribution of ASM and Cer. Isometric force recording system was used to detect the vasoconstriction and vasodilation functions. Dihydroethidium fluorescent probe was used to evaluate the level of superoxide anion () in arteries. \n \n \nResults \nFour-week suspension made the ASM protein and Cer level in the CA of suspended group significantly decreased as compared with that of control group (t=3.626-9.922, P<0.01 or <0.05), while vasoconstriction response to KCl and phenylephrine or vasodilation response to acetylcholine and sodium nitroprusside did not change much in two groups. Incubation with C6-ceramide (C6-Cer) did not significantly change the Cer level, vasoconstriction, vasodilation and level of CA in control group but increased Cer level, vasoconstriction response to KCl and level in suspended group (t=3.015-7.088, P<0.05). The suspension influenced less on vasodilation response to acetylcholine and sodium nitroprusside. \n \n \nConclusions \nSimulated weightlessness makes the drop on ASM/Cer level and the level in CA as well as its vasoconstriction adaptation. \n \n \nKey words: \nWeightlessness simulation; Carotid artery, common; Phospholipases; Ceramides; Oxidative stress; Rats, Sprague-Dawley","PeriodicalId":9904,"journal":{"name":"Chinese Journal of Aerospace Medicine","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2015-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Journal of Aerospace Medicine","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.3760/CMA.J.ISSN.1007-6239.2015.01.001","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
Objective
To investigate the alteration of acid sphingomyelinase (ASM)/ ceramide (Cer) and its role in vasoconstriction of the common carotid arteries (CA) of simulated weightless rats.
Methods
Thirty-six male Sprague-Dawley rats that matched for weight were randomly assigned to suspended group (n=18) and control group (n=18). Suspended group was in simulated weightless by tail suspension for 4 wk. Western blot and immunohistochemistry were conducted to examine the content and distribution of ASM and Cer. Isometric force recording system was used to detect the vasoconstriction and vasodilation functions. Dihydroethidium fluorescent probe was used to evaluate the level of superoxide anion () in arteries.
Results
Four-week suspension made the ASM protein and Cer level in the CA of suspended group significantly decreased as compared with that of control group (t=3.626-9.922, P<0.01 or <0.05), while vasoconstriction response to KCl and phenylephrine or vasodilation response to acetylcholine and sodium nitroprusside did not change much in two groups. Incubation with C6-ceramide (C6-Cer) did not significantly change the Cer level, vasoconstriction, vasodilation and level of CA in control group but increased Cer level, vasoconstriction response to KCl and level in suspended group (t=3.015-7.088, P<0.05). The suspension influenced less on vasodilation response to acetylcholine and sodium nitroprusside.
Conclusions
Simulated weightlessness makes the drop on ASM/Cer level and the level in CA as well as its vasoconstriction adaptation.
Key words:
Weightlessness simulation; Carotid artery, common; Phospholipases; Ceramides; Oxidative stress; Rats, Sprague-Dawley