胱氨酸
谷胱甘肽
氧化还原
半胱氨酸
谷胱甘肽二硫化物
化学
硫醇
氧化剂
内科学
内分泌学
生物化学
生物
医学
酶
无机化学
有机化学
作者
Walter H. Watson,John Caleb Greenwell,Yu Zheng,Stephen Furmanek,Edilson Torres-González,Jeffrey D. Ritzenthaler,Jesse Roman
标识
DOI:10.1016/j.jnutbio.2020.108431
摘要
Age, sex and diet are well-established risk factors for several diseases. In humans, each of these variables has been linked to differences in plasma redox potentials (Eh) of the glutathione/glutathione disulfide (GSH/GSSG) and cysteine/cystine (Cys/CySS) redox couples. Mice have been very useful for modeling human disease processes, but it is unknown if age, sex and diet affect redox couples in mice as they do in humans. The purpose of the present study was to examine the effects of these factors on plasma redox potentials in C57BL/6J mice. We found that age had no effect on either redox couple in either sex. Plasma Eh Cys/CySS and Eh GSH/GSSG were both more oxidized (more positive) in females than in males. A 24-hour fast negated the sex differences in both redox potentials by oxidizing both redox couples in male mice, while having no effect on Eh Cys/CySS and a smaller effect on Eh GSH/GSSG in female mice. A diet with excess sulfur amino acids reduced the plasma Eh Cys/CySS in females to a level comparable to that seen in male mice. Thus, sex-specific differences in plasma Eh Cys/CySS could be normalized by two different dietary interventions. Some of these findings are consistent with reported human studies, while others are not. Most strikingly, mice do not exhibit age-dependent oxidation of plasma redox potentials. Care must be taken when designing and interpreting mouse studies to investigate redox regulation in humans.
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