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Heterozygous SOD1 deficiency in mice with an NZW background causes male infertility and an aberrant immune phenotype.
Free Radical Research ( IF 3.3 ) Pub Date : 2019-10-24 , DOI: 10.1080/10715762.2019.1677901
Takujiro Homma 1 , Yuji Takeda 2 , Satoshi Sakahara 3 , Naoki Ishii 1 , Sho Kobayashi 1 , Hiroyuki Abe 3 , Hironobu Asao 2 , Junichi Fujii 1
Affiliation  

New Zealand white (NZW) mouse is a mutant strain that has a larval defect in the immune system, and a F1 hybrid between NZW and New Zealand Black mouse spontaneously develops systemic lupus erythematosus (SLE). In meantime, the ablation of superoxide dismutase 1 (Sod1) causes autoimmune haemolytic anaemia, a clinical condition of SLE, in mice with a C57BL/6 background. On the basis of our previous studies, we hypothesised that oxidative stress may trigger this aberrant autoimmunity in NZW mice without crossing with another strain. To validate this, we attempted to establish Sod1-/-/NZW mice but this attempt failed to obtain any objective mouse. The congenic Sod1+/-/NZW male mice were completely infertile because of severe oligozoospermia attributed to a defect in spermatogenesis. The levels of the SOD1 protein were about a half in the testes of the Sod1+/-/NZW mice. Sperm from the Sod1+/-/NZW mice were largely defective and showed quite low fertilising ability in in vitro fertilisation assays. Concomitant with an increase in the oxidatively modified proteins, spermatogenic cells underwent more cell death in the testes of the Sod1+/-/NZW mice compared to those of WT/NZW mice. An examination of immunocompetent cells from Sod1+/-/NZW mice indicated an abnormality in T-cell responses. These collective results suggest that the oxidative stress caused by an SOD1 haploinsufficiency exerts deleterious effects on the testis, either directly on spermatogenic cells or via the destabilisation of the autoimmune response in Sod1+/-/NZW mice.

中文翻译:

具有NZW背景的小鼠中的杂合子SOD1缺乏会导致男性不育和异常的免疫表型。

新西兰白(NZW)小鼠是在免疫系统中具有幼虫缺陷的突变株,NZW和新西兰黑小鼠之间的F1杂种自发发展为系统性红斑狼疮(SLE)。同时,消融超氧化物歧化酶1(Sod1)在具有C57BL / 6背景的小鼠中引起自身免疫性溶血性贫血,这是SLE的临床症状。根据我们以前的研究,我们假设氧化应激可能会触发NZW小鼠这种异常的自身免疫,而不会与另一株杂交。为了验证这一点,我们尝试建立Sod1-/-/ NZW小鼠,但这种尝试未能获得任何目标小鼠。由于严重的少精子症(归因于精子发生的缺陷),同基因的Sod1 + /-/ NZW雄性小鼠完全不育。在Sod1 + /-/ NZW小鼠的睾丸中,SOD1蛋白的水平约为一半。来自Sod1 + /-/ NZW小鼠的精子在很大程度上是有缺陷的,并且在体外受精测定中显示出相当低的受精能力。与氧化修饰蛋白的增加相伴,与WT / NZW小鼠相比,Sod1 + /-/ NZW小鼠的睾丸中生精细胞发生更多的细胞死亡。对来自Sod1 + /-/ NZW小鼠的免疫活性细胞的检查表明T细胞反应异常。这些共同的结果表明,由SOD1单倍体不足引起的氧化应激直接对生精细胞或通过使Sod1 + /-/ NZW小鼠自身免疫反应不稳定而对睾丸产生有害影响。来自Sod1 + /-/ NZW小鼠的精子在很大程度上是有缺陷的,并且在体外受精测定中显示出相当低的受精能力。与氧化修饰蛋白的增加相伴,与WT / NZW小鼠相比,Sod1 + /-/ NZW小鼠的睾丸中生精细胞发生更多的细胞死亡。对来自Sod1 + /-/ NZW小鼠的免疫活性细胞的检查表明T细胞反应异常。这些共同的结果表明,由SOD1单倍体不足引起的氧化应激直接对生精细胞或通过使Sod1 + /-/ NZW小鼠自身免疫反应不稳定而对睾丸产生有害影响。来自Sod1 + /-/ NZW小鼠的精子在很大程度上是有缺陷的,并且在体外受精测定中显示出相当低的受精能力。与氧化修饰蛋白的增加相伴,与WT / NZW小鼠相比,Sod1 + /-/ NZW小鼠的睾丸中生精细胞发生更多的细胞死亡。对来自Sod1 + /-/ NZW小鼠的免疫活性细胞的检查表明T细胞反应异常。这些共同的结果表明,由SOD1单倍体不足引起的氧化应激直接对生精细胞或通过使Sod1 + /-/ NZW小鼠自身免疫反应不稳定而对睾丸产生有害影响。与WT / NZW小鼠相比,Sod1 + /-/ NZW小鼠的睾丸生精细胞死亡更多。对来自Sod1 + /-/ NZW小鼠的免疫活性细胞的检查表明T细胞反应异常。这些共同的结果表明,由SOD1单倍体不足引起的氧化应激直接对生精细胞或通过使Sod1 + /-/ NZW小鼠自身免疫反应不稳定而对睾丸产生有害影响。与WT / NZW小鼠相比,Sod1 + /-/ NZW小鼠的睾丸生精细胞死亡更多。对来自Sod1 + /-/ NZW小鼠的免疫活性细胞的检查表明T细胞反应异常。这些共同的结果表明,由SOD1单倍体不足引起的氧化应激直接对生精细胞或通过使Sod1 + /-/ NZW小鼠自身免疫反应不稳定而对睾丸产生有害影响。
更新日期:2019-11-01
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