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天津医科大学朱宪彝纪念医院检验科、天津市内分泌研究所、国家卫健委激素与发育重点实验室、 天津市代谢性疾病重点实验室,天津 300134
李 冲,Email:15122121545@163.com, 研究方向:主要从事糖尿病与雄性生殖相关研究。
牛文彦,Email:wyniu@139.com。
收稿:2023-05-21,
修回:2023-06-29,
录用:2023-09-06,
纸质出版:2023-11-28
移动端阅览
李冲,谢曦,王雅茹,等.2型糖尿病雄性小鼠生殖细胞形态学改变及凋亡机制研究[J].重庆医科大学学报,2023,48(11):1331-1336.
Li Chong,Xie Xi,Wang Yaru,et al.Influence of type 2 diabetes mellitus on the morphology and apoptosis of germ cells in male mice[J].Journal of Chongqing Medical University,2023,48(11):1331-1336.
李冲,谢曦,王雅茹,等.2型糖尿病雄性小鼠生殖细胞形态学改变及凋亡机制研究[J].重庆医科大学学报,2023,48(11):1331-1336. DOI: 10.13406/j.cnki.cyxb.003368.
Li Chong,Xie Xi,Wang Yaru,et al.Influence of type 2 diabetes mellitus on the morphology and apoptosis of germ cells in male mice[J].Journal of Chongqing Medical University,2023,48(11):1331-1336. DOI: 10.13406/j.cnki.cyxb.003368.
目的
2
通过构建2型糖尿病(type 2 diabetes mellitus,T2DM)雄性小鼠模型探究2型糖尿病对睾丸组织形态学、睾酮分泌、精子生成等方面的影响。
方法
2
将24只8周龄C57BL/6J雄性小鼠随机分为2组:对照组10只和T2DM组14只。对照组小鼠基础饲料喂养,T2DM组给予高脂喂养。8周后对照组小鼠腹腔注射柠檬酸盐缓冲液,T2DM组小鼠腹腔注射60 mg/kg链脲佐菌素(streptozocin,STZ),持续5 d。饲养小鼠4周后断颈处死,分离出小鼠的血清、睾丸、附睾。通过精子计数、睾酮水平检测评估雄性小鼠生殖细胞生精功能;HE染色分析睾丸组织形态学变化;TUNEL染色检测睾丸生殖细胞的凋亡情况。ELISA检测雄性小鼠血清中超氧化物歧化酶(superoxide dismutase,SOD)、丙二醛(malondialdehyde,MDA)、血红素加氧酶-1(heme oxygenase-1,HO-1)水平;Western blot检测雄性小鼠睾丸组织中B细胞淋巴瘤/白血病-2(B cell lymphoma/leukemia-2,Bcl-2)、Bcl-2相关X蛋白(Bcl-2-associated X protein,BaX)、半胱氨酸天冬氨酸蛋白酶-3(cysteinyl aspartate specific proteinase-3,Caspase-3)蛋白表达水平。
结果
2
与对照组相比,T2DM组小鼠体质量(26.00±2.85) g、精子数目(4.15±1.01)×10
6
个/L、睾酮水平(0.99±0.41) ng/mL均降低(
P
=0.000,
P
=0.009,
P
=0.041);TUNEL结果显示:T2DM组小鼠睾丸生精小管各级生精细胞都有不同程度的凋亡,凋亡细胞数量(21.60±5.11,
P
=0.033)增加;ELISA结果显示:T2DM组小鼠血清氧化应激SOD(4.42±0.47) pg/mL和HO-1(2 968.00±536.10) pg/mL表达水平增加(
P
=0.000,
P
=0.008)。Western blot检测发现BaX(1.270±0.059)、Caspase-3(1.94±0.47)蛋白表达水平增加(
P
=0.008,
P
=0.041),且BaX与Bcl-2比值增大。
结论
2
2型糖尿病雄性小鼠血清睾酮含量显著降低,生精细胞凋亡增加,成熟精子数量减少,影响生殖能力。
Objective
2
To investigate the influence of type 2 diabetes mellitus(T2DM) on testicular histomorphology,testosterone secretion,and spermatogenesis by establishing a male mouse model of T2DM.
Methods
2
A total of 24 male C57BL/6J mice,aged 8 weeks,were randomly divided into control group with 10 mice and T2DM group with 14 mice. The mice in the control group were fed a basal diet,and those in the T2DM group were fed a high-fat diet. After 8 weeks,the mice in the control group were given intraperitoneal injection of citrate buffer,and those in the T2DM group were given intraperitoneal injection of 60 mg/kg streptozotocin(STZ),for 5 consecutive days. The mice were sacrificed after 4 weeks of feeding,and the serum,testis,and epididymis of the male mice were isolated. Sperm count and testosterone level were measured to assess the spermatogenic function of germ cells in male mice;HE staining was used to observe the morphological changes of the testis;TUNEL staining was used to observe the apoptosis of testicular germ cells. ELISA was used to measure the serum levels of superoxide dismutase(SOD),malondialdehyde(MDA),and heme oxygenase-1(HO-1),and Western blot was used to measure the protein expression levels of B cell lymphoma/leukemia-2(Bcl-2),Bcl-2-associated X protein(BaX),and cysteinyl aspartate specific proteinase-3(caspase-3) in testicular tissue of male mice.
Results
2
Compared with the control group,the T2DM group had significant reductions in body weight [(26.00±2.85) g vs. (29.71±4.28) g,
P
=0.000
]
,sperm number [(4.15±1.01) ×10
6
/L vs. (5.56±0.70)×10
6
/L,
P
=0.009
]
,and testosterone level [(0.99±0.41) ng/mL vs. (19.85±10.23) ng/mL,
P
=0.041
]
. TUNEL staining showed that the T2DM group had varying degrees of apoptosis in spermatogenic cells at all levels of testicular seminiferous tubules,with a significant increase in the number of apoptotic cells(21.60±5.11,
P
=0.033). ELISA showed that the T2DM group had significant increases in the expression levels of the serum oxidative stress markers SOD(4.42±0.47) pg/mL and HO-1(2 968.00±536.10) pg/mL(
P
=0.000 and 0.008). Western blot showed significant increases in the protein expression levels of BaX(1.270±0.059) and caspase-3(1.94±0.47)(
P
=0.008 and 0.041) and BaX/Bcl-2 ratio.
Conclusion
2
Male mice with T2DM have a significant reduction in serum testosterone level,a significant increase in the apoptosis of spermatogenic cells,and a significant reduction in the number of mature spermatogenic cells,which affect reproductive capacity.
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