The isoform lactate dehydrogenase C (LDHC) has a major role in improving stallion spermatozoa incubated in pyruvate-based media

IF 1.3 3区 农林科学 Q2 VETERINARY SCIENCES
E. da Silva Álvarez, L. Becerro Rey, F.E. Martin Cano, A. Silva Rodríguez, C. Ortega Ferrusola, G. Gaitskell-Phillips, M.C. Gil Anaya, F.J. Peña Vega
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引用次数: 0

Abstract

Stallion spermatozoa use different energy sources; while oxidative phosphorylation predominates, glycolysis and beta-oxidation of fatty acids are also important. Moreover, interactions among different pathways are of major importance. Glycolysis depends on the availability of NAD+ electron acceptor, which is reduced to NADH, that in the complex I of the electron transport chain (ETC) donates an electron regenerating NAD+. On the other hand, if mitochondria are damaged, regeneration of NAD+ may be reduced leading to reduced glycolysis further altering sperm metabolism. However, alternative ways to regenerate NAD+ may be present. We hypothesized that aerobic glycolysis is present in the stallion spermatozoa, constituting a backup mechanism to regenerate NAD+. To test this hypothesis, we incubated stallion spermatozoa in different media, including a high glucose media of 67 mM with 1 mM pyruvate and 10 mM glucose with 10 mM pyruvate. The addition of 10 mM pyruvate to the 67mM glucose media improved sperm motility (P<0.001) Aliquots extended in the high glucose media (67 mM glucose) after 3 h of incubation at 37°C experienced a significant drop in motility respect initial values (58.1 ± 1.8% vs 81.2 ± 1.8%; P<0.0001), while aliquots incubated in the 67mM glucose 10 mM pyruvate media, maintained the motility all along the incubation period (77.1± 1.4%), viability and mitochondrial membrane potential were also improved (P<0.001). We studied the metabolic proteome and metabolome using UHPLC/MS/M and identified for the first time three different isoforms of the enzyme lactate dehydrogenase (LDH), LDHA (cytosolic), LDHB (mitochondrial, with higher affinity for pyruvate), and LDHC (cytosol, motile cilium), the latter was the predominant isoform detected. We performed a custom analysis of the stallion sperm proteome using human orthologs in Metascape (https://metascape.org/gp/index.html#/main/step1), using the terms “pyruvate” and “lactate” to study its enrichment. Both terms were highly enriched in the stallion spermatozoa; LACTATE p= 1.7 × 1e-13 and PYRUVATE p=4.2 xe-13. Metabolic analysis showed that including 10 mM pyruvate, induced aerobic glycolysis as increased amounts of Lactate and NAD+ were detected. We concluded that activation of aerobic glycolysis in a high glucose media improves sperm survival through the regeneration of NAD+.
乳酸脱氢酶C (LDHC)在丙酮酸培养基中培养种马精子中起着重要作用
种马精子利用不同的能量来源;虽然氧化磷酸化占主导地位,糖酵解和脂肪酸的β -氧化也很重要。此外,不同途径之间的相互作用也非常重要。糖酵解依赖于NAD+电子受体的可用性,它被还原为NADH,在电子传递链(ETC)的复合体I中提供电子再生NAD+。另一方面,如果线粒体受损,NAD+的再生可能会减少,导致糖酵解减少,进一步改变精子代谢。然而,可能存在再生NAD+的替代方法。我们假设在种马精子中存在有氧糖酵解,构成再生NAD+的备用机制。为了验证这一假设,我们在不同的培养基中培养种马精子,包括67 mM的高葡萄糖培养基和1 mM的丙酮酸,以及10 mM的葡萄糖和10 mM的丙酮酸。在67mM葡萄糖培养基中添加10 mM丙酮酸提高了精子活力(P<0.001)。37°C孵育3小时后,等量的高糖培养基(67 mM葡萄糖)中精子活力显著下降(58.1±1.8% vs 81.2±1.8%);(P< 0.0001),而在67mM葡萄糖- 10 mM丙酮酸培养基中孵育的同种细胞在整个孵育期间保持运动性(77.1±1.4%),活力和线粒体膜电位也有所提高(P<0.001)。利用UHPLC/MS/M技术对其代谢蛋白质组和代谢组进行了研究,首次鉴定出乳酸脱氢酶(LDH)、LDHA(细胞质)、LDHB(线粒体,对丙酮酸具有较高亲和力)和LDHC(细胞质,运动纤毛)三种不同的异构体,后者是检测到的优势异构体。我们使用metscape (https://metascape.org/gp/index.html#/main/step1)上的人类同源物对种马精子蛋白质组进行了定制分析,使用术语“丙酮酸”和“乳酸”来研究其富集。这两个术语在种马精子中都高度富集;LACTATE p= 1.7 × 1e-13, PYRUVATE p=4.2 xe-13。代谢分析表明,随着乳酸和NAD+的增加,包括10 mM丙酮酸,诱导有氧糖酵解。我们得出结论,在高糖培养基中激活有氧糖酵解可以通过NAD+的再生提高精子的存活率。
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来源期刊
Journal of Equine Veterinary Science
Journal of Equine Veterinary Science 农林科学-兽医学
CiteScore
2.70
自引率
7.70%
发文量
249
审稿时长
77 days
期刊介绍: Journal of Equine Veterinary Science (JEVS) is an international publication designed for the practicing equine veterinarian, equine researcher, and other equine health care specialist. Published monthly, each issue of JEVS includes original research, reviews, case reports, short communications, and clinical techniques from leaders in the equine veterinary field, covering such topics as laminitis, reproduction, infectious disease, parasitology, behavior, podology, internal medicine, surgery and nutrition.
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