Effects of arginine and trehalose on post-thawed bovine sperm quality

The present study was conducted to examine the protective role of arginine and trehalose on post-thaw bull sperm and oxidative stress parameters. Five ejaculates for each bull were used in the study. Each ejaculate, split into three equal aliquots and diluted at 37 °C with base extenders containing 2 mM arginine, 25 mM trehalose and no antioxidant (control) was cooled to 5 °C and then frozen. Frozen straws were thawed in a water bath for evaluation. Supplementation of the semen extender with arginine decreased the percentages of post-thawed subjective motility (29 ± 8.21%), CASA motility (12.2 ± 5.69%) and progressive motility (3.52 ± 2.13%), compared with the controls (43 ± 2.73%, 55.4 ± 6.78% and 33.48 ± 4.14%, respectively, P < 0.05). Supplementation of the semen extender with trehalose produced a higher mitochondrial activity and sperm viability (36.3 ± 3.99% and 44.1 ± 2.18%) compared with the control (13 ± 8.15 and 31.7 ± 3.94%, respectively, P < 0.05). It was established that trehalose (95.1%) and arginine (92.8%) protect DNA integrity compared to the control (90.4%) (P < 0.05). Trehalose supplementation in semen extenders provided great benefit in terms of viability, mitochondrial activity, and intact sperm DNA on frozen-thawed bull sperm.

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26 Baobab oil supplemented extender preserves post-thaw bull sperm quality parameters

Reproduction Fertility and Development ◽

10.1071/rdv32n2ab26 ◽

2020 ◽

Vol 32 (2) ◽

pp. 139

Author(s):

Z. Raphalalani ◽

F. Ramukhithi ◽

R. Ndhlala ◽

K. Nephawe ◽

T. Nedambale

Keyword(s):

Sperm Quality ◽

Membrane Integrity ◽

Quality Parameters ◽

Control Group ◽

Dna Integrity ◽

Sperm Dna ◽

Frozen Semen ◽

Morphological Defects ◽

Bull Sperm ◽

Semen Extender

The processes of semen cryopreservation and thawing affect sperm membrane integrity and motility and increases morphological defects as well as DNA damage. The most influential cause of this is oxidative stress. When endogenous antioxidant capacity of seminal plasma is reduced during the freeze-thawing process, plant extracts exhibiting strong antioxidant activity can be used as supplements for compensation. Baobab oil has gained interest because it is rich in powerful antioxidants, which could protect sperm cells from oxidative damage during cryopreservation. Our study aimed to assess the effects of baobab oil on post-thaw sperm quality parameters in an egg-yolk-based extender. Thirty semen ejaculates were collected from 15 Nguni bulls using an electro ejaculator. Semen samples were randomly allocated to control (no baobab oil), 20μL (1%), 50μL (2.5%), and 100μL (5%) baobab oil per millilitre extender. Following dilution, semen samples were loaded into 0.25-mL semen straws, equilibrated for 4h at 5°C, and transferred into a controlled rate programmable freezer. The frozen semen straws were stored in a liquid nitrogen tank (−196°C) until thawing. Semen straws were thawed (37°C/60 minutes) after 1 week of cryopreservation and analysed for (1) sperm motility using a computer-aided sperm analyser, (2) morphological defects and viability using eosin-nigrosin stain, (3) membrane integrity by hypo-osmotic swelling test, and (4) DNA integrity by terminal deoxynucleotidyl transferase dUTP nick end labelling assay. Data was analysed using analysis of variance. Treatment means were compared in relation to the control group by Dunnett's test. We found that supplementing semen extender with baobab oil at 1% significantly (P<0.05) preserved sperm DNA integrity (88.3±3.7) and membrane integrity (74.0±4.2) when compared with the control group (71.7±3.7 and 55.8±4.4, respectively). Baobab oil supplementation either at 1% (5.9±0.5), 2.5% (7.2±0.5), or 5% (6.0±0.5) significantly reduced sperm morphological defects compared with control (9.5±0.5). Total motility (1% (72.7%), 2.5% (72.7%), 5% (71.9%), control (59.3%)) and viability (1% (79.1%), 2.5% (79.8%), 5% (77.8%), control (67.6%)) were also improved by supplementation; however, the difference was not significant. In conclusion, it was demonstrated that supplementing bull semen extender with 1% baobab oil protects sperm from morphological defects, maintains membrane integrity, as well as preserves sperm DNA. All the baobab oil supplementation levels preserved post-thaw bull-sperm quality parameters.

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Effects of various cryoprotectants on bull sperm quality, DNA integrity and oxidative stress parameters

Cryobiology ◽

10.1016/j.cryobiol.2012.10.006 ◽

2013 ◽

Vol 66 (1) ◽

pp. 38-42 ◽

Cited By ~ 42

Author(s):

Umut Taşdemir ◽

Serhat Büyükleblebici ◽

Pürhan Barbaros Tuncer ◽

Erdem Coşkun ◽

Taner Özgürtaş ◽

...

Keyword(s):

Oxidative Stress ◽

Sperm Quality ◽

Dna Integrity ◽

Oxidative Stress Parameters ◽

Bull Sperm ◽

And Oxidative Stress ◽

Stress Parameters

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Protective role of peroxiredoxin-4 in heart failure

Clinical Science ◽

10.1042/cs20191072 ◽

2020 ◽

Vol 134 (1) ◽

pp. 71-72

Author(s):

Naseer Ahmed ◽

Masooma Naseem ◽

Javeria Farooq

Keyword(s):

Heart Failure ◽

Cardiac Fibroblasts ◽

Protective Role ◽

Oxidative Stress Markers ◽

Stress Markers ◽

Total Antioxidant ◽

Galectin 3 ◽

Consequent Increase ◽

And Oxidative Stress

Abstract Recently, we have read with great interest the article published by Ibarrola et al. (Clin. Sci. (Lond.) (2018) 132, 1471–1485), which used proteomics and immunodetection methods to show that Galectin-3 (Gal-3) down-regulated the antioxidant peroxiredoxin-4 (Prx-4) in cardiac fibroblasts. Authors concluded that ‘antioxidant activity of Prx-4 had been identified as a protein down-regulated by Gal-3. Moreover, Gal-3 induced a decrease in total antioxidant capacity which resulted in a consequent increase in peroxide levels and oxidative stress markers in cardiac fibroblasts.’ We would like to point out some results stated in the article that need further investigation and more detailed discussion to clarify certain factors involved in the protective role of Prx-4 in heart failure.

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Protective role of Sterculia tragacantha aqueous extract on pancreatic gene expression and oxidative stress parameters in streptozotocin-induced diabetic rats

Journal of Complementary and Integrative Medicine ◽

10.1515/jcim-2021-0020 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Basiru Olaitan Ajiboye ◽

Babatunji Emmanuel Oyinloye ◽

Jennifer Chidera Awurum ◽

Sunday Amos Onikanni ◽

Adedotun Adefolalu ◽

...

Keyword(s):

Oxidative Stress ◽

Body Weight ◽

Protective Role ◽

Diabetic Rats ◽

Gene Expressions ◽

Ki 67 ◽

Oxidative Stress Parameters ◽

And Oxidative Stress ◽

Stress Parameters

Abstract Objectives The current study evaluates the protective role of aqueous extract of Sterculia tragacantha leaf (AESTL) on pancreatic gene expressions (insulin, PCNA, PDX-1, KI-67 and GLP-1R) and oxidative stress parameters in streptozotocin-induced diabetic rats. Methods Diabetes mellitus was induced into the experimental Wistar animals via intraperitoneal (IP) injection of streptozotocin (35 mg/kg body weight) and 5% glucose water was given to the rats for 24 h after induction. The animals were categorized into five groups of 10 rats each as follows normal control, diabetic control, diabetic rats administered AESTL (150 and 300 mg/kg body weight) and diabetic rats administered metformin (200 mg/kg) orally for two weeks. Thereafter, the animals were euthanized, blood sample collected, pancreas harvested and some pancreatic gene expressions (such as insulin, PCNA, PDX-1, KI-67, and GLP-1R)s as well as oxidative stress parameters were analyzed. Results The results revealed that AESTL significantly (p<0.05) reduced fasting blood glucose level, food and water intake, and lipid peroxidation in diabetic rats. Diabetic rats administered different doses of AESTL showed a substantial upsurge in body weight, antioxidant enzyme activities, and pancreatic gene expressions (insulin, PCNA, PDX-1, KI-67, and GLP-1R). Conclusions It can therefore be concluded that AESTL has the ability to protect the pancreas during diabetes mellitus conditions.

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