|Year : 2013 | Volume
| Issue : 2 | Page : 42-45
Evaluation of lipid peroxidation in cases of idiopathic male infertility: correlation with the hypo-osmotic swelling test
Hassan A Khodair1, Zakaria Mahran1, Osama Hashim1, Tarek Omran2
1 Department of Dermatology & Andrology, Al-Azhar University, Damietta, Egypt
2 Department of Clinical Pathology, Faculty of Medicine, Al-Azhar University, Damietta, Egypt
|Date of Submission||17-Jul-2013|
|Date of Acceptance||11-Nov-2013|
|Date of Web Publication||31-Dec-2013|
Source of Support: None, Conflict of Interest: None
Lipid peroxidation of sperm plasma membranes has a deleterious effect on the semen quality, and measurement of malondialdehyde acid (MDA) is the most widely used method for assessing lipid peroxidation. High levels of seminal MDA represent increased lipid peroxidation rates and oxidative damage to the sperm plasma membranes, which may result in the impairment of the integrity and functioning of sperm plasma membranes and damage of both nuclear and mitochondrial DNA.
Aim of the study
The aim of the present study was to investigate the seminal plasma MDA concentration as a marker of lipid peroxidation and its correlation with the hypo-osmotic swelling test (HOST) scores as a predictor for the functional integrity of the sperm membrane in cases of idiopathic male infertility.
Participants and methods
A total of 93 men were included in this study: 68 men who had been attending to our andrology outpatient clinics with idiopathic infertility were selected as cases and 25 healthy fertile men were assigned as control group. Both groups were subjected to the following laboratory investigations: semen analysis, peroxidase test, HOST, and measurement of MDA in the seminal plasma.
Our results showed that seminal plasma concentration of MDA was significantly higher in men with idiopathic infertility compared with the fertile control group ( P ≤ 0.001), and HOST was significantly lower in men with idiopathic infertility compared with the fertile control group ( P ≤ 0.001). In addition, the results showed a strong negative correlation between MDA concentration and HOST ( P ≤ 0.001).
Our results suggest that the evaluation of lipid peroxidation must be used in combination with the HOST as a diagnostic tool in men with idiopathic infertility in addition to standard semen analysis.
Keywords: HOST, lipid peroxidation, male infertility, MDA
|How to cite this article:|
Khodair HA, Mahran Z, Hashim O, Omran T. Evaluation of lipid peroxidation in cases of idiopathic male infertility: correlation with the hypo-osmotic swelling test. Egypt J Dermatol Venerol 2013;33:42-5
|How to cite this URL:|
Khodair HA, Mahran Z, Hashim O, Omran T. Evaluation of lipid peroxidation in cases of idiopathic male infertility: correlation with the hypo-osmotic swelling test. Egypt J Dermatol Venerol [serial online] 2013 [cited 2020 May 31];33:42-5. Available from: http://www.ejdv.eg.net/text.asp?2013/33/2/42/123925
| Introduction|| |
Metabolism in human sperm produces various reactive oxygen species (ROS), which when present in excess possess potentially toxic effects on both sperm quality and function >sup>,,,. However, small physiological levels of ROS are essential for the regulation of normal sperm functions such as sperm capacitation, acrosome reaction, and sperm-oocyte fusion  . Human ejaculate consists of different types of cells such as mature and immature spermatozoa, round cells, leukocytes, and epithelial cells. Of these, peroxidase-positive leukocytes and abnormal spermatozoa produce free radicals continuously , . Seminal plasma contains enzymatic ROS scavengers such as superoxide dismutase, glutathione peroxidase, and catalase. These enzymes act as an antioxidant and inhibitor of lipid peroxidation [8-10]. The process of lipid peroxidation is the oxidative conversion of polyunsaturated fatty acids to products such as malondialdehyde acid (MDA). High levels of seminal MDA represent increased lipid peroxidation rates and oxidative damage to the sperm membranes  . MDA, an end product of lipid peroxidation, reacts with thiobarbituric acid (TBA) to form a colored substance. Measurement of MDA by TBA reactivity is the most widely used method for assessing lipid peroxidation  . The hypo-osmotic swelling test (HOST) was originally used as a sperm function test to evaluate the integrity of the sperm membrane ,, and as a vitality test alternative to dye exclusion when staining of spermatozoa is avoided  . A large population of apparently normal men have problem impregnating their partners even when their fertility status indicated by routine semen analysis is considered normal. These cases were classified as idiopathic infertility and represented about 60-75% of male infertility  .
| Participants and methods|| |
This study was conducted during the period of June 2011 to June 2012 and included 93 men who had been attending to our andrology outpatient clinics at Damietta university hospital, Al-Azhar University. Sixty-eight men with idiopathic infertility, who had normal semen parameters with a duration of infertility of 2-7 years, were selected as cases and 25 healthy fertile men as control group. Both groups were comparable in terms of age with normal health. Patients taking medications or antioxidants and smokers were excluded. Patients suffering from varicocele and acute infections or leukocytospermia were excluded from the study because of their well-known high seminal ROS levels. The fertilizing capacity of the female partners of those infertile men including hormonal assay and folliculometry were assessed and were found functionally normal. Both groups were subjected to the following laboratory investigations: semen analysis including, peroxidase test and the HOST in addition to measurement of malondialdehyde content (MDA) in the seminal plasma.
| Laboratory evaluation|| |
Semen collection and evaluation
All semen samples were produced by masturbation after 3-5 days of abstinence, collected in a sterile plastic container, and incubated at 37°C following collection. The following routine parameters were assessed according to the WHO laboratory manual. The specimens were analyzed for volume, pH, color, liquefaction, agglutination, sperm concentration, percentage and grade of motility, sperm morphology, sperm vitality, total sperm count, and total motile sperms. Results were considered normal when the semen volume was greater than 2 ml, sperm density was greater than 15 × 10 6 /ml, there was more than 32% forward progressive motility, and there were less than 85% abnormal forms including dead sperm , .
Leukocytes were counted by the LeucoScreen method. Briefly, mix one drop of semen with one drop of working solution (leucoscreen stain and hydrogen peroxide), cover with a cover slip for 2 min, and then read the result at a magnification of ×400. Peroxidase-positive cells are stained yellow to brown, whereas other cells are stained pink  .
Hypo-osmotic swelling test evaluation
Live spermatozoa with normal membrane function show swelling of the cytoplasm and curling of the tail due to water influx when exposed to hypo-osmotic conditions. The incidence of greater than 60% swollen spermatozoa showing different degrees of swelling ranging from swelling only at the tip of the tail to the swollen area enveloping the curved tail of the sperm was considered as an index for a normal fertile sample  .
Measurement of malondialdehyde acid concentration
Lipid peroxidation was measured by determining the MDA production using the TBA method. After liquefaction, semen samples were centrifuged at 3500 rpm for 15 min to obtain seminal plasma. Then, 0.1 ml of seminal plasma was added to 0.75 ml of TBA reagent (0.8 g of 2-TBA dissolved in 80 ml of distilled water with 0.5 ml of NaOH). Perchloric acid (7%) was added to this mixture to adjust the pH to 7.4. This mixture was heated for 1 h at 95°C in a warm water bath. After cooling, the tube was centrifuged for 10 min at 4000 rpm and the absorbance of the supernatant was read at 535 nm using a spectrophotometer  . The results were expressed as nmol MDA/ml seminal plasma.
| Results|| |
General characteristics of both fertile and idiopathic infertile groups
Mean age in idiopathic infertile and fertile control groups was 34.5 ± 3.5 (range 26-46 years) and 33.5 ± 2.5 (range 25-45 years), respectively, as shown in [Table 1].
|Table 1: Mean age in both fertile and idiopathic infertile groups (mean ± SD) |
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Semen parameters studies
The study parameters were the color of the semen, coagulation, pH, semen volume, liquefaction, viscosity, sperm concentration, motility, grade of motility, sperm morphology, sperm vitality, total sperm count, and total motile sperm in both groups. The results (mean ± SD, P > 0.05) are given in [Table 2].
|Table 2: Semen parameters data in both fertile and idiopathic infertile groups (mean ± SD) |
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Mean white blood cells (10 6 /ml) in idiopathic infertile and fertile control groups were 0.05 ± 0.03 × 10 6 /ml and 0.06 ± 0.02 × 10 6 /ml (P > 0.05), respectively, as shown in [Table 3].
|Table 3: White blood cells concentration in both fertile and idiopathic infertile groups (mean ± SD) |
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The results obtained in the present study showed that the seminal plasma concentration of MDA was significantly higher in men with idiopathic infertility compared with the fertile control group (29.67 ± 5.77 vs. 14.99 ± 5.60 nmol/ml, P ≤ 0.001), as shown in [Table 4].
|Table 4: Malondialdehyde acid concentration in both fertile and idiopathic infertile groups (mean ± SD) |
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The result was significantly lower in men with idiopathic infertility compared with the fertile control group (39.5 ± 3.7 vs. 71.0 ± 5.4%, P ≤ 0.001), as shown in [Table 5].
|Table 5: Hypo-osmotic swelling test in both fertile and idiopathic infertile groups (mean ± SD) |
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Correlation between MDA concentration and HOST
The results obtained in the present study showed a strong negative correlation between HOST and MDA concentration ( P ≤ 0.001), as shown in [Figure 1].
| Discussion|| |
Our study found no statistically significant differences in the data of semen parameters and white blood cells concentration (no leukocytospermia) between the idiopathic infertile men and fertile controls (P > 0.05). However, our results showed that the seminal MDA concentration was significantly higher in men with idiopathic infertility compared with the fertile control group ( P ≤ 0.001). Despite numerous studies explored a strong negative correlation between lipid peroxidation and semen parameters data, our study is the first to evaluate the MDA level in idiopathic infertile men. In previous studies, seminal MDA level significantly increased in patients with oligoasthenoteratozoospermia [18-21]. Another studies found that the seminal MDA level significantly increased in patients with asthenozoospermia and oligoasthenoteratozoospermia [22-24].
Our study found that HOST was significantly lower in men with idiopathic infertility compared with the fertile control group ( P ≤ 0.001). Our study is the first to evaluate the correlation between lipid peroxidation, MDA level, and HOST. Our study found that elevated concentrations of seminal MDA were strongly and negatively associated with HOST (P ≤ 0.001). According to these results, high levels of seminal MDA represent increased lipid peroxidation rates and oxidative damage to the sperm plasma membranes, which may help to clarify the cause of impaired HOST in our idiopathic infertile men. Consequently, these findings suggest an explanation why patients with normal semen parameters experience idiopathic infertility. Our results support another studies in which an increased incidence of miscarriage was observed in couples with abnormal HOST results undergoing IVF procedures  . Our study explored that normal semen analysis does not guarantee the fertilization potential of the sperm, and studies have shown a significant overlap in the semen parameter values between fertile and infertile men.
| Conclusion|| |
Lipid peroxidation of sperm plasma membrane has a deleterious effect on the sperm function and quality. Measurement of the MDA level in seminal plasma must be used as an important oxidative stress parameter in combination with HOST as a diagnostic tool in men with idiopathic infertility in addition to standard semen analysis.
| Acknowledgements|| |
Conflicts of interest
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[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]