The Association between Clusterin Sialylation Degree and Levels of Oxidative–Antioxidant Balance Markers in Seminal Plasmas and Blood Sera of Male Partners with Abnormal Sperm Parameters

Abstract

Nearly 30% of infertility cases are caused by male factor. This study aimed at checking the associations between the sialylation degree of glycoprotein clusterin (CLU) and levels of oxidative–antioxidant balance markers in infertile men. Using lectin-ELISA with biotinylated lectins specific to α2,6-linked (Sambucus nigra agglutinin, SNA) and α2,3-linked (Maackia amurensis agglutinin, MAA) sialic acid (SA), the CLU sialylation in 132 seminal plasmas (SP) and 91 blood sera (BS) were analyzed. Oxidative–antioxidant status was measured by determining Sirtuin-3 (SIRT3), Sirtuin-5 (SIRT5), total antioxidant status (TAS), and ferric reducing antioxidant power (FRAP) levels. We indicate that multiple sperm disorders are associated with decreased expression of MAA-reactive SA in SP. Decreased SP SIRT3 concentrations may be associated with teratozoospermia and oligoasthenoteratozoospermia. ROC curve and cluster analysis revealed that SP relative reactivity of CLU glycans with MAA, the value of MAA/SNA ratio, and SIRT3 and SIRT5 concentrations may constitute an additional set of markers differentiating infertile oligoasthenoteratozoospermic patients (OAT) from normozoospermic (N), asthenoteratozoospermic (AT) and teratozoospermic (T). The multinomial logistic regression analysis confirmed the potential utility of SIRT3 determinations for differentiation between N and OAT groups as well as between N and T groups for SIRT3 and SIRT5. For BS, based on ROC curve and cluster analysis, relative reactivities of CLU glycans with SNA, MAA, SIRT3 and FRAP concentrations may be useful in the differentiation of normozoospermic patients from those with sperm disorders. The multinomial logistic regression analysis showed that the SNA relative reactivity with CLU glycans significantly differentiated the N group from AT, OAT and T groups, and FRAP concentrations significantly differed between N and AT groups, which additionally confirms the potential utility of these biomarkers in the differentiation of infertile patients with abnormal sperm parameters. The knowledge about associations between examined parameters may also influence future research aimed at seeking new male infertility therapies.

Assessment of oxidative proteins modification level in infertile males ejaculate secondary to toxocara invasion

“…Besides, spermatozoa DNA fragmentation was observed just in the groups with the most pronounced oxidative stress, that was combined with more severe forms of pathozoospermia revealed earlier in the fourth and fifth groups [17,18]. Notes: * -statistically significant difference compared to control group (р < 0,05), ** -statistically significant difference compared to 2 group (p < 0,05) CONCLUSION 1.…”

Особливості Окисної Модифікації Білків Еякуляту Інфертильних Чоловіків За Умови Наявності/Відсутності Антитіл До Токсокар

“…Опубліковані останнім часом результати клінічних та експериментальних досліджень дозволили виділити недостатньо вивчені аспекти даної проблеми, а саме визначення ОМБ практично завжди проводили в крові пацієнтів, тоді як аналогічні дослідження в еякуляті були відсутні, хоча саме ці дослідження були б більш логічним [11,12].…”

Sialylation: fate decision of mammalian sperm development, fertilization, and male fertility

“…Due to the negative charge properties and terminal position characteristics of sialylation [135,136], sialylation can affect the tertiary conformation and biological activity of molecules through charge effects and steric hindrance [34,[137][138][139]. Furthermore, it also affects glycoproteins' physical, chemical, and biological properties [49], thereby influencing molecular networks and cell interactions.…”

“…In patients with asthenospermia, there is a significant reduction in the relative activity of seminal plasma glycoproteins and sambucus nigra lectin (SNA). In addition, the concentration of CLU in seminal plasma increases with a decrease in α2,3-linked sialylation in the polysaccharide [49]. Furthermore, some sialylation indicators, such as sialyl-Lewisx antigen in α1-acid glycoprotein (ORM1), can serve as reproductive inflammatory markers for leukocytospermia [115].…”

“…In infertile male sperm, there is also a certain degree of reduced sialyltransferase activity [251]. At the same time, it has been found that infertile subjects lack sialylation in seminal samples [252], and sialylation as a biochemical indicator has moderate clinical value in infertile male patients [49]. Sialylation can be used as one of the biological markers of oligozoospermia [253][254][255].…”