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      Efecto antioxidante de la melatonina durante la conservación de semen de cerdo

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          Abstract

          Durante los procesos de conservación espermática se incrementa la producción de radicales libres y se ha planteado la adición de antioxidantes para mejorar la calidad seminal durante el almacenamiento. Ello asume importancia en especies como el cerdo, donde se ha relacionado el estrés oxidativo al daño del espermatozoide durante la conservación, lo que afecta su capacidad fecundante. Esta investigación tuvo como objetivo determinar el efecto antioxidante de la melatonina durante la conservación de semen de cerdos a 16°C. Las muestras seminales se tomaron de verracos de 7-18 meses de edad. La recolección del semen se realizó con mano enguantada. Las muestras seminales con parámetros óptimos fueron diluidas y divididas en alícuotas: control (con diluyente), control con vehículo (diluyente y etanol) y semen con melatonina (1,25 mM). Luego de la preparación de las alícuotas (día 0) y al día 1 de conservación a 16ºC, se evaluaron indicadores de lipoperoxidación como dienos conjugados (DC, extracción con isopropanol) y malondialdehído; la actividad enzimática de la superoxido dismutasa (SOD) se determinó mediante un kit comercial. Los resultados fueron analizados mediante ANOVA, con paquete estadístico SPSS 15.0 para Windows con p≤0,05. Los niveles de DC en las muestras con melatonina se incrementaron al día 0 y 1 de conservación, de manera significativa (p≤0,05) con respecto al grupo control y con el vehículo, mientras que las concentraciones de malondialdehído al día 1 de conservación en las muestras con melatonina presentaron valores significativamente menores (p≤0,05) con respecto al grupo control, con mayor actividad de la SOD (p≤0,05). Se concluye que la adición de melatonina al semen de cerdo diluido tiene efecto antioxidante durante la conservación espermática a 16°C

          Translated abstract

          During the processes of sperm preservation the free radical production increases, and it has been suggested that the addition of antioxidants improve semen quality during storage, mainly in species such as pork, where this has been linked to oxidative stress and sperm damage during storage, which affects their fertilizing capacity. The goal of this research is to determine the antioxidant effect of the melatonin during the conservation of semen of boars to 16°C. Semen samples were taken of boars 7-18 months old. Semen collection was made with gloved hand. Semen samples with optimal parameters were diluted and divided into aliquots: control (i.e., diluent), control with vehicle (diluent and ethanol) and semen with melatonin (1.25 mM). After the preparation of aliquots (day 0) and on day 1 of conservation at 16°C, lipoperoxidation indicators such as conjugated dienes (DC, isopropanol extraction) and malondialdehyde, were evaluated, The enzymatic activity of dismutase superoxide (SOD) was determined by commercial kit. The results were analyzed by ANOVA, with package statistical SPSS 15.0 for Windows with p≤0.05. Them levels of conjugate dienes (DC) in them samples with melatonin is increase to the day 0 and 1 of conservation, of way significant (p≤0,05) with regard to the control group and with the vehicle, while the concentrations of malondialdehyde to the day 1 of conservation in them samples with melatonin presented values significantly (p≤0,05) minor with respect to the control group, with greater activity of the SOD (p≤0,05). In conclusion, the addition of melatonin in dilute boar semen has an antioxidant effect during sperm storage to 16°C

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          Most cited references23

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          Storage of boar semen.

          The problems, aspects and methods of liquid storage and freeze-thawing of boar semen are discussed and a review is given on examination of spermatozoa by the recent fluorescent staining methods.
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            Oxidative stress, DNA damage and the Y chromosome.

            Recent advances in understanding of male infertility have implicated two major causative factors, oxidative stress and Y chromosome deletions. A major cause of oxidative stress appears to be the high rate of reactive oxygen species generation associated with the retention of excess residual cytoplasm in the sperm midpiece. Other possible causes include the redox cycling of xenobiotics, and antioxidant depletion or apoptosis. Oxidative stress induces peroxidative damage in the sperm plasma membrane and DNA damage in both the mitochondrial and nuclear genomes. Nuclear DNA damage in the germ line of the father may be associated with pathology in the offspring, including childhood cancer and infertility. Gene deletions on the non-recombining region of the Y chromosome account for the infertility observed in about 15% of patients with azoospermia and 5-10% of subjects with severe oligozoospermia. The Y chromosome is particularly susceptible to gene deletions because of the inability of the haploid genome to deploy recombination repair in retrieving lost genetic information. Aberrant recombination, defective chromatin packaging, abortive apoptosis and oxidative stress may all be involved in the aetiology of DNA damage in the germ line. The factors responsible for Y chromosome deletions in spermatozoa remain unresolved but may be one facet of a central reproductive problem: controlling the amount of oxidative stress experienced by germ cells during their differentiation and maturation in the male reproductive tract.
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              Oxidative stress, osmotic stress and apoptosis: impacts on sperm function and preservation in the horse.

              Oxidative stress is an important component of the cytopathology of equine spermatozoa undergoing storage as liquid or frozen semen. Damage to chromatin, membranes and proteins of sperm are important components of oxidative damage to sperm. Similarly, sperm are exposed to a variety of osmotic stresses during storage that result from exposure to hypertonic media or result as a consequence of osmotic changes induced during freezing. A number of changes induced during processing and storage of equine sperm also appear to induce apoptotic-like changes which may adversely affect sperm survival and function. These processes appear in many cases to be interrelated, and this review will examine current understanding of these processes on the equine sperm function.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                revet
                Revista veterinaria
                Rev. vet.
                Universidad Nacional del Nordeste, Facultad de Ciencias Veterinarias (Corrientes, Corrientes, Argentina )
                1669-6840
                June 2018
                : 29
                : 1
                : 13-17
                Affiliations
                [01] Barquisimeto Lara orgnameUniversidad Centroccidental Venezuela caf06@ 123456hotmail.com
                Article
                S1669-68402018000100003
                10.30972/vet.2912780
                5515e5d8-efeb-4e6e-8293-4309c6e44be4

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 24 April 2017
                : 17 January 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 30, Pages: 5
                Product

                SciELO Argentina


                antioxidant,melatonin,conservation of semen,boar,melatonina,cerdo,antioxidante,conservación del semen

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