a-Tocopherol modifies the expression of genes related to oxidative stress and apoptosis during invitro maturation and enhances the developmental competence of rabbit oocytes

Arias-Álvarez M, García-García RM, López-Tello J, Rebollar PG, Gutiérrez-Adán A, Lorenzo PL

Reprod Fertil Dev. 2018 Jul 3. doi: 10.1071/RD17525. [Epub ahead of print]

Abstract

The developmental competence of invitro maturation (IVM) oocytes can be enhanced by antioxidant agents. The present study investigated, for the first time in the rabbit model, the effect of adding α-tocopherol (0, 100, 200 and 400µM) during IVM on putative transcripts involved in antioxidant defence (superoxide dismutase 2, mitochondrial (SOD2), glutathione peroxidase 1 (GPX1), catalase (CAT)), cell cycle regulation and apoptosis cascade (apoptosis tumour protein 53 (TP53), caspase 3, apoptosis-related cysteine protease (CASP3)), cell cycle progression (cellular cycle V-Akt murine thymoma viral oncogene homologue 1 (AKT1)), cumulus expansion (gap junction protein, alpha 1, 43 kDa (GJA1) and prostaglandin-endoperoxide synthase 2 (prostaglandin G/H synthase and cyclo-oxygenase) (PTGS2)) and metabolism (glucose-6-phosphate dehydrogenase (G6PD)). Meiotic progression, mitochondrial reallocation, cumulus cell apoptosis and the developmental competence of oocytes after IVF were also assessed. Expression of SOD2, CAT, TP53, CASP3 and GJA1 was downregulated in cumulus-oocyte complexes (COCs) after IVM with 100μM α-tocopherol compared with the group without the antioxidant. The apoptotic rate and the percentage of a non-migrated mitochondrial pattern were lower in COCs cultured with 100μM α-tocopherol, consistent with better-quality oocytes. In fact, early embryo development was improved when 100μM α-tocopherol was included in the IVM medium, but remained low compared with invivo-matured oocytes. In conclusion, the addition of 100μM α-tocopherol to the maturation medium is a suitable approach to manage oxidative stress and apoptosis, as well as for increasing the in vitro developmental competence of rabbit oocytes.

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Vitamin E as alternative local treatment in genitourinary syndrome of menopause: a randomized controlled trial

Golmakani N, Parnan Emamverdikhan A, Zarifian A, Sajadi Tabassi SA, Hassanzadeh M

Int Urogynecol J. 2018 Jul 3. doi: 10.1007/s00192-018-3698-z. [Epub ahead of print]

Abstract

INTRODUCTION AND HYPOTHESIS:

Genitourinary syndrome of menopause is a major health concern in postmenopausal women. This study was aimed at comparing the effect of a vitamin E vaginal suppository with that of conjugated estrogen vaginal cream on sexual function in postmenopausal women with genitourinary syndrome of menopause.

METHODS:

This survey was carried out on 52 postmenopausal women aged 40-65 years who had been referred to gynecology clinics in Mashhad city, during 2013-2014. Keeping β = 0.1, the power was calculated to be 90%. The patients were randomly divided into two groups: vitamin E vaginal suppository and conjugated estrogen vaginal cream. Participants used the medications for 12 weeks. They were visited at the 4th, 8th, and 12th weeks. Validated Abbreviated Sexual Function Questionnaire (ASFQ), as the primary outcome measure, and a demographic information questionnaire, were used to collect data at each visit. Data were analyzed using SPSS and p < 0.05 was considered statistically significant.

RESULTS:

Mean overall scores of the ASFQ were increased significantly in both groups during the course of the study, compared with baseline (p < 0.001). However, the mean ASFQ scores of the two treatments did not differ significantly.

CONCLUSION:

Improved scores of ASFQ after the 12th week showed that the treatment was successful in both groups. Therefore, a vitamin E vaginal suppository may be an alternative to vaginal estrogen in relieving the symptoms of vaginal atrophy in postmenopausal women, especially those not able to use hormone therapy or have low compliance.

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