Markers of oxidative stress in postmenopausal women with metabolic syndrome.

During the postmenopausal period, there are metabolic alterations that predispose individuals to metabolic syndrome (MS), oxidative stress (OS), and the risk of developing cardiovascular diseases. We aimed to compare the concentrations of OS markers in postmenopausal women with and without MS. Malondialdehyde, carbonyl groups, and total antioxidant capacity (TAC) were quantified. We conducted a cross-sectional study: Group 1 (n = 42) included women without MS, and Group 2 (n = 58) comprised women with MS. Participants' age was similar between groups. Glucose, insulin, the homeostasis model assessment of insulin resistance, triglycerides, uric acid, and body mass index were significantly lower in postmenopausal women without MS. OS markers were significantly lower in Group 1 vs. Group 2: malondialdehyde, 31.32 ± 14.93 vs. 40.27 ± 17.62 pmol MDA/mg dry weight (p = .01); protein carbonylation, 6325 ± 1551 vs. 7163 ± 1029 pmol PC/mg protein (p = .0003); and TAC, 1497 ± 297.3 vs. 1619 ± 278.8 pmol Trolox equivalent/mg protein (p = .041). OS markers were significantly higher in postmenopausal women with MS. Impact statementWhat is already known on this subject? Oxidative stress has been implicated in numerous disease processes; however, information on the relationship between oxidative stress and metabolic syndrome among postmenopausal women remains limited.What do the results of this study add? Our results indicate that in postmenopausal Mexican women, oxidative stress markers were significantly lower in those without metabolic syndrome, whereas total antioxidant capacity was higher in those with metabolic syndrome, which could be explained as an antioxidant defense mechanism capable of neutralising excess oxidative damage markers.What are the implications of these findings for clinical practice and/or further research? This study is of interest to a broad audience because it compares the concentrations of oxidative stress markers in postmenopausal women with and without metabolic syndrome. Our study could support intervention with supplements or foods rich in antioxidants as lifestyle modifications in postmenopausal women with metabolic syndrome.

Parameters of Oxidative Stress in Reproductive and Postmenopausal Mexican Women.

In the reproductive phase, women experience cyclic changes in the ovaries and uterus, and hormones regulate these changes. Menopause is the permanent loss of menstruation after 12 months of amenorrhea. Menopause is also linked to a decrease in estrogen production, causing an imbalance in oxidative stress. We aimed to compare the three stages of lipid peroxidation, protein oxidative damage, and total antioxidant capacity (TAC) between reproductive-aged women (RAW) and postmenopausal women (PMW) in Mexico. We carried out a cross-sectional study with 84 women from Mexico City, including 40 RAW and 44 PMW. To determine the oxidative stress of the participants, several markers of lipid damage were measured: dienes conjugates (DC), lipohydroperoxides (LHP), and malondialdehyde (MDA); exposure to protein carbonyl is indicative of oxidative modified proteins, and TAC is indicative of the antioxidant defense system. Biomarkers of oxidative stress were significantly lower in RAW vs. PMW. DC were 1.31 ± 0.65 vs. 1.7 ± 0.51 pmol DC/mg dry weight (p = 0.0032); LHP were 4.95 ± 2.20 vs. 11.30 ± 4.24 pmol LHP/mg dry weight (p < 0.0001); malondialdehyde was 20.37 ± 8.20 vs. 26.10 ± 8.71 pmol MDA/mg dry weight (p = 0.0030); exposure of protein carbonyl was 3954 ± 884 vs. 4552 ± 1445 pmol PC/mg protein (p = 0.042); and TAC was 7244 ± 1512 vs. 8099 ± 1931 pmol Trolox equivalent/mg protein (p = 0.027). PMW display significantly higher oxidative stress markers compared to RAW; likewise, PMW show a higher TAC.

Descripción demográfica, bioquímica y sintomática según los estadios reproductivos STRAW+10 en mujeres mexicanas en la peri y posmenopausia / Demographic, biochemical and symptomatic description according to STRAW + 10 reproductive stages in Mexican women in peri and postmenopause

Resumen OBJETIVO: Categorizar el perfil demográfico, bioquímico y sintomático de la población mexicana atendida en el Instituto Nacional de Perinatología para describir su comportamiento en los estadios del envejecimiento reproductivo. MATERIALES Y MÉTODOS: Estudio transversal y descriptivo efectuado entre junio y diciembre de 2018 en pacientes de la Clínica de peri y posmenopausia del Instituto Nacional de Perinatología. Criterios de inclusión: mujeres mayores de 41 años con diagnóstico de peri y posmenopausia, clasificadas según STRAW+10 en tres categorías: Categoría 1 (-2 a -1), Categoría 2 (+1A a +1C) y Categoría 3 (+2). Para el análisis estadístico se obtuvieron medidas de tendencia central, χ2 y ANOVA para el análisis inferencial. RESULTADOS: Se estudiaron 741 pacientes peri y posmenopáusicas, con edad promedio a la menopausia de 50.08 años. El promedio de edad poblacional fue de 57.11 años, con un índice de masa corporal promedio de 27.92, con 56.2% de la población en límites de obesidad. La comorbilidad más frecuente fue la hipertensión arterial y el síntoma más reportado, los bochornos, más prevalentes durante la transición a la menopausia. CONCLUSIONES: El sistema STRAW+10 es una manera clínica y objetiva de estadificar a las pacientes en transición a la menopausia. Es importante emprender más estudios poblacionales en mujeres para describir el comportamiento del envejecimiento reproductivo en México.

Abstract OBJECTIVE: Categorize the demographic, biochemical and symptomatic profile of the Mexican population served at the Instituto Nacional de Perinatología to describe their behavior in the stages of reproductive aging. MATERIALS AND METHODS: The following is an observational, descriptive, cross sectional study women from the Peri- and Postmenopause clinic at the National Institute of Perinatology in Mexico that enrolled 741 women over 41 years of age with a diagnosis of menopause according to the STRAW+10 criteria and classified in three categories: Category 1 (-2 to -1), Category 2 (+1A to +1C), and Category 3 (+2). The statistical analysis was performed by measure of central tendency, χ2 and ANOVA for the inferential analysis. RESULTS: In our population of 741 women, the average age at menopause was 50.08 years, while the population's age average was 57.11 years. Average body mass index was 27.92 kg/m2, with 56.2% of the population within obesity range. The most prevalent comorbidity was arterial hypertension and the most frequent symptom was hot flushes. Hot flushes were most prevalent during the transition to menopause. CONCLUSIONS: The STRAW+10 is an objective way to clinically classify patients in transition to menopause. There is an important need for more population-based studies in women to describe the reproductive ageing behavior in Mexico.