Dynamics of nitric oxide altered follicular microenvironment and oocyte quality in women with endometriosis

Women with endometriosis undergoing assisted reproductive technology have increased nitrate and peroxynitrite in the oocyte microenvironment concurrent with adverse impact on maturation and aging of immature oocytes.

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Authors

Pravin T. Goud, M.D., Ph.D., Anuradha P. Goud, M.S., Ph.D., Narendra Joshi, Ph.D., Michael P. Diamond, M.D., Elizabeth Puscheck, M.D., M.S., Husam M. Abu-Soud, Ph.D.

Volume 102, Issue 1, Pages 151–159.e5

Abstract

Objective:

To study follicular microenvironment in terms of free radical dynamics, oocyte quality, and assisted reproductive technology (ART) outcomes among women with (group A) and without (group B) endometriosis.

Design:

Prospective cohort study.

Setting:

University ART center.

Patient(s):

Women with and without endometriosis undergoing ART (n = 28).

Intervention(s):

Follicular fluid (FF), granulosa cells (GCs), immature oocytes (IOs), and ART data on sibling cohort oocytes in groups A and B were compared.

Main Outcome Measure(s):

ART live birth outcomes, maturation, and aging among in vitro matured (IVM) oocytes, nitrate levels in FF, and nitrotyrosine (NT) footprints and apoptosis in the GCs.

Result(s):

Clinical characteristics and ART live birth outcomes were no different between groups A and B. Women from group A had significantly lower peak serum E2 (2,068.8 ± 244.6 pg/mL vs. 2,756.2 ± 205.0 pg/mL) and higher apoptosis (80.0% vs. 22.2%) and NT staining (70.0% vs. 22.2%) in GCs compared with group B. Fewer IOs underwent IVM to MII (0.6 ± 0.3) in group A compared with group B (1.4 ± 0.2). IVM oocytes had significantly higher incidence of cortical granule loss (83.3% vs. 24.0%) and spindle disruption (66.7% vs. 16.0%) and higher zona pellucida dissolution timing (133.8 ± 9.4 s vs. 90.5 ± 5.8 s) in group A compared with group B. FF nitrate levels were significantly higher in women who failed to conceive in group A (478.2 ± 43.1 nmol/L) compared with those that did conceive (173.3 ± 19.0 nmol/L).

Conclusion(s):

Increased protein nitration, GC apoptosis, resistance to IVM, and oocyte aging indicate the involvement of oxidative dysregulation of NO in the pathophysiology of altered follicular milieu and poor oocyte quality in women with endometriosis.

Read the full text at: http://www.fertstert.org/article/S0015-0282(14)00308-2/fulltext


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Fertility and Sterility® is an international journal for obstetricians, gynecologists, reproductive endocrinologists, urologists, basic scientists and others who treat and investigate problems of infertility and human reproductive disorders. The journal publishes juried original scientific articles in clinical and laboratory research relevant to reproductive endocrinology, urology, andrology, physiology, immunology, genetics, contraception, and menopause. Fertility and Sterility® encourages and supports meaningful basic and clinical research, and facilitates and promotes excellence in professional education, in the field of reproductive medicine.

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