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. 2003 Nov;20(11):449–454. doi: 10.1023/B:JARG.0000006706.21588.0d

Embryonic Production of Nitric Oxide and Its Role in Implantation: A Pilot Study

C Battaglia 1, P Ciotti 2, L Notarangelo 2, R Fratto 2, F Facchinetti 3, D de Aloysio 1
PMCID: PMC3455639  PMID: 14714823

Abstract

Purpose: To investigate the ability of human embryos to produce nitric oxide (NO) and correlate its production with embryo quality and pregnancy rate.

Methods: Twenty-three women participated in the study and were submitted to controlled ovarian stimulation and intracytoplasmic sperm injection. Embryos were singularly cultured in medium microdrops of 50 μL and were replaced, by transcervical transfer, at the 2- to 6-cell stage. In the culture media of each embryo the NO production was assessed by monitoring the levels of its stable oxidation products (nitrites/nitrates).

Results: All the 23 patients underwent embryo transfer. After microinjection 64 embryos were obtained. The mean number of transferred embryos was 2.61 ± 0.46 and the pregnancy rate was 26%. The mean nitrite/nitrate concentrations of culture medium of each embryo was significantly higher (5.88 ± 2.34 μmol/L) than in pure P-1 medium (0.81 ± 0.21 μmol/L; p<0.001) demonstrating an embryonic secretion of NO. Comparing pregnant (7.34 ± 2.72 μmol/L) versus nonpregnant patients (5.53 ± 1.49 μmol/L; p=0.022), the mean nitrite/nitrate concentrations were significantly higher. Furthermore, the best quality embryos of pregnant women produced significantly higher nitrite/nitrate concentrations than those of not pregnant patients.

Conclusions: It seems that NO production in nidating embryos is increased and that it may be primarily associated with a better morphology and a better growth potential of developing embryos.

Keywords: Embryo, ICSI, implantation, infertility, nitric oxide

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