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Hum. Reprod. Advance Access originally published online on February 17, 2006
Human Reproduction 2006 21(6):1453-1460; doi:10.1093/humrep/del005
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© The Author 2006. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Plasma levels of soluble vascular endothelial growth factor receptor-1 may determine the onset of early and late ovarian hyperstimulation syndrome

Elena Pau1,*, Isabel Alonso-Muriel1,*, Raul Gómez1, Edurne Novella1, Amparo Ruiz2, Juan A. García-Velasco2, Carlos Simón2 and Antonio Pellicer2,3

1 Instituto Valenciano de Infertilidad Foundation and 2 Instituto Valenciano de Infertilidad, University of Valencia, Valencia, Spain

3 To whom correspondence should be addressed at: Instituto Valenciano de Infertilidad, Plaza Policía Local, 3, 46015, Valencia, Spain. E-mail: apellicer{at}ivi.es

* Both the authors contributed equally to patients’ recruitment, follow-up and biochemical measurements.

BACKGROUND: Ovarian hyperstimulation syndrome (OHSS) is a life-threatening condition associated with ovarian stimulation. Its pathophysiology is unknown and its treatment continues to be empirical. Early (E)- and late (L)-OHSS occur in women at risk, though not in all cases. Vascular endothelial growth factor (VEGF) is related to increased vascular permeability in OHSS. We analysed the dynamics of the VEGF system in E- and L-OHSS. METHODS: A prospective cohort of women undergoing IVF–ICSI treatment were divided into groups. E-OHSS: Nonpregnant patients classified as women not at risk (group 1) (n = 11) and patients at risk who did not (group 2) (n = 18) and did (group 3) (n = 8) develop severe OHSS. Blood was drawn on the day of ovum retrieval (day 0) and 3, 6, 10 and 14 days later. L-OHSS: Single pregnancies classified as women who did not (group 4) (n = 8) and did develop (group 5) (n = 4) OHSS. Single pregnancies after oocyte donation (OD) (n = 4) were compared with groups 4 and 5 (IVF–ICSI). Blood was obtained weekly (weeks 4–12). Total VEGF (VEFG-A), free (f)-VEGF and soluble VEGF receptor 1 (sVEGFR-1) in plasma and in serum {alpha}2-macroglobulin (M) were also measured. RESULTS: Group 3 showed significantly (P < 0.05) higher VEFG-A and f-VEGF than group 1 on day 6 because of lower sVEGFR-1 secretion. Similarly, group 5 had significantly (P < 0.05) more VEFG-A and f-VEGF and less sVEGFR-1 than group 4. Oocyte donation was associated with decreased sVEGFR-1 secretion, and {alpha}2M was not relevant in OHSS development. CONCLUSION: In E- and L-OHSS, the ability to secrete sVEGFR-1 and bind VEGF seems to be the determinant factor in OHSS. f-VEGF acts locally in the ovary.

Key words: ovarian hyperstimulation syndrome/vascular endothelial growth factor/soluble VEGF receptor 1/free VEGF/{alpha}2-macroglobulin


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