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  • Title: Regulation of vascular endothelial growth factor-A and its soluble receptor sFlt-1 by luteinizing hormone in vivo: implication for ovarian follicle angiogenesis.
    Author: Gutman G, Barak V, Maslovitz S, Amit A, Lessing JB, Geva E.
    Journal: Fertil Steril; 2008 Apr; 89(4):922-6. PubMed ID: 18343373.
    Abstract:
    OBJECTIVE: To determine in vivo whether LH supplementation during the late follicular phase induces ovarian follicle angiogenesis in humans, as reflected by vascular endothelial growth factor (VEGF)-A, its soluble receptor sFlt-1, and placental growth factor (PlGF) expression. DESIGN: Randomized, double-blind, placebo-controlled study. SETTING: Academic tertiary care medical center. PATIENT(S): Twenty infertile, healthy women (aged 18-39 years) undergoing IVF. INTERVENTION(S): Administration of recombinant FSH after down-regulation and equal randomization of subjects to receive recombinant LH 75 IU/day or placebo when two or more follicles reached a mean diameter of 14 mm. MAIN OUTCOME MEASURE(S): Serum and follicular fluid (FF) VEGF-A, sFlt-1, and PlGF protein levels were measured. RESULT(S): Recombinant LH increased both the FF VEGF-A/sFlt-1 ratio statistically significantly and PlGF/sFlt-1 insignificantly. Recombinant LH did not affect the serum VEGF/sFlt-1 ratio. Plasma levels of PlGF were undetectable. CONCLUSIONS: This in vivo study demonstrates for the first time in humans that LH induces ovarian follicular angiogenesis via modulation of VEGF-A and its soluble receptor sFlt-1 expression. A constant VEGF-A/sFlt-serum ratio may prevent adverse effects of VEGF-A. Because angiogenesis is essential during the periovulatory period, recombinant LH supplementation during the late follicular phase may improve ovulation induction outcome.
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