JOURNAL ARTICLE

Relationship between urinary albumin and serum soluble fms-like tyrosine kinase 1 (sFlt-1) in normal pregnancy

Jun Yoshimatsu, Harunobu Matsumoto, Kiyomi Goto, Masako Shimano, Hisashi Narahara, Isao Miyakawa
European Journal of Obstetrics, Gynecology, and Reproductive Biology 2006, 128 (1): 204-8
16426725

OBJECTIVE: To investigate if the circulating level of soluble fms-like tyrosine kinase 1 (sFlt-1) and vascular endothelial growth factor (VEGF) correlates with urinary albumin excretion in normal pregnancy.

STUDY DESIGN: Serum specimens and 24h urine collections were requested from normal pregnant women at 28-30 weeks of gestation and the following laboratory tests were performed: serum creatinine, urinary protein, urinary albumin and creatinine clearance. For the present study, 117 normal pregnant women were selected as subjects. Subjects' serum was tested to determine sFlt-1 and VEGF concentrations by ELISA. The correlation between sFlt-1 or VEGF concentrations in the serum and renal laboratory variables were analyzed. Simple regression was used to evaluate the correlations.

RESULTS: A significant association was noted between serum sFlt-1 concentration and urinary albumin excretion (r=0.68; P<.0001). Similarly, a significant association was noted between serum VEGF concentration and urinary albumin excretion (r=-0.39; P<.0001). Other urinary variables showed no correlations with either sFlt-1 or VEGF.

CONCLUSION: Even in normal pregnancy, albumin excretion is affected by an increase in placentally derived sFlt-1. If the sFlt-1 level is kept within normal range, only glomerular endothelial cells are affected and this phenomenon does not spread to the endothelial cells of a whole body.

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