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  • Title: Serum levels of macrophage colony-stimulating factor in singleton and twin pregnancy.
    Author: Hayashi M, Fukasawa I, Inaba N.
    Journal: Horm Metab Res; 2006 Mar; 38(3):193-6. PubMed ID: 16673212.
    Abstract:
    Macrophage colony-stimulating factor (M-CSF) is present in the placenta and has been implicated in placental growth and development. M-CSF levels in peripheral blood increase significantly with progression of pregnancy in uncomplicated singleton pregnancy. This study investigated whether serum M-CSF levels in singleton pregnancy differed from those in twin pregnancy. A hundred and four pregnant women, of whom fifty-nine were women carrying single fetuses and forty-five were women with twin fetuses, participated in the study. Their average gestational age at entry was 10, 20, 30, and 38 weeks of gestation in singleton pregnancy and 10, 20, 30, and 35 weeks in twin pregnancy. Peripheral blood was collected and serum was separated after centrifugation and stored at - 20 degrees C. M-CSF levels were determined by ELISA. In both groups, the serum levels of M-CSF increased significantly as pregnancy progressed. M-CSF levels were relatively higher in twin pregnancy than in singleton pregnancy at 10, 20, and 30 weeks. At 35 and 38 weeks, the M-CSF levels were significantly higher in twin pregnancy than in singleton pregnancy. Elevation of serum M-CSF supports M-CSF production in the placenta. This elevation in twin pregnancy may be related to increased demand of M-CSF in twin pregnancy.
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