Abstract
The effects of gestational diabetes mellitus (GDM) were determined on urinary excretion of putative components of insulin signaling. Random urine samples were collected from 375 gravidas at 6 to 14 weeks' gestation, 22 to 32 weeks' gestation, and ∼6 weeks' postpartum. Gestational diabetes mellitus developed in 35 women who were matched with 59 normal gravidas. Urinary concentrations of myo-inositol (MI) and D-chiro-inositol (DCI) were measured by gas chromatography/mass spectrometry and normalized to creatinine levels. Compared to postpartum values, urinary excretion of MI and DCI was increased 2.9-fold and 2-fold, respectively, in early pregnancy, and 5.5-fold and 4.5-fold, respectively, in later gestation. Gravidas with GDM had significantly greater MI and DCI excretion than controls in the first trimester but not subsequently. The results suggest that gravidas destined to develop GDM have altered synthesis, metabolism, and/or renal excretion of MI and DCI in early pregnancy.
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