Phosphoinositide metabolism in the developing conceptus: Effects of hyperglycemia and scyllo-inositol in rat embryo culture

P. J. Strieleman, M. A. Connors, B. E. Metzger*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Culture of the postimplantation rat conceptus in hyperglycemic medium causes developmental abnormalities and is associated with a diminished water- soluble myo-inositol content. We investigated the effect myo-inositol depletion has on lipid-soluble phosphoinositides, precursors, and water- soluble inositol phosphates. Rat conceptuses were cultured from gestational day 9.5 (presomite, early head fold) to day 10.5 (7-15 somites) in 6.7-73.3 mM D-glucose. Significant decreases in the phosphoinositides of the embryo were observed with increased culture D-glucose concentrations. PI was reduced 15-34%, PIP 18-46%, and PIP2 26-46%. Yolk sac phosphoinositides also were reduced but to a lesser degree. Culture in hyperglycemic media also mediated significant reductions of conceptus inositol phosphates. To investigate whether effects similar to those induced by D-glucose could be mediated by another agent capable of decreasing myo-inositol content, we used scyllo- inositol, a transported but nonmetabolized isomer of myo-inositol. Conceptuses cultured in medium containing scyllo-inositol (0.06-16.7 mM) had dose-dependent decreases of myo-[3H]inositol in water-soluble and lipid- soluble fractions. Incorporation of myo-[3H]inositol into phosphoinositides and inositol phosphates was decreased concomitantly. Developmental effects of D-glucose and scyllo-inositol were assessed in rat conceptuses cultured from day 9.5 (presomite, early head fold) to day 11.5 (22-28 somites). Culture in 40.0-73.3 mM glucose and 0.06-33.3 mM scyllo-inositol impaired growth while increasing dysmorphogenesis in a dose-dependent manner. The results suggest that decreases in conceptus myo-inositol and associated diminution of phosphoinositides, which are the inositol/lipid cycle precursors, are dysmorphogenic and may contribute to the etiology of diabetic embryopathy.

Original languageEnglish (US)
Pages (from-to)989-997
Number of pages9
Issue number8
StatePublished - 1992

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

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