Effects of insulin and myo-inositol on embryo growth and development during early organogenesis in streptozocin-induced diabetic rats.

Abstract

We have previously shown that myo-inositol depletion in the embryonic tissue at a critical stage of organogenesis has a crucial role in hyperglycemia-induced embryopathy. This study tested whether myo-inositol depletion in early organogenesis contributes to the pathogenesis of streptozocin-induced diabetic embryopathy. Rats were made diabetic by streptozocin administration before conception, and the diabetic rats were treated with diet supplemented by 2% myo-inositol or insulin from 6 to 11 gestational days during the period of maximum teratological susceptibility. In each group on the 11th gestational day, growth retardation and incidence of malformations were recorded, and myo-inositol and sorbitol content in the embryonic and extraembryonic tissues were examined. In diabetic rats, the myo-inositol content of the embryos was decreased by 36% (P less than 0.01) compared with control rats, and there was growth retardation (crown-rump length 3.37 +/- 0.04 vs. 3.87 +/- 0.03 mm, P less than 0.01; somite no. 27.5 +/- 0.2 vs. 29.1 +/- 0.2, P less than 0.01) and a significantly increased incidence of the neural lesions (17.6 vs. 1.9%, P less than 0.01). Insulin treatment resulted in near normalization of maternal serum glucose and complete restoration of myo-inositol content in the embryos with significant improvement of the growth retardation (crown-rump length 3.55 +/- 0.06 vs. 3.37 +/- 0.04 mm, P less than 0.05; somite no. 28.2 +/- 0.13 vs. 27.5 +/- 0.2, P less than 0.05) and a significantly lowered incidence of neural lesions (2.5 vs. 17.6%, P less than 0.01) compared with those of the untreated diabetic rats.(ABSTRACT TRUNCATED AT 250 WORDS)

• Authors: M Akashi, S Akazawa, M Akazawa, R Trocino, M Hashimoto, Y Maeda, H Yamamoto, E Kawasaki, H Takino, A Yokota
• Journal: Diabetes (Diabetes) Vol. 40 Issue 12 Pg. 1574-9 (Dec 1991) ISSN: 0012-1797 [Print] United States
• PMID: 1756898 (Publication Type: Journal Article)

Chemical References

• Insulin
• Inositol

Topics

• Animals
• Body Weight (drug effects)
• Diabetes Mellitus, Experimental (drug therapy, physiopathology)
• Diet
• Embryonic and Fetal Development (drug effects)
• Female
• Inositol (pharmacology)
• Insulin (therapeutic use)
• Maternal-Fetal Exchange
• Pregnancy
• Pregnancy in Diabetics (drug therapy, physiopathology)
• Rats
• Rats, Inbred Strains
• Reference Values