This present study has demonstrated that during normal pregnancy in the rat the number of beta-cells is increased (hyperplasia) and the volume of the individual beta-cells is increased (hypertrophy). During experimental diabetes, however, the endocrine pancreas has an impaired capacity to compensate during pregnancy. In the experimental diabetic pregnant rat the beta-cells cannot replicate due to the unfavourable metabolic environment. This could reflect the complications caused by diabetes during human pregnancy.
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Assche et al. (1979) studied this question.