Development, Vol 127, Issue 19 4195-4202, Copyright © 2000 by Company of Biologists

JOURNAL ARTICLES

Maternal undernutrition during the preimplantation period of rat development causes blastocyst abnormalities and programming of postnatal hypertension

WY Kwong, AE Wild, P Roberts, AC Willis and TP Fleming
Division of Cell Sciences, School of Biological Sciences, University of Southampton, Bassett Crescent East, Southampton SO16 7PX, UK.

Epidemiological studies have indicated that susceptibility of human adults to hypertension and cardiovascular disease may result from intrauterine growth restriction and low birth weight induced by maternal undernutrition. Although the 'foetal origins of adult disease' hypothesis has significant relevance to preventative healthcare, the origin and biological mechanisms of foetal programming are largely unknown. Here, we investigate the origin, embryonic phenotype and potential maternal mechanisms of programming within an established rat model. Maternal low protein diet (LPD) fed during only the preimplantation period of development (0-4.25 days after mating), before return to control diet for the remainder of gestation, induced programming of altered birthweight, postnatal growth rate, hypertension and organ/body-weight ratios in either male or female offspring at up to 12 weeks of age. Preimplantation embryos collected from dams after 0-4.25 days of maternal LPD displayed significantly reduced cell numbers, first within the inner cell mass (ICM; early blastocyst), and later within both ICM and trophectoderm lineages (mid/late blastocyst), apparently induced by a slower rate of cellular proliferation rather than by increased apoptosis. The LPD regimen significantly reduced insulin and essential amino acid levels, and increased glucose levels within maternal serum by day 4 of development. Our data indicate that long-term programming of postnatal growth and physiology can be induced irreversibly during the preimplantation period of development by maternal protein undernutrition. Further, we propose that the mildly hyperglycaemic and amino acid-depleted maternal environment generated by undernutrition may act as an early mechanism of programming and initiate conditions of 'metabolic stress', restricting early embryonic proliferation and the generation of appropriately sized stem-cell lineages.
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				M. Dodic, C. Samuel, K. Moritz, E. M. Wintour, J. Morgan, L. Grigg, and J. Wong Impaired Cardiac Functional Reserve and Left Ventricular Hypertrophy in Adult Sheep After Prenatal Dexamethasone Exposure Circ. Res., September 28, 2001; 89(7): 623 - 629. [Abstract] [Full Text] [PDF]