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A maternal low-protein diet (MLP) fed during pregnancy leads to hypertension in adult rat offspring. Hypertension is a major risk factor for ischaemic heart disease. This study examined the capacity of hearts from MLP-exposed offspring to recover from myocardial ischaemia-reperfusion (IR) and related this to cardiac expression of  β -adrenergic receptors ( β -AR) and their associated G proteins. Pregnant rats were fed control (CON) or MLP diets ( n  = 12 each group) throughout pregnancy. When aged 6 months, hearts from offspring underwent Langendorff cannulation to assess contractile function during baseline perfusion, 30 min ischemia and 60 min reperfusion. CON male hearts demonstrated impaired recovery in left ventricular pressure (LVP) and  dP / dt   max  ( P  < 0.01) during reperfusion when compared to MLP male hearts. Maternal diet had no effect on female hearts to recover from IR. MLP males exhibited greater membrane expression of   β    2 -AR following reperfusion and urinary excretion of noradrenaline and dopamine was lower in MLP and CON female rats versus CON males. In conclusion, the improved cardiac recovery in MLP male offspring following IR was attributed to greater membrane expression of   β    2 -AR and reduced noradrenaline and dopamine levels. In contrast, females exhibiting both decreased membrane expression of   β    2 -AR and catecholamine levels were protected from IR injury.

journal of nutrition and metabolism

The Effects of Prenatal Protein Restriction on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="bold">β</mml:mi></mml:mrow></mml:math>-Adrenergic Signalling of the Adult Rat Heart during Ischaemia Reperfusion

The Effects of Prenatal Protein Restriction onβ-Adrenergic Signalling of the Adult Rat Heart during Ischaemia Reperfusion