The aim of the study was to find the quantitative relationship of postnatal changes in the glomeruli anatomic structure with the blood flow in kidneys. Kidney development was studied in 4-, 12-, 30-, and 65-day-old Wistar rats. Diameters of glomerulus (Dgl, μm), afferent and efferent arterioles (Daf and Def), and the glomeruli density (Ngl/mm−3) were measured posthumously. Volumes of one (Ugl, μm3) and all glomeruli (ΣUgl, mm3/cm3) and the glomeruli arterioles lumen (Saf, Sef, μm2) were calculated. The renal specific blood flow (SBF per unit of kidney weight, KW, mg) was measured by the laser-Doppler flowmeter (in perfusion units, p.u.) under sodium barbamyl narcosis. To assess the relationship of these parameters, we found their allometric association. We have found that, during postnatal growth, glomeruli morphological parameters vary according to the equations: Dgl = 7.1□KW0.41, Ugl = 187□KW1.23, Ngl = 5309□KW−0.63 (KW, mg and for one kidney), Saf = 1.1□Ugl0.35, and Sef = 6.3□Ugl0.14. The renal SBF in 4-, 12-, and 65-day-old rats increases according to SBF = 6.7□(ΣUgl)0.98. The renal SBF calculated per unit of glomeruli volume varies a little with age.
Russian Journal of Developmental Biology – Springer Journals
Published: Jan 20, 2012
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