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Glomerular morphometry in the Munich-Wistar rat.

S M Shea, J Raskova

    Microcirculation, Endothelium, and Lymphatics
    |January 1, 1985
    PubMed
    Summary
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    Glomerular filtration coefficient (Kf) studies in Munich Wistar rats require accurate anatomical data. Larger, mature rats (300g) show superficial glomeruli comparable to juxtamedullary ones, unlike smaller rats (200g).

    Area of Science:

    • Nephrology
    • Renal Physiology
    • Morphometry

    Background:

    • Physiological studies of glomerular function in rats, particularly the glomerular ultrafiltration coefficient (Kf), rely on accessible superficial glomeruli.
    • The Munich Wistar (MW) rat strain offers such accessibility, but anatomical variations can confound Kf interpretation.
    • Glomerular filtration surface area varies with rat body weight (BW) and glomerular position.

    Purpose of the Study:

    • To determine appropriate anatomical values for interpreting Kf in MW rats.
    • To investigate the impact of body weight and glomerular position on glomerular morphology and filtration surface area.

    Main Methods:

    • A morphometric study using electron microscopy was conducted on two groups of male MW rats (approx. 200g and 300g BW).

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  • Glomerular volume and anatomical filtration surface area were measured for superficial cortical (SC), midcortical (MC), and juxtamedullary (JM) glomeruli.

    • Main Results:

    • MW rats at ~200g BW exhibited smaller SC and MC glomeruli with lower filtration surface areas.
    • MW rats at ~300g BW displayed larger SC and MC glomeruli, comparable in size to JM glomeruli.
    • The anatomical filtration surface areas in ~300g MW rats were consistent with values typically used in physiological studies.

    Conclusions:

    • Superficial glomeruli in MW rats mature with increasing body weight.
    • The maturation leads to larger glomerular size and filtration surface area in adult rats (~300g BW).
    • These findings provide crucial anatomical data for accurate physiological interpretation of Kf in MW rats.