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Published on: November 1, 2018

Ultrastructural differentiation of the glomerular mesangium from the human metanephros

C Cotrutz, M Constantinov, C Ionescu

    Morphologie Et Embryologie
    |April 1, 1989
    PubMed

    Insights

    Human embryonic kidney mesangial cells begin differentiating around the 12th week, with key developmental milestones achieved by 16 weeks, showing adult-like morphology and function.

    Area of Science:

    • Developmental biology
    • Nephrology
    • Human embryology

    Background:

    • The differentiation of renal corpuscle cells is crucial for kidney development.
    • Understanding the timeline of mesangial cell development provides insights into early nephrogenesis.

    Purpose of the Study:

    • To investigate the developmental timeline of mesangial cells in human embryonic and fetal kidneys.
    • To identify the earliest signs of mesangial cell differentiation and maturation.

    Main Methods:

    • Histological examination of metanephros tissue sections from human embryos and fetuses.
    • Age range of specimens: 8 to 24 weeks of gestation.
    • Microscopic analysis to observe cellular morphology and differentiation markers.

    Main Results:

    • Mesangial cell differentiation commences around the 12th week of gestation.
    • Endocytosis, a characteristic of adult mesangial cells, was observed in some developing cells.
    • The three distinct cell types of the renal corpuscle individualized by the 13th week.
    • Adult morphological features were acquired between the 14th and 16th weeks.

    Conclusions:

    • Mesangial cell differentiation follows a defined developmental trajectory in human kidneys.
    • Early functional characteristics, like endocytosis, appear before full morphological maturation.
    • The study elucidates key developmental stages of the renal corpuscle during human embryogenesis.

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