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Visualizing the mouse podocyte with multiphoton microscopy.

Charbel C Khoury1, Mark F Khayat, Tet-Kin Yeo

  • 1Division of Nephrology/Hypertension, Northwestern University, Chicago, IL, USA. khoury.charbel@gmail.com

Biochemical and Biophysical Research Communications
|October 2, 2012
PubMed
Summary
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Multiphoton microscopy visualizes green fluorescent podocytes in a novel mouse model, enabling new research into kidney diseases. This technique allows detailed imaging of podocytes without affecting kidney function.

Area of Science:

  • Nephrology
  • Cell Biology
  • Microscopy

Background:

  • Podocytes are specialized kidney cells crucial for glomerular filtration and are implicated in kidney diseases causing proteinuria.
  • Current research methods have limitations in studying podocyte behavior and function.
  • Novel imaging techniques are required to advance podocyte research.

Purpose of the Study:

  • To develop and validate a new method for visualizing podocytes in vivo.
  • To utilize multiphoton microscopy (MPM) for imaging fluorescently labeled podocytes.
  • To establish a mouse model suitable for intravital podocyte studies.

Main Methods:

  • Utilized a nephrin knockout/green fluorescent protein (GFP) knock-in heterozygote mouse model (Nphs1(tm1Rkl)/J).
  • Employed multiphoton microscopy (MPM) to image GFP-expressing podocytes in intact kidneys.

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  • Compared imaging results with wildtype mice lacking podocyte fluorescence.

    • Main Results:

    • MPM successfully visualized green fluorescent podocytes and their fine structures, like secondary processes, in the Nphs1(tm1Rkl)/J mouse model.
    • No significant phenotypic differences were observed between the genetically modified and wildtype mice.
    • Female mice were identified as preferable for MPM due to shallower glomeruli proximity to the kidney capsule.

    Conclusions:

    • MPM enables unequivocal visualization of fluorescent podocytes in a phenotypically normal mouse model.
    • This technique facilitates intravital studies of podocytes, advancing research into glomerular diseases.
    • The established method provides a valuable tool for understanding podocyte biology and pathology.