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Related Experiment Videos

Quantitative imaging of basic functions in renal (patho)physiology.

Jung Julie Kang1, Ildiko Toma, Arnold Sipos

  • 1Department of Physiology, Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, California 90033, USA.

American Journal of Physiology. Renal Physiology
|April 13, 2006
PubMed
Summary

Multiphoton fluorescence microscopy noninvasively visualizes kidney function in real time. This advanced imaging quantifies glomerular filtration rate, blood flow, and tubuloglomerular feedback dynamics.

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Area of Science:

  • Nephrology
  • Physiology
  • Biomedical Imaging

Background:

  • Multiphoton fluorescence microscopy enables deep tissue imaging with minimal phototoxicity and high resolution.
  • It allows real-time, noninvasive visualization and quantification of dynamic physiological processes in intact organs.

Purpose of the Study:

  • To extend multiphoton fluorescence imaging methods for direct observation and quantification of kidney physiological parameters.
  • To investigate glomerular filtration rate (GFR), permeability, blood flow, urinary concentration, renin dynamics, and tubuloglomerular feedback (TGF).

Main Methods:

  • Application of multiphoton fluorescence microscopy to living tissue.
  • Induction of diabetes using streptozotocin.
  • Administration of furosemide, a loop diuretic.

Related Experiment Videos

  • Measurement of red blood cell velocity in glomerular and peritubular capillaries.

    • Main Results:

    • Diabetes significantly increased single-nephron GFR (SNGFR) and glomerular permeability.
    • Furosemide induced tubular fluid dilution, increased fluid volume, and released juxtaglomerular renin.
    • Red blood cell speeds differed significantly between intraglomerular and peritubular capillaries.
    • Observed oscillations in glomerular filtration and tubular flow, with delays in proximal and distal tubules.

    Conclusions:

    • Multiphoton fluorescence microscopy provides a dynamic and detailed portrayal of renal function.
    • This technology elucidates mechanisms of normal physiology and pathophysiology in the kidney.
    • The study successfully quantified key renal parameters and feedback mechanisms in real time.