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Related Experiment Videos

Neutral endopeptidase expression in mesangial cells.

Fabiana Ebihara1, Giovana Seno Di Marco, Maria Aparecida Juliano

  • 1Nephrology Division, Federal University of Sao Paulo, Sao Paulo, Brazil.

Journal of the Renin-Angiotensin-Aldosterone System : JRAAS
|December 23, 2003
PubMed
Summary

Researchers identified neutral endopeptidase-like activity (NEP-like) in mouse kidney mesangial cells. This enzyme metabolizes peptides crucial for blood pressure and sodium balance, suggesting a key role in renal physiology.

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Area of Science:

  • Nephrology
  • Biochemistry
  • Enzymology

Background:

  • Neutral endopeptidase (NEP) plays a vital role in kidney function, regulating peptides involved in blood pressure and sodium homeostasis.
  • Mouse mesangial cells are critical for glomerular function and renin-angiotensin system component synthesis.

Purpose of the Study:

  • To investigate the presence and characteristics of NEP-like activity in mouse mesangial cells.
  • To understand the enzyme's potential role in renal physiology.

Main Methods:

  • Purification of NEP-like activity from mesangial cell lysate using ion-exchange and gel filtration chromatography.
  • Enzyme characterization including substrate specificity, pH optimum, K(m) determination, and molecular mass analysis.
  • Sequencing of the purified enzyme and comparison with known NEP sequences.

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Main Results:

  • A NEP-like enzyme was successfully purified from mouse mesangial cells.
  • The enzyme hydrolyzes bradykinin at the G4-F5 bond and is inhibited by thiorphan.
  • Optimal activity was observed at pH 7.5, with a K(m) of 4.86 µM for Abz-DRRL-EDDnp. The enzyme has a molecular mass of 95 kDa and shows sequence similarity to known NEPs.

Conclusions:

  • This study reports the first isolation of NEP-like activity from mesangial cells.
  • The identified enzyme likely contributes to renal physiology by metabolizing vasoactive peptides, influencing renal hemodynamics.