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ANG II promotes autophagy in podocytes
Anju Yadav1, Sridevi Vallabu, Shitij Arora
1Department of Medicine, North Shore and Long Island Jewish Health System and Feinstein Institute for Medical Research, Manhasset, New York, USA.
American Journal of Physiology. Cell Physiology
|May 21, 2010
Summary
Angiotensin II (ANG II) triggers autophagy in podocytes, crucial cells of the kidney filtration barrier. This process, mediated by reactive oxygen species (ROS), helps clear damaged components.
Area of Science:
- Nephrology
- Cell Biology
- Molecular Biology
Background:
- Podocytes are vital components of the glomerular filtration barrier (GFB).
- In disease, podocytes face elevated Angiotensin II (ANG II) levels, potentially leading to oxidized proteins and damaged mitochondria.
- Autophagy is a cellular process for degrading damaged components.
Purpose of the Study:
- To investigate the effect of ANG II on the autophagic process in podocytes.
- To determine the role of reactive oxygen species (ROS) in ANG II-induced autophagy.
Main Methods:
- Electron microscopy was used to quantify autophagosomes in control and ANG II-treated mouse podocytes.
- Gene expression of autophagy markers (LC3-2, beclin-1) was analyzed.
- Reactive oxygen species (ROS) generation was measured.
- The effects of autophagy inhibitors and antioxidants were evaluated.
Main Results:
- ANG II treatment significantly increased the number of autophagosomes in podocytes (fivefold).
- ANG II enhanced the expression of autophagic genes LC3-2 and beclin-1.
- ANG II promoted time-dependent ROS generation in podocytes.
- Antioxidants and autophagy inhibitors (3-methyladenine) blocked ANG II-induced autophagy.
Conclusions:
- ANG II promotes podocyte autophagy.
- This effect is mediated through the generation of reactive oxygen species (ROS).
- Autophagy induction by ANG II may represent a protective mechanism against cellular damage in podocytes.
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