Université de Fribourg

Arp3 controls the podocyte architecture at the kidney filtration barrier

Schell, Christoph ; Sabass, Benedikt ; Helmstaedter, Martin ; Geist, Felix ; Abed, Ahmed ; Yasuda-Yamahara, Mako ; Sigle, August ; Maier, Jasmin I. ; Grahammer, Florian ; Siegerist, Florian ; Artelt, Nadine ; Endlich, Nicole ; Kerjaschki, Dontscho ; Arnold, Hans-Henning ; Dengjel, Jörn ; Rogg, Manuel ; Huber, Tobias B.

In: Developmental Cell, 2018, vol. 47, no. 6, p. 741-757.e8

Podocytes, highly specialized epithelial cells, build the outer part of the kidney filtration barrier and withstand high mechanical forces through a complex network of cellular protrusions. Here, we show that Arp2/3-dependent actin polymerization controls actomyosin contractility and focal adhesion maturation of podocyte protrusions and thereby regulates formation, maintenance, and capacity...

Université de Fribourg

MTOR regulates endocytosis and nutrient transport in proximal tubular cells

Grahammer, Florian ; Ramakrishnan, Suresh K. ; Rinschen, Markus M. ; Larionov, Alexey A. ; Syed, Maryam ; Khatib, Hazim ; Roerden, Malte ; Sass, Jörn Oliver ; Helmstaedter, Martin ; Osenberg, Dorothea ; Kühne, Lucas ; Kretz, Oliver ; Wanner, Nicola ; Jouret, Francois ; Benzing, Thomas ; Artunc, Ferruh ; Huber, Tobias B. ; Theilig, Franziska

In: Journal of the American Society of Nephrology, 2016, p. -

Renal proximal tubular cells constantly recycle nutrients to ensure minimal loss of vital substrates into the urine. Although most of the transport mechanisms have been discovered at the molecular level, little is known about the factors regulating these processes. Here, we show that mTORC1 and mTORC2 specifically and synergistically regulate PTC endocytosis and transport processes. Using a...