TY  - JOUR
A1  - Stölting, Miriam
A1  - Wiesner, Christiane
A1  - van Vliet, Vanessa
A1  - Butt, Elke
A1  - Pavenstädt, Hermann
A1  - Linder, Stefan
A1  - Kremerskothen, Joachim
T1  - Lasp-1 Regulates Podosome Function
JF  - PLoS One
N2  - Eukaryotic cells form a variety of adhesive structures to connect with their environment and to regulate cell motility. In contrast to classical focal adhesions, podosomes, highly dynamic structures of different cell types, are actively engaged in matrix remodelling and degradation. Podosomes are composed of an actin-rich core region surrounded by a ring-like structure containing signalling molecules, motor proteins as well as cytoskeleton-associated proteins. Lasp-1 is a ubiquitously expressed, actin-binding protein that is known to regulate cytoskeleton architecture and cell migration. This multidomain protein is predominantely present at focal adhesions, however, a second pool of Lasp-1 molecules is also found at lamellipodia and vesicle-like microdomains in the cytosol. In this report, we show that Lasp-1 is a novel component and regulator of podosomes. Immunofluorescence studies reveal a localization of Lasp-1 in the podosome ring structure, where it colocalizes with zyxin and vinculin. Life cell imaging experiments demonstrate that Lasp-1 is recruited in early steps of podosome assembly. A siRNA-mediated Lasp-1 knockdown in human macrophages affects podosome dynamics as well as their matrix degradation capacity. In summary, our data indicate that Lasp-1 is a novel component of podosomes and is involved in the regulation of podosomal function.
KW  - discrete
KW  - smooth muscle cells
KW  - microdomains
KW  - actin cytoskeleton
KW  - endothelial cells
KW  - epithelial cells
KW  - cancer cells
KW  - phosphorylation
KW  - invadopodia
KW  - dependent protein-kinase
KW  - camp signaling pathway
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-134315
VL  - 7
IS  - 4
ER  - 
TY  - JOUR
A1  - Lepa, Carolin
A1  - Möller‐Kerutt, Annika
A1  - Stölting, Miriam
A1  - Picciotto, Cara
A1  - Eddy, Mee‐Ling
A1  - Butt, Elke
A1  - Kerjaschki, Dontscho
A1  - Korb‐Pap, Adelheid
A1  - Vollenbröker, Beate
A1  - Weide, Thomas
A1  - George, Britta
A1  - Kremerskothen, Joachim
A1  - Pavenstädt, Hermann
T1  - LIM and SH3 protein 1 (LASP‐1): A novel link between the slit membrane and actin cytoskeleton dynamics in podocytes
JF  - The FASEB Journal
N2  - The foot processes of podocytes exhibit a dynamic actin cytoskeleton, which maintains their complex cell structure and antagonizes the elastic forces of the glomerular capillary. Interdigitating secondary foot processes form a highly selective filter for proteins in the kidney, the slit membrane. Knockdown of slit membrane components such as Nephrin or Neph1 and cytoskeletal adaptor proteins such as CD2AP in mice leads to breakdown of the filtration barrier with foot process effacement, proteinuria, and early death of the mice. Less is known about the crosstalk between the slit membrane‐associated proteins and cytoskeletal components inside the podocyte foot processes. Our study shows that LASP‐1, an actin‐binding protein, is highly expressed in podocytes. Electron microscopy studies demonstrate that LASP‐1 is found at the slit membrane suggesting a role in anchoring slit membrane components to the actin cytoskeleton. Live cell imaging experiments with transfected podocytes reveal that LASP‐1 is either part of a highly dynamic granular complex or a static, actin cytoskeleton‐bound protein. We identify CD2AP as a novel LASP‐1 binding partner that regulates its association with the actin cytoskeleton. Activation of the renin‐angiotensin‐aldosterone system, which is crucial for podocyte function, leads to phosphorylation and altered localization of LASP‐1. In vivo studies using the Drosophila nephrocyte model indicate that Lasp is necessary for the slit membrane integrity and functional filtration.
KW  - actin cytoskeleton
KW  - angiotensin
KW  - CD2AP
KW  - nephrocyte
KW  - slit membrane
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-215522
VL  - 34
IS  - 4
SP  - 5453
EP  - 5464
ER  -