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XB-ART-39488
Dev Biol June 15, 2009; 330 (2): 273-85.

LIMK1 acts downstream of BMP signaling in developing retinal ganglion cell axons but not dendrites.

Hocking JC , Hehr CL , Bertolesi G , Funakoshi H , Nakamura T , McFarlane S .


Abstract
The actin cytoskeleton inside extending axonal and dendritic processes must undergo continuous assembly and disassembly. Some extrinsic factors modulate actin turnover through controlling the activity of LIM kinase 1 (LIMK1), which phosphorylates and inactivates the actin depolymerizing factor cofilin. Here, we for the first time examine the function and regulation of LIMK1 in vivo in the vertebrate nervous system. Upon expression of wildtype or kinase-dead forms of the protein, dendrite growth by Xenopus retinal ganglion cells (RGCs) was unchanged. In contrast, maintaining a low, but significant level, of LIMK1 function in the RGC axon is critical for proper extension. Interestingly, bone morphogenetic protein receptor II (BMPRII) is a major regulator of LIMK1 in extending RGC axons, as expression of a BMPRII lacking the LIMK1 binding region caused a dramatic shortening of the axons. Previously, we found that BMPRIIs stimulate dendrite initiation in vivo. Thus, the fact that manipulation of LIMK1 activity failed to alter dendrite growth suggests that BMPs may activate distinct signalling pathways in axons and dendrites.

PubMed ID: 19361494
Article link: Dev Biol

Genes referenced: actl6a bmp2 bmp4 bmp7.1 bmp7.2 bmpr2 cfl1 clstn2 lbr limk1 limk2 myc tec
Antibodies: Limk1 Ab1 Limk2 Ab1


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