Developmental Disorders of the Lymphatics

An information blog for disorders of the lymphatics. For all articles, please click on "Archives" - Due to spammers, I will no longer allow comments, sorry.

Friday, February 01, 2013

A pathway for unicellular tube extension depending on the lymphatic vessel determinant Prox1 and on osmoregulation.


A pathway for unicellular tube extension depending on the lymphatic vessel determinant Prox1 and on osmoregulation.


Jan 2013

Source

1] IGBMC, Development and Stem Cells Program, CNRS (UMR7104)/INSERM (U964)/Universit√© de Strasbourg, 1 rue Laurent Fries, BP.10142, 67400 Illkirch, France [2].

Abstract


The mechanisms regulating the extension of small unicellular tubes remain poorly defined. Here we identify several steps in Caenorhabditis elegans excretory canal growth, and propose a model for lumen extension. Our results suggest that the basal and apical excretory membranes grow sequentially: the former extends first like an axon growth cone; the latter extends next as a result of an osmoregulatory activity triggering peri-apical vesicles (a membrane reservoir) to fuse with the lumen. An apical cytoskeletal web including intermediate filaments and actin crosslinking proteins ensures straight regular lumengrowth. Expression of several genes encoding proteins mediating excretory lumen extension, such as the osmoregulatory STE20-like kinase GCK-3 and the intermediate filament IFB-1, is regulated by ceh-26 (here referred to as pros-1), which we found essential for excretory canal formation. Interestingly, PROS-1 is homologous to vertebrate Prox1, a transcription factor controlling lymphatic vessel growth. Our findings have potential evolutionary implications for the origin of fluid-collecting organs, and provide a reference for lymphangiogenesis.

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