Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\25446529
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Dev+Biol
2014 ; 396
(2
): 183-200
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Zebrafish pronephros tubulogenesis and epithelial identity maintenance are
reliant on the polarity proteins Prkc iota and zeta
#MMPMID25446529
Gerlach GF
; Wingert RA
Dev Biol
2014[Dec]; 396
(2
): 183-200
PMID25446529
show ga
The zebrafish pronephros provides an excellent in vivo system to study the
mechanisms of vertebrate nephron development. When and how renal progenitors in
the zebrafish embryo undergo tubulogenesis to form nephrons is poorly understood,
but is known to involve a mesenchymal to epithelial transition (MET) and the
acquisition of polarity. Here, we determined the precise timing of these events
in pronephros tubulogenesis. As the ternary polarity complex is an essential
regulator of epithelial cell polarity across tissues, we performed gene knockdown
studies to assess the roles of the related factors atypical protein kinase C iota
and zeta (prkc?, prkc?). We found that prkc? and prkc? serve partially redundant
functions to establish pronephros tubule epithelium polarity. Further, the loss
of prkc? or the combined knockdown of prkc?/? disrupted proximal tubule
morphogenesis and podocyte migration due to cardiac defects that prevented normal
fluid flow to the kidney. Surprisingly, tubule cells in prkc?/? morphants
displayed ectopic expression of the transcription factor pax2a and the
podocyte-associated genes wt1a, wt1b, and podxl, suggesting that prkc?/? are
needed to maintain renal epithelial identity. Knockdown of genes essential for
cardiac contractility and vascular flow to the kidney, such as tnnt2a, or
elimination of pronephros fluid output through knockdown of the intraflagellar
transport gene ift88, was not associated with ectopic pronephros gene expression,
thus suggesting a unique role for prkc?/? in maintaining tubule epithelial
identity separate from the consequence of disruptions to renal fluid flow.
Interestingly, knockdown of pax2a, but not wt1a, was sufficient to rescue ectopic
tubule gene expression in prkc?/? morphants. These data suggest a model in which
the redundant activities of prkc? and prkc? are essential to establish tubule
epithelial polarity and also serve to maintain proper epithelial cell type
identity in the tubule by inhibiting pax2a expression. These studies provide a
valuable foundation for further analysis of MET during nephrogenesis, and have
implications for understanding the pathways that affect nephron epithelial cells
during kidney disease and regeneration.