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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Dis+Model+Mech
2016 ; 9
(2
): 165-76
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gab.com Text
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ER stress and basement membrane defects combine to cause glomerular and tubular
renal disease resulting from Col4a1 mutations in mice
#MMPMID26839400
Jones FE
; Bailey MA
; Murray LS
; Lu Y
; McNeilly S
; Schlötzer-Schrehardt U
; Lennon R
; Sado Y
; Brownstein DG
; Mullins JJ
; Kadler KE
; Van Agtmael T
Dis Model Mech
2016[Feb]; 9
(2
): 165-76
PMID26839400
show ga
Collagen IV is a major component of basement membranes, and mutations in COL4A1,
which encodes collagen IV alpha chain 1, cause a multisystemic disease
encompassing cerebrovascular, eye and kidney defects. However, COL4A1 renal
disease remains poorly characterized and its pathomolecular mechanisms are
unknown. We show that Col4a1 mutations in mice cause hypotension and renal
disease, including proteinuria and defects in Bowman's capsule and the glomerular
basement membrane, indicating a role for Col4a1 in glomerular filtration.
Impaired sodium reabsorption in the loop of Henle and distal nephron despite
elevated aldosterone levels indicates that tubular defects contribute to the
hypotension, highlighting a novel role for the basement membrane in vascular
homeostasis by modulation of the tubular response to aldosterone. Col4a1
mutations also cause diabetes insipidus, whereby the tubular defects lead to
polyuria associated with medullary atrophy and a subsequent reduction in the
ability to upregulate aquaporin 2 and concentrate urine. Moreover, haematuria,
haemorrhage and vascular basement membrane defects confirm an important vascular
component. Interestingly, although structural and compositional basement membrane
defects occurred in the glomerulus and Bowman's capsule, no tubular basement
membrane defects were detected. By contrast, medullary atrophy was associated
with chronic ER stress, providing evidence for cell-type-dependent molecular
mechanisms of Col4a1 mutations. These data show that both basement membrane
defects and ER stress contribute to Col4a1 renal disease, which has important
implications for the development of treatment strategies for collagenopathies.