scholarly journals mTORC1-mediated inhibition of polycystin-1 expression drives renal cyst formation in tuberous sclerosis complex

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Monika Pema ◽  
Luca Drusian ◽  
Marco Chiaravalli ◽  
Maddalena Castelli ◽  
Qin Yao ◽  
...  
2021 ◽  
Vol 118 (6) ◽  
pp. e2020190118
Author(s):  
Sharon Barone ◽  
Kamyar Zahedi ◽  
Marybeth Brooks ◽  
Elizabeth P. Henske ◽  
Yirong Yang ◽  
...  

Tuberous sclerosis complex (TSC) is caused by mutations in either TSC1 or TSC2 genes and affects multiple organs, including kidney, lung, and brain. In the kidney, TSC presents with the enlargement of benign tumors (angiomyolipomata) and cysts, which eventually leads to kidney failure. The factors promoting cyst formation and tumor growth in TSC are incompletely understood. Here, we report that mice with principal cell-specific inactivation of Tsc1 develop numerous cortical cysts, which are overwhelmingly composed of hyperproliferating A-intercalated (A-IC) cells. RNA sequencing and confirmatory expression studies demonstrated robust expression of Forkhead Transcription Factor 1 (Foxi1) and its downstream targets, apical H+-ATPase and cytoplasmic carbonic anhydrase 2 (CAII), in cyst epithelia in Tsc1 knockout (KO) mice but not in Pkd1 mutant mice. In addition, the electrogenic 2Cl−/H+ exchanger (CLC-5) is significantly up-regulated and shows remarkable colocalization with H+-ATPase on the apical membrane of cyst epithelia in Tsc1 KO mice. Deletion of Foxi1, which is vital to intercalated cells viability and H+-ATPase expression, completely abrogated the cyst burden in Tsc1 KO mice, as indicated by MRI images and histological analysis in kidneys of Foxi1/Tsc1 double-knockout (dKO) mice. Deletion of CAII, which is critical to H+-ATPase activation, caused significant reduction in cyst burden and increased life expectancy in CAII/Tsc1 dKO mice vs. Tsc1 KO mice. We propose that intercalated cells and their acid/base/electrolyte transport machinery (H+-ATPase/CAII/CLC-5) are critical to cystogenesis, and their inhibition or inactivation is associated with significant protection against cyst generation and/or enlargement in TSC.


2017 ◽  
Vol 48 (S 01) ◽  
pp. S1-S45
Author(s):  
G. Wiegand ◽  
T. Polster ◽  
C. Hertzberg ◽  
A. Wiemer-Kruel ◽  
J. French ◽  
...  

2017 ◽  
Vol 48 (S 01) ◽  
pp. S1-S45
Author(s):  
T. Stapper ◽  
D. Valcheva ◽  
T. Höll ◽  
T. Rosenbaum

2006 ◽  
Vol 37 (03) ◽  
Author(s):  
C Krahn-Peper ◽  
IEB Tuxhorn ◽  
K Ahlbory ◽  
F Behne ◽  
H Pannek

2020 ◽  
Vol 7 (3) ◽  
pp. 5-19
Author(s):  
Nikhil Nair ◽  
Ronith Chakraborty ◽  
Zubin Mahajan ◽  
Aditya Sharma ◽  
Sidarth Sethi ◽  
...  

Tuberous sclerosis complex (TSC) is a genetic condition caused by a mutation in either the TSC1 or TSC2 gene. Disruption of either of these genes leads to impaired production of hamartin or tuberin proteins, leading to the manifestation of skin lesions, tumors and seizures. TSC can manifests in multiple organ systems with the cutaneous and renal systems being the most commonly affected. These manifestations can secondarily lead to the development of hypertension, chronic kidney disease, and neurocognitive declines. The renal pathologies most commonly seen in TSC are angiomyolipoma, renal cysts and less commonly, oncocytomas. In this review, we highlight the current understanding on the renal manifestations of TSC along with current diagnosis and treatment guidelines.


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