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A double-edged sword.

The WNT–β-catenin system is an evolutionary conserved signalling pathway that is of particular importance for morphogenesis and cell organization during embryogenesis. The system is usually suppressed in adulthood; however, it can be re-activated in organ injury and regeneration. WNT-deficient mice display severe kidney defects at birth. Transient WNT–β-catenin activation stimulates tissue regeneration after acute kidney injury, whereas sustained (uncontrolled) WNT–β-catenin signalling promotes kidney fibrosis in chronic kidney disease (CKD), podocyte injury and proteinuria, persistent tissue damage during acute kidney injury and cystic kidney diseases. Additionally, WNT–β-catenin signalling is involved in CKD-associated vascular calcification and mineral bone disease. The WNT–β-catenin pathway is tightly regulated, for example, by proteins of the Dickkopf (DKK) family. In particular, DKK3 is released by ‘stressed’ tubular epithelial cells; DKK3 drives kidney fibrosis and is associated with short-term risk of CKD progression and acute kidney injury. Thus, targeting the WNT–β-catenin pathway might represent a promising therapeutic strategy in kidney injury and associated complications. This Review discusses advances in the understanding of WNT–β-catenin signalling and its regulation during kidney injury, along with its potential diagnostic and therapeutic implications.

WNT–β-catenin signalling — a versatile player in kidney injury and repair

Chronic kidney disease (CKD) is estimated to affect 10-14% of global population. Kidney fibrosis, characterized by excessive extracellular matrix deposition leading to scarring, is a hallmark manifestation in different progressive CKD; However, at present no antifibrotic therapies against CKD exist. Kidney fibrosis is identified by tubule atrophy, interstitial chronic inflammation and fibrogenesis, glomerulosclerosis, and vascular rarefaction. Fibrotic niche, where organ fibrosis initiates, is a complex interplay between injured parenchyma (like tubular cells) and multiple non-parenchymal cell lineages (immune and mesenchymal cells) located spatially within scarring areas. Although the mechanisms of kidney fibrosis are complicated due to the kinds of cells involved, with the help of single-cell technology, many key questions have been explored, such as what kind of renal tubules are profibrotic, where myofibroblasts originate, which immune cells are involved, and how cells communicate with each other. In addition, genetics and epigenetics are deeper mechanisms that regulate kidney fibrosis. And the reversible nature of epigenetic changes including DNA methylation, RNA interference, and chromatin remodeling, gives an opportunity to stop or reverse kidney fibrosis by therapeutic strategies. More marketed (e.g., RAS blockage, SGLT2 inhibitors) have been developed to delay CKD progression in recent years. Furthermore, a better understanding of renal fibrosis is also favored to discover biomarkers of fibrotic injury. In the review, we update recent advances in the mechanism of renal fibrosis and summarize novel biomarkers and antifibrotic treatment for CKD. 

https://www.nature.com/articles/s41392-023-01379-7.pdf

Kidney fibrosis: from mechanisms to therapeutic medicines

The fibrogenic niche in kidney fibrosis: components and mechanisms

Cellular Senescence: The Sought or the Unwanted?

Tubule-derived exosomes play a central role in fibroblast activation and kidney fibrosis

Activation of the renin-angiotensin system (RAS) is associated with hypertension and heart disease. However, how RAS activation causes cardiac lesions remains elusive. Here we report the involvement of Wnt/β-catenin signaling in this process. In rats with chronic infusion of angiotensin II (Ang II), eight Wnt ligands were induced and β-catenin activated in both cardiomyocytes and cardiac fibroblasts. Blockade of Wnt/β-catenin signaling by small molecule inhibitor ICG-001 restrained Ang II-induced cardiac hypertrophy by normalizing heart size and inhibiting hypertrophic marker genes. ICG-001 also attenuated myocardial fibrosis and inhibited α-smooth muscle actin, fibronectin and collagen I expression. These changes were accompanied by a reduced expression of atrial natriuretic peptide and B-type natriuretic peptide. Interestingly, ICG-001 also lowered blood pressure induced by Ang II. In vitro, Ang II induced multiple Wnt ligands and activated β-catenin in rat primary cardiomyocytes and fibroblasts. ICG-001 inhibited myocyte hypertrophy and Snail1, c-Myc and atrial natriuretic peptide expression, and abolished the fibrogenic effect of Ang II in cardiac fibroblasts. Finally, recombinant Wnt3a was sufficient to induce cardiomyocyte injury and fibroblast activation in vitro. Taken together, these results illustrate an essential role for Wnt/β-catenin in mediating hypertension, cardiac hypertrophy and myocardial fibrosis. Therefore, blockade of this pathway may be a novel strategy for ameliorating hypertensive heart disease.

/pdf/an-essential-role-for-wnt-b-catenin-signaling-in-mediating-18chfq8xhp.pdf

An essential role for Wnt/β-catenin signaling in mediating hypertensive heart disease.

Wnt/β-catenin signaling mediates both heart and kidney injury in type 2 cardiorenal syndrome

Identification of matrix metalloproteinase-10 as a key mediator of podocyte injury and proteinuria.

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Papers

Tubule-derived exosomes play a central role in fibroblast activation and kidney fibrosis

An essential role for Wnt/β-catenin signaling in mediating hypertensive heart disease.

Wnt/β-catenin signaling mediates both heart and kidney injury in type 2 cardiorenal syndrome

Identification of matrix metalloproteinase-10 as a key mediator of podocyte injury and proteinuria.