1000/1000
Hot
Most Recent
Vascular complications are the leading cause of morbidity and mortality among patients with type 2 diabetes mellitus (T2DM). These vascular abnormalities result in a chronic hyperglycemic state, which influences many signaling molecular pathways that initially lead to increased oxidative stress, increased inflammation, and endothelial dysfunction, leading to both microvascular and macrovascular complications. Endothelial dysfunction represents the initial stage in both types of vascular complications; it represents “mandatory damage” in the development of microvascular complications and only “introductory damage” in the development of macrovascular complications. Increasing scientific evidence has revealed an important role of the Wnt pathway in the pathophysiology of the vascular wall. It is well known that the Wnt pathway is altered in patients with T2DM.
Figure 2. This scheme summarizes the micro- (retinopathy, nephropathy, and neuropathy) and macrovascular (coronary artery disease, cerebrovascular disease, and peripheral arterial disease) complications associated with type 2 diabetes mellitus (T2DM) and their possible association with the Wingless-Int (Wnt) signaling pathway. Created with BioRender.com.
Table 1. Components of the Wnt pathway that can be altered in the microvascular complications of T2DM.1
Disease | Event | Component | Expression | In Vitro | In Vivo | Reference |
---|---|---|---|---|---|---|
Microvascular | Retinopathy | β-catenin | ↑ | Inflammation and angiogenesis | Retinal inflammation and vascular leakage | [20] |
LRP5/6 | ↑ | Inflammation and angiogenesis | Retinal inflammation and vascular leakage | [20] | ||
↓ | Lack of deeper retinal vessels | Significant decrease in pathological retinal neovascularization Significant decrease in retinal vascularization during development Affects blood–retinal barrier formation |
[21] | |||
Dkk1 | ↑ | Inhibition of the generation of reactive oxygen species (ROS) | Mitigated retinal inflammation and blocked overexpression of proinflammatory factors such as ICAM-1 and COX-2 Reduction in retinal vascular leakage and improvement of ischemia-induced retinal neovascularization |
[20] | ||
Frizzled4 | ↑ | Angiogenesis | Pathological neovascularization | [21] | ||
Dvl2 | ↓ | Impaired angiogenesis | Significant decrease in pathological retinal neovascularization | [21] | ||
Claudin-5 | ↓ | Significant suppression of endothelial cell sprouting | Suppression of pathological vascular growth and development | [21] | ||
Frizzled7 | ↑ | Inflammation, angiogenesis, and oxidative stress | Pathological neovascularization | [22] | ||
SERPINA3K | ↑ | Inhibition of connective tissue growth factor overexpression | Antioxidation Anti-inflammatory Antifibrosis |
[23] | ||
VLDLR | ↑ | Anti-angiogenesis Inhibited endothelial cell proliferation, migration, and tube formation |
Improvement of ocular neovascularization, | [24] | ||
Endostatin | ↑ | Impaired angiogenesis | Reduced VEGF-induced retinal vascular permeability, neovascularization, and retinal detachment | [25] | ||
Kallistatin | ↑ | Anti-inflammation Anti-angiogenesis |
Attenuation of ischemia-induced retinal neovascularization | [26] | ||
PEDF | ↑ | Anti-inflammation Anti-angiogenesis |
Ameliorated retinal inflammation, vascular leakage, and neovascularization | [27] | ||
MiARN-184 | ↑ | Anti-angiogenesis | Improves inflammatory responses, vascular leakage, and neovascularization. | [28] | ||
Nephropathy | β-catenin | ↑ | Reduced mesangial cell apoptosis Podocyte dysfunction |
Glomerular albuminuria and subsequent glomerular injury | [29] | |
↓ | Mesangial cells apoptosis | Increased severity of streptozotocin-induced diabetes nephritis | [29] | |||
LEF1 | ↑ | Enhanced proliferation and metastasis of renal cells | Renal cell carcinoma (RCC) | [30] | ||
LRP6 | ↓ | Mesangial cell apoptosis | Attenuated renal inflammation, reduced proteinuria, and ameliorated fibrosis | [31] | ||
Wnt4 | ↑ | Stimulation of mesenchymal-to-epithelial differentiation Podocyte dysfunction |
Tubulo-interstitial fibrosis Glomerular albuminuria and subsequent glomerular injury |
[29] | ||
↓ | Mesangial cell apoptosis | Kidney tissue disorganization, as well as disease development and progression | [32] | |||
Dkk1 | ↑ | Amelioration of podocyte apoptosis and viability | Restored podocyte function and decreased albuminuriaBone-mineral disorder syndrome | [29][33] | ||
TRPC6 | ↑ | Podocyte injury | Excessive calcium influx in podocytes leading to foot process effacement, podocyte apoptosis, and subsequent glomerular damage | [29] | ||
Wnt9a | ↑ | Evoking of cell communication between senescent tubular cells and interstitial fibroblasts | Tubular senescence and renal fibrosis | [34] | ||
Wnt5a | ↑ | Increased ROS production | Mesangial cell apoptosis | [35] | ||
CTGF/CCN2 | ↑ | LRP6 phosphorylation and accumulation of β-catenin | Attenuated renal inflammation, reduced proteinuria, and ameliorated fibrosis Mesangial cell apoptosis |
[31] | ||
CTNNB1 | ↓ | Improved podocyte motility | Damage to the basement membrane, albuminuria, and increased susceptibility to glomerular injury | [35] | ||
Wnt6 | ↓ | Damaged tubulo-interstitium | Renal fibrosis | [36] | ||
Neuropathy | PORCN | ↓ | Slightly reduced expression of Wnt3a Significantly reduced expression of β-catenin, Dvl1, c-myc, GRP78, and MMP2 in the sciatic nerve |
Decreased heat- and cold-induced hyperalgesia Increased motor nerve conduction speed Increased sensory nerve conduction speed Increased nerve blood flow Increased density of intraepidermal nerve fibers |
[37] | |
Dvl | ↓ | Significantly reduced expression of β-catenin, Dvl1, c-myc, GRP78, and MMP2 in the sciatic nerve | Decreased heat- and cold-induced hyperalgesia Increased motor nerve conduction speed Increased sensory nerve conduction speed Increased nerve blood flow Increased density of intraepidermal nerve fibers |
[37] | ||
β-catenin | ↓ | Significantly reduced expression of β-catenin, Dvl1, c-myc, GRP78, and MMP2 in the sciatic nerve | Decreased heat- and cold-induced hyperalgesia Increased motor nerve conduction speed Increased sensory nerve conduction speed Increased nerve blood flow Increased density of intraepidermal nerve fibers |
[37] | ||
Wnt3a | ↑ | Release of brain-derived neurotrophic factor in microglial cells | Allodynia | [38] | ||
XAV939 | ↑ | - | Effective attenuation of neuropathic pain induction Drastic attenuation of the development of allodynia |
[38] |
Disease | Event | Component | Expression | In Vitro | In Vivo | Reference |
---|---|---|---|---|---|---|
Macrovascular | Coronary artery disease | Scl | ↑ | Endothelial dysfunction, alteration on proliferation, and migration of vascular smooth muscle cells | Atherosclerotic process, abnormal intima-media thickness, carotid plaques, aortic calcifications, and mortality | [44][45] |
Dkk-1 | ↑ | Regulates platelet-mediated inflammation and contributes to plaque de-escalation | Ischemic stroke and cardiovascular death | [46] | ||
↑ | Endothelial activation and release of inflammatory cytokines Endothelial–mesenchymal transition in aortic endothelial cells |
Onset and progression of atherosclerosis | [47] | |||
LRP6 | ↓ | LDL uptake was significantly lower in lymphoblastoid cells | Elevated plasma cholesterol and elevated plasma LDL, triglyceride, and fatty liver levels | [48] | ||
Wnt5a | ↑ | Induction of inflammatory gene expression GM-CSF, IL-1a, IL-3, IL-5, IL-6, IL-7, IL-8, CCL2, CCL8, and COX-2 in human aortic endothelial cells | Elevation of triglyceride levels, vascular insulin resistance, and endothelial dysfunction | [49] | ||
↑ | Macrophage activation | Increased recruitment of inflammatory cells and amplified inflammatory response | [50] | |||
Dkk-3 | ↓ | Increased intima-media thickness of the carotid artery | Delayed reendothelialization and aggravated neointima formation | [51] | ||
↑ | Induces differentiation of vascular progenitors and fibroblasts into smooth muscle cells | Larger and more vulnerable atherosclerotic lesions with more macrophages, fewer smooth muscle cells, and less extracellular matrix deposition | [52] | |||
TCF7L2 | ↓ | Loss of differentiation of vascular smooth muscle cells | Medial aortic hyperplasia | [53] | ||
Wnt2 | ↑ | Regulates smooth muscle cell migration | Triggers intima-media thickening | [54] | ||
LRP5 | ↓ | Activation of proinflammatory genes (interferon γ, IL15, IL18, and TNF ligand superfamily 13b). | Larger aortic atherosclerotic lesions | [55] | ||
Cerebrovascular disease | Scl | ↑ | Arterial calcification | Ischemic stroke caused by atherosclerotic stroke of large arteries or occlusion of small arteries | [56] | |
Dkk1 | ↑ | Biomarker for the presence of coronary atherosclerotic plaque | Carotid atherosclerosis, stable angina, and myocardial infarction Poor prognosis 1 year after ischemic stroke |
[57] | ||
miR-150-5p | ↑ | Regulates the Wnt signaling pathway and participates in cell proliferation and apoptosis by downregulating p53 | Inhibition of cell proliferation, colony formation, and tumor growth | [58] | ||
↓ | CD133− cells acquire a stem-cell-like phenotype | >Glioma | [59] | |||
β-catenin | ↑ | Key regulators for cadherin-mediated cell–cell adhesion |
Glioma Higher degree of malignancy of the tumor |
[59] | ||
Wnt1 | ↓ | Neuronal disappearance and increasing functional deficits | Oxidant stress and cerebral ischemia | [60] | ||
claudin-1 | ↓ | Neuronal damage | Increased permeability of the blood–brain barrier, petechial hemorrhage in the brain, neuronal injury, and central nervous system inflammation | [61] | ||
Claudin-3 | ↓ | Neuronal damage | Intracerebral petechial hemorrhages | [62] | ||
Wnt3a | ↑ | Alleviates neuronal apoptosis at the cellular and subcellular levels | Neuroprotection in traumatic brain injury, and ischemic stroke | [63] | ||
LRP6 | ↓ | Increased expression of inflammatory genes after middle artery occlusion | Risk of ischemic stroke, larger heart attack, and severe motor deficits | [64] | ||
Wnt5 | ↑ | Enhanced endothelial activation type 1 inflammatory mediator to promote endothelial activation type 2 | Brain aging Inflamed atheroma plaques |
[65] | ||
miRNA-148b | ↓ | Attenuates neural stem-cell proliferation and differentiation | Reduces ischemic injury and improves neurological function | [66] | ||
Peripheral arterial disease | Wnt5a | ↑ | Endothelial dysfunction | Increased risk of peripheral arterial occlusive disease, as well as metabolic and cardiovascular disorders | [67] | |
Sfrp5 | ↓ | Inhibition of cardiac fibroblast proliferation and migration Inflammation and myocardial injury |
ST-segment elevation myocardial infarction, metabolic syndrome, and increased risk of peripheral arterial occlusive disease | [67] | ||
CTHRC1 | ↑ | Synovial hyperplasia, contributes to the inflammatory microenvironment, and promotes pannus invasion through increased motility and invasion of synoviocytes | Increased risk of systemic lupus erythematosus, development of rheumatoid arthritis, and severity of the disease | [68] | ||
ALKBH5 | ↑ | Reduced proliferation and migration and decreased viability in hypoxic cardiac microvascular endothelial cells | Impaired hypoxic tube formation, but not the normoxic cardiac microvascular endothelial cells | [69] |