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The pathogenesis of CKD complications; Attack of dysregulated iron and phosphate metabolism
Takeshi Nakanishi1, Masayoshi Nanami2, Takahiro Kuragano2
1Department of Nephrology, Sumiyoshigawa Hospital, Japan; Department of Internal Medicine, Division of Kidney and Dialysis, Hyogo College of Medicine, Japan.
Insights
Chronic kidney disease (CKD) patients face higher risks of cardiovascular disease and infection. Managing phosphate levels and minimizing iron overload are key to mitigating these serious CKD complications.
Area of Science:
- Nephrology
- Cardiology
- Immunology
Background:
- Chronic kidney disease (CKD) patients exhibit significantly elevated risks for cardiovascular disease (CVD) and infections compared to the general population.
- These heightened risks are potentially linked to the combined effects of hyperphosphatemia and disordered iron metabolism in CKD.
- Hyperphosphatemia is implicated in vascular calcification and mitochondrial dysfunction, while iron dysregulation impacts both cardiovascular health and immune response.
Purpose of the Study:
- To explore the intertwined roles of hyperphosphatemia and iron misdistribution in the pathogenesis of cardiovascular disease and infection in CKD patients.
- To investigate potential mechanisms linking elevated phosphate levels and altered iron status to adverse outcomes in CKD.
- To identify therapeutic targets for reducing the incidence of CVD and infection in CKD.
Main Methods:
- Review of existing literature on the pathophysiology of CKD, hyperphosphatemia, iron metabolism, CVD, and infection.
- Analysis of proposed mechanisms including the role of fibroblast growth factor-23 (FGF-23) and non-transferrin-bound iron (NTBI).
- Hypothesizing the impact of phosphate and iron levels on leukocyte function and host defense.
Main Results:
- Hyperphosphatemia contributes to vascular calcification and apoptosis, potentially accelerated by reactive oxygen species (ROS) generated from intracellular iron.
- Pathogen virulence is linked to iron acquisition, and excessive iron administration can impair host immune cell function.
- Increased fibroblast growth factor-23 (FGF-23) and circulating non-transferrin-bound iron (NTBI) are hypothesized mechanisms linking high phosphate to impaired host defense.
Conclusions:
- Maintaining appropriate serum phosphate levels is crucial for managing CKD complications.
- Minimizing intracellular iron accumulation may help attenuate the development of cardiovascular disease and infection in CKD patients.
- Targeting phosphate and iron metabolism represents a promising strategy for improving outcomes in chronic kidney disease.
Abstract:
Chronic kidney disease (CKD) patients have a tremendously higher risk of developing cardiovascular disease (CVD) and infection than the non-CKD population, which could be caused by intertwining actions of hyperphosphatemia and CKD associated misdistribution of iron. CVD is often associated with vascular calcification, which has been attributed to hyperphosphatemia, and could be initiated in mitochondria, inducing apoptosis, and accelerated by reactive oxygen species (ROS). The production of ROS is principally linked to intracellular ferrous iron. For infection, the virulence and pathogenicity of a pathogen is directly related to its capacity to acquire iron for proliferation and to escape or subvert the host's immune response. Iron administration for renal anemia can sometimes be overdosed, which could decrease host immune mechanisms through its direct effect on neutrophils, macrophages and T cell function. Hyperphosphatemia has been demonstrated to be associated with an increased incidence of infection. We hypothesized two possible mechanisms: 1) fibroblast growth factor-23 levels are increased in parallel with serum phosphate levels and directly impair leukocyte recruitment and host defense mechanisms, and 2) circulating non-transferrin-bound iron (NTBI) is increased due to decreased iron binding capacity of the carrier protein transferrin in high-phosphate conditions. From these observations, maintaining an adequate serum range of phosphate levels and minimizing intracellular iron accumulation could attenuate the development of CKD complications.
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