[Atherosclerosis and uremia: signifance of non-traditional risk factors]

Area of Science:

• Nephrology
• Cardiovascular Medicine
• Biochemistry

Background:

• Chronic renal failure is linked to high rates of arteriosclerosis, atherosclerosis, and vascular calcification, significantly increasing patient morbidity and mortality.
• Uremia, dialysis, and iron therapy induce oxidative and carbonyl stress, leading to the formation of advanced glycation end-products (AGEs), advanced lipoxidation end-products (ALEs), and advanced oxidation protein products (AOPPs).
• Elevated C-reactive protein (CRP), homocysteine, and asymmetric dimethylarginine (ADMA) levels, along with hyperphosphatemia and increased calcium x phosphorus product in chronic renal insufficiency, exacerbate cardiovascular risks.

Purpose of the Study:

• To elucidate the complex mechanisms underlying arteriosclerosis, atherosclerosis, and vascular calcification in patients with chronic renal failure.
• To identify key molecular and biochemical factors contributing to cardiovascular and cerebrovascular complications in uremia.
• To highlight the association between specific biochemical markers and patient outcomes in chronic kidney disease.

Main Methods:

• Review and synthesis of existing literature on the pathophysiology of vascular complications in chronic renal failure.
• Analysis of the roles of oxidative stress, carbonyl stress, and specific protein products (AGEs, ALEs, AOPPs) in disease progression.
• Examination of the contribution of factors like hyperphosphatemia, calcium x phosphorus product, fetuin deficiency, homocysteine, and ADMA.

Main Results:

• Oxidative and carbonyl stress contribute to AGE, ALE, and AOPP formation, promoting cardiovascular and cerebrovascular complications, especially with elevated CRP.
• Hyperphosphatemia, increased calcium x phosphorus product, and fetuin deficiency are associated with increased morbidity and mortality.
• Phosphorus, AGEs, and AOPPs catalyze the transformation of vascular smooth muscle cells into osteoblast-like cells, leading to vascular calcification.

Conclusions:

• Arteriosclerosis, atherosclerosis, and vascular calcification in uremia are multifactorial, involving oxidative stress, advanced end-products, altered mineral metabolism, and other risk factors.
• Despite a growing understanding of these mechanisms, effective therapeutic strategies to mitigate the excess mortality associated with these conditions in uremic patients remain elusive.
• Further research is needed to develop targeted interventions to reduce cardiovascular risk and improve survival in patients with chronic kidney disease.