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Toxic Nephropathies of the Tubulointerstitium: Core Curriculum 2024
Namrata Krishnan1, Dennis G Moledina2, Mark A Perazella1
1Section of Nephrology, Department of Internal Medicine, School of Medicine, Yale University, New Haven; Section of Nephrology, Veterans Affairs Medical Center, West Haven, Connecticut.
Abstract:
Toxic nephropathies are a clinically common group of disorders characterized by toxin-induced renal injury that can affect the glomerulus, vasculature, or tubulointerstitium. Various endogenous (eg, myoglobin, hemoglobin, monoclonal light chains, and lysozymes) and exogenous toxins (eg, therapeutic drugs, herbal medications, heavy metals, radiocontrast, intoxicants, and environmental exposures) have been implicated. The kidney's primary role of metabolism and excretion of substances via glomerular filtration and tubular secretion increases its susceptibility to their adverse effects. The structure, dose, metabolic handling, and excretory pathway of the drug/toxin through the kidney determines its nephrotoxic risk. Patient characteristics that impact risk include genetic determinants of drug metabolism, transport and excretion, immune response genes, and comorbid conditions. Clinical manifestations depend on site and severity of renal injury. Toxin-induced tubulointerstitial injury often presents as a decline in renal function and/or solute transport defects and renal solute wasting. Injury is often reversible with limited toxin exposure; however, irreversible renal injury can occur with prolonged exposure. In this Core Curriculum, we will focus on discussing mechanisms of common toxin-induced tubulointerstitial renal injury and review their causes, clinical presentations, diagnosis, and management.
Insights
Toxic nephropathies cause kidney injury through various substances. Understanding toxin mechanisms, patient factors, and kidney function is key for managing and preventing renal damage.
Area of Science:
- Nephrology
- Toxicology
- Internal Medicine
Background:
- Toxic nephropathies are common kidney disorders caused by endogenous and exogenous toxins.
- Kidney susceptibility arises from its roles in metabolism and excretion.
- Risk factors include toxin properties and patient-specific genetic and health factors.
Purpose of the Study:
- To detail the mechanisms of toxin-induced tubulointerstitial renal injury.
- To review the causes, clinical presentations, diagnosis, and management of these injuries.
Main Methods:
- Review of mechanisms of common toxin-induced tubulointerstitial renal injury.
- Discussion of causes, clinical presentations, diagnosis, and management.
Main Results:
- Toxin-induced tubulointerstitial injury can manifest as reduced renal function or solute transport defects.
- Injury may be reversible with reduced exposure, but prolonged exposure can lead to irreversible damage.
Conclusions:
- Mechanisms of toxin-induced tubulointerstitial renal injury are complex, involving toxin properties and host factors.
- Prompt diagnosis and management are crucial for potentially reversible kidney injury.
- Further understanding of these mechanisms can improve patient outcomes and preventative strategies.
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